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D2287-19 – Standard Test Method Technical Guide
ASTM D2287-19, formally titled “Standard Classification System and Basis for Specification for Nonrigid Vinyl Chloride Polymer and Copolymer Molding and Extrusion Compounds,” establishes a framework for classifying materials where the resin portion contains at least 90% vinyl chloride. The remaining composition typically includes copolymerized monomers or other resins mechanically blended with polyvinyl chloride (PVC) to achieve specific performance characteristics. This standard defines nonrigid vinyl compounds by their hardness range and covers materials intended for compression molding, injection molding, and extrusion.
📜 Scope and Classification System
The classification system detailed in D2287-19 centers on the hardness range of the nonrigid vinyl compound. These materials must contain the necessary stabilizers, plasticizers, fillers, dyes, and pigments to meet the designated requirements. It is critical to note that while the standard covers compounds recommended for compression, injection, and extrusion processes, a specific compound may not be universally suitable for all of these fabrication methods. The standard also acknowledges that some applications may contain recycled PVC plastics, provided they meet the specific requirements of the applicable product standard.
⚙️ Key Required Test Methods and Properties
To ensure compliance with the standard’s requirements, D2287-19 invokes a comprehensive series of ASTM test methods for verifying material properties. The following table summarizes the primary standards referenced for characterizing the physical and mechanical properties of the nonrigid vinyl compounds.
| 🟦 Property Evaluated | 📏 Referenced Standard | 🎯 Purpose in Classification |
|---|---|---|
| Durometer Hardness | ASTM D2240 | Defines the primary hardness range for material classification. |
| Brittleness Temperature | ASTM D746 | Determines low-temperature performance by impact testing. |
| Tensile Strength and Elongation | ASTM D638 | Measures mechanical properties under tensile load. |
| Volatile Loss | ASTM D1203 | Evaluates plasticizer retention and thermal stability. |
| Density and Specific Gravity | ASTM D792 | Used for material identification and quality control. |
📐 General Requirements and Conditioning
Proper conditioning of test specimens is essential for reproducible results. D2287-19 references Practice D618 for the standard conditioning of plastics prior to testing. The standard explicitly states that all values in SI units are regarded as the standard, with values in parentheses provided for information only. Users are also responsible for establishing appropriate safety and health practices. The standard’s terminology is governed by D883 and D1600, ensuring consistent language for specifiers and manufacturers.
⚠️ Important Note on Units: Per Section 1.4 of D2287-19, the values stated in SI units are to be regarded as the standard. Values given in parentheses are for information only. Specifiers must ensure primary compliance with the stated SI values.
💡 Note on International Standards: As detailed in Note 1 of the standard, ASTM D2287 addresses the same subject matter as ISO 2898-1 and ISO 2898-2, but differs significantly in technical content. Direct substitution of methods is not recommended without careful validation.
❓ Frequently Asked Questions
🔍 What resin composition does ASTM D2287-19 cover?
The standard covers nonrigid vinyl chloride polymers and copolymers where the resin portion contains at least 90% vinyl chloride. The remaining 10% can include one or more monomers copolymerized with vinyl chloride or other resins mechanically blended with PVC.
💡 Are compounds under D2287 suitable for all fabrication methods?
No. While the standard covers compounds recommended for compression, injection, and extrusion, it must be recognized that particular compounds are not suitable for all these means of fabrication. The user must verify compatibility with the intended process.
⚡ How does D2287 relate to the ISO standards 2898-1 and 2898-2?
ASTM D2287, ISO 2898-1, and ISO 2898-2 address the same general subject matter of nonrigid vinyl chloride compounds. However, as stated in the scope, they differ in their technical content and requirements.
📌 Does the standard allow for the use of recycled materials?
Yes. Section 1.7 states that some applications have the option to contain recycled PVC plastics that meet the requirements of this classification system. Users must refer to the Materials and Manufacture section of the applicable product standard for specific requirements.