Significance and Use

Weight loss through volatilization of components of a sealant in a building joint may affect sealant appearance because of shrinkage and sealant performance because of the loss of functional sealant components. Exposure to high-temperature environments will accelerate the loss of volatiles.

This test method measures weight loss. It can be used in combination with a knowledge of sealant density to estimate shrinkage. In addition, when compared to sealant theoretical weight solids, it provides an estimate of the extent to which functional sealant components can be volatilized when exposed to high service temperatures. Substantial losses of this type may help predict early failures in durability. Also, development of cracks or chalking, or both, lessens sealant service life. However, a sealant that develops no cracks or chalking, or low weight loss in this test method, does not necessarily assure good durability.

1. Scope

1.1 This test method covers a laboratory procedure for determining the effects of heat aging on weight loss, cracking, and chalking of cured-in-place elastomeric joint sealants (single- and multicomponent) for use in building construction.

1.2 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.

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

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

C717 Terminology of Building Seals and Sealants

Keywords

chalking; compound; cracking; elastomeric sealants; heat aging; non-sag sealants; self-leveling sealant; weight loss; Accelerated aging/testing--elastomeric sealants; Appearance of materials; Chalking; Cracking--sealants; Elastomeric seals/sealants; Heat aging; Joint seals/sealants; Nonsag joint sealants; Self-leveling joint sealants; Weight loss;

ICS Code

ICS Number Code 83.060 (Rubber); 91.100.50 (Binders. Sealing materials)

DOI: 10.1520/C0792-04R08

ASTM International is a member of CrossRef.

ASTM C792