THE PREPARATION OF PLASTIC MASSES ^ROM CASEIN. 99 



mixture with caoutchouc or resin, to form a homogeneous 

 mass, and when resin is used the product may serve as a 

 rubber substitute. It may be further incorporated with other 

 ingredients used in the rubber industry, such as litharge, 

 chalk, lime, pitch or other colouring material. The final 

 product is employed in the manufacture of imitation rubber 

 goods by moulding and drying, and it may also be vulcanised 

 with sulphur, no matter whether raw or sulphonated oil has 

 been used. 



ANTI-RADIATION AND ANTI-CORROSIVE COMPOSITION. 



To prevent loss of heat by radiation in steam pipes, these 

 conduits may be coated with one or two layers of a mixture 

 of 10 parts of casein and 25 parts of Portland cement and 

 water-glass, the whole being stirred together and thinned 

 down to a workable consistency with water. Asbestos may 

 also form part of the composition, or the pipes may be wrapped 

 with asbestos rope before the second coating has dried. On 

 account of its constitution and consistency, the composition 

 may be regarded as a plastic mass rather than a paint. 



DICKMANN'S COVERING FOR FLOORS AND WALLS. 



Paper, peat or other vegetable or animal fibres, or cellulose, 

 asbestos and the like, may be rolled into sheets and mixed to 

 a pulp or sheets with oxidised linseed oil metallic oxides, 

 casein dissolved in ammonia, alum, iron sulphate, water-glass, 

 resins, paraffin, wax, salt, glue, gelatine, potassium chro- 

 mate, rubber, flour, ammonium cuproxide, formaldehyde, or 

 mixtures of two or more of these substances. The under 

 side of the sheet may be fitted with projections ; or holes or 

 hollow cavities or cells can be arranged inside the sheet. 

 These spaces may be tilled with peat, sawdust, rubber, cork, 

 linoleum, leather, or other sound-deadening material that is 

 elastic and non-conducting ; or compressed-air chambers may 



