Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1990-04-24
1992-01-21
Warden, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
374 57, 252 54, 568615, 568683, G01N 2500
Patent
active
050830821
ABSTRACT:
Perfluoropolyethers having an average molecular weight higher than 390 and respectively having a kinematic viscosity lower than 8.5 cSt (at 20.degree. C.), and such as to distill by not more than 10% at temperatures lower than 140.degree. C., and by at least 90% at temperatures not higher than 260.degree. C., or, in the case in which the perfluoropolyether does not contain CF (CF.sub.3) CF.sub.2 O units, having a viscosity lowr than 18 cSt (at 20.degree. C.), and such as to distill by not more than 10% at temperatures lower than 140.degree.C., and by at elast 90% at temperatures not higher than 280.degree. C., are used as the only high-temperature and low-temperature working fluid in the Thermal Shock Tests to which the electronic components are submitted, and at the same time are advantageously used in other tests used in the electronic industry, such as the Gross Leak Test and the Burn in Test, allowing the operators in this field to use only single fluid for a whole set of uses.
REFERENCES:
patent: 3214478 (1965-10-01), Milian
patent: 3242218 (1966-03-01), Miller
patent: 3665041 (1972-05-01), Sianesi et al.
patent: 3761808 (1973-08-01), Ryan
patent: 4523039 (1985-06-01), Lagow et al.
Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, pp. 505-519 Perfluropolyether Fluids for Vacuum Technologies; G. Caporiccio et al.
Technical Notes pp. 232-239 Compatibility Tests of Low-Vapor Pressure Perfluoropolyether Oils with UF6 by A. Ciancia et al.
Bargigia Gianangelo
Caporiccio Gerardo
Flabbi Luciano
Marchionni Giuseppe
Tonelli Claudio
Alexander Lyle
Montedison S.p.A.
Warden Robert J.
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