Use of perfluoropolyethers in mechanical pumps

Details Use of perfluoropolyethers in mechanical pumps Use of perfluoropolyethers in mechanical pumps

1986-11-14

1988-06-28

Dixon, Jr., William R.

Compositions

Electrolytes for electrical devices

252 58, C10M10738

Patent

active

047537442

ABSTRACT:
A process for the generation of vacuums .ltoreq.5.10.sup.-4 torr by means of mechanical pumps, comprising using as operative fluid a perfluoropolyether having neutral end groups and containing light products, having an average molecular weight equal to or lower than 1,000, in amounts lower than or equal to 50 ppm.

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patent: 4523039 (1985-06-01), Lagow et al.
patent: 4657687 (1987-04-01), Caporiccio et al.

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