Description
A new heat-cured, soft silicone rubber formulation developed for lower temperature vulcanizing that produces a mold with much less shrinkage (see table below) than other mold compounds. This new compound is used when shrinkage of a master pattern, used to make additional patterns in a production spincasting mold, must be limited. Shrinkage is so low that it is often unnecessary to use RTV silicones that require vacuum degassing and 24 hour cure cycles. Being a heat cured silicone, Nicem® Green also has physical properties vastly superior to RTV silicones.
During vulcanization, Nicem® Green requires as little as 20% of the pressure required to cure other mold compounds. This lower pressure requirement makes it ideal for delicate patterns that might be destroyed or distorted with standard pressure and temperature settings. Patterns can be made of metal, plastic, resins, butter board, plaster and wood. Each set consists of (2) 9″ x 1/2″ thick discs.
| Cure Schedule for 1″ Mold | ||
| Temperture | Time Required | Shrinkage |
| 250 deg. F | 78 mins. | 0.9% |
| 212 deg. F | 2 hrs., 48 mins. | 0.7% |
| 194 deg. F | 5 hrs. | 0.45% |
| 176 deg. F | 14 hrs. | 0.2% |
Product Details
| Rubber Series | Applications | Durometer | Flexibility | Tear Resistance | Temperature Resistance |
|---|---|---|---|---|---|
| Nicem White | A backing material for more expensive mold compounds. | 64-66 | Medium | Medium | Medium |
| 200 Series | Polyester and polyurethane resins, lead and tin alloys, and as a backing material for more expensive mold compounds. | 63 | Medium | Medium | Medium |
| 500 Series | Fishing lures, high lead content alloys and polyester and polyurethane resins. | 57 | Med-High | Medium | High |
| Nicem Green High Tear | Tin and lead alloy pieces with substantial undercuts. Often used for short runs in zinc alloys. | 55-57 | High | Very High | High |
| Nicem Yellow | Zinc, tin and lead alloys, polyester and polyurethane resins. | 59-62 | High | Med-High | Very High |
| Nicem Blue | Zinc, tin and lead alloys. Polyester and polyurethane. | 63-65 | Medium | Medium | Highest |
| Nicem Green Low Temperature Cure | A low temperature cure rubber used when very low shrinkage is necessary or desirable or when patterns are fragile. | 49-51 | Very High | Very High | Med-High |
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