Temperature range from 0C to 10C (32F to 50F). Recommended iron temp: 120C (248F). A new wax in for the Cera Nova X line made a little bit harder than the old HF10. Our test result shows that a slightly harder wax performs better in this area compared to the old classic, especially noticeable when used alone. The adjusted hardness is also making the wax more durable than before.The speed of the iron should be approx. 8-10 sec. on a skating ski. The wax can be re-heated after cooling to room temperature (10 min) for better durability. Important to have a good iron to get an efficient melting of the wax.HF10X can be used as a race wax alone, but is often used as a base for Cera F, such as FC10X and HVC Warm (FC80L).