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.
The ammonium cation is a positively charged polyatomic ion with the chemical formula NH 4 + .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.