D. KASTEN and W. EDEN Bundesverband Kalksandsteinindustrie e. V., Hanover.

The DIN 106 method and apparatus for determining the frost resistance of calcium silicate facing units is described. Research at the Technical institute of the German Calcium Silicate Industry is examining the effects of varying the freezing temperature and cooling speed. Frost resistance can be improved by impregnation or coatings. A special apparatus has been developed to test this.