Z94.12.2 Foundry/Casting

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TALC. Hydrated magnesium silicate; it is soft, greasy to the touch and very pliable; widely used in parting compounds, core compounds, and in core paste; often called red talc or yellow talc.

TEMPER. (noun) The moisture content of a sand at which any certain physical test value is obtained, i.e., temper with respect to green compressive strength, permeability, retained compressive strength, etc.

TEMPER. (verb) Mixing sand with sufficient water or other liquid to develop desired molding properties.

TEMPER CARBON. The free or graphitic carbon that precipitates from solution, usually in the form of rounded or equiaxed nodules in the structure, during the graphitizing or malleabilizing of white cast iron.

THIXOTROPHY. In sand testing, the proportion of the volumes of liquid and solid matters which is required, one minute after shaking, for the suspension to just flow out of an 8-mm diameter test tube, when the test tube is changed from a vertical to a horizontal position.

TUMBLING. Cleaning castings by rotating them in a container in the presence of cleaning materials.

TUYERE. An opening in the cupola shell and refractory lining through which the air blast is forced.

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