Document 82yRvqv3noa5yZyzVqL1jv7ad

FILE NAME: Kaiser Gypsum (KG) DATE: 1975 Nov 5 DOC#: KG080 DOCUMENT DESCRIPTION: Memo RE Substitutes for Asbestos in Plastic Cement KAISER CEMENT & GYPSUM CORPORATION INTER-OFFICE MEMORANDUM TO 0 . w. Post DATE November 5, 1975 C O P IE S TO Erwin G. B. Kirk J . F. Penne!1 J . I . Walker ^ I . M. Watson PROM R. E. Sharpe SUWECT SUBSTITUTES FOR ASBESTOS IN PLASTIC CEMENT (W/0 694-681) I talked with Mr. Nate Greening o f PCA in regard to any work they have done with materials to aid pumpability of p laster mixes. He mentioned the following materials they have t r i e d , some of which were either unsuccessful as a pumping aid or were deleterious to the physical properties o f the plaster. Paper Pulp Fiber Talc Mineral Wool Starch Polyox (pumpaid marketed by W. R. Grace) Methylcellulose plus Lime They found the best materials were paper pulp or mineral wool. Talc worked w ell, but i t is chemically close to asbestos. The other materials either entrained too much a i r , caused slow sets or reduced the a b i l i t y of the plaster to stick to the w all. He suggested that we try various proportions of expansive cement. They found that high C3A in cement would enhance the pumpability. Based on his recommendations I think we should try additions of small amounts o f expansive component and also run more tests with paper pulp and mineral wool. RES/lz rc m w 1 so LEV082203A-0064