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D5960-03 – Standard Test Method Technical Guide
🧪 Chemical Composition and Purity Specifications
Technical grade ethylene dichloride (1,2-dichloroethane) covered by ASTM D5960-03 is defined by strict limits on chemical purity to ensure its reliable performance as a chemical intermediate and industrial solvent. The mandatory compositional requirements are detailed in Table 1 of the standard. Key parameters requiring verification include the minimum assay, color, density, and the absence of corrosive acidic or alkaline contaminants.
| 🧪 Property | 📏 Specification Limit | ⚡ Test Method |
|---|---|---|
| Assay (Ethylene Dichloride), min wt% | 99.5 | D6806 |
| Color, Pt-Co Scale, max | 15 | D2108 |
| Specific Gravity, 20/20 °C | 1.282 – 1.283 | D2111 |
| Acidity (as HCl), max wt% | 0.001 | D2989 |
| Alkalinity (as NaOH), max wt% | 0.001 | D2989 |
| Water Content, max wt% | 0.01 | D3401 |
⚙️ Test Methods and Quality Assurance
To confirm compliance with the compositional table, the specification mandates specific ASTM test methods for each property. Gas chromatography, performed according to Practice D6806, is the primary method for establishing the minimum 99.5% assay. Physical properties are verified using Test Method D2108 for color (Platinum-Cobalt Scale) and D2111 for specific gravity. Given the chemical’s sensitivity to moisture, water content is strictly controlled and measured via Test Methods D3401. Finally, Test Method D2989 is utilized to quantify acidity (as HCl) and alkalinity (as NaOH), ensuring the product is stable and free from corrosive impurities.
💡 Tip: When performing acceptance testing, always utilize the most current edition of the referenced ASTM standards (D2108, D2111, D2989, D3401, D6806) to ensure your analytical results fully align with the requirements of D5960.
📦 Packaging, Marking, and Regulatory Compliance
Section 4 of D5960-03 directly links the specification for technical grade ethylene dichloride to critical federal regulations for safe commerce. It mandates that packaging and marking comply with the U.S. Department of Transportation Hazardous Materials Regulations (49 CFR 100 to 199). Furthermore, industrial quantities must be labeled in accordance with the OSHA Hazard Communication Standard (29 CFR 1910.1200). This integrated approach ensures that the chemical is properly classified, packaged, and documented for transport, and that downstream users receive critical hazard information through standardized container labels and Safety Data Sheets (SDS).
⚠️ Warning: Ethylene dichloride is a flammable liquid and confirmed animal carcinogen with potential human health risks. Strict adherence to the required DOT and OSHA regulations, including proper ventilation, grounding against static discharge, and the use of appropriate personal protective equipment (PPE), is mandatory during all handling and transfer operations.
❓ Frequently Asked Questions
🔍 What is the primary use of technical grade ethylene dichloride (EDC)?
The principal application for the material described in this specification is as a chemical intermediate in the production of vinyl chloride monomer (VCM), the precursor to polyvinyl chloride (PVC) plastics. It is also utilized as a solvent in specialized industrial processes such as oil extraction and vapor degreasing.
💡 How does D5960 ensure consistent batch quality?
By providing a definitive table of required chemical properties with specific numerical limits (Table 1) and tying each limit to a specific, repeatable ASTM test method, the standard provides an unambiguous benchmark for quality control. Both producers and consumers can use these methods to independently verify that a shipment meets the “Technical Grade” designation.
⚡ What is the significance of the tight specific gravity range (1.282 – 1.283)?
This narrow range acts as a highly effective physical quality check. A specific gravity reading outside this window immediately flags potential contamination with heavier (e.g., other chlorocarbons) or lighter (e.g., water) substances, providing a rapid screening tool before detailed chromatographic analysis is performed.
📌 Why are the acidity and alkalinity limits so strict (0.001%)?
Trace levels of acidic or basic impurities can catalyze the dehydrochlorination of ethylene dichloride, leading to the formation of corrosive hydrogen chloride gas and unsaturated chlorinated compounds. The strict limits ensure the chemical’s stability, prevent corrosion of storage equipment, and safeguard the integrity of downstream chemical processes.