BCS #1089 is a cut to size, high temperature, electrical insulating board made from Transite©-HT. It is used to support the electrical feed thru bolts in heat treat ovens and furnaces.
If you are building a knife heat treat furnace as shown in the British Blades forum, then you will be interested in this insulating board. It's rated at 600 F and is a 1/2" thick cement composite material. It's easily drilled, cut, sanded or machined. It is also very rigid and can stand a lot of compression load, so you can mount the feed thru bolts securely. These feed thru bolts are used to carry the electrical power from the outside of the furnace into the hot chamber. On the inside the bolts are used with washers & nuts to connect to the ends of the heating element.
This board is pre-cut to 5" x 7". You can drill the holes as required for your design with ordinary drill bits and a hand drill. The board can be mounted to the furnace shell with nuts & bolts, sheet metal screws, or by bonding with our #1087 / #1088 Element Adhesive.
If you need a different size for your project give us a call and we will be happy to quote it for you!
Here's the article from the British Blade Forum on building an electrical heat treat furnace: HT-Furnace Paper. Note in the paper the author calls the material "Tuffnol Insulation Board".
These two photos (from the British Blade Paper) show the idea of how the board is used:
The left photo shows the board mounted to the rear of the furnace, with 2 bolts connected to the power wires.
The right photo shows the inside of the furnace with the bolts protruding in and connected to the heating elements. The bolt towards the bottom is the one that connects the elements in series, and does not go thru to the outside.
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Revised: 1-10-10
