ASTM D7474-08
Historical Standard: ASTM D7474-08 Standard Practice for Determining Residual Stresses in Extruded or Molded Sulfone Plastic (SP) Parts by Immersion in Various Chemical Reagents
SUPERSEDED (see Active link, below)
ASTM D7474
1. Scope
1.1 This 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.
1.2 This 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 D 6394 for melt flow rate conditions.)
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
Note 1There is no equivalent ISO 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ISO Standard
ISO220883 PlasticsDetermination of Resistance to Environmental Stress Cracking (ESC)Part 3: Bent Strip MethodASTM Standards
D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents
D883 Terminology Relating to Plastics
D4000 Classification System for Specifying Plastic Materials
D6394 Specification for Sulfone Plastics (SP)
Keywords
liquid reagent; PESU; PPSU; PSU; residual stress; SP; stress cracking; Environmental stress crack resistance (ESCR); Residual stress; Stress cracking tests; Sulfone plastics (SP)
ICS Code
ICS Number Code 83.080.01 (Plastics in general)
DOI: 10.1520/D7474-08
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