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PU basically consists of two raw materials, isocyanate and polyol, which are obtained from crude oil. Mixing the two process-ready, fluid-system components – which contain various auxiliary materials such as catalysts, foaming agents or stabilisers – gives rise to a reactive compound. Depending on the formula and proportions of the mix, the properties of the polyurethane produced can be precisely regulated – hard, soft, integral, cellular (foamed) or compact.

polyurethanes/Isocyanic acid/75-13-8

平行进口常识

选购常识:什么是平行进口?

在跨境业务火热的时代背景下，平行进口已十分常见。但大家也许对这个名词不太熟悉，这里就以网易考拉海购为例介绍以下平行进口电商。网易考拉海购是一家典型的平行进口电商。

平行进口商品是否需要缴税

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购买平行进口商品注意事项

蚂蚁淘自成立以来，坚持“正品行货，厂家直发”对假货零容忍的理念；蚂蚁淘海购每一件商品都通过正规的清关渠道，严格执行国家相关海关进口法律法规，严格把关品质，建立海外直采、报关清关，保障正品，保障品质，假一赔十，杜绝一切假货，让您无忧购物...

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