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MDI/Polyether Polyurethane Prepolymer Shore A85
1. Description
This is a MDI based polyether polyurethane prepolymer.
2. Characteristics
3. Applications
4. Typical properties
| Type | Appearance | Viscosity(mPa.s/85℃) | NCO% | Packing(kg/drum) |
| Liquid | 280-300 | 4.50-4.70 | 20/200 |
5. Operating Procedure
First, the prepolymer should be preheated in 80-85℃. Second, after vacumming, the prepolymer is to be mixed with melting MOCA evenly. Third, with degassing, casting into mould, and vulcanization,and then demould. Lastly, the finished product should be post vulcanized.
6. Reaction parameters
| Item | MOCA (%) | Gel time(min) | Mixing temperature(℃) | Post vulcanization(h) |
| Specification | 12.8-13.3 | 3.5-4.0 | 80/120 | 10 |
7. Finished products properties
| Item | Hardness(Shore A) | Tensile strength(MPa) | Tear strength(KN/m) | Rebounding(%) |
| Physical properties | 85 | 20-22 | 50-60 | 27 |