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http://www.stemmerich.com
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COMPARISON OF PHYSICAL PROPERTIES
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1/4" Materials
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°F
Normal Service |
°F
Extreme Service |
°F Max
Thermal Shock |
°F Max
Thermal Gradient |
In/In/°F
Coefficient of Thermal Expansion |
PSI
Design Tensile |
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VYCOR®
96% Silica Code 7913 |
1652
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2192
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1800
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396
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4.2 X 10-7
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1000
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Tempered
PYREX® Borosilicate Code |
500
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554
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580
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194
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18 X 10-7
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2000
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PRYEX®
Borosilicate Code 7740 |
446
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914
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270
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97
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18 X 10-7
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1000
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Soda-Lime
Tempered Code 0080 |
428
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482
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400
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88
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52 X 10-7
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3000
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Soda-Lime
Code 0080 |
230
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860
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90
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29
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52 X 10-7
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1000
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PYROCERAM®
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1202
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1382
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1400
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450
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3.3 X 10-7
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1500
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NORMAL SERVICE TEMPERATURE
No breakage from excessive thermal shock is assumed. Non-abused glass should last indefinitely. |
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EXTREME SERVICE TEMPERATURE
The glass will be very vulnerable to thermal shock and physical degradation. Recommendations in the range are based on mechanical stability considerations only. Test should be made before adopting final designs. |
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THERMAL SHOCK
The physical shock glass undergoes when evenly heated to the above listed temperature, then plunged into water at 50°F without breakage. |
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THERMAL GRADIENT
The difference in temperature between the two glass surfaces that will cause 1000 PSI tensile stress on the cooler surface. |
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COEFFICIENT OF THERMAL EXPANSION
The relative increase in size of a material when heated.. |