ASTM International

Standard Test Methods for Breaking Load and Flexural Properties of Block-Type Thermal Insulation
 N C203 REV A

Annotation

These test methods cover the determination of the breaking load and calculated flexural strength of a rectangular cross section of a preformed block-type thermal insulation tested as a simple beam. It is also applicable to cellular plastics. Two test methods are described as follows:

Test Method I-A loading system utilizing center loading on a simply supported beam, supported at both ends.

Test Method II-A loading system utilizing two symmetric load points equally spaced from their adjacent support points at each end with a distance between load points of one half of the support span.

Either test method is capable of being used with the four procedures that follow:

Procedure A- Designed principally for materials that break at comparatively small deflections.

Procedure B- Designed particularly for those materials that undergo large deflections during testing.

Procedure C- Designed for measuring at a constant stress rate, using a CRL (constant rate of loading) machine. Used for breaking load measurements only.

Procedure D- Designed for measurements at a constant crosshead speed, using either a CRT (constant rate of traverse) or CRE (constant rate of extension) machine. Used for breaking load measurements using a fixed crosshead speed machine.

Comparative tests are capable of being run according to either method or procedure, provided that the method or procedure is found satisfactory for the material being tested.