Application
Properties
Application
- Sealmax Style 940D – Diffusion barrier envelope is a multi-layer PTFE envelope gasket designed to prevent chemical diffusion, permeation and wicking into the gasket core.
- The construction incorporates an additional high-density PTFE diffusion barrier layer, offering superior sealing integrity compared to standard PTFE envelope gasket.
- Style 940D is widely use in applications like highly aggressive and permeating chemical media, vacuum and pressure services, toxic, hazardous or high-purity processes.
- It is used in industries like Chemical, Pharma, Petrochemical, Fertilizer, Food & Beverages
Properties
- Excellent chemical resistance.
- Very low permeability
- Prevents core contamination and media attack
- Non-stick, low friction surface
- Long service life.
- Food Grade
|
Technical Specifications
|
||||
|
SR.NO.
|
PROPERTIES
|
UNIT
|
Test Method Reference
|
Specified Values
|
|
1.
|
Density
|
gm/cm3
|
ASTM D-792
|
2.15 – 2.30
|
|
2.
|
Tensile Strength (Min.)
|
Mpa
|
ASTMD-638
|
20 – 30
|
|
3.
|
Hardness
|
–
|
Shore D
|
60
|
|
4.
|
pH range
|
–
|
–
|
0- 14
|
|
5.
|
Maintenance factor (m)
|
–
|
–
|
2.5
|
|
6.
|
Seating stress (y)
|
–
|
–
|
1800 psi
|
|
General Specifications
|
|||
|
SR.NO.
|
Parameters
|
Specifications
|
Remarks
|
|
1.
|
Material
|
100% Virgin PTFE
|
–
|
|
2.
|
Colour
|
White
|
–
|
|
3.
|
Operating Temperature
|
Max 260⁰ C
|
–
|
|
4.
|
Pressure range
|
Upto 60 bar
|
Depends on insert and service conditions
|
|
5.
|
Size range
|
DN 15 to DN 600 and above
|
Customized sizes on request
|
|
6.
|
Available forms
|
Slit Type, Mill Type and Fused Type
|
–
|
|
7.
|
Available thickness
|
0.5mm to 6.0mm
|
Customized on requests
|
|
8.
|
Available inserts
|
CNAF, Rubber, Graphite, SS corrugated
|
Customized insert on request
|