久久视频精品,久久视频在线,久久久久久美女精品啪啪,福利99,99国语露脸久久精品国产ktv,国产精品久久久久久在线,久久久久久久国产精品

The single ended active H of the single-ended polydimethylsiloxane can be directly grafted the high molecular or low molecular compound to reform a new type silicone product.

The intermediates of hydrosilylation，used to make all kinds of linear modified silicone oil.

The intermediates of hydrosilation,which is used to produce all kinds of reactive linear modified silicone oil