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SAE J2306-2000: Propylene Glycol Engine Coolant Concentrate Specifications
This article covers SAE J2306-2000, a recommended practice for propylene glycol-based engine coolant concentrate for automobiles and light trucks. Although cancelled, it offers valuable insights into coolant design and testing. 🛠️
Key Requirements for Propylene Glycol Coolant Concentrate
The coolant concentrate must consist of propylene glycol with additives. It must be clear, free of solids, and have an identifying color (preferably purple). Water quality for dilution is critical: total solids ≤340 ppm, hardness ≤170 ppm, chloride ≤40 ppm, sulfate ≤100 ppm.
⚠️ This standard is cancelled. Use current specifications for new designs.
Testing and Compliance Methods
Table 1 summarizes key physical, chemical, and performance requirements and their test methods.
| Property | Requirement | Test Method |
|---|---|---|
| Freezing Point (50% in water) | Max -32°C (-26°F) | ASTM D1177 |
| Boiling Point (concentrate) | Min 152°C (305°F) | ASTM D1120 |
| pH (50% in water) | 7.5 to 11.0 | ASTM D1287 |
| Chloride | Max 25 ppm | ASTM D3634 |
| Corrosion (Glassware) – Aluminum | Max 30 mg | ASTM D1384 |
| Simulated Service Corrosion – Aluminum | Max 60 mg | ASTM D2570 |
| Heat Rejecting Aluminum Corrosion | Max 1.0 mg/cm²/week | ASTM D4340 |
| Cavitation Erosion-Corrosion | Min 8 rating | ASTM D2809 |
Engineering Design Insights and FAQs
Key design insights include the importance of diluting the concentrate to 40-70% for use and ensuring compatibility with cooling system materials. Corrosion limits for aluminum surfaces are particularly critical.
Always verify coolant compatibility with nonmetallic parts like hoses per SAE J20 to avoid system damage.
Frequently Asked Questions
- What water quality is needed? Water must meet Appendix A requirements to prevent scaling and corrosion.
- Why is aluminum corrosion testing important? Modern engines use aluminum components, and this standard specifies relevant tests.
- Can this coolant be used without dilution? No, the concentrate must be diluted with water for proper operation.
- What replaces this standard? SAE J2306 was cancelled in 2000; refer to current ASTM D5216 or other standards.
Understanding SAE J2306-2000 helps in maintaining legacy systems and appreciating the evolution of coolant specifications.
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