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Standard for inspection of rubber sheets

Date:2013-2-3 09:42
Inspection standard for insulating rubber sheet: (8mm insulation rubber sheet as an example)
1. appearance:
1) no scar depth and height than plywood thickness tolerances.
2) bubble per square meter, the area of less than 1cm of the bubble no more than 5, any two bubbles between the distance of not less than 40mm.
3) the depth and length of impurities shall not exceed 1/6 of the thickness of the plywood.
4) the edge is uneven or the width of the sea surface is not more than 10mm, and the length is not more than 1/10 of the total length of the rubber plate.
5) no cracks.
2. hardness (Shao Er A): 55-70.
The tensile strength and elongation at break of 3:
1) the tensile strength (Mpa = 5).
2) elongation is greater than or equal to 250%.
4. elongation (150%) permanent deformation is less than or equal to 25%.
5. hot air aging (70 degrees *72h): decrease the tensile strength ratio of 30%.
6. water is less than or equal to 1.5%.
7. electrical insulation performance test:
1) withstand voltage test: 25KV (RMS), maintain 1min, there should be no breakdown phenomenon.
2) breakdown voltage test is greater than or equal to 35KV (RMS).
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