Standard Test Method for
Evaluating Stress Cracking of Plastics by Adhesives Using
the Bent-Beam Method1

This standard is issued under the fixed designation D 3929; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This test method describes a procedure for determining
the compatibility of adhesives with plastics based on whether
the adhesive causes cracking of stressed samples.

1.2 Specimen configurations and test fixture designs are
given.

1.3 This test method is suitable for products in the form of
sheet or strip. It can also be used on injection molded tensile
specimens or flexural bars.

1.4 The values stated in SI units are to be regarded as the
standard. The inch-pound units given in parentheses are for
information only.

1.5 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.

2. Referenced Documents

2.1 ASTM Standards:
D 638 Test Method for Tensile Properties of Plastics2
D 790 Test Methods for Flexural Properties of Unreinforced
and Reinforced Plastics and Electrical Insulating Materials2
D 907 Terminology of Adhesives2

3. Terminology

3.1 Definitions—Many of the terms in this test method are
defined in Terminology D 907.

3.2 Definitions of Terms Specific to This Standard:

3.2.1 cracking, n—a continuous localized failure of the
plastic, leading to loss of structural integrity.

3.2.2 crazing, n—apparent fine cracks at or under the
surface of a plastic.

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