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State properties of insulating materials.
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(i) Resistivity should be very high. (ii) It should be water resistant. (iii) It should not contain impurities. (iv) It should not be affected chemically and not corroded easily. (v) Its resistance should not drop under high voltage and high temperature. (vi) It should be mechanically strong (tensile strength should be more). (vii) It should not be porous.
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