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PROGRESS THROUOH CHEMISTRY

VaiHAon.. inSifiica

Davison pioneered in the development of the first commercially useful silica gel more than three decades ago, and for years has been America's

leading producer. Silica gel, with its porous amorphous physical structure providing a surface area of 90,000 square feet per cubic inch, is a unique compound of

continuing importance and increasing application. Silica gel's most important properties are its ability to condense and retain condensable gases in

the porous structure and its regenerable nature through the application of heat or other elutriation methods. A wide variety of particle sizes, densities and adsorptive

capacities are available, each having been developed to meet specific application demands. Investigate Davison Silica Gel, now.

See your Davison Field Service Engineer or write for technical literature.

DAVISON CHEMICAL C O M P A N Y Division of W. R. Grace & Co.

Baltimore 3, Maryland Sales Offices: Baltimore, Md.; Chicago, III.; Columbus, Ohio;

Houston, Texas; New York, Ν. Υ.

Producers of: Catalysts, Inorganic Acids, Superphosphates, Triple Superphosphates. Phosphate Rock, Silica Sels, S'dicoftuorides:

Sole producers of DAY CO® Granulated Fertilizer.

ask for.

Davison Silica Gel for the dehydra­tion of air and gas.

Syloid® 308 . . . lacquer f lat t ing agent.

Syloid® AL-1 . . . prevents gas build­up in metallic paint.

Protek-Sorb® 121 . . . for Method II de­hydrated packaging.

Syloid® 162 . . . alkyd-urea varnish flatting agent.

Syloid® 244 superior I flatting agent in clear j a l k y d f inishes a n d oleoresinous varnish.

A U G . 2 7, 1956 C&EN 4 1 4 3

M Men,