Oil coating is not a corrosion protection while phosphate coating is. Testing was conducted by a 3rd party on oil-coated and phosphate-coated fittings to measure the corrosion resistance in the presence of salt. A 24-hour salt spray fog test was performed in accordance with ASTM B117-11. The result speaks for itself.

This is a test conducted by a 3rd party to evaluate welding of fittings coated with oil. The test shows that oil can cause flame-ups due to the flame during welding. The part was coated with oil to simulate the manufacturing process that some fitting manufacturers use and then wiped down to remove excess residual oil. Welding was then performed to determine the effects of the flame. The test indicates that there is a safety danger with welding fittings coated with oil. The size of the fire on the fitting varies depending on the amount of uncontrolled remaining oil on the fitting.

This is a test conducted by a 3rd party to evaluate welding of fittings coated with oil. The test shows that oil can cause flame-ups due to the fire during welding. This fitting was manufactured with an oil coating, and no additional oil was applied during the test. Welding was then performed to determine the effects of the flame. The test indicates that there is a safety danger with welding fittings coated with oil. The size of the fire on the fitting varies depending on the amount of uncontrolled remaining oil on the fitting

This test was performed by a 3rd party to see the effects of welding a phosphate coated fitting. Phosphate coating is a corrosion prevention. When compared to oil coating, phosphate coating has no danger of flame-ups whereas an oil coated fitting has a danger. No flame and minimal smoke was present at the end of the test.