免费无遮挡无码视频在线观看,啪啪啪国产无码色五月婷婷视频,亚洲欧美综合精品成人网站,免费操她视频亚洲无码第1页,色亚洲欧洲第一页99国产永久免费,国产大片在线观看黄不卡,精品99久久九九91丰满视频一页,欧美成人r级在线观看,亚洲精品久久久久久

Your Current Position:  PRODUCTS > Gum Rosin series > Gum Turpentine

Gum Turpentine

a If necessary the color can be determined by Pt-Co scale, super grade 0~35 (including 35), WW grade 35~70 (not including 35, including 70)
a If necessary the color can be determined by Pt-Co scale, super grade 0~35 (including 35), WW grade 35~70 (not including 35, including 70)
b Pinene content is the total content of α-pinene and β-piene.
c The value of fraction volume distillated at 170℃ is described as %