a R E M A R K A B L E perform ance record indicates still greater potentials
COLUMBIA
product
* Trademark Registered U. S. Patent Office
Wartime needs, which have since continued to Silene EF production, limited quantities are availincrease, have confined the use of Silene EF prinable for experimental purposes. cipally to GR:S, GR:M and available natural You are invited to write for information conrubber stocks. The closest approach t o a "white cerning your proposed use and free working samples. carbon black," this precipitated, hydrated calcium silicate confers high modulus, hardness, tearApproximate Analysis: resistance and good tensile strength up to high CaO 19.0 loadings in both natural and synthetic rubbers. Si0 2 67.0 The characteristics of this product, particularly Loss on Ignition 14.0 its extremely fine particle size, indicate many other pH in water suspension 10.1 valuable uses. Among those already known is as Specific Gravity 2.10 an anti-caking agent in fine powders. Although Bulk Density 15 to 16 lb. per cu. ft. the requirements of the rubber industry continue Refractive Index 1.475 to utilize t h e majority of Columbia's expanded 1
COLUMBIA
CHEMICALS COLUMBIA
PITTSBURGH PLATE GLASS COMPANY COLUMBIA C H E M I C A L D I V I S I O N Boston • S t Louis
ESSENTIAL INDUSTRIAL CHEMICALS Soda Ash • Caustic Soda • Liquid Chlorine • Sodium Bicarbonate • Pittchlor ( C a l c i u m Hypochlorite) • Silene EF ( H y d r a t e d Calcium Silicate) • Calcium Chloride • Soda Briquettes • Caustic Ash • Phosflake • Calcene T (Precip-
F I F T H A V E N U E at BELUEFIELD, PITTSBURGH 13, PENNA. - Chicago Cincinnati • Cleveland • Philadelphia • Minneapolis • Charlotte • San Francisco itated Calcium Carbonate) • Modified Sodas. Pittsburgh • N e w York 3147 V O L U M E 2 4, N O . 2 3 » . D E C E M B E R 10, 1 9 4 6
