iTeh StandardsiTeh Standards
EURUSD
Your shopping cart is empty.
ASTM

ASTM G60-01(2013)

(Practice)

Standard Practice for Conducting Cyclic Humidity Exposures

Standard Practice for Conducting Cyclic Humidity Exposures

SIGNIFICANCE AND USE
3.1 The procedure described is used to observe the behavior of steels under exposure conditions that retard the formation of a protective type of rust. It is also used to evaluate seal coat on insulation.  
3.2 This practice should not be used to rank steels that form a protective type of rust under atmospheric exposure conditions.
SCOPE
1.1 This practice covers procedures for conducting cyclic humidity exposures with a corrosive dip.2 It sets forth the conditions required in cyclic humidity testing.  
1.2 This practice does not prescribe the type of exposure specimen or exposure periods nor the interpretation to be given to the results.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
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 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-2013
ICS
19.040 - Environmental testing
Technical Committee
G01 - Corrosion of Metals
Drafting Committee
G01.05 - Laboratory Corrosion Tests
Current Stage
Ref Project

Relations

Replaces
ASTM G60-01(2007) - Standard Practice for Conducting Cyclic Humidity Exposures
Effective Date
01-May-2013
Replaced By
ASTM G60-01(2018) - Standard Practice for Conducting Cyclic Humidity Exposures
Effective Date
01-Oct-2018
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
01-May-2013
Referred By
ASTM G198-17 - Standard Test Method for Determining the Relative Corrosion Performance of Driven Fasteners in Contact with Treated Wood
Effective Date
01-May-2013

Buy Standard

ASTM G60-01(2013) - Standard Practice for Conducting Cyclic Humidity ExposuresASTM G60-01(2013) - Standard Practice for Conducting Cyclic Humidity Exposures
PreviousNext
Standard
ASTM G60-01(2013) - Standard Practice for Conducting Cyclic Humidity Exposures
English language
3 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)


NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: G60 − 01 (Reapproved 2013)
Standard Practice for
Conducting Cyclic Humidity Exposures
This standard is issued under the fixed designation G60; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Apparatus
1.1 This practice covers procedures for conducting cyclic 4.1 The apparatus required for cyclic humidity exposures
humidity exposures with a corrosive dip. It sets forth the
consists of a test chamber, provisions for heating the chamber,
conditions required in cyclic humidity testing.
a humidifying tower, a drying train, a dip mechanism, provi-
sions for introducing and draining the solution, a supply of
1.2 This practice does not prescribe the type of exposure
compressed air, specimen supports, and necessary means of
specimen or exposure periods nor the interpretation to be given
control.
to the results.
4.2 The size and detailed construction of the apparatus are
1.3 The values stated in SI units are to be regarded as
optional, provided the conditions obtained meet the require-
standard. The values given in parentheses are for information
ments of this practice.
only.
1.4 This standard does not purport to address all of the 4.3 AschematicdiagramoftheapparatusisshowninFig.1.
safety concerns, if any, associated with its use. It is the
4.4 The apparatus should be capable of providing an 8-h
responsibility of the user of this standard to consult and
humidity cycle three times per day, as shown in Fig. 2, and a
establish appropriate safety and health practices and deter-
dip cycle once a day.
mine the applicability of regulatory limitations prior to use.
4.4.1 The cyclic variation of humidity can be obtained by
variation of the temperature of the water in the humidifying
2. Referenced Documents
tower. The temperature of the water is cycled thermostatically
2.1 ASTM Standards:
such that the relative humidity of air bubbling through the
D1193 Specification for Reagent Water
water at a minimum rate of 1 L⁄min (0.04 ft /min) will vary
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
between 100 and 50 % when the temperature of the air in the
sion Test Specimens
test chamber is brought to 52 6 1°C (125 6 2°F).
4.4.2 The range of relative humidity can be extended by
3. Significance and Use
adding a drying period to the humidity cycle described above.
The minimum relative humidity shall be ≤20 % and the
3.1 The procedure described is used to observe the behavior
maximum relative humidity shall be ≥95 % for each cycle.
of steels under exposure conditions that retard the formation of
a protective type of rust. It is also used to evaluate seal coat on 4.4.3 Drops of solution which accumulate on the ceiling or
cover of the chamber shall not be permitted to fall on the
insulation.
specimens being exposed.
3.2 This practice should not be used to rank steels that form
a protective type of rust under atmospheric exposure condi-
NOTE 1—Instruments to continuously record temperature and humidity
tions. are not mandatory, but these provide the most reliable and economical
way of recording such information. In the absence of such
instrumentation, temperature and humidity measurement shall be made, at
least twice a day, at the maximum and minimum humidity in a cycle.
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
4.5 Materials of Construction:
of Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory
Corrosion Tests. 4.5.1 The test chamber should be made of inert materials
CurrenteditionapprovedMay1,2013.PublishedJuly2013.Originallyapproved
suchasplastics,glass,ormetalslinedwithimperviousplastics,
in 1979. Last previous edition approved in 2007 as G60–01 (2007). DOI:
rubber or epoxy-type materials, or materials exhibiting equiva-
10.1520/G0060-01R13.
2 lent corrosion resistance. Material of construction shall be such
Opinsky, A. J., Thomson, R. F., and Boegehold, A. L., “A Cyclic Humidity
Accelerated Corrosion Test for Sheet Steel,” ASTM Bulletin, January 1953.
that it will not affect the corrosiveness of the exposure
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
atmosphere.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.5.2 Thedipsolutioncontainershouldnotbeaffectedbyor
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. cause contamination of the dip solution.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
G60 − 01 (2013)
FIG. 1 Main Parts of the Cyclic Humidity Corrosion Exposure Apparatus (Schematic)
FIG. 2 Humidity Cycle (Schematic)
4.6 Specimen Supports: liquid line, or the vapor phase. In a stacked rack, the first and
4.6.1 The specimen-supporting device should not be af- last specimens should be dummy specimens so that the
fected by or cause contamination of the dip solution. See Note outermost exposure specimens are shielded by their neighbors
2. in the same manner as specimens in the middle of the stack.
4.6.2 The method of supporting specimens will vary with
5. Reagents and Materials
the apparatus used for conducting the tests, but should be
designed to insulate the specimens from each other physically 5.1 Purity of Reagents—Reagent grade chemicals shall be
andelectricallyandtoinsulatethespecimensfromanymetallic
used in all tests. Unless otherwise indicated, it is intended that
container or supporting device used within the apparatus. The all reagents shall conform to the specifications of the Commit-
specimens shall not contact any material capable o
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

This May Also Interest You

ASTM
ASTM G217-16(2022)(Guide)
Standard Guide for Corrosion Monitoring in Laboratories and Plants with Coupled Multielectrode Array Sensor Method

SIGNIFICANCE AND USE
4.1 Guide G96 describes a linear-polarization method and an electrical resistance method for online monitoring of corrosion in plant equipment without the need to enter the system physically to withdraw coupons. These two online monitoring techniques are useful in systems in which process upsets or other problems can create corrosive conditions. An early warning of corrosive attack can permit remedial action before significant damage occurs to process equipment. The two methods described in Guide G96 are suitable for uniform corrosion, but may not be sensitive enough for non-uniform corrosion, especially localized corrosion. This guide describes a new method for monitoring non-uniform corrosion, especially localized corrosion.  
4.2 The CMAS technique measures the net anodic current or net cathodic current from each of the individual electrodes (Iaex or Icex in Fig. 1), which is the characteristic of non-uniform corrosion such as localized corrosion and uneven general corrosion. Therefore, the CMAS technique can be used to estimate the rate of uneven general corrosion and localized corrosion (see Section 5).
FIG. 1 Principle of CMAS Probe
Note 1: The upper section shows the electron flows from the corroding area to the less corroding areas inside a metal when localized corrosion takes place; the lower section shows the electron flows after the anodic and cathodic areas are separated into individual small electrodes and coupled through an external circuit that measures the anodic current (Iaex) and cathodic current (Icex) through each of the individual electrodes (4).  
4.3 Unlike uniform corrosion, the rate of non-uniform corrosion, especially localized corrosion, can vary significantly from one area to another area of the same metal exposed to the same environment. Allowance shall be made for such variations when the measured non-uniform corrosion rate is used to estimate the penetration of the actual metal structure or the actual wall of process equipment. T...
SCOPE
1.1 This guide outlines the procedure for conducting corrosion monitoring in laboratories and plants by use of the coupled multielectrode array sensor (CMAS) technique.  
1.2 For plant applications, this technique can be used to assess the instantaneous non-uniform corrosion rate, including localized corrosion rate, on a continuous basis, without removal of the monitoring probes, from the plant.  
1.3 For laboratory applications, this technique can be used to study the effects of various testing conditions and inhibitors on non-uniform corrosion, including pitting corrosion and crevice corrosion.  
1.4 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.  
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.

  • Guide
    11 pages
    English language
    sale 15% off
ASTM
ASTM G92-20(Practice)
Standard Practice for Characterization of Atmospheric Test Sites

SIGNIFICANCE AND USE
4.1 This practice gives suggested procedures for characterization of atmospheric test sites. It can be useful to researchers, manufacturers, engineering firms, architects, and construction contractors to provide corrosion and environmental data, materials selection information, and a materials storage practice.  
4.2 This practice does not give specific parameters for classifying the type of test site.
SCOPE
1.1 This practice covers procedures for the characterization of atmospheric test sites. Continuous characterization can provide corrosion data, environmental data, or both which will signal changes in corrosivity of the atmospheric environment. This practice can also provide guidance for classification of future test sites.  
1.2 Two methods are defined in this practice for the characterization of atmospheric test sites. The methods are identified as characterization Methods A and B. The preferred characterization technique would require using both Method A and B for concurrent data collection.  
1.2.1 Method A is to be used when atmospheric corrosion is monitored on a continuing basis at a test site using specified materials and exposure configurations.  
1.2.2 Method B is specified when atmospheric factors are monitored on a continuing basis.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.  
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.

  • Standard
    5 pages
    English language
    sale 15% off
  • Standard
    5 pages
    English language
    sale 15% off
ASTM
ASTM G60-01(2018)(Practice)
Standard Practice for Conducting Cyclic Humidity Exposures

SIGNIFICANCE AND USE
3.1 The procedure described is used to observe the behavior of steels under exposure conditions that retard the formation of a protective type of rust. It is also used to evaluate seal coat on insulation.  
3.2 This practice should not be used to rank steels that form a protective type of rust under atmospheric exposure conditions.
SCOPE
1.1 This practice covers procedures for conducting cyclic humidity exposures with a corrosive dip.2 It sets forth the conditions required in cyclic humidity testing.  
1.2 This practice does not prescribe the type of exposure specimen or exposure periods nor the interpretation to be given to the results.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
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 consult and 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.

  • Standard
    4 pages
    English language
    sale 15% off
ASTM
ASTM E2899-24(Test Method)
Standard Test Method for Measurement of Initiation Toughness in Surface Cracks Under Tension and Bending

SIGNIFICANCE AND USE
5.1 Surface cracks are among the most common defects found in structural components. An accurate characterization and understanding of crack-front behavior is necessary to ensure successful operation of a structure containing surface cracks. The testing of laboratory specimens with surface cracks provides a means to understand and quantify surface crack behavior, but the test results must be interpreted correctly to ensure transferability between the laboratory specimen and the structure.  
5.2 Transferability refers to the capacity of a fracture mechanics methodology to correlate the crack-tip stress and strain fields of different cracked bodies. Traditionally, the correlation has been based on the presence at fracture of a dominant, asymptotically singular, crack-tip field with amplitude set by the value of a single parameter, such as the stress intensity factor, KI, or the J-integral. For components and specimens with high crack-tip constraint, the singular crack-tip field dominates over microstructurally significant size scales for loads ranging from globally linear-elastic conditions to moderately large-scale plasticity. For specimens with low crack-tip constraint, a dominant single-parameter crack-tip field exists only at low levels of plasticity. At higher levels of plasticity, the opening mode stress of the low constraint specimen is lower than predicted by the single-parameter, asymptotically singular fields. Therefore, low constraint specimens often exhibit larger fracture toughness than do high constraint specimens. If feasible, users are strongly encouraged to generate high constraint fracture toughness data using methods such as Test Methods E399 or E1820 prior to testing the surface crack geometry.  
5.2.1 To address this phenomenon, two-parameter fracture criteria are used to include the influence of crack-tip constraint. Crack-tip constraint has been quantified using various scalar parameters including the T-stress (10, 11, 12), Q   (13, 14), stres...
SCOPE
1.1 This test method describes the method for testing fatigue-sharpened, semi-elliptically shaped surface cracks in rectangular flat panels subjected to monotonically increasing tension or bending. Tests quantify the crack-tip conditions at initiation of stable crack extension or immediate unstable crack extension.  
1.2 This test method applies to the testing of metallic materials not limited by strength, thickness, or toughness. Materials are assumed to be essentially homogeneous and free of residual stress. Tests may be conducted at any appropriate temperature. The effects of environmental factors and sustained or cyclic loads are not addressed in this test method.  
1.3 This test method describes all necessary details for the user to test for the initiation of crack extension in surface crack test specimens. Specific requirements and recommendations are provided for test equipment, instrumentation, test specimen design, and test procedures.  
1.4 Tests of surface cracked, laboratory-scale specimens as described in this test method may provide a more accurate understanding of full-scale structural performance in the presence of surface cracks. The provided recommendations help to assure test methods and data are applicable to the intended purpose.  
1.5 This test method prescribes a consistent methodology for test and analysis of surface cracks for research purposes and to assist in structural assessments. The methods described here utilize a constraint-based framework (1, 2)2 to evaluate the fracture behavior of surface cracks.
Note 1: Constraint-based framework. In the context of this test method, constraint is used as a descriptor of the three-dimensional stress and strain fields in the near vicinity of the crack tip, where material contractions due to the Poisson effect may be suppressed and therefore produce an elevated, tensile stress state (3, 4). (See further discussions in Terminology and Significance a...

  • Standard
    39 pages
    English language
    sale 15% off
  • Standard
    39 pages
    English language
    sale 15% off
ASTM
ASTM D6665-24(Practice)
Standard Practice for Evaluation of Aging Resistance of Pre-stressed Prepainted Metal in a Boiling Water Test

ABSTRACT
This practice establishes the standard procedures for evaluating the resistance of pre-stressed prepainted metal panels to cracking and loss of adhesion, or both, after accelerated aging by boiling water. This method shall require the use of boiling water bath, 10x magnifier, Scotch #610 adhesive tape or its equivalent, and deionized or other water as reagent.
SIGNIFICANCE AND USE
3.1 Prepainted metal is supplied as a painted coil, and it is fabricated into a finished part. The fabrication process induces stress to the paint system. To determine if this stress will lead to a failure in service, it is common to immerse the stressed sample in boiling water. If no failure occurs (see 7.4) after exposure to boiling water, it is very unlikely that a failure will occur in the field.
SCOPE
1.1 This practice can be used to evaluate the resistance of a pre-stressed prepainted metal panel to cracking and loss of adhesion, or both, after accelerated aging by boiling water. Most coil coated products are formed and bent into specific shapes to produce a final product. These operations introduce stresses, which may be relieved by cracking of the coating after aging.  
1.2 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.  
1.3 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.

  • Standard
    2 pages
    English language
    sale 15% off
  • Standard
    2 pages
    English language
    sale 15% off
ASTM
ASTM G201-23(Practice)
Standard Practice for Conducting Exposures in Outdoor Glass-Covered Exposure Apparatus with Air Circulation

SIGNIFICANCE AND USE
5.1 As with any accelerated test, the increase in rate of weathering compared to in-service exposure is material dependent. Results from exposures conducted to this practice may provide good rank correlation to results from actual use conditions for one type of material or product. It should not be assumed that this will be true for other materials or products. It is always best to verify the ability of an accelerated exposure test to properly rank the durability of materials with actual use conditions. Guide G141 provides information about using rank correlation.  
5.2 Variation in results may be expected when operating conditions are varied within the accepted limits of this practice. Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the specific operating conditions in conformance with Report Section 8.  
5.3 The durability of materials in outdoor use can be very different depending on the location of the exposure because of differences in solar radiation, moisture, heat, pollutants, and other factors. Therefore, it cannot be assumed that results from exposure in a single location will be useful for determining durability ranking of materials in a different location.  
5.4 It is recommended that at least one control material be exposed with each test. The control material should be of similar composition and construction and be chosen so that its failure modes are the same as that of the material being tested. It is preferable to use two control materials, one with relatively good durability, and one with relatively poor durability. If control materials are included as part of the test, they shall be used for the purpose of comparing the performance of the test materials relative to the controls.
SCOPE
1.1 This practice covers the basic principles and operating procedures for using outdoor glass-covered exposure apparatus with air circulation. This practice is limited to the procedures for obtaining, measuring and controlling conditions of exposure. A number of exposure procedures are listed in Appendix X1; however, this practice does not specify the exposure conditions best suited for the material to be tested.  
1.2 For direct weathering exposures, refer to Practice G7. For exposures behind glass without air circulation, refer to Practice G24.  
1.3 Test specimens are exposed to solar radiation filtered through glass under partially controlled environmental test conditions. Different glass types and operating parameters are described.  
1.4 Specimen preparation and evaluation of the results are covered in ASTM methods or specifications for specific materials. More specific information for determining the change in properties after exposure and reporting these results is described in Practices D5870, D2244 and Test Method D523.  
1.5 The values stated in SI units are to be regarded as 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.

  • Standard
    6 pages
    English language
    sale 15% off
  • Standard
    6 pages
    English language
    sale 15% off
ASTM
ASTM D6660-01(2023)(Test Method)
Standard Test Method for Freezing Point of Aqueous Ethylene Glycol Base Engine Coolants by Automatic Phase Transition Method

SIGNIFICANCE AND USE
5.1 The freezing point of an engine coolant indicates the coolant freeze protection.  
5.2 The freezing point of an engine coolant may be used to determine the approximate glycol content, provided the glycol type is known.  
5.3 Freezing point as measured by Test Method D1177 or approved alternative method is a requirement in Specifications D3306 and D6210.  
5.4 This test method provides results that are equivalent to Test Method D1177 and expresses results to the nearest 0.1 °C with improved reproducibility over Test Method D1177.  
5.5 This test method determines the freezing point in a shorter period of time than Test Method D1177.  
5.6 This test method removes most of the operator time and judgement required by Test Method D1177.
SCOPE
1.1 This test method covers the determination of the freezing point of an aqueous engine coolant solution.  
1.2 This test method is designed to cover ethylene glycol base coolants up to a maximum concentration of 60 % (v/v) in water; however, the ASTM interlaboratory study mentioned in 12.2 has only demonstrated the test method with samples having a concentration range of 40 % to 60 % (v/v) water.
Note 1: Where solutions of specific concentrations are to be tested, they shall be prepared from representative samples as directed in Practice D1176. Secondary phases separating on dilution need not be separated.
Note 2: The products may also be marketed in a ready-to-use form (prediluted).  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. Some specific hazards statements are given in 7.3.  
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.

  • Standard
    5 pages
    English language
    sale 15% off
ASTM
ASTM E698-23(Test Method)
Standard Test Method for Kinetic Parameters for Thermally Unstable Materials Using Differential Scanning Calorimetry and the Flynn/Wall/Ozawa Method

SIGNIFICANCE AND USE
5.1 The kinetic parameters combined with the general rate law and the reaction enthalpy can be used for the determination of thermal hazard using Practice E1231  (1).4
SCOPE
1.1 This test method covers the determination of the overall kinetic parameters for exothermic reactions using the Flynn/Wall/Ozawa method and differential scanning calorimetry.  
1.2 This technique is applicable to reactions whose behavior can be described by the Arrhenius equation and the general rate law.  
1.3 Limitations—There are cases where this technique is not applicable. Limitations may be indicated by curves departing from a straight line (see 11.2) or the isothermal aging test not closely agreeing with the results predicted by the calculated kinetic values. In particular, this test method is not applicable to reactions that are partially inhibited. The technique may not work with reactions that include simultaneous or consecutive reaction steps. This test method may not apply to materials that undergo phase transitions if the reaction rate is significant at the transition temperature.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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.

  • Standard
    9 pages
    English language
    sale 15% off
  • Standard
    9 pages
    English language
    sale 15% off
ASTM
ASTM G90-23(Practice)
Standard Practice for Performing Accelerated Outdoor Weathering of Materials Using Concentrated Natural Sunlight

SIGNIFICANCE AND USE
4.1 Results obtained from this practice can be used to compare the relative durability of materials subjected to the specific test cycle used. No accelerated test can be specified as a perfect simulation of natural or field exposures. Results obtained from this practice can be considered as representative of natural weathering only when a sufficient magnitude of mathematical correlation exists between exposures.  
4.2 The acceleration factor relating the rate of degradation in this accelerated exposure to the rate of degradation in a natural weathering exposure varies with the type and formulation of the material. Each material and formulation may respond differently to the increased level of irradiance and differences in temperature and humidity. Thus an acceleration factor determined for one material may not be applicable to other materials. For this reason, the use of a single acceleration factor is not recommended. Also, a different acceleration factor may be obtained by using different mirror types and configurations. Because of variability in test results for both accelerated and natural weathering exposures, results from a sufficient number of tests must be obtained to determine an acceleration factor for a material. Further, the acceleration factor is applicable to only one exposure location because results from natural weathering will vary due to seasonal or annual differences in climatic factors.  
4.3 The relative durability of materials determined by this practice can be used to determine the relative durability of the materials exposed under natural weathering conditions provided the materials have similar acceleration factors. However, even if results from a specific accelerated test condition are found to be useful for comparing the durability of materials exposed in a particular exterior location, it cannot be assumed that they will be useful for determining the relative durability for a different location. The relative durability of materials in n...
SCOPE
1.1 Linear Fresnel reflector concentrators using the sun as source are utilized in the accelerated outdoor exposure testing of materials.  
1.2 This practice covers a procedure for performing accelerated outdoor exposure testing of materials using a linear Fresnel reflector, accelerated outdoor weathering, test machine. The apparatus (see Fig. 1 and Fig. 2) and guidelines are described herein to minimize the variables encountered during outdoor accelerated exposure testing.    
1.3 This practice does not specify the exposure conditions best suited for the materials to be tested but is limited to the method of obtaining, measuring, and controlling the procedures and certain conditions of the exposure. Sample preparation, test conditions, and evaluation of results are covered in existing methods or specifications for specific materials.  
1.4 The linear Fresnel reflector accelerated outdoor exposure test apparatus described may be suitable for the determination of the relative durability of materials when these materials are exposed to concentrated sunlight, heat, and moisture.  
1.5 This practice establishes uniform sample mounting and in-test maintenance procedures. Also included in the practice are standard provisions for maintenance of the machine and linear Fresnel reflector mirrors to ensure cleanliness and durability.  
1.6 This practice shall apply to specimens whose size meets the dimensions of the target board as described in 8.2.  
1.7 For test machines currently in use, this practice is not recommended for specimens exceeding 13 mm (1/2 in.) in thickness because of specimen cooling.  
1.8 Values stated in SI units are to be regarded as the standard. The inch-pound units in parentheses are provided for information only.  
1.9 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...

  • Standard
    14 pages
    English language
    sale 15% off
  • Standard
    14 pages
    English language
    sale 15% off
ASTM
ASTM E324-23(Test Method)
Standard Test Method for Relative Initial and Final Melting Points and the Melting Range of Organic Chemicals

SIGNIFICANCE AND USE
5.1 It has long been recognized that narrow melting range and high final melting point are good indications of high purity in crystalline organic compounds. Several ASTM test methods use these criteria to assay the purity of organic compounds (Note 1).
Note 1: Other ASTM test methods using melting (or freezing point) data to indicate sample purity are Test Methods D852 and D6875.  
5.2 The relatively simple and rapid test prescribed in this test method shows the sample under test to be either more or less pure than the standard sample. For specification purposes, a minimum allowable purity can be assured by setting limits on the differences in final melting points and the melting ranges between the standard sample and the sample under test.
SCOPE
1.1 This test method covers the determination, by a capillary tube method, of the initial melting point and the final melting point, which define the melting range, of samples of organic chemicals whose melting points without decomposition fall between 30 °C and 250 °C.  
1.2 This test method is applicable only to crystalline materials that are sufficiently stable in storage to met the requirements of a satisfactory standard sample as defined in Section 7.  
1.3 This test method is not directly applicable to opaque materials or to noncrystalline materials such as waxes, fats, and fatty acids.  
1.4 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, handling, and safety precautions.  
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.  
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.

  • Standard
    4 pages
    English language
    sale 15% off
  • Standard
    4 pages
    English language
    sale 15% off