Dyneema Â® SK60 is the only super-fiber with a density below 1.0 (the fiber can float on water). The specific gravity of Dyneema Â® SK60 is 0.97, which is the lowest value among super fibers and is lighter than water.
Benzalkonium chloride is a quaternary ammonium compound and is used as a preservative in many ophthalmic solutions. Typically in dilutions of 0.01% or less.lkyl triethanol ammonium chloride, benzethonium chloride, CETRIMIDE (cetyltrimethylammonium bromide), DYMED and POLYQUAD are also examples of quaternary ammonium compounds that are used in ophthalmic preparations.
It is formed by the protonation of ammonia (NH 3). Ammonium is also a general name for positively charged or protonated substituted amines and quaternary ammonium cations (NR 4 +), where one or more hydrogen atoms are replaced by organic groups (indicated by R).n example of a reaction forming an ammonium ion is that between dimethylamine, (CH 3) 2 NH, and an acid, to give the dimethylaminium cation, (CH 3) 2 NH + 2 : Quaternary ammonium cations have four organic groups attached to the nitrogen atom. They lack a hydrogen atom bonded to the nitrogen atom.