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| Porcelain Crucibles / Labware |
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Chemical Porcelain Ware Properties |
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| Thermal-Shock Resistance | |
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Average coefficient of expansion from 20° C to 200° C is 3.56 x 10-6, gradually increasing to 4.69 x 10-6 at 1000° C. Experience has indicated suitability of particular shapes for specific uses. It remains the responsibility of the user to determine the suitability for his use. To prevent thermal stress cracks on porcelain ware, CoorsTek strongly recommends a heating / cooling rate not to exceed 200° C/hour. High-alumina labware temperature change rate should not exceed 150° C/hour. |
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| Prolonging Labware Life | |
| • Follow gradual heating and
cooling rates. • Use an oven or hot plate as an intermediate step when quicker heating/cooling rates are required. • Gradually increase flame intensity when using a gas burner. • Avoid contact of heated ware with a cold surface. • Carefully inspect your labware prior to each use. • Do not use any product that appears defective |
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| Hardness: 57.5 on the Rockwell 45N scale | |
| Fusion point: 1670° C (3038° F) | Softening point: 1400° C (2552° F) |
| Limit of use, unglazed: 1400° C (2552° F) | Limit of use, glazed: 1150° C (2102° F) |
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Limit of use, evacuated: 1300° C (2372° F) |
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