Insulated rubber sheet test methods and test specifications

4.1 General requirements for physical and mechanical properties test method in accordance with GB527 performed.

4.2 Test conditions were a sample according to GB2941.

4.3 Determination of hardness by GB531 performed.

4.4 tensile strength, tensile elongation was measured according to GB528 were. Type 1 tests using the cutter.

4.5 Determination of permanent deformation modulus by HG4-859 performed. Tensile specimens 150% holding 15min, removed after recovery from the holder 5min.

4.6 Hot air aging test conducted by GB3512.

4.7 water absorption test conducted by GB1034.

4.8 Size and accuracy of 0.02mm with a tape measure to measure the caliper. Measurement of the thickness of the sheet should be at both ends evenly across 5 points; sheet thickness with a pattern top pattern should be measured.

4.9 appearance quality plastic sheet by visual inspection and measuring.

4.10 Breakdown voltage test conducted by GB1695. Test methods for continuous and uniform boost the number of specimens of five.

4.11 withstand voltage test:

4.11.1 Test instruments and test equipment line basic requirements should be consistent with the relevant provisions of GB1695.

Insulated rubber sheet can be used 3mm thick, rectangular metal plate edges chamfered and rounded smooth, damp cloth or 3mm thick conductive rubber sheet.

4.11.2 Test procedure:

4.11.2.1 The test sheet flat ground floor in the middle of the test platform, the upper and lower plates centrosymmetric, plate four sides should be smaller than the measured sheet 150mm, and even overlap, can not leave gaps.

4.11.2.2 continuous and uniform boost to the sample to a predetermined voltage value, 1min, to observe whether the breakdown phenomenon. If there is no breakdown, the sheet resistance voltage test pass.

When 4.11.2.3 Sample segmentation test, two test edge to overlap, to avoid leakage test.

4.11.2.4 If the breakdown phenomenon, breakdown should be cut next part, marked scrap marks; no breakdown of the partial re-test until no breakdown, sheet resistance voltage test in order to pass.