Foundry Mold Insulating Coating

A molten metal mold having an active surface for contact by molten metal, said surface being coated by a non-crystalline and non-porous insulating coating, said insulating coating forms a thermal barrier to protect said metal mold, said coating comprising a suspension mix of:

• a quantity of a refractory glass that constitutes from 10.0% to 55.0% by weight of the suspension mix,
• said refractory glass being inert and nonreactive at the temperature of the molten metal to be cast and maintaining a brittle state at a temperature equal to the temperature of the molten metal being cast,
• a carrier liquid for suspending said quantity of refractory glass, wherein said carrier liquid and said refractory glass combined constitute at least 95.0% by weight of the suspension mix,
• wherein said refractory glass is nonporous to said carrier liquid, said carrier liquid is vaporizable at a temperature from 250° F. to 600° F.

A molten metal mold having an active surface for contact by molten metal, said surface being coated by a non-crystalline and non-porous insulating coating, said insulating coating forms a thermal barrier to protect said metal mold, said coating comprising a suspension mix of:

• a quantity of a refractory glass that constitutes from 10.0% to 55.0% by weight of the suspension mix,
• said refractory glass being inert and nonreactive at the temperature of the molten metal to be cast and maintaining a brittle state at a temperature equal to the temperature of the molten metal being cast,
• a carrier liquid for suspending said quantity of refractory glass, wherein said carrier liquid and said refractory glass combined constitute more than 95.0% by weight of the suspension mix,
• wherein said refractory glass is non-crystalline,
• said carrier liquid is vaporizable at a temperature from 250° F. to 600° F.

A molten metal mold having an active surface for contact by molten metal, said surface being coated by a non-crystalline and non-porous insulating coating, said insulating coating forms a thermal barrier to protect said metal mold, said coating comprising a suspension mix of:

• a quantity of a refractory glass that constitutes from 30%-45% by weight of the suspension mix,
• said refractory glass being inert and nonreactive at the temperature of the molten metal to be cast and maintaining a brittle state at a temperature equal to the temperature of the molten metal being cast,
• a carrier liquid for suspending said quantity of refractory glass, wherein said carrier liquid and said refractory glass combined constitute more than 95.0% by weight of the suspension mix,
• wherein said refractory glass is non-crystalline,
• said carrier liquid is vaporizable at a temperature from 250° F. to 600° F.