Joining, flanges and sealing
PTFE packing
Sealing a flanged joint at design pressure and temperature
Specialist selection guide
What should be reviewed before selecting this product?
PTFE packing belongs to the Gaskets and sealing systems family. Technical selection must start from actual service conditions, followed by verification of dimensions, pressure-temperature duty, material, connection, construction standard, testing and manufacturer documentation against the project piping class.
Technical selection path
- 1
Extract flange facing from the project specification and verify it against the manufacturer proposal
- 2
Extract class and size from the project specification and verify it against the manufacturer proposal
- 3
Extract temperature and fluid from the project specification and verify it against the manufacturer proposal
- 4
Extract filler and ring material from the project specification and verify it against the manufacturer proposal
- 5
Extract bolt load from the project specification and verify it against the manufacturer proposal
- 6
Extract thermal cycling from the project specification and verify it against the manufacturer proposal
Key strengths
- Selection within the established Gaskets and sealing systems family
- Compatibility review across project materials and connections
- Structured technical comparison before final enquiry
Selection limitations
- A trade name or product name alone does not define the technical specification
- Pressure-temperature limits depend on material, design and standard edition
- Substitution requires dimensional, functional and documentation verification
Typical applications
Where can this option be considered?
- Evaluation for Oil and gas projects subject to service-condition approval
- Evaluation for Refining projects subject to service-condition approval
- Evaluation for Petrochemical projects subject to service-condition approval
Reference standards
A standard does not replace the project specification
ASME B16.20Reference relevant to PTFE packing selection, dimensions, materials or testing; the required edition must be stated in the orderASME B16.21Reference relevant to PTFE packing selection, dimensions, materials or testing; the required edition must be stated in the orderAPI 6AReference relevant to PTFE packing selection, dimensions, materials or testing; the required edition must be stated in the order
Common technical questions
Concise answers before enquiry
What information is required to enquire about PTFE packing?
At minimum provide flange facing, class and size, temperature and fluid, filler and ring material, bolt load and fluid conditions. Final documentation requirements follow the project specification.
Are two PTFE packing products with the same name interchangeable?
No. Installation dimensions, pressure-temperature rating, wetted materials, connection, test method and material certification must be checked independently.
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