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D6314-98 – Standard Test Method Technical Guide
📐 Scope and Material Classification
This specification covers melt processible molding and extrusion materials based on copolymers of tetrafluoroethylene (TFE) with perfluoroalkoxy side chains. These side chains are predominantly perfluoromethoxy (MFA) derived from perfluoro(methyl vinyl ether) and may include other perfluoroalkoxy groups from perfluoro(vinyl ethers). The standard excludes recycled plastics and is not intended for engineering design. Values are in SI units per IEEE/ASTM SI 10, with parenthetical information provided where applicable.
| 🟦 Property | 📏 Test Method | 📐 Description |
|---|---|---|
| Melt Flow Rate | D1238 | Flow rates of thermoplastics by extrusion plastometer |
| Tensile Properties | D638M | Tensile properties of plastics (metric) |
| Specific Gravity | D792 | Specific gravity by displacement |
| Density | D1505 | Density by density-gradient technique |
| Dielectric Properties | D150 | A-C loss characteristics and permittivity |
⚙️ Test Methods and Procedure Considerations
The standard references multiple ASTM methods for evaluation. For example, D1238 assesses melt flow rate, which is critical for processing. Specimens must be conditioned per D618 to ensure consistency. Results may vary between injection molded and extruded specimens, so adhere to the specified preparation methods. Refer to Section 9 for safety considerations related to test methods.
⚠️ Safety Caveat: Per Section 1.5, the standard does not address all safety concerns. Users must establish safety and health practices and determine regulatory limitations before use.
| ⚡ Procedure | 📏 Standard | 📐 Application |
|---|---|---|
| Conditioning | D618 | Standard conditioning for testing plastics |
| Thermal Analysis | D4591 | Determining temperatures and heats of transitions |
| Packaging | D3892 | Standard practice for packaging plastics |
📊 Key Material Properties and Specifications
MFA resins are identified by properties such as melt flow rate and density using the listed test methods. The standard uses SI units as the primary system. Material designation can follow ISO 12086-1, with testing per ISO 12086-2 as detailed in Appendix X1. Consistent quality control through these tests ensures proper material identification and performance.
✅ Tip: Maintain strict adherence to conditioning and test conditions for reproducible results. Specimen preparation methods directly affect property values.
❓ Frequently Asked Questions
🔍 What is MFA resin?
MFA resin is a copolymer of tetrafluoroethylene and perfluoro(methyl vinyl ether), forming perfluoromethoxy side chains, offering high thermal stability and chemical resistance.
💡 What tests are specified for MFA materials?
Key tests include melt flow rate (D1238), tensile properties (D638M), density (D1505), and specific gravity (D792), among others referenced in the standard.
⚡ Are safety notes included in the standard?
Yes, the standard includes a safety caveat in Section 1.5, emphasizing user responsibility for addressing hazards during testing.
📌 How are MFA materials designated?
Materials are designated according to the system in ISO 12086-1 and tested per ISO 12086-2, as outlined in Appendix X1.