Refractory granular embedding composition for electric heating c

Details Refractory granular embedding composition for electric heating c Refractory granular embedding composition for electric heating c

1976-04-05

1978-07-18

Pitlick, Harris A.

Electric heating

Heating devices

With heating unit structure

174118, 219548, 252 632, 252 635, 252 637, 252194, 338238, H01B 346, H01B 312, H05B 348, H05B 318

Patent

active

041017609

ABSTRACT:
A refractory, granular electrically insulative composition useful as an embedding composition for electric heating coils comprises fused and granulated, possibly ground, difficultly fusible, ceramic and possibly oxide-ceramic material having polyalkylsiloxane, e.g. polymethylsiloxane, or polyarylsiloxane admixed in a proportion of from 0.5 to 5.0% added weight. Use of the composition is suitable with tubular heaters which have been produced with it and which, after manufacture and before being brought into use, have been subjected to a heat treatment at a temperature of at least 65.degree. C, for a period of at least 10 minutes. An electrical heating element comprises a housing which is embedded in the composition wherein the ceramic and possibly oxide-ceramic material has been ground.

REFERENCES:
patent: 2669636 (1954-02-01), Rawles
patent: 2684428 (1954-07-01), Bixler
patent: 2802896 (1957-08-01), Tierman et al.
patent: 3726713 (1973-04-01), Hawk et al.

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