Glass Consultant for Circular Sight Glass Plates according to and based on DIN 7080

Technical Properties

Water resistance according to DIN 12111 (ISO 719) Hydrolysis class 4
Acid resistance according to DIN 12116 Acid class 1
Alkali resistance according to DIN 52322 Alkali class 2

Bending tensile strength ≥ 160 N/mm² / 23,000 psi
Surface pressure stress ≥ 100–140 N/mm² / 14,500–20,000 psi
Parallelism ≤ 0.20 mm / 0.008 inches
T.W.B. Δ T 265 K
max. operating temperature 300 °C / 572 °F (short-term)

ACI Mica protected 320 °C / 608 °F

Flatness deviation in the sealing area at a diameter...

up to 100 mm ≤ 0.05
over 100 to 150 mm ≤ 0.08
over 150 to 200 ≤ 0.12
over 200 mm ≤ 0.15

Dimensional tolerances according to DIN 7080

Diameter:

up to 135 mm ± 0.5 mm
150 to 200 mm ± 0.8 mm
from 200 mm ± 1.0 mm

Thickness:

up to 20 mm +0.5 mm / - 0.25 mm
from 20 mm + 0.8 mm / - 0.4 mm