October 3, 20214 yr No it’s not but if you replace at least half of the sand with perlite it performs way better than just p.0.p. And sand.
October 3, 20214 yr P.O.P isn't good anywhere close to the flame. It's okay at best as the insulating layer if it's far enough back from the flame face it can't be subjected to red heat. Promoting P O P as a suitable forge liner in any way when there are so many GOOD inexpensive alternatives isn't helping anybody. Frankly it's a disservice to the craft. Frosty The Lucky.
October 4, 20214 yr Plaster of Paris starts to degrade at only 1000 degF below good forging temperatures. This gives it a rather limited lifespan. If you plan to use the forge for more than one project; do it RIGHT, it doesn't cost that much and generally you will save the cost with lower gas usage over a fairly short period of time.
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