1. Scope1.1 This test method covers the determination of the temperature at which an arbitrary deformation occurs when specimens are subjected to an arbitrary set of testing conditions.
1.2 This test method applies to molded and sheet materials available in thicknesses of 3 mm [1?8 in.] or greater and which are rigid or semirigid at normal temperature.
NOTE 1¡ªSheet stock less than 3 mm [0.125 in.] but more than 1 mm [0.040 in.] in thickness may be tested by use of a composite sample having a minimum thickness of 3 mm. The laminae must be of uniform stress distribution. One type of composite specimen has been prepared by cementing the ends of the laminae together and then smoothing the edges with sandpaper. The direction of loading shall be perpendicular to the edges of the individual laminae.
1.3 The values stated in SI units are to be regarded as standard. The values given in brackets are for information only.
1.4 Due to the potential safety and environmental hazards associated with mercury-?lled thermometers, the use of alternative temperature measuring devices (such as thermocouples or RTDs) is encouraged.
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.
NOTE 2¡ªThe test method described as a Method B of this test method, and test methods Ae and Be of ISO 75-1 and ISO 75-2, 1993, are technically equivalent.
2. Referenced Documents
2.1 ASTM Standards:
D 618 Practice for Conditioning Plastics for Testing
D 883 Terminology Relating to Plastics
D 1898 Practice for Sampling of Plastics3
D 5947 Test Methods for Physical Dimensions of Solid
Plastics Specimens
E1 Speci?cation for ASTM Liquid-in-Glass Thermometers
E77 Test Method for Inspection and Veri?cation of Thermometers
E 608/E 608M Speci?cation for Mineral-Insulated, Metal Sheathed Base Metal Thermocouples
E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E 1137/E 1137M Speci?cation for Industrial Platinum Resistance Thermometers
2.2 ISO Standards:
ISO 75-1 Plastics¡ªDetermination of Temperature of De?ection Under Load¡ªPart 1: General Test Method
ISO 75-2 Plastics¡ªDetermination of Temperature of De?ection Under Load¡ªPart 2: Plastics and Ebonite
2.3 NIST Document:
NBS Special Publication 250-22