·  Composition: 95% propylene + 5% propane. Its combustion temperature reaches 1980°C (3600°F) without pure oxygen as combustion-supporting agent. It outperforms propane greatly in low-temperature performance with stable pressure under subzero conditions, making it the top choice for outdoor refrigeration maintenance.

·  High flame temperature enables welding of thick copper pipes over 16 mm, while propane is only applicable for thin copper tubing welding.