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G. Finkenbeiner Inc. 33 Rumford Ave Waltham, MA 02453. Telephone: (800)552-6182, 781-899-3138. Fax 781-647-4044

Properties of Pyrex 7740

Density (at 20 C/68 F): 2.23 g/cm

Thermal Coefficient of Expansion (0/300 C): 32.5 x 10-7/C

Strain Point: 510C/950F

Annealing Point: 560C/1040F

Softening Point: 821C/1509.8F

Optical Properties: Refractive Index(l=589.3nm): 1.473 Optical transmission

Chemical Properties Hydrolytic resistance: class 1 Acid resistance: class 1 Alkali resistance: class 2

Electrical Properties: Dielectric Constant: E= 4.6