Document K63N2OxnVokn5VE7doBvOYoKw

8-r. a--j u--y a r------ q if .c.i >. C '3 V 2 2 ^4 'o-'-t?) <7660/ February 29, 1972 Mr. H. V. Speicher, Administrator Headquarters Industrial Hygiene Westinghouse Electric Corporation 700 Braddock Avenue East Pittsburgh, Pa. 15112 Dear Mr. Speicher: Your letter of February 15th has been passed along to me for answering. To begin with, we are the only manu facturer of a calcium silicate thermal insulation to have replaced agbpscos ll&res as the relnforcing~agent. Since September of 1^7^. all rabco Super Caltemp Type * NA manufactured has been asB^sLos-free. ' Ve use a natural (not calcined) diatomaceous earth in our process. There is no crystalline, crystobalite or tridymite silica present. Although we use natural (Jlatusac'eous earth in our manufacturing process, the final product (Super Caltemp^ is a calcium silicate - with neither free lime nor earth present ^ -- --------- yi.t0/*/9 We do not now manufacture Prasco. Super Caltemp, Type 1200 NA is made in pipe covering, blocks, elbows and cement8. ftatiSB Please let me know if there is any additional informa tion we can supply you. Yours very truly, HPH:H5 H. P. HoopeTj Technical Director tabco Industrial Products Fibreboard Corporation 1710 59th Street P.O. Box 8301 Emeryville, California 94608 415/362-6900 MHBB-0038112