Document Vjw0zOd1Vv05a1R3Lx9678b3g

FILE NAME: WR Grace (WRG) DATE: April 19, 1977 DOC#: WRG 174 DOCUMENT DESCRIPTION: 1977 Memo to ES Wood from JC Yang regarding tremolite content in Zonolite products 02/12/1996 15:02 6173564987 CA M BR ID G E TO: E . S . W o o d from; J u l i e C. Yang C. Duecfcar H. A. Eschenbach F. W. Eaton. W. R. Hanlopr'C R. M. Vinlffe \ B. R* Williams J. W.>fslter SSHC PAGE 1 9 co n fid en tia l REC`0 A r 49897 OAT c SUBJECT: April 19, 1977 Tremolite Content in ZONOLITE Products C . C . Ou S. C. V a u g h a n F i l e : 71-01-6 O B JE C T IV E The objective of this study is to determine the tremolite content in all ONOLITE products made of both Libby ana Kearney vermiculites. In a few cases, repetitious analyses were made for product used on job-sites, so r that correlation can be made with the fiber counting results* ? * METHOD When tremolite is determined from the product as received, in most prodnets tremolite was not found by conventional analytical methods. The trace amount can be determined only when intensive concentration techniques are employed. Tremolite determinations are than made from the fractions by quantitative x-ray diffraction analysis =nd with the aid of petrographic microscopic examination. 1. Terra-Llte YermicuT ites , Verrtte, Red! -Z'T'-tis :and Metro-Mixes The schematic method of analysis and the results have been reported in T&A 50110 with limited distribution. They are also reported here as shown in schemes 1, 2, and 3. . 2. Scott Turf Builder The method of concentration was very similar to that of erra-Iiite Verraiculite scheme #1, except in the water flotation step. A longer soaKing period was needed to solubilize all the nutrients present, which was approximately 50<% of the-total weight. 3. ZIC, Attic Fill. Masonry Fill Same .concentration method as Terra-Lite (scheme #1). 150027*3 02/12/96 15:03 TX/RX NO.4725 P.018