MAXOS®

Safety Sight and Level Gauge Glasses

SUPRAX® 8488

A high safety level is secured through the use of special borosilicate glass of high chemical durability, exceptional purity and homogeneity. The low thermal expansion of our SUPRAX® 8488 borosilicate glass, combined with thermal pre-stressing (tempering) creates a high resistance to sudden temperature changes.

Coefficient of expansion α 20 °C/300 °C 4.1 x 10–6K–1
Transformation temperature 545 °C
Glass temperature for the viscosities dPas (Poise) 1013.0 560 °C
107.6 800 °C
104.0 1210 °C
Density at 25 °C 2.3 g/cm3
Modulus of elasticity 67 x 103 N/mm2
Poisson‘s ratio μ 0.20
Thermal conductivity λ at 90 °C 1.2 W/(m·K)
Refractive index nd (λ = 587.6 nm) 1.482
Photoelastic parameter K 3.2 x 10–6 mm2/N
Chemical
characteristics
Hydrolytic
resistance
Acid
resistance
Alkali
resistance
Test acc. to DIN ISO 720 DIN ISO 1776 DIN ISO 695
max. abrasion
acc. to DIN ISO
0.1 <100 μg Na2O/dm2 >75–175 mg/dm2
MAXOS®
max. abrasion
0.050 <60 μg Na2O/dm2 >100 mg/dm2
MAXOS® HGA 1 Class A2

SUPRAX® - a registered trademark of SCHOTT AG

ADDITIONAL INFORMATION