ASTM D731-10
Standard Test Method for Molding Index of Thermosetting Molding Powder

Standard No.

ASTM D731-10

Release Date

2010

Published By

American Society for Testing and Materials (ASTM)

Status

Withdraw

Replace By

ASTM D731-18

Latest

ASTM D731-22

Scope

This test method provides a guide for evaluating the moldability of thermosetting molding powders. This test method does not necessarily denote that the molding behavior of different materials will be alike and trials may be necessary to establish the appropriate molding index for each material in question.

The sensitivity of this test diminishes when the molding pressure is decreased below 5.3 MPa (764 psi), so pressures lower than this are not ordinarily recommended. This is due to the friction of moving parts and the insensitivity of the pressure switch actuating the timer at these low pressures.

1.1 This test method covers the measurement of the molding index (plasticity) of thermosetting plastics ranging in flow from soft to stiff by selection of appropriate molding pressures within the range from 3.7 to 36.5 MPa (530 to 5300 psi).

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 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 18212;There is no known ISO equivalent to this test method.

ASTM D731-10 Referenced Document

• ASTM D256 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
• ASTM D883 Standard Terminology Relating to Plastics
• ASTM D957 Standard Practice for Determining Surface Temperature of Molds for Plastics
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM D731-10 history

• 2022 ASTM D731-22 Standard Test Method for Molding Index of Thermosetting Molding Powder
• 2018 ASTM D731-18 Standard Test Method for Molding Index of Thermosetting Molding Powder
• 2010 ASTM D731-10 Standard Test Method for Molding Index of Thermosetting Molding Powder
• 2008 ASTM D731-08 Standard Test Method for Molding Index of Thermosetting Molding Powder
• 1995 ASTM D731-95(1999) Standard Test Method for Molding Index of Thermosetting Molding Powder