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D5136-24 – Standard Test Method Technical Guide
🧪 Product Composition and Purity Specifications
ASTM D5136-24 defines the rigorous standards for high purity p-Xylene, a critical feedstock for the production of terephthalic acid and other industrial chemicals. The specification mandates a minimum purity of 99.7 weight percent and sets stringent maximum limits for key aromatic and nonaromatic impurities. Conformance to these limits ensures the material meets the quality requirements for downstream chemical synthesis.
The following table outlines the core compositional requirements:
| 🟦 Property | 🎯 Specification Limit | ⚡ ASTM Test Method |
|---|---|---|
| Purity (min, wt%) | 99.7 | D5917 or D7504 |
| m-Xylene (max, wt%) | 0.20 | D5917 or D7504 |
| o-Xylene (max, wt%) | 0.10 | D5917 or D7504 |
| Toluene (max, wt%) | 0.10 | D5917 or D7504 |
| Ethylbenzene (max, wt%) | 0.20 | D5917 or D7504 |
| Nonaromatic Hydrocarbons (max, wt%) | 0.20 | D5917 or D7504 |
| Sulfur (max, mg/kg) | 1.0 | D7183 |
💡 Tip: Where multiple test methods are listed for the same property (e.g. D5917 and D7504 for purity), the standard recommends that the producer and user agree upon the referee method prior to testing to ensure consistent results.
📐 Physical Properties and Acceptance Criteria
In addition to chemical purity, D5136-24 establishes strict criteria for the physical quality of high purity p-Xylene. These specifications guarantee the material’s clarity, color stability, and distillation behavior, which are essential for consistent performance in manufacturing processes.
| 📏 Property | 🎯 Specification | ⚡ Test Method |
|---|---|---|
| Appearance | Bright and Clear (free of haze, particulates, or suspended matter) | E2680 |
| Color (max, Pt/Co scale) | 10 | D5386 or D8005 |
| Distillation Range (max, °C) | 1.0 (including the temperature of 138.3 °C at 101.3 kPa) | D850 |
⚠️ Safety Note: Per Section 1.4 of the standard, users must consult current OSHA regulations (29 CFR 1910.1000 and 1910.1200), supplier