Please register yourself to use the application. We charge you a nominal fee of US $ 9.99. This will allow you to use the HeatLoss steady state application life long. The payement portal will appear after you have registered successfully. After we receive your payment we will activate your life long subscription. Note: This is a full featured application with 42 refractory materials of 10 different classes that you can use for your analysis. You will not be able to add new refractory materials with this subscription service.To add new refractory materials you need to be upgraded to the next subscription level. Please Send us an Email for it.