Neuthane™ 300 Series TDI – PPG Ether Prepolymers (80 - 95 Shore A)
Properties
The Neuthane 300 series of TDI-PPG ether prepolymers are designed to offer a reasonable level of physical properties at a price advantage over TDI–PTMEG systems.
They offer:
- a reasonable level of physical properties
- low cost
- good hydrolysis resistance
- ease of use
- low viscosity
Typical Applications
- Dunnage
- Non-dynamic roller coverings (e.g. conveyor rollers for the steel industry)
- Scraper blades (e.g. snow plough blades)
- Wheels (low load)
Processing can be by hand or by dispensing machine
Hand Processing
- Melt prepolymer at 50-60°C for 12-24 hours
- Heat the prepolymer and curative to the recommended temperature
- Add pigments and Antifoam, as applicable,whilst mixing
- It is recommended that air be removed from the prepolymer under vacuum prior to addition of the curative
- Add the curative and thoroughly mix ensuring that no unmixed material is left on the
container sides (if necessary the mixcan be transferred to a second clean container and mixed again) - Remove air under vacuum
- Cast into moulds, preheated to the recommended temperature
- Cure as recommended
Processing Considerations
- Avoid prolonged storage of prepolymers at elevated temperatures.
- This will result in low hardness and lower properties of the cured materialAvoid moisture contamination of all materials
- Part used containers should be flushed with dry nitrogen and resealed immediately after use
- The development of cure is longer than for PTMEG systems.
- Rapid temperature changes during the early stage of cure should be avoided
Alternatives
- Dynamic / Resilience – Neuthane 100 [TDI-PTMEG] or Neuthane 600 [MDI-PTMEG]
- Solvents / Abrasion – ester based systems should be considered Neuthane 200 [TDI] or Neuthane 700 [MDI]
- Humid / Wet – MDI or Aliphatic Isocyanate based systems should be considered: Neuthane 600 [MDI] or Neuthane 500 [Aliphatic]
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Neuthane 300 Series TDI – PPG Ether Prepolymers (80 - 95 Shore A)
| Neuthane | 335 | 343 | 353 | 363S | 363 | ||
| %NCO (mid-point) | % | 3.5 | 4.6 | 5.3 | 6.3 | 6.3 | |
| Curative | MOCA | MOCA | MOCA | MOCA | MOCA | ||
| Mix Ratio Curative per 100 Parts Resin | % | 10.6 | 13.9 | 15.9 | 19.0 | 19.0 | |
| Recommended Stoichiometry | by weight | 95 | 95 | 95 | 95 | 95 | |
| Resin Temperature | °C | 75 | 70 | 70 | 70 | 65 | |
| Curative Temperature | °C | 110 | 110 | 110 | 110 | 110 | |
| Recommended Mould Temperature | °C | 90 | 90 | 90 | 80 | 85 | |
| Viscosity @ 100°C (prepolymer) | cps | 160 | 140 | 140 | 100 | 100 | |
| Pot life (on a 500g mix) | minutes | 9 | 8 | 8 | 8 | 5 | |
| Recommended Cure Temperature / Time | °C / hrs | 95 / 20 | 95 / 20 | 95 / 20 | 90 / 20 | 90 / 20 | |
| Hardness | DIN 2240-91 | Shore A | 82 | 87 | 92 | 93 | 95 |
| DIN 2240-91 | Shore D | - | - | - | - | - | |
| 100% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
590
(4.1) |
930
(6.4) |
1500
(10.3) |
1910
(13.2) |
2250
(15.5) |
| 300% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
1200
(8.3) |
860
(5.9) |
3010
(20.8) |
2020
(14.0) |
2390
(16.5) |
| Tensile Strength | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
2650
(18.3) |
1830
(12.6) |
5210
(35.9) |
4270
(29.5) |
4570
(31.5) |
| Elongation at Break | BS 903 Pt A2 - ISO 37 | % | 670 | 470 | 420 | 400 | 340 |
| Tear Strength | BS 903 Pt A3 - ISO 34-1 | lb/in
(KN/m) |
320
(56.0) |
400
(70.3) |
385
(67.7) |
410
(71.8) |
460
(80.6) |
| Compression Set | BS903 Pt A6 - ISO 815 | % | 38 | 36 | 37 | 43 | 38 |
| Abrasion loss | DIN 53516 | mm³ | 159 | 121 | 119 | 132 | 118 |
| Resilience | ASTM D 2632-92 | % | 40 | 30 | 29 | 27 | 28 |
| Specific Gravity | g/cm³ | 1.08 | 1.12 | 1.13 | 1.14 | 1.14 | |
Information contained in the data is, to the best of our knowledge, true and accurate. Since conditions of use are beyond our control, no warranty is given or implied in respect of any recommendations or suggestions made by ourselves, nor is freedom from patent infringement inferred.