ASTM D494

For molded phenolic products, acetone extraction should be considered solely as a quantitative expression of a property normally associated with degree of cure. There is no demonstrably rigorous relation between the optimum mechanical and electrical properties of a well-cured piece and the numerical value of the acetone test. The amount of acetone-soluble matter is affected by: (1) nature of resin and filler, (2) lubricant, (3) molding temperature, (4) length of cure, (5) thickness of the section from which sample is taken, (6) nature of molded piece, (7) technique used in molding, (8) distribution of fines in the material to be extracted, and (9) method of grinding the specimen. These variations under some conditions may cause a difference of 3 to 4 % in acetone-extractable matter. For this reason, the test method should be used only as a comparative test for measuring undercure.

For laminated phenolic products, acetone extraction indicates change in stage of cure, change in resin content, change in type of resin used, presence of plasticizers or other acetone-extractable addition agents, and is affected in general by the same factors as stated in 6.1

1. Scope

1.1 This test method covers the determination of the amount of acetone-soluble matter in molded or laminated phenolic products.

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

1.3 This standard does not purport to address all of the safety problems, 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.

2. Referenced Documents

ASTM Standards
D618 Practice for Conditioning Plastics for Testing
D883 Terminology Relating to Plastics
E11 Specification for Wire Cloth and Sieves for Testing Purposes
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

Index Terms

acetone extraction; cure; laminated plastic; molded plastic; phenolic resin; plasticizers; ICS Number Code 140.20

Citing ASTM Standards

[Back to Top]