Insulating cements designed for trowel application after mixing with water to supplement  blocks or pipe sections and seal joints. Also applied where blocks/sections did not suit the site, such as irregular surfaces like valves, flanges and pipe fittings.

Primary application is not as a sealant. Refer Asbestos sealants information page. 

Hardie’s 85% Magnesia and High Temperature cements were manufactured with the same materials as the blocks/section products. 85% Magnesia contained 85-95% Magnesium Carbonate and 10-15% asbestos binder. Usually amosite asbestos with small amount of chrysotile asbestos.

High Temperature cement was composed of 12% amosite asbestos, 44% basic magnesium carbonate and 44% diatomaceous earth.