Neuthane 600 Series MDI – PTMEG Ether Prepolymers (80 – 95 Shore A)

Properties

The Neuthane 600 series are high performance MDI - PTMEG prepolymers designed to produce items for use in extreme application areas.

They offer:

  • a very high level of physical properties
  • good dynamic performance
  • good hydrolysis resistance
  • high resilience
  • low viscosity
  • extended hardness range with CA curatives

Typical Applications

  • Wheels (e.g. fork truck, pallet truck and press on bands)
  • High performance in-line roller blade wheels (HR grades)
  • Roller coverings – wet applications (e.g. steel industry)
  • Mining and quarrying (e.g. screen decks, scraper blades)
  • Hydrocyclones
  • Oil and gas industry (e.g. gaskets)
  • Automotive (e.g. suspension bushes)

Processing can be by hand or by dispensing machine

Hand Processing

  • Melt prepolymer at 50-70°C for 12-24 hours (as a guide the grades with the lower NCO value will take longer to melt than those with higher NCO values)
  • Heat the prepolymer and curative to the recommended temperature
  • Ensure 1:4 Butanediol is dry by heating to 115°C and applying vacuum
  • 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 mix can 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 material
  • Avoid moisture contamination of all materials
  • Part used containers should be flushed with dry nitrogen and resealed
    immediately after use
  • Development of cure is long compared to TDI-MOCA systems.
  • Rapid temperature change during the early stages of cure should be avoided.

Alternatives

  • Solvents – ester based systems should be considered Neuthane 200 [TDI] or Neuthane 700 [MDI]
  • Cost – Ester systems can be considered: Neuthane 700 [MDI Prepolymer] or Neuthane 802 [MDI Quasi]
  • Temperature – Neuthane 100 [TDI PTMEG] or Neuthane 500 [Aliphatic Isocyanate]

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Neuthane 600 Series MDI – PTMEG Ether Prepolymers (80 – 95 Shore A)

Neuthane 660 668 675 695
%NCO (mid-point) % 6.0 6.8 7.5 9.5
Curative 1,4 - Butanediol 1,4 - Butanediol 1,4 - Butanediol 1,4 – Butanediol
Recommended Stoichiometry % 98.5 98.5 98.5 98.5
Mix Ratio Curative per 100 Parts Resin by weight 6.33 7.18 7.92 10.03
Resin Temperature °C 75 75 75 75
Curative Temperature °C 25 25 25 25
Recommended Mould Temperature °C 105 105 105 105
Viscosity @ 100°C (prepolymer) cps 630 440 410 330
Pot life (on a 500g mix) minutes 11 9 9 8
Recommended Cure Temperature / Time °C / hrs 105 / 16 + 24 at RT 105 / 16 + 24 at RT 105 / 16 + 24 at RT 105 / 16 + 24 at RT
Hardness DIN 2240-91 Shore A 80 85 90 95
DIN 2240-91 Shore D - - - -
100% Modulus BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

900

(6.2)

1190

(8.2)

1840

(12.7)

1880

(13.0)

300% Modulus BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

2070

(14.3)

2280

(15.7)

2980

(20.5)

3470

(23.9)

Tensile Strength BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

6100

(42.1)

5620

(38.7)

6150

(42.4)

6180

(42.6)

Elongation at Break BS 903 Pt A2 - ISO 37 % 440 450 430 470
Tear Strength BS 903 Pt A3 - ISO 34-1 lb/in

(KN/m)

405

(71.0)

485

(84.8)

525

(92.0)

680

(119.2)

Compression Set BS903 Pt A6 - ISO 815 % 25 22 20 16
Abrasion loss DIN 53516 mm³ 25 26 26 32
Resilience ASTM D 2632-92 % 45 46 46 45
Specific Gravity g/cm³ 1.09 1.10 1.10 1.12

Neuthane 600 Series MDI- PTMEG Ether Prepolymers - High Resilience (80 - 87 Shore A)

Neuthane 660HR 663HR 674HR
%NCO (mid-point) % 6.0 6.3 7.4
Curative 1,4 - Butanediol 1,4 - Butanediol 1,4 - Butanediol
Recommended Stoichiometry % 98.5 98.5 98.5
Mix Ratio Curative per 100 Parts Resin by weight 6.33 6.65 7.80
Resin Temperature °C 75 75 75
Curative Temperature °C 25 25 25
Recommended Mould Temperature °C 105 105 105
Viscosity @ 100°C (prepolymer) cps 620 620 440
Pot life (on a 500g mix) minutes 11 10 9
Recommended Cure Temperature / Time °C / hrs 105 / 16 + 24 at RT 105 / 16 + 24 at RT 105 / 16 + 24 at RT
Hardness DIN 2240-91 Shore A 80 84 87
DIN 2240-91 Shore D - - -
100% Modulus BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

890

(6.1)

780

(5.4)

1050

(7.2)

300% Modulus BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

1660

(11.5)

1700

(11.7)

2150

(14.8)

Tensile Strength BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

5830

(40.2)

6210

(42.8)

5730

(39.4)

Elongation at Break BS 903 Pt A2 - ISO 37 % 590 560 540
Tear Strength BS 903 Pt A3 - ISO 34-1 lb/in

(KN/m)

475

(83.4)

510

(89.4)

580

(98.2)

Compression Set BS903 Pt A6 - ISO 815 % 24 21 16
Abrasion loss DIN 53516 mm³ 15 12 13
Resilience ASTM D 2632-92 % 68 65 59
Specific Gravity g/cm³ 1.09 1.10 1.10

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