MAXOS®
Safety Sight and Level Gauge Glasses
The specially developed SUPRAX® 8488 borosilicate glass used for the MAXOS® sight glasses guarantees a superior chemical resistance. The low expansion of the glass combined with thermal prestressing creates a high resistance to sudden temperatures changes.
| Technical properties | |||
|---|---|---|---|
| Coefficient of expansion α 20 °C/300 °C | 4.1 x 10–6K–1 | ||
| Max. operating temperature | 300 °C | 572 °F | |
| Thermal shock resistance as per ISO 718 | ΔT 230 °C | ||
| Transformation temperature | 545 °C | ||
| Glass temperature for the viscosities dPas (Poise) | 1013.0 107.6 104.0 | 560 °C 800 °C 1,210 °C | 1,040 °F 1,472 °F 2,210 °F |
| 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 | ||
SUPRAX® - a registered trademark of SCHOTT AG
It depends on the proportion: The high amount of silicon dioxide (SiO2) and boric acid (B2O3) characterizes this type as a glass former. The proportion of boric acid influences the glass properties in a specific way: We use a proportion of only 11.5 %. This makes it more stable in comparison to glasses with an even higher boric acid content. In addition, the embedding in the structural network ensures extremely high chemical resistance.
The homogeneous distribution of the thermal prestressing ensures increased breaking strength.
| 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 |
Abrasion of MAXOS® glass in aqueous phase at different temperatures as a function of the ph-value.
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