Document ZnvywrRzByJ87o6mjvkGXyeyd

TZXTILii FI3iRJ AjbliOTOS UUST OdMUfAR OF T'JsSOAY. S?TS^BR 11. 1Q7T `.'he current .;tatus 'jf asbestos-free insulating materials continues to ;e uri^ntur, out the progress from your last mee ing, in July, 1972, nu:. Mien slow and |>ainfu.' . lu .'.ay rucull that at the time of the previous nee ting we had only two calcium silicate insulations that 'were asbestos-free and only one :f those was satisfactory for use on austenitic stainless steel. nt this timu, fortunately, all of the calcium silicateswe have listed :n an;'!nearing Jtandnrdc oNlOOM are asbestos-free. There are five orands of lode 102, the uninhibited calcium silicate, and two urarids which arc approvsd for Code 102.1 for use on austenitic atainiuss steel. Tl'.ure are two more trend:; that will be added to the Inhibited calcium silicate listings under Code 102.1 by the end of Jthis year. They are Johns-Manvilie*s Thermo-12 and fl&B Insulation, Inc's. "Pamsil", which is a du Pont development. This will help us considerably in getting back to our previous prin ciple of using only the inhibited brands for all applications to avoid field mix-ups. At the time of the last meeting, I was pushing a 'high quality mineral wool by the U. a. Gypsum Co., known as K-fac. This can be inhibited by the fabricator by dipping it in sodium silicati solution. DU 0913272 DU 030101 Asbestos Dus: Jeminar 1/1 i/73 II seems that ir.ic material took on so strong ir the asbestos-free calcium Silicate shortage,that U. S. Gypsum had to turn off their tneir .ndustnal tr.ernal insulation program. Thay were way oversold. J. ... aypuu.T. ia still supplying all the needs of their first two fabricators, at.as Insulation of Pittsburgh, Pa, and Starr-Davis of Dreunboro, N.C.; but they have stopped promotion to any other fab ricators . I'-t *.r.e to mention here that all of the minera, wool brands listed in lu hone's lodes ill and -.11.1 are asbestos f:ree. Jcuns-ianviilo still aot-s r. it nave an asbestos-free substitute for their '.irinito, whica iiTou Font's Code 130, Asbestos 3oard, and they i.iiia no hope lor one s.n th# foreseeable fuiure. There are r.o other manufacturers nroducts which even approach Marinites physical :r.ara .-toristics. Prom .;u Font's standpoint however, there are no needs where Marinite is the only material that will suit. We can and are engineering around this material. All of the Insulating Cements, Code 502, and Insulating and Finishing Cements, Cnle 5U2.1 listed in Engineering Standards are asbestos free. Our .;in/;J.e ^reabcr.t aubestos material problem at this time is finding an equivalent substitute for woven asbestos or "A" cloth. Gome of your people nave oeen helping the Thermal Insulation Standards DUP 0913273 Du 030102 J asbestos Dust beminar i/l i/73 .uocoinr.it.bee evaluate a product known as ''Pc-terlag" by the II. K. Sorter Jcmpany. lr. the-trad^ it is .<nown as a rewettabie (jlacs cloth. It is 1 -lass c_oth that is coatee witri a rewettaole adhesive oy the manu facturer (I have a oral! fitting cover that is covered with Porterlag No. 205, a i5 ounce treated glass cloth). These rewettabie cloths crust to crotecteti I'rom moisture or the adhesive will soften and cone loose. This rate rial is' useacle tn hot side temperature to 80CF. it -u .crtu-r.ly not t-quiva_er.t in strength or a buse resistance to ''A'1 c_oth, but ./hero piant rulings eliminate the us; of asbestos-bearing materials at .s our sect alternative so far. In summary, are in good shape for asbestos-free insulations and accessories with the exception of woven asbestos cloth and asbestos iist-ng tape. George 1. Lang/bla Jeptemoer 12, 1973 DU 091327* DU 030103