• The outside diameter of the boss should be between 2X to 3X the diameter of the insert in order to provide sufficient strength and to minimize hoop shrink (shrink in the sidewall of the boss).
  • The boss height should be equal to the height of the insert – if the boss is too tall shrinkage may occur below the level of the boss
  • Ribs and gussets may be added for increased strength – rib or gusset thickness should be no greater than 60% of your boss sidewall thickness
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