2254. Marine Cement for Uniting Leather to Gutta-Percha

2254.      Marine Cement for Uniting Leather to Gutta-Percha. This will unite leather to gutta-percha, and is impervious to damp. It is made by dissolving by the aid of heat, 1 part India rubber in naphtha, and, when melted, adding 2 parts shellac, and melting until mixed. Pour it while hot on metal plates to cool. "When required for use, melt, and apply with a brush. This cement does not adhere very well to vulcanised rubber, and the joint is always weak.

2255. Cement to Unite India Rubber

2255.    Cement to Unite India Rubber. Take 16 parts gutta-percha, 4 parts India rubber, 2 parts common caulkers' pitch, 1 part Unseed oil. The ingredients are melted together, and used hot. It will unite leather or rubber that has not been vulcanized.

2256. Gutta-Percha Cement for Fastening Leather

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. "When spread it will dry in a few moments. Heat the surfaces at a fire or gas flame until softened, and apply them together. Small patches of leather can be thus cemented on boots, etc., so as almost to defy detection, 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.

2257. Caoutchouc Cement

2257.    Caoutchouc Cement is made as follows: - Gutta-percha, 3 parts; virgin India rubber (caoutchouc), 1 part (both cut small); pyrogenous oil of turpentine, or bisulphuret of carbon, 8 parts; mix in a close vessel, and dissolve by the heat of hot water. This cement should be gently heated before being used.

2258. Cement to Mend India Rubber Shoes

2258.    Cement to Mend India Rubber Shoes. A solution of caoutchouc, or virgin India rubber, for repairing India rubber shoes, is prepared in the following manner: Cut 2 pounds caoutchouc into thin, small slices; put them in a vessel of tinned sheet-iron and pour over 12 to 14 pounds of sulphide of carbon. For the promotion of solution, place the vessel in another containing water previously heated up to about 86° Fahr. The solution will take place promptly, but the fluid will thicken very soon, and thus render the application difficult, if not impossible. In order to prevent this thickening, a solution of caoutchouc and resin in spirits of turpentine must be added to the solution of caoutchouc in sulphide of carbon, and in such quantity that the mixture obtains the consistency of a thin paste. The solution of caoutchouc and resin in spirit of turpentine should be prepared as follows: Cut 1 pound of caoutchouc into thin, small slices; heat in a suitable vessel over a moderate coal fire, until the caoutchouc becomes fluid; then add 1/2 pound powdered resin, and melt both materials at a moderate heat. "When these materials are perfectly fluid, then gradually add 3 or 4 pounds spirit of turpentine in small portions, and stir well. By the addition of the last solution, the rapid thickening and hardening of the compound will be prevented, and a mixture obtained fully answering the purpose of glueing together rubber surfaces, etc.