ASTM International has developed several standards for flash point testing, with D93 and D92 being two of the most commonly used. Understanding their differences is crucial for accurate and compliant testing.
ASTM D93: Pensky-Martens Closed Cup Tester
This method is used for petroleum products and biodiesel blends. It's particularly suitable for samples with flash points between 40°C and 360°C (104°F to 680°F).
ASTM D92: Cleveland Open Cup Tester
This method is typically used for petroleum products with flash points between 79°C and 400°C (174°F to 752°F). It's particularly useful for samples that might contain suspended solids or form surface films.
Key Differences
| Feature | ASTM D93 | ASTM D92 |
|---|---|---|
| Cup Type | Closed | Open |
| Temperature Range | 40-360°C | 79-400°C |
| Sample Size | 2-4 mL | 50-70 mL |
