CRS offers five different kinds of glass or quartz wool, for nearly all chromatographic needs. These are specially recommended for use in injection liners, and as end plugs in packed columns. Untreated - soft, fine-denier Pyrex® wool. Silane Treated - treated with trimethylchlorosilane (TMCS) to yield an inert material for all-around use. Phosphoric Acid Treated - recommended for analysis of acidic compounds such as free acids, phenols and glycols. HMDS Treated - a superior method of deactivation, using hexamethyldisilazane. Pesticide Grade. 10 g. Quartz Wool - made from high-purity quartz with low metal-oxide impurities. Ideal for use with injection port liners.