GB/T 33831-2017Coated glass fiber products—Determination of resistance to creasing and folding behaviour (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

1 Scope

This Standard specifies the principle, apparatus, specimen, operation, test results and test report for determination of resistance to creasing and folding behavior of coated glass fiber products.

This Standard is applicable to the products using glass fiber cloth as the substrate coated with polyvinyl chloride, polyurethane, fluorine resin, chloroprene rubber or chlorosulfonated polyethylene rubber.

2 Normative References

The following document is essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

GB/T 7689.5 Reinforcements - Test Method for Woven Fabrics - Part 5: Determination of Tensile Breaking Force and Elongation at Break for Glass Fiber

3 Principle

Fold the elongated specimen in the length direction; use roller to roll in the length direction for several times; unfold the specimen and measure its tensile breaking force; use the retention rate of tensile breaking force to represent the resistance to creasing and folding behavior of the products.

4 Apparatus

4.1 The example of creasing and folding roller can refer to Figure 1.

The roller shall be made of stainless steel, its surface shall be smooth with diameter of (90±1) mm, width of (100±1) mm; the tray for placing the counterweight shall be equipped with to ensure the creasing and folding force of the roller acting on the folding […]

7 Test Results

Take the breaking load per unit width as the tensile breaking force (N/mm) of the specimen; respectively calculate the average value of warp and weft tensile breaking force of the initial specimen and specimen through treatment; and calculate the retention rate of tensile breaking force, which shall reserve one digit after decimal.

8 Test Report

The test report shall include the following contents.

a) Instructions are based on this Standard;

b) Identify the necessary details of the sample to be tested;

c) The Number of specimen;

d) Humidity control and test environment;

e) Tester type and range;

f) Specimen width and the number of yarns;

g) Creasing and folding force;

h) Tensile breaking force of the initial and treated coated glass fiber products;

i) Retention rate of tensile breaking force;

j) Any operation details that are not mentioned in this Standard; or any factors that may influence the results;

k) Test personnel, and test date;

l) Other test-related information. […]