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ASTM D3123-09

Current Revision

Standard Test Method for Spiral Flow of Low-Pressure Thermosetting Molding Compounds

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1.1 This test method covers a procedure for measuring the spiral flow of thermosetting molding compounds (soft or very soft) designed for molding pressures under 6.9 MPa (1000 psi). It is especially suited for those compounds used for encapsulation or other low pressure molding techniques. It involves the use of a standard spiral flow mold in a transfer molding press under specified conditions of applied temperature and pressure with a controlled charge mass.

1.2 The values stated in SI units are to be regarded as standard.

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 1—There is no known ISO equivalent to this test method.


The spiral flow of a thermosetting molding compound is a measure of the combined characteristics of fusion under pressure, melt viscosity, and gelation rate under specific conditions.

This test method is useful as a quality control test and as an acceptance criterion.

This test method, by itself, is not a valid means for comparing the moldability of similar or different molding compounds because it cannot duplicate actual conditions prevalent in different types of production molds.

This test method is presently intended for use at a transfer pressure of 6.9 MPa (1000 psi) and a mold temperature of 423 ± 3 K (150 ± 3°C (302 ± 5°F)).

SDO ASTM: ASTM International
Document Number D3123
Publication Date Sept. 1, 2009
Language en - English
Page Count 4
Revision Level 09
Supercedes
Committee D20.30
Publish Date Document Id Type View
Sept. 1, 2009 D3123-09 Revision
Nov. 10, 1999 D3123-98R99E01 Revision
Aug. 1, 2017 D3123-09R17 Reaffirmation
Oct. 1, 2004 D3123-98R04 Reaffirmation