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D6394-21 – Standard Test Method Technical Guide
🎯 Scope and Material Classes
ASTM D6394-21 covers sulfone plastics suitable for injection molding and extrusion. This standard explicitly allows the use of reprocessed or recycled materials. The primary families—Polysulfone (PSU), Polyethersulfone (PES), and Polyphenylsulfone (PPSU)—are addressed under distinct material classes.
⚠️ Not for Material Selection: Per Section 1.3, this system is a specification callout tool, not a material selection guide. Expert evaluation of design, environment, and costs is required.
📊 Key Properties and Test Methods
Property requirements are strictly governed by standardized test methods as defined in the referenced documents.
| 🟦 Property | 📏 Test Method | ⚡ Units |
|---|---|---|
| Tensile Strength | D638 | MPa |
| Flexural Modulus | D790 | MPa |
| Izod Impact (Notched) | D256 | J/m |
| Deflection Temp (1.8 MPa) | D648 | °C |
| Density | D792 | g/cm³ |
| Melt Flow Rate | D1238 | g/10 min |
| Flammability | D3801 | V-0, V-1, V-2 |
💡 Conditioning: All specimens must be conditioned per D618 prior to testing to ensure standardized moisture content.
⚙️ Classification and Line Callouts
Using the ASTM D4000 format, a line callout uses the “SP” prefix followed by digits for class, grade, and filler level. Suffixes in Section 5 unlock supplementary requirements.
| 📐 Element | 🎯 Description |
|---|---|
| SP | Sulfone Plastics group prefix. |
| 0 (Class) | Polymer type (e.g., PSU, PES, PPSU). |
| 1 (Grade) | Mechanical property range (tensile/modulus). |
| 22 (Filler) | Filler type and loading level percent. |
| + Suffix | Specialized requirements per Section 5. |
📌 Recycled Materials: When specifying recycled content, consult Guide D7209 for proper terminology and definitions.
❓ Frequently Asked Questions
🔍 What is the scope of D6394-21?
It classifies sulfone