Sternson.

Class [19]
Non-Metallic Building Material Products

Refractory cements; refractory materials in powder or mastic form for furnace structurers and for lining furnaces, brass pits and crucibles; acid-proof cements for building purposes; fire clay, fire resisting sand, fire resisting bricks, crushed fire resisting bricks, roofing cement; roofing materials, (not being paints) in liquid, mastic and fibrous form; coatings (not being paints) for the brickwork of boilers; coatings (not being paints) made of asphaltic emulsions; and compounds (not being glaziers putty) in mastic form for use in glazing windows, repairing cracked walls; pointing stone-work, filling in expansion joints and for similar building, constructional, and repairing purposes.