Polyether Based Casting Polyurethane Prepolymer
They also have advantages in high resilience, low temperature performance and resistance to water attack(hydrolysis). Polyethers also have lower viscosity and specific gravity.
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Product Introduction
Polyether based Casting Polyurethane prepolymer
1.Polyether based polyurethane prepolymer are recommended for applications where parts undergo dynamic stress, etc, they incur lower heat build-up. They also have advantages in high resilience, low temperature performance and resistance to water attack(hydrolysis). Polyethers also have lower viscosity and specific gravity.
2. Specifications,Application and operation details
PPG/TDI system Casting Polyurethane prepolymer
Item | Type | |||
HJ-1880 | HJ-1885 | HJ-1890 | HJ-1895 | |
NCO% Content | 3.7±0.2 | 4.0±0.2 | 5.0±0.2 | 6.2±0.2 |
Density 25℃/(g/cm³) | 1.10 | 1.10 | 1.10 | 1.10 |
Viscosity 80℃/mpa·s | 500-700 | 500-700 | 400-600 | 150-200 |
Appearance at 25℃ | Colorless transparent liquid | |||
Mix Temperature ℃ Prepolymer /Moca | 80℃/115℃ | 80℃/115℃ | 75℃/115℃ | 75℃/115℃ |
Gel Time /min | 8-12 | 6-8 | 3-5 | 2-4 |
Vulcanization Time (h) | 25-16 | 25-16 | 25-16 | 25-16 |
Physical Properties | ||||
Hardness (Shore A) | 80±2 | 85±2 | 90±2 | 95±2 |
Tensile Strength (Mpa) | 12-15 | 14-18 | 20-24 | 22-26 |
100% Modulus (Mpa) | 7-8 | 8-9 | 10-11 | 11-12 |
300% Modulus (Mpa) | -- | 11-12 | 16-17 | 20-21 |
Elongation at Break (%) | 260-320 | 300-400 | 340-420 | 350-420 |
Tear Strength (KN/m) | 50-55 | 65-75 | 80-90 | 85-95 |
Compression permanent deformation % | 6-8 | 6-8 | 4-6 | 4-6 |
DIN Abrasion loss（mm³） | ≤160 | ≤150 | ≤140 | ≤130 |
Resilience %/25℃ | 20-24 | 19-22 | 18-20 | 16-18 |
- Product application: Rod and bar, sheet and plate, seal, drag roller, caster, grinder lining, pipe lining, miscellaneous parts and other products. - Operation details: After vacuum degasing at 75-85 ℃, the prepolymer is mixed with melted MOCA for casting and vulcanization. It is suitable for manual and mechanical operation. - Storage: Store in a cool and dry place and use up as soon as possible after opening; If it cannot be used up at one time, it shall be sealed with nitrogen; The second opening needs to be used for defoaming, and the original storage period is six months. - Packing: 20kg or 200kg iron drum | ||||
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