Insufficient conditioning of a bentonite-bonded mold matgerial for the green sand molding process.
Essentail defects leading to sub-conditioning
- too low water content
- too low active bentonite,
- too much decomposition product in the sand (too low degree of refreshment and/or too low new sand and/or used core sand addition) or
- incorrect sequence of addition of components to the mixer and/or
- too short mixing times.