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D6040-18 – Standard Test Method Technical Guide
ASTM D6040-18 (Reapproved 2023) provides a comprehensive guide to the standard test methods required for evaluating unsintered polytetrafluoroethylene (PTFE) extruded film or tape. This guide centralizes the applicable ASTM standards for mechanical, electrical, and physical property testing, including critical equivalencies to ISO 12086-2:2006.
📐 Material Forms and Terminology
ASTM D6040-18 provides precise definitions for the unsintered PTFE material forms under evaluation, ensuring clear communication between testing protocols and manufacturing specifications.
| 🟦 Term | 📐 Definition (Clause 3) |
|---|---|
| Film | Full-width material received as finished film. |
| Tape | Material that has been slit from the finished film. |
| Lot | One production run, or uniform blend of two or more production runs. |
Per Section 4, the required number of test specimens for any specific evaluation must follow the detailed requirements of the referenced individual test methods (e.g., D882, D149).
⚙️ Core Referenced Test Procedures
This guide serves as a centralized roadmap identifying the appropriate ASTM test methods for evaluating unsintered PTFE film and tape.
- Mechanical: D882 (Tensile Properties of Thin Plastic Sheeting).
- Electrical: D149 (Dielectric Breakdown), D150 (AC Loss / Permittivity / Dielectric Constant), D257 (DC Resistance / Conductance).