ASTM-D5224 Standard Practice for Compression Molding Test Specimens of Thermosetting Molding Compounds

ASTM-D5224 - 2012 R19 EDITION - CURRENT
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Standard Practice for Compression Molding Test Specimens of Thermosetting Molding Compounds
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Scope

1.1 This practice covers the general principles to be followed when compression molding test specimens of thermosetting molding compounds, such as phenolics, aminoplastics, melamine phenolics, epoxies, and unsaturated polyesters.

1.2 Molding conditions are given for amino, phenolic, and allyl molding compounds. The exact molding conditions will vary from material to material, and, if not incorporated in the material specification, shall be agreed upon between the purchaser and the supplier or determined by previous experience with the particular type of material being used

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

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Note 1: This standard and ISO 295 address the same subject matter, but differ in technical content.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Significance and Use

5.1 The conditions at which compounds are molded are known to influence the properties of the specimens. The degree of cure, elimination of knit-lines between particles, density of the part, and degradation of the polymer are among those factors which will be affected by the molding conditions. Thus it is important to conform to a standard set of conditions in order to have a valid comparison of properties between different compounds and different batches of the same compound.

5.2 Molded specimens showing evidence of low-density areas due to trapped gases shall be discarded. A breathe step can be incorporated to eliminate this situation. If used, it is critical that the breathe step be as brief as possible to avoid precuring of the compound before full pressure is applied leading to poorly “knitted” areas and lower strength in the molded specimen.

Keywords

allyl molding compound; amino molding compound; compression molding; phenolic molding compound; plastics; thermoset;

To find similar documents by ASTM Volume:

08.03 (Plastics (III): D5117 - latest; Reinforced Plastic Piping Systems and Chemical Equipment; Plastic Building Products)

To find similar documents by classification:

77.180 (Equipment for the metallurgical industry)

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Document Number

ASTM-D5224-12(2019)

Revision Level

2012 R19 EDITION

Status

Current

Modification Type

Reapproval

Publication Date

June 1, 2019

Document Type

Practice

Page Count

5 pages

Committee Number

D20.09