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D4550-98 – Standard Test Method Technical Guide
🔍 Scope and Classification System
ASTM D4550-98 establishes a classification system for segmented block copolyether-ester (TEEE) elastomers intended for molding and extrusion. The standard covers both virgin and recycled, reconstituted, or reprocessed materials, provided they comply with the stated requirements. This system is designed for material identification in end-item fabrication and not for material selection, which should be performed by qualified professionals considering design, environment, and economics. Classification includes properties such as tensile strength, flexural modulus, and melt flow rate.
| 🟦 Standard | 📏 Title | 🎯 Application in TEEE |
|---|---|---|
| D 618 | Practice for Conditioning Plastics | Specimen conditioning before testing |
| D 638M | Test Method for Tensile Properties of Plastics [Metric] | Measure tensile strength and elongation |
| D 790 | Test Method for Flexural Properties | Determine flexural modulus and strength |
| D 1238 | Test Method for Flow Rates of Thermoplastics | Melt flow index measurement |
⚙️ Test Procedures and Conditioning
All test specimens must be conditioned in accordance with Practice D 618 prior to evaluation. Tensile properties are determined using Test Method D 638M with appropriate test speeds for TEEE materials. Flexural properties are assessed per Test Method D 790, while melt flow rate is measured using Test Method D 1238. These standardized procedures ensure consistent classification and compliance across different material lots and sources.
⚠️ Note: This standard does not address all safety concerns. Users must establish appropriate health and safety practices and determine regulatory limitations before use.
📊 Material Property Requirements
The classification system in D4550-98 requires specific property levels for TEE materials. Table TEEE in Appendix X1 provides reference values for properties like tensile strength, elongation, and flexural modulus. Suffix codes (Section 5) allow for additional specialized requirements. Both virgin and recycled materials must meet these criteria to receive classification.
| 🟦 Property | 📐 Test Method | ⚡ Units | 🎯 Typical Requirement |
|---|---|---|---|
| Tensile Strength | D 638M | MPa | ≥ 20 |
| Elongation at Break | D 638M | % | ≥ 300 |
| Flexural Modulus | D 790 | MPa | ≥ 200 |
| Melt Flow Rate | D 1238 | g/10 min | 1–50 |
💡 Consult the material manufacturer for detailed callouts and to access Tables TEEE and A in Appendix X1 for historical reference data.
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D4550-98? It provides a classification system for identifying TEEE materials in fabrication, not for material selection.
💡 Can recycled TEEE materials be used under this standard? Yes, if they meet all requirements, including those for recycled, reconstituted, or reprocessed content.
⚡ Which test method is used for tensile properties in D4550-98? Test Method D 638M is used for determining tensile properties of TEEE elastomers.
📌 How does this standard relate to international standards? It is similar to ISO FDIS 14910-1/-2 1997 but with significant technical differences.