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The key of insulating rubber sheet is rubber insulating layer material, which is made of NR, SBR and IIR non-polar vulcanized rubber with high dielectric strength. There should be no harmful irregularity on the left and right surfaces of insulating rubber sheet.
The irregularity of harm refers to one of the following characteristics, that is, the defects of destroying symmetry and surface smoothness, such as small round hole, gap, partial protrusion, wound, inclusion of conductive dirt, crease, gap, convex concave wavy pattern and forging mark, etc.
Harmless irregularity refers to the surface irregularity produced in the production process. The cost-effective insulating rubber sheet has no odor, bubble and dent, and the surface is clean and clean.
The thickness measurement method of insulating rubber sheet is as follows:
Five different points on all insulating rubber sheets shall be randomly selected for thickness measurement and inspection. Vernier calipers or instruments with the same accuracy can be used for measurement. The accuracy of vernier caliper should be within 0.02mm, the diameter of drill is 6mm, and the diameter of presser foot in plan is (3.17mm) ± 25) mm, the presser foot should be able to release (0. 83 0 ± 03) n. The insulating rubber plate should be placed flat so that the middle of the vernier caliper measurement is smooth.
There should be no harmful irregularity on the left and right surfaces of insulating rubber sheet. The irregularity of the harm of insulating rubber sheet refers to one of the following characteristics, that is, the defects of destroying symmetry and surface smoothness, such as small round hole, gap, partial protrusion, wound, inclusion of conductive dirt, crease, convex concave wavy pattern and forging mark, etc.