ASTM F484-08

Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid Compounds

ABSTRACT
This test method covers the procedure for determining the crazing effect caused by a liquid or semi-liquid on transparent three types of acrylic plastic materials under bending stress. Cast acrylic materials from Types A and B should be annealed according to specifications while the stretched acrylic materials of Type C should not be annealed. All test specimens should be machined from polished acrylic plastic sheets and should have smooth machined surfaces.
SCOPE
1.1 This test method covers determination of the crazing effect that a liquid or semi-liquid test compound will have on transparent acrylic plastic material that is under bending stress.
1.2 Three types of acrylic material are covered. One, two, or all of the materials shall be used in the test, as specified by the procuring agency. When not specified otherwise, all three types of acrylic shall be used in the test.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Mar-2008
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: F07 - Aerospace and Aircraft
• Drafting Committee: F07.07 - Qualification Testing of Aircraft Cleaning Materials

Relations

• Replaces: ASTM F484-02 - Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid Compounds
• Effective Date: 01-Apr-2008
• Replaced By: ASTM F484-08(2013) - Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid Compounds
• Effective Date: 01-Dec-2013
• Referred By: ASTM D6361/D6361M-98(2020) - Standard Guide for Selecting Cleaning Agents and Processes
• Effective Date: 01-Apr-2008
• Referred By: ASTM F790-23 - Standard Guide for Testing Materials for Aerospace Plastic Transparent Enclosures
• Effective Date: 01-Apr-2008

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F484 − 08
StandardTest Method for
Stress Crazing of Acrylic Plastics in Contact with Liquid or
1
Semi-Liquid Compounds
ThisstandardisissuedunderthefixeddesignationF484;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.1.1 craze—a minute surface crack, sometimes hairline in
size.
1.1 This test method covers determination of the crazing
effect that a liquid or semi-liquid test compound will have on
NOTE 1—Hairline craze cracks are very difficult to see except with
careful inspection under properly oriented light.
transparent acrylic plastic material that is under bending stress.
3.1.2 crack—a fracture or tear.
1.2 Threetypesofacrylicmaterialarecovered.One,two,or
all of the materials shall be used in the test, as specified by the
4. Types
procuringagency.Whennotspecifiedotherwise,allthreetypes
4.1 Type A, cast acrylic material shall conform to MIL-PRF-
of acrylic shall be used in the test.
5425, Finish A.
1.3 The values stated in inch-pound units are to be regarded
4.2 Type B,castacrylicmaterialshallconformtoMIL-PRF-
as standard. The values given in parentheses are mathematical
8184, Finish B.
conversions to SI units that are provided for information only
and are not considered standard.
4.3 Type C, stretched acrylic material shall conform to
MIL-PRF-25690.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Apparatus
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.1 Stress Apparatus—The means of stressing the acrylic
bility of regulatory limitations prior to use. plastic test specimen bars shall be as shown in Fig. 1.
2. Referenced Documents 6. Test Specimens
2
2.1 ASTM Standards: 6.1 The test specimens shall be machined from 0.25 6
D1193 Specification for Reagent Water 0.025 in. (6.4 6 0.64 mm) thick polished acrylic plastic sheet
2.2 Military Standards: conforming to the applicable specification.
3
MIL-PRF-5425 Plastic Sheet, Acrylic, Heat Resistant
6.2 The test specimens shall be 1 6 0.03 in. (25.4 6 0.8
3
MIL-PRF-8184 Plastic Sheet, Acrylic, Modified
mm) wide by 7 6 0.05 in. (177.8 6 1.27 mm) long by 0.25 6
MIL-PRF-25690 Plastic, Sheets and Formed Parts, Modified
0.025 in. (6.4 6 0.64 mm) thick. Edges shall be a smooth
3
Acrylic-Basic, Monolithic, Crack Propagation Resistant
machined surface without cracks.
3. Terminology
7. Conditioning
3.1 Definitions:
7.1 Do not anneal Type C acrylic specimens.
7.2 Anneal Type A and Type B acrylic test specimens after
1
This test method is under the jurisdiction of ASTM Committee F07 on
machiningbyheatinginacirculatingairovenat195 65°F(91
Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.07 on
1
6 3°C) for 5 ⁄2 h. Cool the specimens to room temperature in
Qualification Testing of Aircraft Cleaning Materials.
the oven using a uniform cooling rate of 50°F (28°C)/h.
Current edition approved April 1, 2008. Published April 2008. Originally
approved in 1977. Last previous edition approved in 2002 as F484 – 02. DOI:
7.3 Condition all specimens at 75 6 10°F and 50 6 5%
10.1520/F0484-08.
2 relative humidity for a minimum of 24 h just before testing.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on 8. Procedure
the ASTM website.
3
8.1 Testtwospecimensofeachacrylicmaterialspecifiedfor
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5098, Attn: NPODS. each of the test compounds being evaluated.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F484 − 08
Load: outer fiber stress 3000 psi (20 685 kPa) Type A acrylic
outer fiber stress 3500 psi (24 132 kPa) Type B acrylic
outer fiber stress 4500 psi (31 027 kPa) Type C acrylic
stress in psi
Formula:
2
load, lb5w3t 3
24
stress in kPa
2
load, g5w3t 3
5930
where:
w = width of specimen in inches or millimetres to nearest 0.001 in. or 0.025 mm, respectively, and
t = thickness of specimen in inches or millimetres to nearest 0.001 in. or 0.025 mm, respectively. Width and thickness shall be measured
at the stress area.
1
Note: The fulcrum radius shall be ⁄4 in. (6.4 mm) where it bears on the acrylic specimen.
FIG. 1 Description of Str
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:F484–02 Designation:F484–08
Standard Test Method for
Stress Crazing of Acrylic Plastics in Contact with Liquid or
1
Semi-Liquid Compounds
This standard is issued under the fixed designation F 484; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 This test method covers determination of the crazing effect that a liquid or semi-liquid test compound will have on
transparent acrylic plastic material that is under bending stress.
1.2 Three types of acrylic material are covered. One, two, or all of the materials shall be used in the test, as specified by the
procuring agency. When not specified otherwise, all three types of acrylic shall be used in the test.
1.3
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D 1193 Specification for Reagent Water
2.2 Military Standards:
3
MIL-PRF-5425 Plastic Sheet, Acrylic, Heat Resistant
3
MIL-PRF-8184 Plastic Sheet, Acrylic, Modified
MIL-P-25690MIL-PRF-25690 Plastic, Sheets and Formed Parts, Modified Acrylic-Basic, Monolithic, Crack Propagation
3
Resistant
3. Terminology
3.1 Definitions:
3.1.1 craze—a minute surface crack, sometimes hairline in size.
NOTE 1—Hairline craze cracks are very difficult to see except with careful inspection under properly oriented light.
3.1.2 crack—a fracture or tear.
4. Types
4.1 Type A, cast acrylic material shall conform to MIL-PRF-5425, Finish A.
4.2 Type B, cast acrylic material shall conform to MIL-PRF-8184, Finish B.
4.3 Type C, stretched acrylic material shall conform to MIL-PRF-25690.
5. Apparatus
5.1 Stress Apparatus—The means of stressing the acrylic plastic test specimen bars shall be as shown in Fig. 1.
1
This test method is under the jurisdiction ofASTM Committee F07 onAerospace andAircraft and is the direct responsibility of Subcommittee F07.07 on Qualification
Testing of Aircraft Cleaning Materials.
e1
Current edition approved May 10, 2002. Published July 2002. Originally published as F484–77. Last previous edition F484–83 (1998) .
Current edition approved April 1, 2008. Published April 2008. Originally approved in 1977. Last previous edition approved in 2002 as F 484 – 02.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
, Vol 11.01.volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
F484–08
Load: outer fiber stress 3000 psi (20 685 kPa) Type A acrylic
outer fiber stress 3500 psi (24 132 kPa) Type B acrylic
outer fiber stress 4500 psi (31 027 kPa) Type C acrylic
stress in psi
Formula:
2
load, lb 5 w 3 t 3
24
stress in kPa
2
load, g 5 w 3 t 3
5930
where:
w = width of specimen in inches or millimetres to nearest 0.001 in. or 0.025 mm, respectively, and
t = thickness of specimen in inches or millimetres to nearest 0.001 in. or 0.025 mm, respectively. Width and thickness shall be measured
at the stress area.
1
Note: The fulcrum radius shall be ⁄4 in. (6.4 mm) where it bears on the acrylic specimen.
FIG. 1 Description of Stressing Procedure
6. Test Specimens
6.1 The test specimens shall be machined from 0.25 6 0.025 in. (6.4 6 0.64 mm) thick polished acrylic plastic sheet
conforming to the applicable specification.
6.2 The test specimens shall be 1 6 0.03 in. (25.4 6 0.8 mm) wide by 7 6 0.05 in. (177.8 6 1.27 mm) long by 0.25 6 0.025
in. (6.4 6 0.64 mm) thick. Edges shall be a smooth machined surface without cracks.
7. Con
...