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Optical Glass Properties

Soda lime float glass properties

Soda Lime Flat Float Glass Properties
Soda Lime Glass, also known as Float Glass contains both Sodium and Calcium, and is formed by drawing the glass over molten tin baths. The air side (facing up) is typically flatter and smoother than the tin side. Thin sheet glass is available in many standard thicknesses including .4mm, .55mm, .7mm, .9mm, and 1.1mm thick. Many of these are in stock from Valley Design. Thicker material is also available in various thickness ranging from 2.3mm all the way up to 19.1mm thick. Typical surface finish is 60/40 - 80/50 scratch/dig with flatness of 3-4 waves/inch. Valley can also lap and polish sheet material to custom thicknesses, and also improve the surface finish and flatness if required.

Principal Uses

Mirrors, microscopic slides, touch screens, filters, photomasks, glass masters,
data storage disks, printed circuit substrates, photographic plates, substrates,
wafers and optical windows

Thermal/Mechanical Properties

Thermal Conductivity: 0.937 W/mK
Density (at 20 °C/68 °F): 2.44 g/cm3
Hardness (Moh’s Scale): 6 – 7
Knoop Hardness: 585 kg/mm2 + 20
Modulus of Elasticity (Young’s): 7.2 x 1010 Pa
Modulus of Rigidity (Shear): 3.0 x 1010 Pa
Bulk Modulus: 4.3 x 1010 Pa
Poisson’s Ratio: 0.22
Specific Gravity: 2.53
Specific Heat: 0.21
Specific Weight: 2,483 g/cm3
Thermal Coefficient of Expansion (0/300 °C):
8.6 x 10 -6/°C
Softening Point: 726°C/1340°F
Annealing Range: 546°C/1015°F
Strain Point: 514°C/957°F

Optical Properties

Refractive Index (l=435): 1.523
Optical transmission

Chemical Properties

Hydrolytic resistance: class 3

Electrical Properties

Dielectric Constant: @ 20°C E= 7.75
Specific Resistivity: 1000 Hz 25°C – log R ohms/cm: 9.7
100°C: 91 – 250 °C: 6.5
60Hz 25°C: 11