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Pyrex sight glass is produced by high borosilicate material.

Borosilicate glass is a type of glass with the main glass-forming constituents silica and boron oxide. Borosilicate glasses are known for having very low coefficients of thermal expansion (~3 × 10−6 /°C at 20°C), making them resistant to thermal shock, more so than any other common glass. Such glass is less subject to thermal stress and can withstand the temperature fluctuations of the heated bed. Borosilicate glass is sold under such trade names as Kimax, Pyrex, Endural, Schott, or Refmex.

Size:Customized size availale

Physical Property
No.		Physical performance					Numerical Value	Unit
1		Coefficient of mean linear thermal expansion(20°C,300°C)					3.3±0.1	10-6K-1
2		Transformation temperature					525±15	°C
3		Softening point					820±10	°C
4		Working point					1260±20	°C
5		Density at 20°C					2.23±0.02	g/cm3
6		Mean thermal conductivity(20°C-100°C)					1.2	w/m2k
7		Refractive index					0.92	1
	Main Composition
	SiO2		B2O3	Na2O+K2O		Al2O3
	81		13	4		2
	Chemical Property
	Hydrolytic resistance at 98°C				ISO719-HGB 1
	Hydrolytic resistance at 121°C				ISO720-HGA 1
	Acid resistance Class				ISO1776-First Class

	Optical Property
	Refractive:				nd : 1.47384
	Light transmission:				92%thickness≤4mm91%(thickness≥5mm)