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ASTM E2922-15

(Guide)

Standard Guide for The Use of Standard Test Methods and Practices for Evaluating Antibacterial Activity on Textiles

Standard Guide for The Use of Standard Test Methods and Practices for Evaluating Antibacterial Activity on Textiles

SIGNIFICANCE AND USE
4.1 Antimicrobial agents are routinely used for treating textile materials for the reduction of biodeterioration and bacterial odor generation. Furthermore, textiles are treated to prevent or limit microbial cross-contamination in healthcare settings.  
4.2 Antimicrobial agents used in textiles will vary with regard to their broad-spectrum effectiveness, biostatic/biocidal properties, and binding properties in or on particular substrates. When selecting antibacterial test methods as the sole means to predict end use behavior it is critical to understand the intended end use conditions of the treated articles.  
4.3 Textile materials differ with regard to the knit/weave, fabric composition, and added functional feature (for example, water repellent, flame retardant, softener, whitener). Each of these factors may alter test results within a given method.  
4.4 The test methods indicated below differ mainly in the procedure for inoculating samples, levels of nutrients in the bacterial challenge, organisms used, and exposure times.  
4.5 This guide is intended to review each commonly used industry standard test method for its applicability with an understanding of each of the factors listed above. Further, it is the intention of this guide to indicate commonly used and generally accepted modifications of each method when measuring specific end-use functionalities.  
4.6 These test methods are not, in themselves, absolute indicators of real life performance. Such performance criteria are developed based on a series of antimicrobial and analytical test methods in addition to simulated real life use studies. All antimicrobial agents used for the treatment of textiles should be compliant with local regulatory agencies and should be deemed safe for the proposed end-use and claims.
SCOPE
1.1 This guide provides users with an index of procedures in the form of test methods, practices, and related international documents that are currently used in the textile industry for determining antibacterial properties of antimicrobial treated textile articles. This guide is not considered as all-inclusive for antimicrobial testing procedures related to textiles.  
1.2 This guide identifies some existing ASTM and other industry standard test methods applicable for testing the antibacterial performance on textiles and discusses options within each method that have been used to address specific end-use performance expectations.  
1.3 This guide is intended to assist testing facilities in determining which test methods are appropriate for which treated articles based on type of antimicrobial active involved (diffusible versus non-diffusible), nature of test fabric, and expected end use.  
1.4 The test methods indicated in this guide should be performed only by those trained in microbiological techniques, are familiar with textile antimicrobial agents and with the end use exposures of the antimicrobial treated textile material.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-2015
ICS
59.080.01 - Textiles in general
Technical Committee
E35 - Pesticides, Antimicrobials, and Alternative Control Agents
Drafting Committee
E35.15 - Antimicrobial Agents
Current Stage
Ref Project

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ASTM E2922-15 - Standard Guide for The Use of Standard Test Methods and Practices for Evaluating Antibacterial Activity on TextilesASTM E2922-15 - Standard Guide for The Use of Standard Test Methods and Practices for Evaluating Antibacterial Activity on Textiles
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ASTM E2922-15 - Standard Guide for The Use of Standard Test Methods and Practices for Evaluating Antibacterial Activity on Textiles
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E2922 − 15
Standard Guide for
The Use of Standard Test Methods and Practices for
1
Evaluating Antibacterial Activity on Textiles
This standard is issued under the fixed designation E2922; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E2180 Test Method for Determining the Activity of Incor-
porated Antimicrobial Agent(s) In Polymeric or Hydro-
1.1 This guide provides users with an index of procedures
phobic Materials
in the form of test methods, practices, and related international
E2722 Test Method for Using Seeded-Agar for the Screen-
documents that are currently used in the textile industry for
ing Assessment of Antimicrobial Activity in Fabric and
determining antibacterial properties of antimicrobial treated
Air Filter Media
textile articles. This guide is not considered as all-inclusive for
E2756 Terminology Relating to Antimicrobial and Antiviral
antimicrobial testing procedures related to textiles.
Agents
1.2 This guide identifies some existing ASTM and other
3
2.2 AATCC Standards:
industry standard test methods applicable for testing the
AATCC Test Method 90: Antibacterial Activity Assessment
antibacterial performance on textiles and discusses options
of Textile Materials: Agar Plate Method. American Asso-
within each method that have been used to address specific
ciation of Textile Chemists and Colorists, RTP, NC
end-use performance expectations.
AATCC Test Method 100: Antibacterial Finishes on Fabrics,
1.3 This guide is intended to assist testing facilities in
Evaluation of. American Association of Textile Chemists
determining which test methods are appropriate for which
and Colorists, RTP, NC
treated articles based on type of antimicrobial active involved
AATCC Test Method 147: Antibacterial Activity Assess-
(diffusible versus non-diffusible), nature of test fabric, and
ment of Textile Materials: Parallel Streak Method. Ameri-
expected end use.
can Association of Textile Chemists and Colorists, RTP,
NC
1.4 The test methods indicated in this guide should be
4
performed only by those trained in microbiological techniques,
2.3 ISO Standards:
are familiar with textile antimicrobial agents and with the end
ISO 20743 Textiles – Determination of Antibacterial Activ-
use exposures of the antimicrobial treated textile material.
ity of Antibacterial Finished Products
ISO 22196 Plastics – Measurement of Antibacterial Activity
1.5 This standard does not purport to address all of the
on Plastics Surfaces
safety concerns, if any, associated with its use. It is the
5
responsibility of the user of this standard to establish appro-
2.4 JIS Standards:
priate safety and health practices and determine the applica- JIS L 1902 Testing for Antibacterial Activity and Efficacy on
bility of regulatory limitations prior to use.
Textile Products
JIS Z 2801 Antimicrobial Products – Test for Antimicrobial
2. Referenced Documents
Activity and Efficacy
2
2.1 ASTM Standards:
2.5 Other Standards:
E2149 Test Method for Determining the Antimicrobial Ac-
SNV 195920 Examination of the Antimicrobial Effect of
4
tivity of Antimicrobial Agents Under Dynamic Contact
Impregnated Textiles by the Agar Diffusion Test
Conditions
IBRG TEX13/005/1.0 Quantitative Method for Evaluating
Bactericidal Activity of Textiles and Porous Materials and
Articles
1
This guide is under the jurisdiction of ASTM Committee E35 on Pesticides,
Antimicrobials, and Alternative Control Agents and is the direct responsibility of
Subcommittee E35.15 on Antimicrobial Agents.
3
Current edition approved May 1, 2015. Published June 2015. DOI: 10.1520/ Available from AATCC 1 Davis Dr Research Triangle Park, NC 27709-2215
E2922–15 USA. http://www.aatcc.org/
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from International Organization for Standardization (ISO), 1, ch. de
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org.
5
Standards volume information, refer to the standard’s Document Summary page on Available from Japanese Industrial Standards Committee (JIS) 1-3-1
the ASTM website. Kasumigaseki, Chiyoda-ku, Tokyo 100-8901, JAPAN. http://www.jisc.go.jp
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E2922 − 15
3. Terminology activity if multiple organisms are used. In many cases, four
organisms are streaked lengthwise per agar plate (Escherichia
3.1 For definitions of terms used
...

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ASTM E2922-23(Guide)
Standard Guide for Use of Standard Test Methods and Practices for Evaluating Antibacterial Activity on Textiles

SIGNIFICANCE AND USE
4.1 Antimicrobial agents are routinely used for treating textile materials for the reduction of biodeterioration and bacterial odor generation. Furthermore, textiles are treated to prevent or limit microbial cross-contamination in healthcare settings.  
4.2 Antimicrobial agents used in textiles will vary with regard to their broad-spectrum effectiveness, biostatic/biocidal properties, and binding properties in or on particular substrates. When selecting antibacterial test methods as the sole means to predict end use behavior it is critical to understand the intended end use conditions of the treated articles.  
4.3 Textile materials differ with regard to the knit/weave, fabric composition, and added functional feature (for example, water repellent, flame retardant, softener, whitener). Each of these factors may alter test results within a given method.  
4.4 The test methods indicated below differ mainly in the procedure for inoculating samples, levels of nutrients in the bacterial challenge, organisms used, exposure times, and procedure for sterilization of test samples. Each of these parameters are often subject to industry modifications.  
4.5 Some antimicrobial treated articles are not suitable for sterilization due to the sensitivity of these antimicrobial agents to high temperature and humidity. Furthermore, some antimicrobial agents may be unrealistically activated due to UV sterilization which could show false positive antimicrobial properties. Sterilization of test fabrics prior to testing should be avoided if possible. All modifications of the methods indicated below should be clearly indicated on associated test reports and should be appropriate to the antimicrobial technology used.  
4.6 This guide is intended to review each commonly used industry test standard for its applicability with an understanding of each of the factors listed above. Further, it is the intention of this guide to indicate commonly used and generally accepted modifications of e...
SCOPE
1.1 This guide provides users with an index of procedures in the form of test methods, practices, and related international documents that are currently used in the textile industry for determining antibacterial properties of antimicrobial treated textile articles. This guide is not considered as all-inclusive for antimicrobial testing procedures related to textiles.  
1.2 This guide identifies some existing ASTM and other industry standard test methods applicable for testing the antibacterial performance on textiles and discusses options within each method that have been used to address specific end-use performance expectations in addition to measuring wash durability of such activity.  
1.3 This guide is intended to assist testing facilities in determining which test methods are appropriate for which treated articles based on type of antimicrobial active involved (diffusible versus non-diffusible), nature of test fabric, and expected end use.  
1.4 The test methods indicated in this guide should be performed only by those trained in microbiological techniques, are familiar with textile antimicrobial agents and with the end use exposures of the antimicrobial treated textile material.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM E3160-18(Test Method)
Standard Test Method for Quantitative Evaluation of the Antibacterial Properties of Porous Antibacterial Treated Articles

SIGNIFICANCE AND USE
5.1 Porous articles (often textiles) are often treated with antimicrobial agents to reduce the growth of microorganisms during use, in storage, or while waiting to be laundered, or both. Additionally, antimicrobial agents are added to reduce or control the overall microbial growth on porous articles that may affect the material’s odor, visual, chemical or physical integrity, or both.  
5.2 Antimicrobial textile test methods that measure the antimicrobial behavior of treated textiles do exist but they are often specific for one type of antimicrobial agent or are designed to or may artificially (not expected in real life) promote the release of some specific antibacterial agents over others. This test method is designed to be able to measure the antimicrobial activity from all common antimicrobial agents used to treat porous articles, including textiles, without giving either positive or negative bias to one type of chemistry or product over another.  
5.3 In an effort to avoid excessive use or abuse of antimicrobial agents in the environment, it is important to understand if untreated porous articles are susceptible to microbial contamination and growth. In this test method, a small amount of nutrients is added to each test sample in order to promote some microbial growth on susceptible test samples but not enough to overwhelm potential antimicrobial agents that may be effective in real life situations. Furthermore, low levels of nutrients allow investigators to add soiling agents that may be more reflective of a specific treated product’s end use or expected performance.  
5.4 Very specific parameters are identified within this method to limit any variability that may be seen between laboratories. Identifying and clarifying potential variables found in other guides or methods used in the industry will allow for better reproducibility and repeatability between and within laboratories.  
5.5 This test method provides the foundation for conducting tests on porous a...
SCOPE
1.1 To determine the bactericidal or bacteriostatic properties of porous articles treated with an active biocidal agent, samples of porous treated materials, such as textiles or paper, are inoculated with a defined suspension of microorganisms and then incubated. The changes in numbers of the bacterial populations on the treated article are compared with untreated articles either over designated time or they are compared to the initial bacterial population at “zero time” for the treated article to measure antibacterial properties.  
1.2 This test method is used for measuring the quantitative antibacterial activity of porous materials that have been treated with a biocide to inhibit the growth of bacteria on the treated materials. This method may also be used to measure the ability of the treated material to inhibit the growth of a microorganism. It can measure both bactericidal and bacteriostatic activity.  
1.3 This test method shall be performed by individuals experienced and adept in microbiological procedures and in facilities suitable for the handling of the microorganisms under test.  
1.4 This test method may involve hazardous materials, operations, and equipment.  This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM E3162-18(Practice)
Standard Practice Measuring the Durability of Antibacterial Agents Applied to Textiles under Simulated Home Laundering Conditions

SIGNIFICANCE AND USE
5.1 The durability of antimicrobial agents applied to textiles is an important attribute for many of the available technologies on the market. Antimicrobial agents that claim durability are typically fixed ionically, covalently or physically, or both, to a textile surface and are expected to retain their antimicrobial functionality after 5, 25 or 50 washes.  
5.2 Textile wash standards do exist that measure features as diverse as colorfastness or softener retention, pilling, or even the appearance of the decorative coatings of a zipper; however, no wash method exists that is specific for measuring the durability of an antimicrobial agent applied directly into or onto a textile surface.  
5.3 Current wash standards have been written to either closely simulate (AATCC TM135) or accelerate (AATCC TM61) the laundering conditions that would be experienced during normal home laundering. While shown to be effective when testing physical properties of textiles, these methods introduce variables to the washing protocol that can directly affect the final antimicrobial properties of a fabric. For example, many wash protocols add bleach or softeners which can build up over time and may introduce false positive results in industry standard microbiological tests. Conversely, powdered detergents if not completely rinsed after each wash can leave residual surfactants that can build up over time but are generally removed during wear. These residual detergents can potentially coat an antimicrobial surface and provide false negative results.  
5.4 Very specific parameters are identified within this practice to closely replicate home launderings as identified and studied in previous wash protocols (AATCC TM61) and accepted within the textile industry. This practice uses detergents and washing conditions which limit potential cross contamination of samples during washing and unrealistic deposition of residual detergents on the test fabric. These conditions increase the reproducibility...
SCOPE
1.1 To determine the durability of standard antibacterial treatments on textile products such as apparel, piece goods, household articles, hereinafter referred to as “textile” or “textile products” to multiple home launderings.  
1.2 This practice subjects textile products treated with antimicrobial agents to multiple simulated and accelerated home launderings under defined parameters such that reproducible and reliable antimicrobial analysis can be performed using standard industry accepted protocols.  
1.3 For some antimicrobial agents, the durability of antibacterial properties resulting from exposure to detergent solution and abrasive action of multiple home launderings has been shown to be approximated by one 45-minute laundering cycle. The exact correlation between expressed laundry care instructions and exposure conditions identified in the practice should be determined separately for every antimicrobial agent.  
1.4 The subsequent microbiological methods shall be performed by individuals experienced and adept in microbiological procedures and in facilities suitable for the handling of the microorganisms under test.  
1.5 This standard may involve hazardous materials, operation, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM D6419-00(2023)(Test Method)
Standard Test Method for Volatile Content of Sheet-Fed and Coldset Web Offset Printing Inks

SIGNIFICANCE AND USE
4.1 This test method is the procedure of choice for determining volatile content of sheet-fed and coldset web offset inks. This information is useful to the ink manufacturer and user and to environmental interests as part of the determination of the mass of volatile organic compounds emitted from the ink.
Note 3: Since these inks do not contain water or any materials currently classified by US EPA as negligibly photochemically reactive (exempt solvents), volatile organic compound content is the same as volatile content. The volatile organic compounds in these inks are high boiling hydrocarbon oils which are, according to US EPA guidelines, 95 % retained in the printed substrate or oxidized into the ink film. Therefore, the mass of volatile organic compound emitted from the ink would be calculated as only 5 % of the volatile organic compound content of the ink as derived from the results of this test method.
SCOPE
1.1 This test method describes a procedure for determination of the weight percent volatile content of sheet-fed and coldset web offset printing inks. Test specimens are heated at 110 °C ± 1 °C for 60 min.
Note 1: Coldset web offset printing is often (also) referred to as non-heatset web offset printing.  
1.2 This test method is also applicable to sheet-fed and coldset web offset printing ink vehicles.
Note 2: Vehicle is the liquid portion of the printing ink. Any substance that is dissolved in the liquid portion of the ink is a part of the vehicle.  
1.3 This test method is not applicable to ultra-violet (UV) or electron beam cured materials, which must be cured by exposure to UV light or an electron beam as part of the test for volatile content.  
1.4 This test method is based on Test Method D2369, in which the allowable ranges are ±0.1 g for specimen weight and ±5 °C for oven temperature. Interlaboratory studies have shown that specimen weight and oven temperature must both be more tightly controlled in order to improve the precision of test results for sheet-fed and coldset web-offset inks. Such inks typically contain a wide range of high-boiling hydrocarbons and often have a volatile content below 25 %.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement see 7.5.1  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM D123-23(Terminology)
Standard Terminology Relating to Textiles

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1.1 This standard is the compilation of all terminology developed by Committee D13 on Textiles.  
1.1.1 This terminology, consists mostly of definitions, which are specific to the textile industry. Meanings of the same terms used outside the textile industry can be found in other compilations or in dictionaries of general usage.  
1.1.2 The specific D13 subcommittee (SC) which has jurisdictional responsibility for every item is the first attribution noted after the definition. The SC terminology standard in which all the terms and definitions appear is listed by number after the jurisdiction for the term. The wording of an entry cannot be changed without the approval of the subcommittee which has jurisdiction. Users of this compilation should also review the SC terminology standard listed for more details or interpretations of these terms and their use by the SC having jurisdiction.  
1.2 In addition to being a specialized dictionary, Terminology D123 is also a tool for managing the committee's terminology. This includes finding, eliminating, and preventing redundancies, that is, where two or more terms relating the same concept are defined in different words. Redundancies can also occur when one definition is used for two or more terms.  
1.3 While the review for clarity and form are the responsibility of the terminology subcommittee, the concept of managing terminology is the broad responsibility of every writer of standards, specifically the task group leader and subcommittee chairman.  
1.4 Subsequent to a listing of specific subcommittee compilations, this standard is comprised of the following sections that are listed in the order in which they appear.  
1.4.1 Alphabetical listing of terms with definitions followed by SC attribution in brackets and SC terminology standard.  
1.4.2 Annex A1 Terms Relating to the Hand of Fabrics.  
1.4.3 Annex A2 Industry Accepted Synonyms.  
1.4.4 Annex A3 Terminology Taken From D13 Standards That Have Been Withdrawn.  
1.4.5 Annex A4 Terminology Relating to Leather.  
1.4.6 Annex A5 Terminology Revision Procedures.  
1.4.7 Appendix X1 Other Sources of Textile Terminology.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM E2922-23(Guide)
Standard Guide for Use of Standard Test Methods and Practices for Evaluating Antibacterial Activity on Textiles

SIGNIFICANCE AND USE
4.1 Antimicrobial agents are routinely used for treating textile materials for the reduction of biodeterioration and bacterial odor generation. Furthermore, textiles are treated to prevent or limit microbial cross-contamination in healthcare settings.  
4.2 Antimicrobial agents used in textiles will vary with regard to their broad-spectrum effectiveness, biostatic/biocidal properties, and binding properties in or on particular substrates. When selecting antibacterial test methods as the sole means to predict end use behavior it is critical to understand the intended end use conditions of the treated articles.  
4.3 Textile materials differ with regard to the knit/weave, fabric composition, and added functional feature (for example, water repellent, flame retardant, softener, whitener). Each of these factors may alter test results within a given method.  
4.4 The test methods indicated below differ mainly in the procedure for inoculating samples, levels of nutrients in the bacterial challenge, organisms used, exposure times, and procedure for sterilization of test samples. Each of these parameters are often subject to industry modifications.  
4.5 Some antimicrobial treated articles are not suitable for sterilization due to the sensitivity of these antimicrobial agents to high temperature and humidity. Furthermore, some antimicrobial agents may be unrealistically activated due to UV sterilization which could show false positive antimicrobial properties. Sterilization of test fabrics prior to testing should be avoided if possible. All modifications of the methods indicated below should be clearly indicated on associated test reports and should be appropriate to the antimicrobial technology used.  
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SCOPE
1.1 This guide provides users with an index of procedures in the form of test methods, practices, and related international documents that are currently used in the textile industry for determining antibacterial properties of antimicrobial treated textile articles. This guide is not considered as all-inclusive for antimicrobial testing procedures related to textiles.  
1.2 This guide identifies some existing ASTM and other industry standard test methods applicable for testing the antibacterial performance on textiles and discusses options within each method that have been used to address specific end-use performance expectations in addition to measuring wash durability of such activity.  
1.3 This guide is intended to assist testing facilities in determining which test methods are appropriate for which treated articles based on type of antimicrobial active involved (diffusible versus non-diffusible), nature of test fabric, and expected end use.  
1.4 The test methods indicated in this guide should be performed only by those trained in microbiological techniques, are familiar with textile antimicrobial agents and with the end use exposures of the antimicrobial treated textile material.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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Standard Guide for Tiered Approach to Detection and Characterization of Silver Nanomaterials in Textiles

SIGNIFICANCE AND USE
4.1 Natural and manufactured textiles fibers can be treated with chemicals to provide enhanced antimicrobial (fungi, bacteria, viruses) properties. In some cases, silver nanomaterials may be used to treat textile fibers (1).6 Silver nanomaterials are used to treat a wide array of consumer textile products, including, but not limited to, various clothing; primary garments (shirts, pants), outer wear (gloves, jackets), inner wear (socks and underwear), children’s clothing (sleepwear); children’s plush toys; bath towels and bedding (sheets, pillows); and medical devices (for example, wound dressings and face masks) (2).  
4.2 There are many different chemical and physical forms of silver that are used to treat textiles and an overview of this topic is provided in Appendix X1.  
4.3 Several applicable techniques for detection and characterization of silver are listed and described in Appendix X2 so that users of this guide may understand the suitability of a particular technique for their specific textile and silver measurement need.  
4.4 There are many different reasons to assay for silver nanomaterials in a textile at any point in a product’s life cycle. For example, a producer may want to verify that a textile meets their internal quality control specifications or a regulator may want to understand the properties of silver nanomaterials used to make a consumer textile product under their jurisdiction or what quantity of silver nanomaterial is potentially available for release from the treated textile during the washing process or during product use. Regardless of the specific reason, a structured approach to detect and characterize silver nanomaterials present in a textile will facilitate measurements and data comparison. Detection and characterterization of silver in textiles is one component of an overall risk assessment.  
4.5 The approach presented in this guide (see Fig. 1) consists of three sequential tiers: obtain a textile sample (Section 7), detection o...
SCOPE
1.1 This guide covers the use of a tiered approach for detection and characterization of silver nanomaterials in consumer textile products, which can include some medical devices (for example, wound dressings or face masks), made of any combination of natural or manufactured fibers.  
1.2 This guide covers, but is not limited to, fabrics and parts (for example, thread, batting) used during the manufacture of textiles and production of consumer textile products that may contain silver-based nanomaterials. It does not apply to analysis of silver nanomaterials in non-consumer textile product matrices nor does it cover thin film silver coatings with only one dimension in the nanoscale.  
1.3 This guide is intended to serve as a resource for manufacturers, producers, analysts, policymakers, regulators, and others with an interest in textiles.  
1.4 This guide is presented in the specific context of measurement of silver nanomaterials; however, the structured approach described herein is applicable to other nanomaterials in consumer textile products, including some medical devices.  
1.5 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM D6773-22(Test Method)
Standard Test Method for Bulk Solids Using Schulze Ring Shear Tester

SIGNIFICANCE AND USE
5.1 Reliable, controlled flow of bulk solids from bins and hoppers is essential in almost every industrial facility. Unfortunately, flow stoppages due to arching and ratholing are common. Additional problems include uncontrolled flow (flooding) of powders, segregation of particle mixtures, usable capacity which is significantly less than design capacity, caking and spoilage of bulk solids in stagnant zones, and structural failures.  
5.2 By measuring the flow properties of bulk solids, and designing bins and hoppers based on these flow properties, most flow problems can be prevented or eliminated (1).3  
5.3 For bulk solids with a significant percentage of particles (typically, one third or more) finer than about 6 mm (1/4 in.), the unconfined yield strength is governed by the fines (−6 mm fraction). For such bulk solids, strength and wall friction tests may be performed on the fine fraction only.
Note 1: The quality of the result produced by this standard is dependent on the competence of personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself ensure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors. Practice D3740 was developed for agencies engaged in the testing or inspection (or both) of soil and rock. As such it is not totally applicable to agencies performing this standard. However, users of this standard should recognize that the framework of Practice D3740 is appropriate for evaluating the quality of an agency performing this standard. Currently there is no known qualifying national authority that inspects agencies that perform this standard.
SCOPE
1.1 This test method covers the apparatus and procedures for measuring the unconfined yield strength of bulk solids during both continuous flow and after storage at rest. In addition, measurements of internal friction, bulk density, and wall friction on various wall surfaces are included.  
1.2 This test method covers operation of the manually-controlled Schulze Ring Shear Tester. An automated version of this tester is also available. Its method of testing bulk solids is similar in principle to that described in this test method.  
1.3 The most common use of this information is in the design of storage bins and hoppers to prevent flow stoppages due to arching and ratholing, including the slope and smoothness of hopper walls to provide mass flow. Parameters for structural design of such equipment may also be derived from this data. Another application is the measurement of the flowability of bulk solids, for example, for comparison of different products or optimization.  
1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.  
1.4.1 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives: and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design.  
1.5 Units—The values stated in SI units are to be regarded as standard. No other units of measure are included in this standard.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the respons...

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ASTM
ASTM D5591-22(Test Method)
Standard Test Method for Thermal Shrinkage Force of Yarn and Cord With a Thermal Shrinkage Force Tester

SIGNIFICANCE AND USE
5.1 This test method may be used for the acceptance testing of commercial shipments of yarns and cords.  
5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, test samples should be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing. Other materials with established test values may be used for this purpose. The test results from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.  
5.2 Experience shows that yarns or cords on would packages, usually being under tension, exhibit a contraction in length (and a resulting increase in linear density) when removed from the package and allowed to relax over a period of time at room temperature. Consequently, it they are tested without being allowed to relax, they will register higher thermal shrinkage force values as the relaxation shrinkage will be incorrectly included as the thermal shrinkage force.  
5.2.1 Retractive forces vary widely by polymer type, being almost nil within aramids and significant within most nylons. For example, the exposure of untensioned skeins of nylon yarn or cord to 95 to 100 % relative humidity at room temperature for two days and reconditioning under standard laboratory conditions will cause most of the length change that is possible at room temperature to occur within a sample. This reduction in length is accompanied by some lowering of thermal shrinkage force.  
5.3 The thermal...
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1.1 This test method covers preparation and procedures to measure the thermal shrinkage force of yarns and cords in air.  
1.2 This test method is applicable to measurement of the thermal shrinkage force of yarns and cords whose shrinkage force at 180 ± 2 °C (355 ± 4 °F) in air does not exceed 20 N (4 lbf). This test method is applicable to nylon, polyester, and aramid yarns and cords within the applicable range of thermal shrinkage force, as well as to comparable yarns and cords from other polymers.  
1.2.1 Test specimens may be taken from yarn or cord packages, or retrieved from fabrics.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 8.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM G24-21(Practice)
Standard Practice for Conducting Exposures to Daylight Filtered Through Glass

SIGNIFICANCE AND USE
4.1 Since solar radiation, air temperature, relative humidity, and the amount and kind of atmospheric contaminants vary continuously, results from exposures based on elapsed time will sometimes differ. The variations in the results will usually be reduced by timing the exposures in terms of:  
4.1.1 One or more environmental parameters such as solar radiant exposure, or  
4.1.2 A predefined property change of a weathering reference specimen with known performance.  
4.2 Variations in temperature, moisture, and atmospheric contaminants can have a significant effect on the degradation caused by solar radiation. In addition, exposures conducted at different times of the year can cause large differences in the rate of degradation. Different materials generally have different sensitivities to heat, moisture, and atmospheric contaminants, and this could explain differences in rankings of specimens exposed to equivalent solar radiant exposure when other environmental conditions vary.  
4.3 Since the method of mounting has an influence on the temperature and other parameters during exposure of the specimen, there shall be agreement between contractual parties as to the method of mounting the specimen for the particular exposure test under consideration.  
4.4 There are differences among various single strength window glasses in their transmittance in the 300 to 350 nm region. For example, at 320 nm, the percent transmittance for seven different lots of single strength window glass ranged from 8.4 to 26.8 %. At 380 nm, the percent transmittance ranged from 84.9 % to 88.1 %.5  
4.5 Differences in UV transmittance between different lots of glass generally continue even after solarization. The largest differences among window glasses in UV transmittance are in the spectral range of 300 to 320 nm.  
4.6 This practice is best used to compare the relative performance of materials tested at the same time behind the same lot of glass. Because of variability between lots of g...
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1.1 This practice describes procedures for conducting exposures of various materials to daylight filtered through glass in passively ventilated and non-vented enclosures. For exposures in under glass enclosures with forced air circulation, refer to Practice G201.  
1.1.1 This practice is not intended for corrosion testing of bare metals.  
1.2 For direct exposures, refer to Practice G7.  
1.3 This practice is limited to the method of conducting the exposures. The preparation of test specimens and evaluation of results are covered in various standards for the specific materials.  
1.4 Exposure conducted according to this practice can use two types of exposure cabinets.  
1.4.1 Type A—A cabinet that allows passive ventilation of specimens being exposed behind glass.  
1.4.2 Type B—Enclosed cabinet with exterior painted black that does not provide for ventilation of specimens exposed behind glass. Exposures conducted using a Type B cabinet are typically referred to as “black box under glass exposures.”  
1.5 Type A exposures of this practice are technically similar to Method B of ISO 877-2.  
1.6 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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