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.