Synthetic Fibre / NBR Binder Soft Gasket Material · 2.0 mm
DVGW
WRAS
TA-Luft
TZW W270
EU 1935/04
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Note: Data shown are typical laboratory results provided as non-binding guidance. Max temperature and max pressure ratings are not for simultaneous use; allowable pressure decreases as temperature increases.
FLEXSEAL PRO 350 is a soft gasket material based on synthetic fibres, NBR binder and special fillers. Specially developed for demanding applications where only low bolt loads are permissible and flange irregularities need to be compensated. With 25% compressibility, the material conforms easily to uneven or damaged flange surfaces — it can be bent and shaped during installation without cracking or loss of integrity.
Antistick treatment on both sides prevents adhesion to flanges and eases maintenance. Optimized for hydrogen and light gases. Key approvals for gas, water and emissions-related service: DVGW, WRAS, TZW W270, EU 1935/04, TA-Luft.
Media & Applications
Hydrogen & light gases
Oils
Solvents
Low bolt load flanges
Irregular / damaged flanges
Emission-controlled service
Technical Properties
Property
Value
Technical Meaning
Approvals
Gas · Water · Emissions
DVGW · WRAS · TA-Luft
Key approvals for gas, water and emissions-related service.6
Max. Service Temperature
Continuous: 250°C · Steam: 200°C
350°C
Short-term peak 350°C; Continuous 250°C; Steam up to 200°C.2
Surface Finish
Both sides
Antistick both sides
Special surface treatment prevents adhesion to flanges and eases maintenance.
Material Composition
Synthetic fibres, NBR binder & special fillers
Structure specially designed for low bolt loads & irregular flanges.5
Material Density
1.5g/cm³
Standard density for soft synthetic fibre gasket material (DIN 28090-2).
Max. Operating Pressure
100bar
High pressure capability for demanding industrial applications.3
Specific Leak Rate
ASTM F146 / DIN 3535-6
0.009mg/s·m
@ 2.0 mm
Low leak rate for emission-controlled service.7
Thickness Increase
ASTM F146 · Oil IRM 903 / Fuel B
Oil 2% Fuel 6%
Oil IRM 903 (150°C, 5h) / Fuel B (23°C, 5h).7
Tensile Strength
ASTM F152
6MPa
Optimized for conformability rather than high tensile load.4
Compressibility
ASTM F36
25%
High compressibility allows sealing of uneven or damaged flanges.1
Elastic Recovery
ASTM F36
64%
Excellent recovery ensures seal integrity under thermal cycling.1
Residual Stress
DIN 52913 · 175°C / 16h
30MPa
Retains sealing force under heat and load, reducing re-torque needs. 20 MPa at 300°C.5
Certifications & Approvals
Gas & Water
Gas (Germany)DVGW DIN 3535-6
WaterTZW W270
Water (UK)WRAS
Food & Standards
Food contactEU 1935/04
Standard Supply Data
Sheet Sizes
1500 × 1500 mm
Also 3000 & 4500 mm lengths
Thickness (nominal)
0.5 / 1.0 / 1.5 / 2.0 / 3.0 mm
± 10% >1mm · ± 0.1mm ≤1mm
Colour
Yellow
Brand standard
Surface Finish
Antistick — both sides
Minimizes flange adhesion
Test Standards & Notes
1
ASTM F36: Standard test for Compressibility & Recovery