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 20º C/68 ºF): 2.23 g/cm³

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

Strain Point: 510°C/950°F

Annealing Point: 560°C/1040°F

Softening Point: 821°C/1509.8°F

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