HESITATION ABOUT CASTING SHELVES

Okay, I'm procrastinating... I've been looking over the research article and found out that the alumina based castable they used was only 8 percent silica.... the rest was fused alumina or various sizes.  My castables all have close to 30% silica.  Hopefully, this won't be an issue at 2300-2400 degrees F, and may actually help with mullite formation at those temps.  The norwegian folks were testing at higher temps mostly.