Asbestos fabricating process and products thereof (US Patent 3,630,012, 1971)

Horst C. G. H. Guertler received US Patent No. 3,630,012 on December 28, 1971, filed November 26, 1968.

The patent's abstract:

A dispersion of chrysolite asbestos in water with soap as dispersion medium is given an addition of sharpening agent consisting of aluminum sulfate or other acidic soap-precipitant substance in a quantity below the threshold at which the precipitant causes coagulation of asbestos. Preferably the added quantity of sharpening agent is 20 to 80 percent of its threshold quantity. This, for example, amounts to 50-200 g. of aluminum sulfate per kg. of dry soap content in a 2 percent asbestos dispersion. The sharpening agent is added in such a manner as to prevent local or partial coagulation. This is done by first dissolving the sharpening agent in the water subsequently used for preparing the asbestos dispersion, or by dissolving the sharpening agent in water and stirring the solution into the previously prepared aqueous dispersion. The addition improves storability and extrudability of the dispersion as well as the tensile strength of the asbestos strand or yarn made therefrom.

Where it was listed

• Asbestos, June 1972, in its patents department (the year's issues)