High heat resistant oil-impregnatable electrical insulating boar

Details High heat resistant oil-impregnatable electrical insulating boar High heat resistant oil-impregnatable electrical insulating boar

1988-08-30

1989-12-12

Chin, Peter

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

162138, 162146, D21H 102, D21H 512

Patent

active

048865788

ABSTRACT:
A process for making a high heat resistant oil-impregnatable insulating board, having a dielectric constant less than 2.7, made from bleached polytetrafluoroethylene floc and aromatic polyamide fibrids and the resulting insulating board are disclosed.

REFERENCES:
patent: 3756908 (1973-09-01), Gross
patent: 4595457 (1986-06-01), Nishiyama et al.
"Advanced Concepts for Transformers Mechanical Strength", published Sep. 1981.
"Advanced Concepts for Transformers Pressboard Dielectric Constant and Mechanical Strength", Dept. of Energy Report, (Mar. 1982).
"Insulation System and Thermal Evaluation of Transformers Using High Thermal--Resistance Insulating Materials", Isole, Hitachi, Rev., vol. 26, (1977).

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