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Quasi-Prepolymer Cast Elastomers
Quasi-prepolymers are defined as NCO-terminated products prepared from diisocyanates and polyols with NCO contents between 16 and 25 percent. Two such quasi-prepolymers are Baytec® ME-120 and Baytec® ME-230. These products are liquid at ambient temperature, can be processed like one-shot elastomers and yield elastomer properties that come close to hot-cast prepolymer systems. Quasi-prepolymer Baytec ME-230 has important advantages over conventional hot-cast elastomer systems in that they:
- are low viscosity liquids at 25°C
- have favorable mix ratios
- are processable at room temperature or slightly above
- are processable using simple metering equipment
- result in elastomers with excellent overall physical properties
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