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Gutta-Percha Cement

This highly recommended cement is made by melting together, in an iron pan, 2 parts common pitch and 1 part gutta-percha, stirring them well together until thoroughly incorporated, rected in the next receipt. and then pouring the liquid into cold water. 2251. Cement for Uniting Sheet When cold it is black, solid, and elastic; but Gutta-Percha to Leather. For uniting it softens with heat, and at 1000 Fahr. is a sheet gutta-percha to leather, as soles of shoes, thin fluid. It may be used as a soft paste, or etc. Gutta-percha, 50 pounds; Venice turpenin the liquid state, and answers an excellent tine, 40 pounds; shellac, 4 pounds; caoutpurpose in cementing metal, glass, porcelain, chouc, 1 pound; liquid storax, 5 pounds. In ivory, &c. It may be used instead of putty for glazing windows. 2248. To Dissolve India Rubber for Cement, &c. India rubber dissolves readily in rectified sulphuric ether, which has been washed with water to remove alcohol and making the cement, the Venice turpentine should be first heated; then the gutta-percha and the shellac should be added; the order in which the other materials are added is not important. Care should be taken to incorporate them thoroughly, and the heat should be acidity; also in chloroform. These make regulated, so as not to burn the mixture. odorless solutions, but are too expensive for 2252. Transparent Cement. Dissolve general use. The gum dissolves easily in 75 parts India rubber in 60 parts of chloro- LUTE. form, and add to the solution 15 parts of tine must be added to the solution of caoutgum mastich.

2253. How to Fasten Rubber to Wood and Metal. As rubber plates and rings are now a-days almost exclusively used for making connections between steam and other pipes and apparatus, much annoyance chouc 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 suitais often experienced by the impossibility or ble vessel over a moderate coal fire, until the imperfectness of an air-tight connection. This caoutchouc becomes fluid; then add 1/2 pound is obviated entirely by employing a cement powdered resin, and melt both materials at a which fastens equally well to the rubber and moderate heat. When these materials are to the metal or wood. Such cement is pre- perfectly fluid, then gradually add 3 or 4 pared by a solution of shellac in ammonia. pounds spirit of turpentine in small portions, This is best made by soaking pulverized gum- and stir well. By the addition of the last shellac in ten times its weight of strong am- solution, the rapid thickening and hardening monia, when a slimy mass is obtained, which, of the compound will be prevented, and a mixture obtained fully answering the purpose in three to four weeks, will become liquid without the use of hot water. This softens of glueing together rubber surfaces, etc. the rubber, and becomes, after volatilization 2259. Το Fasten Chamois and Other of the ammonia, hard and impermeable to gases and fluids.

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, Leather to Iron and Steel. Dr. Carl W.

Heinischen, of Dresden, gives the following receipt for the above purpose: Spread over the metal a thin, hot solution of good glue; soak the leather with a warm solution of gall-nuts before placing on the metal, and leave to dry under an even pressure. If faswhen melted, adding 2 parts shellac, and tened in this manner it is impossible to sepamelting until mixed. Pour it while hot on rate the leather from the metal without tearmetal plates to cool. When required for use, use, ing it. melt, and apply with a brush. This cement does not adhere very well to vulcanized rubber, and the joint is always weak.