Neuthane 700 Series MDI – Ester Prepolymers (80 – 95 Shore A)

Properties

The Neuthane 700 series are high performance MDI - ester prepolymers designed to produceitems for use in arduous application areas.

They offer:

  • a high level of physical properties
  • good cut and abrasion resistance
  • good chemical resistance
  • extended hardness range with CA curatives

Typical Applications

  • Mining and quarrying (e.g. screen decks, scraper blades)
  • Medium load roller coverings (e.g. steel industry – dry applications)
  • Oil and gas industry (e.g. gaskets, pipe pigs)
  • Wheels (e.g. pallet truck)

Processing can be by hand or by dispensing machine

Hand Processing

  • Melt prepolymer at 60-70°C for 12-24 hours (as a guide the grades with the lower NCO value will takelonger to melt than those with higher NCO values)
  • Heat the prepolymer and curative to the recommended temperature
  • Ensure 1:4 Butanediol is dry by applying vacuum at 115°C
  • Add pigments and Antifoam, as applicable, whilst mixing
  • It is recommended that air be removed from the prepolymer under vacuumprior 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

  • Humid / Wet – PTMEG ether based systems should be considered: Neuthane 100 [TDI], Neuthane 600 [MDI] or Neuthane 500 [Aliphatic]
  • Dynamic / Resilience – PTMEG ether based materials should be considered:Neuthane 100 [TDI], Neuthane 600 [MDI] or Neuthane 801 [MDI Quasi]
  • Temperature – Neuthane 100 [TDI PTMEG] or Neuthane 500 [Aliphatic Isocyanate]

To view the full width of the table, turn your mobile to landscape.

Neuthane 700 Series MDI – Ester Prepolymers (80 – 95 Shore A)

Neuthane 760 765 766 775 795
%NCO (mid-point) % 6.0 6.5 6.5 7.5 9.5
Curative 1,4 - Butanediol 1,4 - Butanediol 1,4 – Butanediol 1,4 – Butanediol 1,4 - Butanediol
Recommended Stoichiometry % 98.5 98.5 98.5 98.5 98.5
Mix Ratio Curative per 100 Parts Resin by weight 6.33 6.86 6.86 7.92 10.03
Resin Temperature °C 80 80 80 75 75
Curative Temperature °C 60 60 60 60 60
Recommended Mould Temperature °C 105 105 105 105 105
Viscosity @ 100°C cps 830 700 635 500 245
Pot life (on a 500g mix) minutes 10 9 8 7 6
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 105 / 16 + 24 at RT
Hardness DIN 2240-91 Shore A 80 85 85 90 95
DIN 2240-91 Shore D - - - - -
100% Modulus BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

780

(5.4)

900

(6.2)

880

(6.1)

950

(6.6)

2200

(15.2)

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

(Mpa)

1380

(9.6)

1750

(12.1)

2300

(15.9)

2760

(19.0)

4020

(27.7)

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

(Mpa)

6380

(44.0)

6650

(45.9)

7400

(51.0)

7400

(51.0)

6590

(45.4)

Elongation at Break BS 903 Pt A2 - ISO 37 % 630 650 480 480 600
Tear Strength BS 903 Pt A3 - ISO 34-1 lb/in

(KN/m)

485

(85.1)

555

(97.2)

490

(85.8)

490

(85.8)

730

(128)

Compression Set BS903 Pt A6 - ISO 815 % 59 53 41 36 32
Abrasion loss DIN 53516 mm³ 23 20 19 22 34
Resilience ASTM D 2632-92 % 38 36 16 20 30
Specific Gravity g/cm³ 1.23 1.24 1.24 1.24 1.25

Neuthane 700 Series MDI – Ester Prepolymers (80 – 95 Shore A - High Resilience)

Neuthane 760HR 765HR 775HR 795HR
%NCO (mid-point) % 6.0 6.5 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 3.66 6.86 7.92 10.03
Resin Temperature °C 80 80 75 75
Curative Temperature °C 60 60 60 60
Recommended Mould Temperature °C 105 105 105 105
Viscosity @ 100°C cps 810 700 560 280
Pot life (on a 500g mix) minutes 11 10 8 7
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
DIN 2240-91 Shore D - - - -
100% Modulus BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

900

(6.20)

730

(5.0)

900

(6.20)

1050

(7.20)

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

(Mpa)

1530

(10.6)

1655

(11.4)

1800

(12.3)

2500

(14.4)

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

(Mpa)

7020

(48.3)

6810

(46.9)

5440

(37.5)

5300

(36.6)

Elongation at Break BS 903 Pt A2 - ISO 37 % 515 550 570 590
Tear Strength BS 903 Pt A3 - ISO 34-1 lb/in

(KN/m)

470

(82.5)

500

(87.7)

600

(105.2)

730

(128)

Compression Set BS903 Pt A6 - ISO 815 % 42 30 30 28
Abrasion loss DIN 53516 mm³ 23 22 22 30
Resilience ASTM D 2632-92 % 44 49 49 40
Specific Gravity g/cm³ 1.23 1.24 1.24 1.25

Neuthane 700AW Series MDI – Ester Prepolymers (85 – 95 Shore A)

Properties

The Neuthane 700AW series are high performance MDI - ester prepolymers designed to produce items requiring a combination of high resilience and excellent tear strength compared to other prepolymers the ‘AW’ materials are characterised by not only impressive DIE C tear strength but also Trouser tear.

They offer:

  • a high level of physical properties
  • good cut and abrasion resistance
  • high resilience

Typical Applications

  • Mining and quarrying (e.g. screen decks, scraper blades)
  • Medium load roller coverings (e.g. steel industry – dry applications)
  • Wheels (e.g. pallet truck)

Processing can be by hand or by dispensing machine

Hand Processing

  • Melt prepolymer at 60-70°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 applying vacuum at 115°C
  • 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 materialis left on the container sides (if necessary the mix can be transferred to a second clean containerand mixed again)
  • Remove air under vacuum
  • Cast into moulds, preheated to the recommended temperature
  • Cure as recommended

Processing

  • 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

  • Humid / Wet – PTMEG ether based systems should be considered: Neuthane 100 [TDI], Neuthane 600 [MDI] or Neuthane 500 [Aliphatic]
  • Dynamic / Resilience – PTMEG ether based materials should be considered: Neuthane 100 [TDI], Neuthane 600 [MDI] or Neuthane 801 [MDI Quasi]
  • Temperature – Neuthane 100 [TDI ] or Neuthane 500 [Aliphatic Isocyanate] should be considered

Neuthane 700AW Series MDI – Ester Prepolymers (85 – 95 Shore A)

Neuthane 766 765HR 765AW
%NCO (mid-point) % 6.5 6.5 6.5
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 6.86 6.86 6.86
Resin Temperature °C 80 80 75
Curative Temperature °C 60 60 60
Recommended Mould Temperature °C 105 105 105
Viscosity @ 100°C cps 620 730 900
Pot life (on a 500g mix) minutes 8 10 7
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 85 85 85
100% Modulus BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

880

(6.1)

680

(4.7)

840

(5.8)

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

(Mpa)

2200

(15.2)

1190

(8.2)

2227

(15.4)

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

(Mpa)

6400

(44.2)

6500

(44.9)

7416

(51.2)

Elongation at Break BS 903 Pt A2 - ISO 37 % 510 650 594
Tear Strength BS 903 Pt A3 - ISO 34-1 lb/in

(KN/m)

490

(85.8)

470

(82.3)

609

(106.6)

Trouser Tear lbf/in

(KN/m)

563

(98.5)

172

(30.1)

489

(85.6)

Compression Set BS903 Pt A6 - ISO 815 % 41 35 -
Abrasion loss DIN 53516 mm³ 19 19 -
Resilience ASTM D 2632-92 % 16 50 38
Specific Gravity g/cm³ 1.24 1.24 1.24

 

Neuthane 700AW Series MDI – Ester Prepolymers (85 – 95 Shore A)

Neuthane 795 795HR 795AW
%NCO (mid-point) % 9.5 9.5 9.5
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 10.03 10.03 10.03
Resin Temperature °C 75 75 75
Curative Temperature °C 60 60 60
Recommended Mould Temperature °C 105 105 105
Viscosity @ 100°C cps 280 280 385
Pot life (on a 500g mix) minutes 6 7 4.5
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 95 95 95
100% Modulus BS 903 Pt A2 - ISO 37 lb/in²

(Mpa)

2080

(14.4)

990

(6.8)

1543

(10.6)

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

(Mpa)

3850

(26.6)

2090

(14.4)

3144

(21.7)

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

(Mpa)

6180

(42.6)

5300

(36.6)

6601

(45.5)

Elongation at Break BS 903 Pt A2 - ISO 37 % 540 650 579
Tear Strength BS 903 Pt A3 - ISO 34-1 lb/in

(KN/m)

830

(145.3)

625

(109.4)

750

(131.1)

Trouser Tear lbf/in

(KN/m)

375

(65.6)

450

(78.8)

835

(146.1)

Compression Set BS903 Pt A6 - ISO 815 % 32 28 -
Abrasion loss DIN 53516 mm³ 34 30 -
Resilience ASTM D 2632-92 % 30 40 40
Specific Gravity g/cm³ 1.25 1.25 1.25

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