Ribbon burner alumina

[Enzo Di Palma]

Hi, i have a question, i'm about to build a forge and a ribbon burner, i can buy some cement or mortar with 60% alumina or 80% alumina, the difference is mainly the price, fo me, the question is, can i build a ribbon burner with 60% alumina mortar or i need a 80%, if i can reduce the cost will be great, so for the experience people here i leave you with this question, thank you and have a nice day or night.