This will eliminate the primary cause of damage to the machines and reduce down time. Polypropylene and polycarbonate will survive, but polyethylene and high density polyethylene will not. If you are unsure about a new container, place it in an autoclave safe container the first time. To prevent the bottoms of bottles from breaking, place them in a tub with 1-2 inches of water. Autoclaving new glassware for 90 minutes will partially temper it, increasing its strength.
Superheated liquids can boil over, possibly damaging both autoclave and autoclave operator.
After the cycle is complete, let liquids stand 10 minutes more, movement could cause liquids to boil. Pyrex bottles, empty or full, should have their caps placed on loosely, to prevent explosion due to expansion. To ensure adequate steam penetration when treating biological waste, add 1 cup of water to dry loads and close the top of the bags, leaving a one inch opening.