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  • ASTM
    D955-00 Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics
    Edition: 2000
    $93.60
    Unlimited Users per year

Description of ASTM-D955 2000

ASTM D955-00

Historical Standard: ASTM D955-00 Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics

SUPERSEDED (see Active link, below)



Translated Standard: Russian
more info


ASTM D955

1. Scope

1.1 This test method is intended to measure shrinkage from mold cavity to molded dimensions of thermoplastics when molded by compression or injection processes with specified process conditions.

1.2 This test method covers initial shrinkage measurements. The method also accommodates shrinkage at 24 and 48 h, which may be critical for some materials.

1.3 This method will give comparable data based on standard specimens and can not predict absolute values in actual molded parts with varying flow paths, wall thicknesses, pressure gradients and process conditions. Differences in mold shrinkage may also be observed between the three specimen geometries described in this test method.

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are given 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 is technically identical to ISO 294-4 where Type D2 specimens are used except that pressure transducers are an option in this test method and required in ISO 294-4.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D618 Practice for Conditioning Plastics for Testing

D788 Classification System for Poly(Methyl Methacrylate) (PMMA) Molding and Extrusion Compounds

D883 Terminology Relating to Plastics

D3641 Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials

D4066 Classification System for Nylon Injection and Extrusion Materials (PA)

D4549 Classification System and Basis for Specification for Polystyrene and Rubber-Modified Polystyrene Molding and Extrusion Materials (PS)

D4703 Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets

D4976 Specification for Polyethylene Plastics Molding and Extrusion Materials

D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens

D6778 Classification System and Basis for Specification for Polyoxymethylene Molding and Extrusion Materials (POM)

D6779 Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (PA)

E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


Keywords

mold shrinkage; shrinkage; thermoplastics; Molding/extrusion compounds/materials; Mold shrinkage; Shrinkage--plastics; Thermosetting plastics;


ICS Code

ICS Number Code 83.140.10 (Films and sheets)


DOI: 10.1520/D0955-00

ASTM International is a member of CrossRef.


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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.

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