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1.1��ܶȾ��ϩ��ϽM��

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1.2 PPR��ϽM��

PPR�ܵ�ȫ��III�͟oҎ(gu��)�۾۱�ϩ��.�ɱ�ϩ��wPropylene��ϩ��wEthene�ۺ϶��ɵĹ��(PolyPropyleneRandomCopdvmer)�Ǿ��o(j��)��ʮ��Hˮƽ��͹�(ji��)�ܭh(hu��n)��Ϯa(ch��n)Ʒ,��PPR�ܵ��һ�N��Ͳ��,��

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