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D4474-00 – Standard Test Method Technical Guide
🧪 Scope and Material Classification
ASTM D 4474 – 00 establishes a classification system for styrenic thermoplastic elastomer (TES) materials designed for injection molding and extrusion. These copolymers are characterized by polystyrene end-block segments bonded to rubbery mid-segments, which may be saturated or unsaturated. The standard permits the inclusion of compounding ingredients such as reinforcements, resins, plasticizers, fillers, stabilizers, and colorants. Recycled styrenic thermoplastic elastomers are explicitly not covered in this classification.
⚙️ Referenced Test Methods and Key Properties
Identification of specific TES grades is achieved through standardized test procedures. All conditioning must follow Practice D 618. The following table summarizes the principal ASTM test methods referenced in this standard for evaluating material properties.
| 🟦 Property | 📏 Test Standard | 🎯 Application for TES |
|---|---|---|
| Tensile Strength & Elongation | D 412 | Mechanical integrity and elasticity |
| Tear Strength | D 624 | Resistance to cut propagation |
| Durometer Hardness | D 2240 | Shore A/D scale designation |
| Flexural Properties | D 790 | Stiffness and flexural modulus |
| Density / Specific Gravity | D 792 | Material identification and consistency |
SI units, as detailed in IEEE/ASTM SI 10, are to be regarded as the standard. Conformance with specification limits must apply Practice E 29 for determining significant digits in test data.
💡 ISO Note: As per Note 1 of the standard, there is no equivalent ISO standard to D 4474 – 00, making this classification the definitive reference for TES materials.
📋 Line Callout and Specification System
The specification format follows the guidelines of Classification System D 4000. This structured line callout enables precise communication of material requirements. The standard is strictly intended for calling out materials for fabrication, not for material selection. The table below outlines the general callout structure.
| 🗂️ Block | 📐 Definition (per D 4000 / D 4474) |
|---|---|
| D 4474 | Primary standard designation |
| TES | Material code for Styrenic Thermoplastic Elastomer |
| Group / Class | Defines primary hardness and tensile strength requirements |
| Suffixes | Means for specifying specialized requirements per Section 5 |
⚠️ Important Disclaimer: “This classification system is intended to be a means of calling out materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection should be made by those having expertise in the plastics field after careful consideration of the design and performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the inherent properties of the material other than those covered by this classification system, and the economics.” (D4474-00, Introduction)
❓ Frequently Asked Questions
🔍 What specific materials are covered by ASTM D4474?
It covers styrenic thermoplastic elastomers (TES) for injection molding and extrusion. The copolymers consist of polystyrene segments bound to rubbery segments (saturated or unsaturated). Compounding ingredients are permitted, but recycled materials are not included.
💡 What are the primary test methods referenced for TES?
Key methods include D 412 for tension, D 624 for tear strength, D 2240 for durometer hardness, and D 790 for flexural properties. Conditioning must strictly follow Practice D 618.
⚡ How are TES materials specified using this standard?
Materials are specified using the D 4000 line callout format: D 4474 – TES [Group / Class] [Suffixes]. The suffixes, detailed in Section 5, allow for additional specialized requirements.
📌 Are the values in metric or imperial units?
The values stated in SI