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D6358-19 – Standard Test Method Technical Guide
🌐 Scope and Applicability of ASTM D6358-19
ASTM D6358-19 establishes a classification system for poly(phenylene sulfide) (PPS) materials using ISO test methods. The standard specifically covers unfilled, reinforced/filled, and impact modified materials intended for injection molding, extrusion, and blow molding processes. It is important to note that this specification also allows for the use of recycled, reconstituted, recovered, or reprocessed PPS provided all requirements are met. Compliance is the joint responsibility of the supplier and buyer, with guidance provided by the now-withdrawn Guide D7209.
⚠️ Precautionary Note: As stated in Section 1.4 of the standard, this document does not purport to address all safety concerns. Users are responsible for establishing appropriate safety, health, and environmental practices before use.
This standard is designed to provide a means of calling out plastic materials for fabrication. It is emphatically not intended for material selection, which requires careful engineering consideration of design, performance, environment, fabrication cost, and inherent properties beyond this classification.
📜 Classification System and Material Groups
The core of the ASTM D6358 system is a cell class format derived from the material’s properties. The primary division is based on the material composition as defined in the standard’s Table PPS. Suffixes, as defined in Section 5, can be appended to specify specialized requirements such as flame retardancy or specific thermal properties. The table below outlines the main material groups.
| 🟦 Material Group | 📋 Description (Based on Scope 1.1) | 🎯 Typical Processes |
|---|---|---|
| Unfilled PPS | Neat resin, internally lubricated, or unmodified grades | Injection Molding, Extrusion, Blow Molding |
| Reinforced/Filled PPS | Compounds containing glass fiber, mineral, or other reinforcements | Injection Molding, Extrusion |
| Impact Modified PPS | Resins blended with elastomers or toughening agents for improved ductility | Injection Molding |
💡 Designation Tips: When specifying a material, always consult Section 5 for suffix options. These allow you to call out critical characteristics specific to the end-use application, ensuring the material meets the specialized demands of the part.
⚖️ Relationship to Other PPS Standards
Users navigating the PPS specification landscape must recognize how D6358 relates to its companion standards. It is essential to distinguish this standard from others covering similar materials but using different test frameworks or scopes.
| 📏 Designation | ⚙️ Test Method Origin | 📐 Specific Scope |
|---|---|---|
| ASTM D6358-19 | ISO Methods | Unfilled, Reinforced, and Impact Modified PPS |
| ASTM D4067 | ASTM Methods | Reinforced and Filled PPS only |
| ISO 28078 | ISO Methods | Same subject matter as D6358 but differs in technical content |
✅ Key Distinction: Remember, ASTM D4067 utilizes ASTM test methods, while D6358 utilizes ISO methods (Note 2). Furthermore, although D6358 and ISO 28078 cover similar ground, they are not technically equivalent (Note 1). Always verify the specific version and requirements of the standard being invoked.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D6358-19?
It covers unfilled, reinforced/filled, and impact modified poly(phenylene sulfide) materials suitable for injection molding, extrusion, and blow molding. It specifically requires the use of ISO testing methods for evaluation.
💡 Does this standard use ASTM or ISO test methods?
ASTM D6358 uses ISO test methods. This is a key distinction from ASTM D4067, which uses ASTM test methods for reinforced and filled PPS materials.
⚡ Are recycled PPS materials covered by this specification?
Yes, the standard allows for the use of recycled, reconstituted, recovered, or reprocessed PPS. The responsibility for ensuring compliance with all requirements lies with both the material supplier and the buyer.
📌 How does ASTM D6358 relate to ISO 28078?
According to the standard’s notes, D6358 and ISO 28078 address the same subject matter but differ in technical content. They are not directly interchangeable and users must evaluate the specific technical differences for their application.