High voltage insulated rubber sheet insulated sheet known as the (insulated rubber mats, insulation pads) definition insulating rubber sheet has excellent insulating properties, is the use of plastic type insulation materials. Insulation sheet as the main place for electronic workbench and floor laying, power station, substation ground laying and installation. So, for the storage method, should be stored in dry and ventilated environment, away from heat, more than 20cm off the ground and walls. Avoid being affected by acid-base and oil pollution, not open to prevent direct sunlight. Working environment must state in 660V and in the dry air -35 ~ +100 ℃ high dielectric coefficient of the case. High voltage insulated rubber sheet How to Buy First look insulating rubber sheet Appearance: 1) scar depth and height does not exceed the sheet thickness tolerance 2) bubbles per square meter, an area of ??less than 1cm bubble is not more than 5, the distance between any two bubbles are not less than 40mm. 3) impurity depth and length does not exceed the plastic sheet thickness of 1/64) incomplete or sea-like edge width not exceeding 10mm, plastic sheet total length does not exceed 1/105) no cracks 2. Hardness (Shore A) :55 -703. elongation (150%) permanent deformation ≤ 25% 4. hot air aging (70 ℃ * 72h): Tensile strength reduction rate ≤ 30% 5. Tensile strength and elongation at break: 1 ) Tensile strength (Mpa) ≥ 5.0 2) Elongation at break ≥ 250% high voltage insulated rubber sheet production process insulated pad under the surface there should be no harmful irregularities. Harmful irregularities refers to one of the following characteristics, namely destroy the uniformity of damaging the surface smooth contour defects such as holes, cracks, local uplift, incision, mixed with conductive particles, creases, voids, bump, ripple and casting marks . Harmless irregularities in the production process of the formation of surface irregularities.