Joining, flanges and sealing
Non-metallic flat gasket
Sealing a flanged joint at design pressure and temperature
Specialist selection guide
What should be reviewed before selecting this product?
A nonmetallic flat gasket serves compatible flange facings within suitable pressure-temperature limits. Sheet material, thickness, compressibility, chemical resistance, bolt load and facing require combined review.
Technical selection path
- 1
Define flange facing and dimensions
- 2
Match gasket material to the fluid
- 3
Review pressure, temperature and thermal cycles
- 4
Control thickness and bolt load
- 5
Specify surface condition and tightening method
Key strengths
- Material variety for many services
- Simple cutting and supply in common sizes
- Suitable for many utility duties
Selection limitations
- Creep and load loss at elevated temperature
- Sensitive to incorrect bolt loading
- Not suitable for every facing and class
Typical applications
Where can this option be considered?
- Water and utilities
- Chemicals compatible with the sheet
- Permitted flat- or raised-face joints
Reference standards
A standard does not replace the project specification
Common technical questions
Concise answers before enquiry
Does a thicker gasket seal better?
Not necessarily. Extra thickness can increase creep and blowout sensitivity. Thickness must follow joint design.
Can a flat gasket be reused?
A compressed gasket is generally not reliable for reuse and should be replaced under the maintenance procedure.
Detachable joints with defined facing and bolt load
Chemical compatibility, temperature, facing, compression and reuse prohibition
Initial review sheet
Technical attributes to review
Final values must come from project specifications, calculations and manufacturer data. This table defines the information scope.
FamilyGaskets and sealing systems
Main groupJoining, flanges and sealing
Materials to evaluateGraphite, PTFE, Compressed fibre, Stainless steel, Nickel alloy
Connections to evaluateRaised face, Flat face, Ring-type joint
Typical mediaProcess, Steam, Gas, Chemicals
Relevant industriesOil and gas, Refining, Petrochemical, Power generation, Water and utilities
Reference standardsASME B16.20 · ASME B16.21 · API 6A
Enquiry checklist
Include this information with your request
Flange facing
Class and size
Temperature and fluid
Filler and ring material
Bolt load
Thermal cycling
Before substitution
A matching name does not guarantee interchangeability
Installation dimensions, pressure rating, wetted materials, sealing design, construction standard, testing and documentation must be checked independently.
Adjacent types
Other options in this family
Final technical approval is required
This page is educational and intended for initial screening. Final selection must be approved against project requirements, actual service conditions and manufacturer documentation.
Send request for review