Is It Fire Proof? Like Could I Use It For An Outdoor Pizza Oven?

No. Pal Tiya Premium should not come into direct contact with a flame. Ensure that if you are putting a candle etc in a creation that there is an 'open top' so no heat can be trapped inside.

For Fire ovens: there are some very special 'refractory' materials that are made to handle the extreme heat of outdoor cooking ovens.