ASTM-D6289 › Historical Revision Information
Standard Test Method for Measuring Shrinkage from Mold Dimensions of Molded Thermosetting Plastics
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Scope
1.1 This test method is intended to measure batch-to-batch uniformity in initial shrinkage from mold to molded dimensions of thermosetting materials when molded by compression, injection, or transfer under specified conditions.
1.2 This test method provides for the measurement of shrinkage of thermosetting plastics from their molds both initially (within 16 to 72 h of molding) and as they age (post-shrinkage at elevated temperatures).
1.3 Knowledge of the initial shrinkage of plastics is important for the construction of molds and knowledge of post molding shrinkage is important for determining the suitability of the molding material for manufacturing thermosetting plastic components with accurate dimensions.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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.
Note 1-This test method and ISO 2577-1984 are equivalent when bars of 120 mm length, 15 mm width, and 10 mm thickness are used for compression molding; or flat, square plaques approximately 120 by 120 by 4 mm are used for injection molding.
Keywords
molding shrinkage; post-molding shrinkage; thermoset plastics; ICS Number Code 83.080.10 (Thermosetting materials)
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To find similar documents by classification:
83.080.10 (Thermosetting materials Including ebonite Silicones, see 71.100.55)
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Document Number
ASTM-D6289-98
Revision Level
1998 EDITION
Status
Superseded
Modification Type
New
Publication Date
July 10, 1998
Document Type
Test Method
Page Count
4 pages
Committee Number
D20.09