SCHOTT BOROFLOAT from Bes Optics, Inc. - Schott Borofloat is a highly chemical resistant borosilicate glass with a low thermal expansion used in laboratories, chemical plants, and in the home appliance and lighting industries.


		Schott Borofloat

For the first time, a highly chemical resistant borosilicate glass with a low thermal expansion is being manufactured by the float glass method. BOROFLOAT is a technologically significant development, achieving unsurpassed quality for flat borosilicate glass. It replaces TEMPAX, a drawn flat borosilicate glass. The high quality resulting from the float glass process opens up new applications for borosilicate flat glass, which has proven itself over time in laboratories, chemical plants, and in the home appliance and lighting industries.

BOROFLOAT flat glass is highly resistant to water: neutral, acidic, and saline solutions; as well as chlorine, bromine, iodine and organic substances. Even over long periods of time and at temperatures exceeding 100 degrees C, Borofloat exceeds the chemical resistance of most metals and other materials.


	Approximate Transmission Curve


	Optical Properties

Refractive Index n_d	1.472
Dispersion (n_F-n_c)	71.9 x 10^-4


	Thermal Properties

Linear thermal coefficient of expansion (20/300 C; 68/572 F)	3.25 x 10^-6/K
Transformation temperature Tg	530 C; 986 F
Upper cooling point (10¹³ dPa x s)	560 C; 1040 F
Thermal conductivity 90 C; 194 F	1.12W/(m . K)
Mean specific thermal capacity Cp (20/100 C; 68/212 F)	0.83 kJ/(kg . K)


	Maximum operating temperature (in consideration of RTD¹)

Short term	500 C; 932 F
Long term	450 C; 842 F


	Resistance to temperature differences ( RTD¹)

Short term exposure
(1 hour)	RTD = 110K
(1-100 hours)	RTD = 90K
Long term exposure
+/- 100 hours	RTD = 80K


	Resistance to thermal shock ( RTS²)

Thicknesses up to 4 mm	RTS = 175K
Thicknesses up to 4-6 mm	RTS = 160K
Thicknesses up to 6-15 mm	RTS = 150K


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