ASTM G21-96

Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi

SCOPE
1.1 This practice covers determination of the effect of fungi on the properties of synthetic polymeric materials in the form of molded and fabricated articles, tubes, rods, sheets, and film materials. Changes in optical, mechanical, and electrical properties may be determined by the applicable ASTM methods.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.
1.3 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: 09-Jun-1996
• Technical Committee: G03 - Weathering and Durability
• Drafting Committee: G03.04 - Biological Deterioration

Relations

• Replaced By: ASTM G21-96(2002) - Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi
• Effective Date: 10-Jun-1996
• Referred By: ASTM E1925-18 - Specification for Engineering and Design Criteria for Rigid Wall Relocatable Structures
• Effective Date: 10-Jun-1996
• Referred By: ASTM G22-23 - Standard Practice for Determining Resistance of Plastics to Bacteria
• Effective Date: 10-Jun-1996
• Referred By: ASTM F793/F793M-20 - Standard Classification of Wall Coverings by Use Characteristics
• Effective Date: 10-Jun-1996
• Referred By: ASTM E2180-18 - Standard Test Method for Determining the Activity of Incorporated Antimicrobial Agent(s) In Polymeric or Hydrophobic Materials
• Effective Date: 10-Jun-1996
• Referred By: ASTM E3152-23 - Standard Guide for Standard Test Methods and Practices Available for Determining Antifungal Activity on Natural or Synthetic Substrates Treated with Antimicrobial Agents
• Effective Date: 10-Jun-1996
• Referred By: ASTM C318/C318M-13(2018) - Standard Specification for Gypsum Formboard
• Effective Date: 10-Jun-1996
• Referred By: ASTM E1514-98(2017)e1 - Standard Specification for Structural Standing Seam Steel Roof Panel Systems
• Effective Date: 10-Jun-1996
• Referred By: ASTM D6754/D6754M-23 - Standard Specification for Ketone Ethylene Ester Based Sheet Roofing
• Effective Date: 10-Jun-1996
• Referred By: ASTM E1637-98(2017)e1 - Standard Specification for Structural Standing Seam Aluminum Roof Panel Systems
• Effective Date: 10-Jun-1996
• Referred By: ASTM D6947/D6947M-16(2023) - Standard Specification for Liquid Applied Moisture Cured Polyurethane Coating Used in Spray Polyurethane Foam Roofing System
• Effective Date: 10-Jun-1996
• Referred By: ASTM C1894-22 - Standard Guide for Microbially Induced Corrosion of Concrete Products
• Effective Date: 10-Jun-1996
• Referred By: ASTM D4300-23 - Standard Test Methods for Ability of Adhesive Films to Support or Resist the Growth of Fungi
• Effective Date: 10-Jun-1996
• Referred By: ASTM C1705/C1705M-09(2023) - Standard Specification for Structural Cementitious Panels
• Effective Date: 10-Jun-1996
• Referred By: ASTM C1071-19 - Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound Absorbing Material)
• Effective Date: 10-Jun-1996

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: G 21 – 96
Standard Practice for
Determining Resistance of Synthetic Polymeric Materials to
1
Fungi
This standard is issued under the fixed designation G 21; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 1708 Test Method for Tensile Properties of Plastics by
3
Use of Microtensile Specimens
1.1 This practice covers determination of the effect of fungi
E 96 Test Methods for Water Vapor Transmission of Mate-
on the properties of synthetic polymeric materials in the form
4
rials
of molded and fabricated articles, tubes, rods, sheets, and film
E 308 Practice for Computing the Colors of Objects by
materials. Changes in optical, mechanical, and electrical prop-
5
Using the CIE System
erties may be determined by the applicable ASTM methods.
2.2 TAPPI Standard:
1.2 The values stated in SI units are to be regarded as the
6
Test Method T 451-CM-484 Flexural Properties of Paper
standard. The inch-pound units given in parentheses are for
2.3 Federal Standards:
information only.
FED STD 191 Method 5204 Stiffness of Cloth, Directional;
1.3 This standard does not purport to address all of the
7
Self Weighted Cantilever Method
safety concerns, if any, associated with its use. It is the
FED STD 191 Method 5206 Stiffness of Cloth Drape and
responsibility of the user of this standard to establish appro-
7
Flex; Cantilever Bending Method
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
3. Summary of Practice
2. Referenced Documents 3.1 The procedure described in this practice consists of
selection of suitable specimens for determination of pertinent
2.1 ASTM Standards:
properties, inoculation of the specimens with suitable organ-
D 149 Test Method for Dielectric Breakdown Voltage and
isms, exposure of inoculated specimens under conditions
Dielectric Strength of Electrical Insulating Materials at
2
favorable to growth, examination and rating for visual growth,
Commercial Power Frequencies
and removal of the specimens and observations for testing,
D 150 Test Methods for A-C Loss Characteristics and
either before cleaning or after cleaning and reconditioning.
Permittivity (Dielectric Constant) of Solid Electrical Insu-
2
lating Materials
NOTE 1—Since the procedure involves handling and working with
D 257 Test Methods for D-C Resistance or Conductance of
fungi, it is recommended that personnel trained in microbiology perform
2
the portion of the procedure involving handling of organisms and
Insulating Materials
inoculated specimens.
D 495 Test Method for High-Voltage, Low-Current, Dry
2
Arc Resistance of Solid Electrical Insulation
4. Significance and Use
3
D 618 Practice for Conditioning Plastics for Testing
3 4.1 The synthetic polymer portion of these materials is
D 638 Test Method for Tensile Properties of Plastics
usually fungus-resistant in that it does not serve as a carbon
D 747 Test Method for Apparent Bending Modulus of
3 source for the growth of fungi. It is generally the other
Plastics by Means of a Cantilever Beam
components, such as plasticizers, cellulosics, lubricants, stabi-
D 785 Test Method for Rockwell Hardness of Plastics and
3 lizers, and colorants, that are responsible for fungus attack on
Electrical Insulating Materials
plastic materials. It is important to establish the resistance to
D 1003 Test Method for Haze and Luminous Transmittance
3 microbial attack under conditions favorable for such attack,
of Transparent Plastics
namely, a temperature of 2 to 38°C (35 to 100°F) and a relative
humidity of 60 to 100 %.
1
This practice is under the jurisdiction of ASTM Committee G-3 on Durability
of Nonmetallic Materialsand is the direct responsibility of Subcommittee G03.04on
4
Biological Deterioration. Annual Book of ASTM Standards, Vol 04.06.
5
Current edition approved June 10, 1996. Published September 1996. Originally Annual Book of ASTM Standards, Vol 06.01.
6
published as D 1924 – 61. Last previous edition D 1924 – 90. Redesignated G 21 in Available from Technical Association of the Pulp and Paper Industry, Technol-
1970 (Reapproved 1990). ogy Park/Atlanta, P.O. Box 105113, Atlanta, GA 30348.
2 7
Annual Book of ASTM Standards, Vol 10.01. Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
3
Annual Book of ASTM Standards, Vol 08.01. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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G21
4.2 The effects to be expected are as follows: used, pro
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