Please register yourself to use the application. The monthly Subscription fee is USD 49 per month. This will allow you to use the Heat Loss steady state application on a month to month basis. The payment portal will appear after you have registered successfully. After we receive your payment we will activate your monthly subscription. Note: This is a full featured application. In this application you will be able to add new refractory materials with this subscription service. To upgrade you to the Yearly Subscription Please Send us an Email for it.