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An expanding hot topping compound of extremely high insulation value
Extra HiBond Bentonite can be bought here
A tablet (or part of) is plunged into the metal using a "plunging tool" and held at the bottom of the crucible until bubbling ceases
For more information and dosage rates
Superwool Plus Ceramic Blanket - 610mm wide Copper Melting An expanding hot topping compoundDescription Superwool Plus blanket is manufactured from pure raw materials using a new manufacturing technology. In addition to enhanced thermal properties, large nuisance dust particles have been effectively eliminated making the product soft to the touch and less irritating during use. Superwool Plus Blanket is made of long Superwool fibres having the same chemical formulation as the original and well proven Superwool 607 fibre product. It exhibits