This Part of GB/T 328 specifies the test methods for strengthening the flexibility at low temperature of the waterproof sheet for the bitumen roofing; the unreinforced bitumen sheets for waterproofing may also refer to this Part.
In this Part, both the upper surface and lower surface of the sheet shall pass through the test at specified temperature or continue to be determined within the scope of different temperatures, as the cold bending temperature of polarity temperature. This Part may be also used to determine the minimum cold bending temperature of the product or determine the cold bending temperature specified for the product, such as determining the performance change of the product after the accelerated aging.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this Part in GB/T 328. For dated reference, subsequent amendments to (excluding corrigenda), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document applies.
GB/T 328.1 Test Methods for Building Sheets for Waterproofing - Part 1: Bitumen Plastic and Rubber Sheets for Waterproofing - Rules for Sampling
GB/T 6379.2 Accuracy (Trueness and Precision) of Measurement Methods and Results - Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method (ISO 5725-2: 1994, IDT)
GB/T 328.14-2007 The following standards are cited：
GB/T 328.14-2007 Cited by the following standards：
