Ceramic Properties - Corning Pyrex (7740)
Pyrex is a Trade Name of Corning Inc. for their borosilicate glass. Borosilicate is known for its ability to withstand thermal shock, and thermal and electrical insulating qualities. Typical ceramic parts uses for this material include labware and many consumer glass products such as coffee pots.
Properties Units Test Value Physical Chemical Formula borosilicate glass Density, r g/cm3 ASTM C20 2.23 Color white/ transparent Crystal Structure random Water Absorption % @R.T. ASTM C373 0.0 Hardness Moh's -- Hardness knoop (kg/mm2) Knoop 100g 418 Mechanical Compressive Strength MPa @ R.T. ASTM C773 N/A Tensile Strength MPa @ R.T. ACMA Test #4 N/A Modulus of Elasticity
GPa ASTM C848 64 Flexural Strength (MOR) MPa @ R.T. ASTM F417 69 Poisson's Ratio, u ASTM C818 0.20 Fracture Toughness, KIc MPa x m1/2 Notched Beam Test 0.77 Thermal Max. Use Temperature
(* denotes inert atm.)
C No load cond. 490 Thermal Shock Resistance DT (C) Quenching 100 Thermal Conductivity W/m-K @ R.T. ASTM C408 1.1 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 3.25 (through 300C) Specific Heat, cp cal/g-C @ R.T. ASTM C351 0.18 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 4.6 Dielectric Strength kV/mm ASTM D116 0.5 Electrical Resistivity Wcm @ R.T. ASTM D1829 8 x 1010
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