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ASTM F484-08(2013)

(Test Method)

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

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
30-Nov-2013
ICS
83.080.10 - Thermosetting materials
Technical Committee
F07 - Aerospace and Aircraft
Drafting Committee
F07.07 - Qualification Testing of Aircraft Cleaning Materials
Current Stage
Ref Project

Relations

Replaces
ASTM F484-08 - 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-Dec-2013
Referred By
ASTM F790-23 - Standard Guide for Testing Materials for Aerospace Plastic Transparent Enclosures
Effective Date
01-Dec-2013

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ASTM F484-08(2013) - Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid CompoundsASTM F484-08(2013) - Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid Compounds
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ASTM F484-08(2013) - Standard Test Method for Stress Crazing of Acrylic Plastics in Contact with Liquid or Semi-Liquid Compounds
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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: F484 − 08 (Reapproved 2013)
Standard Test Method for
Stress Crazing of Acrylic Plastics in Contact with Liquid or
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 U.S. 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
2.1 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.
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
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
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
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
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 Dec. 1, 2013. Published December 2013. Originally
approved in 1977. Last previous edition approved in 2008 as F484 – 08. DOI:
7.3 Condition all specimens at 75 6 10°F and 50 6 5%
10.1520/F0484-08R13.
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 service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on 8. Procedure
the ASTM website.
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
F484 − 08 (2013)
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:
load, lb5w3t 3
stress in kPa
load, g5w3t 3
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.
Note: The fulcrum radius shall be ⁄4 in. (6.4 mm) where it bears on the acrylic specimen.
FIG. 1 Description of Stressing Procedure
8.2 Conduct the test at a temperature of 75 6 10°F (23 6 of the test specimen. No test compound should cont
...

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