Thermal treatment furnaces — Temperature > 850 °C and one dimension > 1 m,

Furnaces capable of operation at temperatures above 400 °C as follows: a. Oxidation furnaces b. Controlled atmosphere heat treatment furnaces Note: This item does not cover tunnel kilns with roller or car conveyance, tunnel kilns with conveyor belt, pusher type kilns or shuttle kilns, specially designed for the production of glass, tableware ceramics or structural ceramics.

Controlled atmosphere (vacuum or inert gas) induction furnaces, and power supplies therefor, as follows: N.B: SEE ALSO 3B. a. Furnaces having all of the following characteristics: 1. Capable of operation above 1 123 K (850 °C); 2. Induction coils 600 mm or less in diameter; and 3. Designed for power inputs of 5 kW or more; b. Power supplies, with a specified power output of 5 kW or more, specially designed for furnaces specified in 2B226.a. Note: 2B226.a. does not control furnaces designed for the processing of semiconductor wafers.

Controlled atmosphere heat treatment furnaces or oxidation furnaces capable of operation at temperatures above 400 °C. Note : This item does not cover tunnel kilns with roller or car conveyance, tunnel kilns with conveyor belt, pusher type kilns or shuttle kilns, specially designed for the production of glass, tableware ceramics or structural ceramics.

Thermal treatment furnaces — Temperature > 850 °C and one dimension > 1 m,

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