Description
PYREX® code 7740 glass is a borosilicate composition that is used to provide unique chemical, thermal, mechanical and optical properties. Because of its borosilicate composition, PYREX code 7740 brand glass resists attack by all acids except hydrofluoric and hot phosphoric.
The low coefficient of thermal expansion of PYREX code 7740 glass allows it to withstand higher temperatures and temperature excursions than ordinary window glass. The spectral band width of PYREX code 7740 brand glass is greater than soda lime glass resulting in higher transmissions of both infared and ultraviolet energies. These properties enable it to provide long service and fulfill requirements which common window glass cannot meet.
Availability
Rolled
Thickness Tolerance
3/8 in. (+/- 1/32 in.)
5/8 in. (+/- 3/64 in.)
7/8 in. (+/- 3/64 in.)
1 3/8 in. (+ 1/8 in.; - 1/16 in.)
2 1/4 in. (+/- 1/4 in.)
**Alumatic,Inc. has the capability to grind and polish the above rolled materials to any thickness desired in the above range to a tolerance of ±.002".
Properties:
Refractive Index: nd (lambda = 588nm) = 1.473
Mechanical and Thermal
Density: 2.23g/cm3
Thermal Coefficient of Expansion:
(0-300 C) = 32.5 x 10-7
Applications:
PYREX code 7740 can be used as a neutron absorber in poison rods and raschig rings. Tempering 7740 glass enables it to withstand tension stresses of 3000 psi and increases its thermal shock resistance as well.
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