In the centrifugal casting industry, there has always been a big dilemma with silicone molds. The higher the thermal resistance, the lower the mechanical resistance and the higher the mechanical resistance, the lower the thermal resistance.
At CONIEX we have always tried to find the balance between both properties in order to obtain cost-effective and resistant molds for the different production processes of centrifugal casting:
In low-temperature vulcanizing molds, in parts with a lot of back-flow, tearing or breakage may occur in part of the part.
Pewter molds, although they already have high mechanical resistance, in pieces with a lot of back-flow, tears or breakages can occur in part of the piece.
Molds for zamak with high thermal resistance lack, however, sufficient mechanical resistance to avoid tearing or breakage in certain parts or parts of those parts: interiors, edges, fretwork, etc.
To avoid these breaks, the R+D+i laboratory of CONIEX, S.A. has developed a special silicone with high resistance to tearing, to be used as inserts and in small quantities, in the area of the mold where we know that these critical points of breakage occur. This extends the life of the mold, which will reach its productive end without early breakage.
Our tear silicone possesses:
- Extraordinary tear resistance
- High flexibility
- High fidelity reproduction
How is tear silicone used?
Before handling the tear silicone, make sure that the hands, table and utensils to be used are perfectly clean and free of grease or varnish.
Take small portions of silicone and knead manually before inserting the pieces in the critical areas of each part. It is important not to dirty the areas to be joined with talcum powder, since it will lose adherence to the mold.
To improve the adhesion between the tear silicone and the mold, it is advisable to clean and moisten the parts to be “hooked” with solvent which, once evaporated, will have generated a sticky surface on both silicones that will allow the bonding.
Insert the pieces as usual and fit the mold with the parts already perfectly positioned and joined.
We have tear silicone for low temperature vulcanization, between 90º and 120º and tear silicone for PEWTER and ZAMAK, suitable for molds that vulcanize between 160º and 180º.
Our Technical Department is at your disposal for any questions you may have.