Document RJQyd8pYrpoO5pjZLpNOnwLmk

ro*K !**-* KUTIO 1 II.ut. ItftCP.Oi'HCE CORRESPONDENCE GAV Corporation PLAINTIFF'S EXHIBIT GF-926 FROM LOCATION F. S. Bettoli South Bound Brook r. C. Schvingcn T jjf.V 'Bound Lroolo DATE D. A. Davis Jan. 6, 1969 SUBJECT: CALSILITE - REDUCED DUSTIX- PROPERTIES For several months, we have been actively engaged in a Research program designed to reduce the diating tendency of Calsilite Calcium Silicate Thermal Insulation, There are two approaches to this problem. First we might^develop a means of post treating Calsilite after forming and curing to reduce the surface dusting. This means will allow us to treat the finished prodiet without affecting the critical gel rate or structure. However, it has the disadvantage of only protecting the formed surfaces. If any cutting is done after treatment, the cut surface will not he protected. Meat of our attention has been devoted to this approach. The following variations have bean tested* 1. Sodium Silicate (M. Brand) coating. Samples have bean dipped in various solution of sodium silicate. Samples dipped in m 1Q solution for 15 seconds and dried ehow slight imtiruw--rt ? in dusting. Samples dipped in 20f solution for 15 seconds and. dried showed noticeable reduction in dusting bat' a erased sill* cate surface coating was left which probably would be a sales disadvantage. 2. Silicone Solution - Samples were dipped in GE Silicone SN-2CQl|C 1'' 11 (2% solution) for 15 seconds and dried. No significant impronanent. 3. Nitric Acid Dip - Samples were dipped in 1/2% HNO3 solution for 15 seconds and dried. Slight iiaprovemeifc. h. SBR Latex - Samples were dipped in 20% TCD latex (B-10 Resin felt lalex SP-976 ) for 15 seconds and dried. A significant reduction in dusting resulted. This approach resulted in a "dustless" product. The disadvantage of this approach is that this is an organic coating. On a hot pipe it tends to discolor the insulation and until the coating is burned off, it creates an odor. Further work is being done. ro*n ]sii-Mi phhitco im u.s.a. INTEPpFRCE CORRESPONDENCE 6*F Corporation TS LOCATION' FROM LOCATION P. S. Fettoli South Bound Brook h. C. Schwinpcn. South Bound Brook 6 196date Jan. , ? SUBJECT: CAir.ILITE - RSDUSED nUSTT.~ rRO??PJrsS -- Page 2 With rsgcxd to the second approach of altering the product forra'lation, little work has been dene to date. A series of laboratory formulations have been made adding up to 2l TCD-SBR latex to the gel without success. It is very difficult to add anything to this formulation to change one property without affecting the gel formation Wiich usually increases product density and decreases product strength. We have and are continuing to consider the source and type of water, adjusting the line-silica ratio, adding silicones and the drying autoclaving cycles. VCS/bje V. C. Sehwlngen M1CH09193