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D6472-10 – Standard Test Method Technical Guide
The ASTM D6472-10 standard sets forth requirements for recycled ethylene glycol and propylene glycol base engine coolant concentrates for use in automobiles and light-duty vehicles. These concentrates are produced from recycled aqueous coolants and must meet specific criteria to ensure effective performance in cooling systems.
🛡️ Scope and General Requirements
D6472-10 applies solely to recycled glycol base engine coolants derived from used aqueous coolant or blends with virgin glycol. It excludes coolants from non-glycol sources such as medical waste, distillation bottoms, airplane deicers, and polyester waste. The standard includes a procedure for evaluating recycling technologies using a synthetic used coolant reference. When diluted to 40–70% by volume in water, the concentrate provides freeze, boil, and corrosion protection for automotive and light-duty service.
📊 Chemical and Physical Specifications
The concentrate must adhere to rigorous chemical and physical parameters assessed through ASTM test methods. Table 1 lists key test methods used for quality assurance.
| 🟦 Test Method | 📏 Parameter | 🎯 Application |
|---|---|---|
| D1120 | Boiling Point | Ensures high-temperature protection |
| D1121 | Reserve Alkalinity | Measures corrosion inhibition capacity |
| D1177 | Freezing Point | Verifies low-temperature performance |
| D1384 | Glassware Corrosion | Assesses corrosion protection in lab |
| D4340 | Aluminum Corrosion under Heat Rejecting | Evaluates heat-rejecting corrosion |
Additional requirements include ash content (D1119), chloride and sulfate levels (D5827 or D4327), and water content (D1123). The concentrate must also pass simulated service tests like D2570 and D2809.
⚙️ Compliance and Performance Testing
Table 2 outlines performance test methods that ensure the recyclate meets durability and service life expectations.
| ⚡ Test Method | 📐 Focus | 🎯 Compliance Criterion |
|---|---|---|
| D2570 | Simulated Service | Minimized corrosion and deposits |
| D2809 | Aluminum Pump Cavitation | Resistance to cavitation erosion |
| D1881 | Foaming Tendencies | Low foaming for heat transfer |
| D2847 | Vehicle Service Testing | In-field performance validation |
💡 Tip: The synthetic used coolant reference in D6472 helps standardize evaluation of recycling technologies, ensuring consistency across processes.
❓ Frequently Asked Questions
🔍 What glycol types are covered? Both ethylene glycol and propylene glycol bases are included.
💡 What is the recommended dilution? Use 40–70% concentrate by volume in water for optimal protection.
⚡ How is corrosion protection tested? Through methods like D1384 (glassware) and D4340 (heat-rejecting conditions).
📌 What does the synthetic used coolant procedure entail? It provides a consistent reference for evaluating recycling technology performance.
⚠️ User Responsibility: Per Section 1.3, users must establish safety practices and comply with regulations.