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Electrical Contact Materials Electrical Contact Materials Item No.:   Parameter Name Proportion of Cr Proportion of Cu Density Hardness conductivity CuCr25 24-28% allowance ≥8.3g/cm3 ≥75HB ≥48IACS% CuCr30 28-32% allowance ≥8.2g/cm3 ≥75HB ≥44IACS% CuCr50 48-52% allowance ≥7.9g/cm3 ≥85HB ≥29IACS%

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