Thank you darock, Yes I intended to mean all the pure nylon props, I was trying to differentiate between the pure nylon and the wood Grish props, don,t want to boil those

Pure nylons in something over eight nine inchs will separate at relatively low rpm's that todays engines exceed if not boiled.

Actually if you have bolted wing especially with shoulder or high wing with nylon bolts these will be less prone to breaking if boiled.

John