Home › Cements And Uniting Bodies › Cement for Petroleum Lamps

Cement for Petroleum Lamps

A cement particularly adapted for attaching the brass work to petroleum lamps, is made by Puscher, by boiling 3 parts resin with 1 cf caustic soda and 5 of water. The composition is then mixed with half its weight of plaster of Paris, and sets firmly in half to threequarters of an hour. It is said to be of great adhesive power, not permeable to petroleum, a low conductor of heat, and but superficially attacked by hot water. Zinc white, white lead, or precipitated chalk may be substituted 2256. Gutta-Percha Cement for Fastening Leather. Dissolve a quantity of gutta-percha in chloroform in quantity to make a fluid of honey-like consistence. for plaster, but hardens more slowly. When spread it will dry in a few moments. 2261. Cement for Attaching Metal Heat the surfaces at a fire or gas flame until Letters to Plate Glass. Copal varnish, 16 softened, and apply them together. Small parts; drying oil, 6 parts; turpentine, and. patches of leather can be thus cemented on oil of turpentine, of each 3 parts; liquefied boots, etc., so as almost to defy detection, glue (made with the least possible quantity and some shoemakers employ it with great success for this purpose. It is waterproof, and will answer almost anywhere unless exposed to heat, which softens it. of water), 5 parts. Melt together in a waterbath, and add fresh slacked lime (perfectly dry and in very fine powder), 10 parts.