ASTM D 7474 : 2017 : REDLINE
Current
The latest, up-to-date edition.
Standard Practice for Determining Residual Stresses in Extruded or Molded Sulfone Plastic (SP) Parts by Immersion in Various Chemical Reagents
English
15-08-2017
Important note : All end users must be registered with an Account prior to user licenses being assigned.CONTAINED IN VOL. 08.03, 2017 Describes the evaluation of residual stresses in extruded profile or molded SP parts.
| Committee |
D 20
|
| DocumentType |
Redline
|
| Pages |
5
|
| PublisherName |
American Society for Testing and Materials
|
| Status |
Current
|
1.1This practice covers the evaluation of residual stresses in extruded profile or molded SP parts. The presence and relative magnitude of residual stresses are indicated by the crazing of the specimen part upon immersion in one or more of a series of chemical reagents. The specified chemical reagents were previously calibrated by use of Environmental Stress Cracking (ESC) techniques to cause crazing in sulfone plastics (SP) at specified stress levels.
1.2This practice applies only to unfilled injection molding and extrusion grade materials of high molecular weight as indicated by the following melt flow rates: PSU 9 g/10 min, max., PESU 30 g/10 m, max, and PPSU 25 g/10 min, max. Lower molecular weight (higher melt flow) materials will craze at lower stress levels than indicated in Tables 1-3. (See Specification D6394 for melt flow rate conditions.)
TABLE 1 Liquid Reagents for Residual Stress Test for PSU
| Mixture | Mixture Composition | Critical Stress, MPa (psi) | |
| % by volume Ethanol | % by volume Ethyl Acetate | ||
| 1 | 50 | 50 | 15.2 (2200) |
| 2 | 43 | 57 | 12.1 (1750) |
| 3 | 37 | 63 | 9.0 (1300) |
| 4 | 25 | 75 | 5.5 (800) |
TABLE 2 Liquid Reagents for Residual Stress Test for PESU
| Mixture | Mixture Composition | Critical Stress, MPa (psi) | |
| % by volume Ethanol | % by volume MEK | ||
| 1 | 50 | 50 | 17.9 (2600) |
| 2 | 40 | 60 | 10.3 (1500) |
| 3 | 20 | 80 | 6.9 (1000) |
| 4 | 0 | 100 | 5.9 (850) |
TABLE 3 Liquid Reagents for Residual Stress Test for PPSU
| Mixture | Mixture Composition | Critical Stress, MPa (psi) | |
| % by volume Ethanol | % by volume MEK | ||
| 1 | 50 | 50 | 22.8 (3300) |
| 2 | 25 | 75 | 13.8 (2000) |
| 3 | 10 | 90 | 9.0 (1300) |
| 4 | 0 | 100 | 8.0 (1150) |
1.3The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
Note 1:There is no known ISO equivalent for this standard.
1.4This 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.
1.5This 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.
| ASTM D 618 : 2013 : REDLINE | Standard Practice for Conditioning Plastics for Testing |
| ASTM D 6394 : 2014 : REDLINE | Standard Specification for Sulfone Plastics (SP) |
| ASTM D 543 : 2014 : REDLINE | Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents |
| ISO 22088-3:2006 | Plastics Determination of resistance to environmental stress cracking (ESC) Part 3: Bent strip method |
| ASTM D 4000 : 2016 : REDLINE | Standard Classification System for Specifying Plastic Materials |
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