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Polyimide Ball, Pi Ball, Long Term Temperature Resistance Above 300 ° C, Replace Vespel Sp-1, Find Details and Price about Vespel Ball Vepel Sp-1 Ball from Polyimide Ball, Pi Ball, Long Term Temperature Resistance Above 300 ° C, Replace Vespel Sp-1 - Shanghai Shengjun Plastic Technologies Co, Ltd.