CEMENTS
(See also Putties.)
For Adhesive Cements intended for repairing broken articles, see Adhesives.
Putty For Celluloid.
Plumbers’ Cement.
Cement For Steam And Water Pipes.
Gutter Cement.
Cement For Pipe Joints.
Protection For Cement Work.
Cemented surfaces can be protected from the action of the weather by repeated coats of a green vitriol solution consisting of 1 part of green vitriol and 3 parts of water. Two coatings of 5 per cent soap water are said to render the cement waterproof; after drying and rubbing with a cloth or brush, this coating will become glossy like oil paint. This application is especially recommended for sick rooms, since the walls can be readily cleaned by washing with soapy water. The coating is rendered more and more waterproof thereby. The green vitriol solution is likewise commendable for application on old and new plastering, since it produces thereon waterproof coatings. From old plastering the loose particles have first to be removed by washing.
Puncture Cement.
To Fix Iron In Stone.
White Portland Cement.
Cement For Closing Cracks In Stoves.
Cement For Waterpipe.
II.—Mix 1 part, by weight, torn-up wadding; 1 part, by weight, of quicklime, and 3 parts, by weight, of boiled oil. This cement must be used as soon as made.
Cement For Pallet Stones.
Dental Cements:
Fairthorne’s Cement.
Huebner’s Cement.
As a binding liquid it is well to use acid-free zinc chloride, which can be prepared by dissolving pure zinc, free from iron, in concentrated, pure, hydrochloric acid, in such a manner that zinc is always in excess. When no more hydrogen is evolved the zinc in excess is still left in the solution for some time. The latter is filtered and boiled down to the consistency of syrup.
Commercial zinc oxide cannot be employed without previous treatment, because it is too loose; the denser it is the better is it adapted for dental cements, and the harder the latter will be. For this reason it is well, in order to obtain a dense product, to stir the commercial pure zinc oxide into a stiff paste with water to which 2 per cent of nitric acid has been added; the paste is dried and heated for some time at white heat in a Hessian crucible.
After cooling, the zinc oxide, thus obtained, is very finely powdered and kept in hermetically sealed vessels, so that it cannot absorb carbonic acid. The dental cement prepared with such zinc oxide turns very hard and solidifies with the concentrated zinc-chloride solution in a few minutes.
Phosphate Cement.
Zinc Amalgam, Or Dentists’ Zinc.
Sorel’s Cement.
Metallic Cement.
CEMENT COLORS: See Stone.
CEMENT, MORDANT FOR: See Mordants.
CEMENT, PAINTS FOR: See Paint.
CEMENT, PROTECTION OF, AGAINST ACID: See Acid-Proofing. {164}
CHAIN OF FIRE: See Pyrotechnics.
CHAINS (WATCH), TO CLEAN: See Cleaning Preparations and Methods.