Nippon Carbon Co., Ltd.

Shinwa Chemical Industries Ltd.

Keiichi Hirata

Hiroshi Ichikawa

Akira Yokoyama

Hiroo Wada

Kenzo Kotera

An adsorption type packing for gas chromatography composed of finely divided carbon particles in whole, and having a ratio of nitrogen gas adsorption at a relative pressure of 0.3 (V.sub.0.3) to nitrogen gas adsorption at a relative pressure of about 1.0 (V.sub.1.0) each in the adsorption isotherm of said packing, V.sub.0.3 /V.sub.1.0, of 0.9 or more and a BET specific surface area of 1,000 to 2,000 m.sup.2 /g; and a process for producing said packing.

Adsorption type packing for gas chromatography and process for producing

Supports for gas chromatography comprising aggregates of finely divided carbon particles, said aggregates having a bulk specific gravity of 0.2 to 0.5 and a specific surface area of not more than 1.0 m.sup.2 /g and being produced by coating finely divided particles, such as carbon powder, having a diameter of 100 .mu.m or less and a content of particles having a diameter of 5 .mu.m or less of 20% or less, with a liquid thermosetting resin, and subjecting the coated particles to forming, curing, heat-treating, dividing and classifying; and a process for preparing said supports.

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Yokohama, Japan

Keiichi Hirata