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        Insulation compound GP4

        NO.

        Test Items

        Values

        1

        Before ageing test

        1.1 Tensile strength(MPa)

        ≥ 6.5

        1.2 Elongation at break(%)

        ≥ 200

        2

        Air oven ageing test

        2.1 Test condition

        135±2℃/168h

        2.2Tensile strength rate(%)

        ≤ 30

        2.3 Elongation at break rate (%)

        ≤ 30

        3

        Air bomb ageing test

        3.1 Test condition

        127±2℃/40h

        3.2 Tensile strength rate(%)

        ≤ 30

        3.3 Elongation at break rate (%)

        ≤ 30

        4

        Heat extension test

        4.1 Test condition

        200±3℃/15min, stress0.2N/mm2

        4.2 Loading elongation rate(%)

        ≤ 100

        4.3 Un-loading elongation rate(%)

        ≤ 25

        5

        Insulation resistance constant

        5.1 K value at 20℃(MΩ–km)

        ≥ 2400

        6

        Water absorption determined by the capacitance method

        6.1 Increase in capacitance

        1 to 14 days (%)

        ≤ 10

        7 to 14 days (%)

        ≤ 3

        7

        Maximum material operating temperature

        90℃

        Polymer:  EPDM

        Standard No.:BS 7655-1.2


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