This standard specifies the methods for determination of brittleness point of vulcanized rubber with single test piece and brittleness point test machine, and for judgment of whether vulcanized rubber after impacted at specified temperature is fail or not, which including two procedures: Procedure A is applicable to the determination of brittleness point; Procedure B is applicable to the judgment of whether impact test piece, at specified temperature, result in fail or not.
Note: The brittleness point measured in this standard is the representative temperature of vulcanized rubber, rather than the lower limit of operating temperature of vulcanized rubber and their products. Brittleness temperature may be used to compare the superior and inferior low temperature properties of different rubber materials or vulcanized rubbers with different formulae. Therefore, this standard with certain practical value for quality inspection, production process control and other operations of rubber materials and their products.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies.
GB/T 2941-2006 Rubber — General Procedures for Preparing and Conditioning Test Pieces for Physical Test Methods (ISO 23529:2004, IDT)
3 Terms and Definitions
For the purpose of this document, the following terms and definitions apply.
3.1
Brittleness point (single test piece method)
The highest temperature at fail of test piece when impact under certain conditions.
3.2
Fail
The phenomenon of fractures, cracks and visible micropores appear on the test piece.
