Q: ¬†Why should these binders be preferred?
- Good repairability of mould/core
- Option of selection of suitable binder system collapsibility
- No atmospheric effect on already-made mould/core when stored
- Reclaimability up to 80%-90%
Q: How to arrive at %addition?
A: It is related to the desired strength of mould/core as decided by a foundry.
Q: How to control sand setting time?
A: It can be done in consultation with Technical Expart of supplier, by changing %addition of catalyst, strength of catalyst, changing the catalyst itself.
Q: Why the binder-catalyst system doesnot give same bench life of sand-mix throughout the year?
A: It is influenced by ambient temparature and humidity of atmosphere.Therefore catalyst addition and shop practice require adjustment to reach solution.
Q: Howlong the same supply of resin binder system can be used?
A: It has specific shelf-life under a specific storage condition as recommended by supplier. For best use it is mandatory to consume the material within the shelf life period.
Q: What are the other factors to be taken care of?
- Avoid contamination from container, day-storage tank, mixer put to use, etc.
- Protect the material from exposure to external heat
- Not to use worm/hot sand for sand preparation
- Protect skin, eyes from coming in direct contact with material In case of excess evolution of pungent gases from the sand-mix use nose musk and discuss with supplier
- Follow Material Safety Data Sheet (MSDS) instructions
Q: Do these binders increase sand fusion defects in casting?
A: Organic binders don’t influence refractoriness of sand rather improves collapsibility & in turn reduce tendency if sand fusion. Actually there are many other factors for sand fusion defect in a casting
Q: Is there any connection to Inclusion defect?
A: Once the strength of moulding sand in combination with bench-life of sand mix is finalised the inclusion defect is likely related to gating system, moulding/coremaking discipline, making of liquid metal and pouring art.