H - Electricity – 01 – B
Patent
H - Electricity
01
B
31/98
H01B 3/12 (2006.01)
Patent
CA 1078166
ABSTRACT OF THE DISCLOSURE 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 polyaryl- siloxane 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 sub- jected to a heat treatment at a temperature of at least 65°C, for a period of at least 10 minutes. An electrical heating element comprises a housing and an electric heating coil which is embedded in the composition wherein the ceramic and possibly oxide-ceramic material has been ground.
253704
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