ASTM D6585 Specification for Unsintered Polytetrafluoroethylene (PTFE)
ASTM D6585 test method applies to unsintered extruded films or tapes made from virgin, unpigmented polytetrafluoroethylene with a nominal thickness of 0.025 to 0.51 mm (0.001 to 0.020 in.) and a PTFE content of >99 percent. The values stated in SI units are considered standard.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D6585 is a standard specification covering unsintered polytetrafluoroethylene (PTFE) materials. Unsintered PTFE is a form of the polymer that has not undergone the high-temperature sintering process used to fully coalesce the resin particles into a dense, solid structure, giving it unique mechanical and surface properties.
This specification defines the requirements, test methods, and classification of unsintered PTFE products used in sealing, gasketing, and thread sealing applications. Compliance ensures consistent performance in demanding chemical and mechanical environments.
Scope, Applications, and Benefits
Scope
ASTM D6585 addresses:
- Classification of unsintered PTFE by type and grade
- Physical and mechanical property requirements
- Test methods for conformance verification
- Dimensions and tolerances for unsintered PTFE products
Applications
- Pipe thread sealing tape (plumber’s tape)
- Chemical processing seals and gaskets
- Valve stem packing
- Laboratory and pharmaceutical fluid handling
- Electrical insulation and dielectric applications
Benefits
- Establishes consistent quality benchmarks for unsintered PTFE
- Ensures reliable sealing performance in chemical environments
- Supports material selection for pressure and temperature-rated systems
- Enables vendor qualification and procurement specifications
- Facilitates international trade and product standardization
Test Process
Sample Conditioning
PTFE specimens are conditioned at standard laboratory temperature and humidity as specified.
1Dimensional Verification
Thickness, width, and density are measured using calibrated instruments per specification requirements.
2Mechanical Property Testing
Tensile strength, elongation, and density are measured on conditioned specimens.
3Reporting
Test results are compared against specification limits and classified by type and grade.
4Technical Specifications
| Parameter | Details |
|---|---|
| Standard | ASTM D6585 |
| Material | Unsintered polytetrafluoroethylene (PTFE) |
| Measured Properties | Density, tensile strength, elongation, dimensional tolerances |
| Classification | By type and grade based on application |
| Conditioning | Standard laboratory conditions per ASTM |
Instrumentation Used for Testing
- Calibrated tensile testing machine
- Micrometer and dimensional measurement tools
- Analytical balance for density determination
- Environmental conditioning chamber
- Data recording and reporting system
Results and Deliverables
- Density and dimensional measurement results
- Tensile strength and elongation values
- Type and grade classification
- Conformance statement against ASTM D6585 limits
- Material qualification and certification documentation
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Frequently Asked Questions
Unsintered PTFE has not undergone the high-temperature fusion process, making it softer, more pliable, and conformable. Sintered PTFE is denser and harder, suited for structural applications.
The most common application is pipe thread sealing tape, widely used in plumbing and industrial pipe fittings to create leak-proof threaded joints.
Density affects the porosity, conformability, and sealing performance of unsintered PTFE. Specification limits ensure the material provides adequate sealing under compression.
Yes, PTFE in all forms—sintered and unsintered—offers outstanding resistance to nearly all industrial chemicals, acids, bases, and solvents, making it ideal for chemical processing seals.
Unsintered PTFE has a lower continuous service temperature than sintered PTFE and is generally recommended for moderate temperature applications. Specific service limits should be verified against the application requirements.
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