UL 746A:2006 pdf download.Polymeric Materials -Short Term Property Evaluations.
8.3 Thickness and directional properties
8.3.1 The properties of plastics may vary with thickness and with orientation of the material. Therefore, when preparing specimens, consideration is to be given to the testing of specimens that are representative of both the thickest and the thinnest sections of the product, and where mechanical tests are involved, the testing of specimens that have been cut lengthwise. crosswise, and also normal to the surface of the material.
8.4 Treatment prier to test
8.4.1 Samples and specimens for tests shall not be heated, immersed in water, or sttjected to any mechanical or chemical treatment prior to test except as specifically described in the individual test method.
8.4.2 Unless otherwise specified lithe individual test method, thermoplastic materials are 10 be injection molded while therrnoset materials are to be compression or transfer molded.
8.5 Testing conditions
8.5.1 Unless otherwise specified in an ASTM or ISO material specification or in an individual test method, the standard atmospheric conditions surrounding the specimen for a minimum of 88 hours prior to and during the test shall be 23 ±2° C (73.4 ± 3.6° F) and 50 ± 10 percent relative humidity (Class 2 in accordance with ISO 291).
8.3.1 The properties of plastics may vary with thickness and with orientation of the material. Therefore, when preparing specimens, consideration is to be given to the testing of specimens that are representative of both the thickest and the thinnest sections of the product, and where mechanical tests are involved, the testing of specimens that have been cut lengthwise. crosswise, and also normal to the surface of the material.
8.4 Treatment prier to test
8.4.1 Samples and specimens for tests shall not be heated, immersed in water, or sttjected to any mechanical or chemical treatment prior to test except as specifically described in the individual test method.
8.4.2 Unless otherwise specified lithe individual test method, thermoplastic materials are 10 be injection molded while therrnoset materials are to be compression or transfer molded.
8.5 Testing conditions
8.5.1 Unless otherwise specified in an ASTM or ISO material specification or in an individual test method, the standard atmospheric conditions surrounding the specimen for a minimum of 88 hours prior to and during the test shall be 23 ±2° C (73.4 ± 3.6° F) and 50 ± 10 percent relative humidity (Class 2 in accordance with ISO 291).
