Tempered borosilicate glass sight glass

Tempered borosilicate glass sight glass

Tempered borosilicate glass sight glass, also known as tempered sight glass, toughened glass sight glass, toughened borosilicate glass, or high borosilicate glass sight glass, the material is 3.3 high borosilicate glass.

Material: 3.3 high borosilicate glass (BOROSILICATE, PYREX7740, etc.)

Implementation standard:

Foreign standards: DIN7080-2005, DIN7081-1996

Physical and chemical properties:

Density: 2.23±0.02g/cm3

Mohs hardness: 7---7.5

Young's modulus: 64kN/mm3

Poisson's ratio: 0.2

Bending strength: 25Mpa

Knoop hardness; 480

Thermal expansion coefficient: (0-300℃)(3.25±0.1)×10-6K-1

Softening point: 820±10℃

Strain point: 518±10℃

Transition temperature: 525±10℃

Annealing point: 560±10℃

Melting point: 1270±10℃

Heat capacity: (20-100℃)0.83KJ×(㎏×K)-1

Thermal conductivity: 1.12W×(m×K)-1

Thermal shock resistance: 180K, after tempering treatment>300K

Temperature difference performance on the same sheet: 00K, after tempering treatment>300K

Maximum operating temperature: short-term (10h) 450℃

Water-resistance (ISO 719, DIN12111) Class 1

Acid resistance (ISO 1776, DIN12116) Class 1

Alkali resistance (ISO 695, DIN52322) Class A2

Refractive index: 1.47140

Transmittance:>92%

Abbe's constant: 65.41

Dispersion: 71.4*10-4

Stress Optical Coefficient: 4.0*10-6mm2N-1

Resistivity: 250℃ 8.0Ω*cm 350℃ 6.5Ω*cm

Dielectric constant 25℃, 1MHZ 4.6

Leakage constant 25℃, 1MHZ 37*10-4

Applications: pressure vessel sight glass, liquid level gauge glass, various high-temperature observation windows, pipe sight glass, etc.

Main manufacturers: Xinxiang Xinbo quartz glass product Co., LTD.

landlee@sightglassfactory.com