This page features information on the Neuthane 200 Series
| Neuthane Code | ||
| TDI - Ester Prepolymers (70 - 95 Shore A) | 223 | |
| 225 | ||
| 235S | ||
| 235 | ||
| _________________________________________________________________________ | ||
| TDI-Ester Prepolymers (76-95 Shore A) | 235TS | |
| 235DS | ||
| 242S | ||
| 242 | ||
| 254 | ||
| ________________________________________________________________________ | ||
| TDI-Ester Prepolymers (cured with NEUTHANE TMP/TIPA & Plasticiser) | 234 | |
| 235S | ||
| 239 | ||
| 242S | ||
| 242 | ||
| 243MS | ||
| 250 Low Solvent Swell | ||
| 254 | ||
| 270 | ||
| _______________________________________________________________________ | ||
| TDI-Caprolactone Ester Prepolymers (60-95 Shore A) | 230 | |
| 232 | ||
| 244 | ||
| 251 | ||
| 255 |
They offer:
- a high level of physical properties
- good cut and abrasion resistance
- good chemical resistance
- hardness range from 75 - 95A (MOCA)
- hardness range from <40 – 60A (TMP)
Typical Applications
- Medium load roller coverings (e.g. steel industry – dry application areas)
- Roller coverings where lubricants are present (e.g. aluminium manufacture)
- Wheels (e.g. pallet truck)
- Mining and quarrying (e.g. screen decks, scraper blades)
- Oil and gas industry (e.g. gaskets, pipe pigs)
- Press blocks
- Paper converting (e.g. anvil rollers)
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
- 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
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]
- Non MOCA – MDI based systems should be considered: Neuthane 700 [Prepolymer] and 802 [Quasi]
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Neuthane 200 Series TDI - Ester Prepolymers (70 - 95 Shore A)
| Neuthane | 223 | 225 | 225 | 235S | 235S | 235 | 235 | ||
| %NCO (mid-point) | % | 2.3 | 2.5 | 2.5 | 3.5 | 3.5 | 3.5 | 3.5 | |
| Neuthane Curative | CA6 | MOCA | CA6 | MOCA | CA6 | MOCA | CA6 | ||
| Mix Ratio Curative per 100 Parts Resin | % | 5.6 | 7.5 | 6.0 | 10.6 | 8.5 | 10.6 | 8.5 | |
| Recommended Stoichiometry | by weight | 95 | 95 | 95 | 95 | 95 | 95 | 95 | |
| Resin process Temperature | °C | 70 | 85 | 85 | 85 | 80 - 90 | 85 | 85 | |
| Curative Temperature | °C | 20 - 25 | 110 | 20 - 25 | 110 | 20 - 25 | 110 | 20 - 25 | |
| Recommended Mould Temperature | °C | 90 | 95 | 95 | 95 | 90 | 95 | 95 | |
| Resin Viscosity (100°C / Process Temperature) | cPs | 850/2250 | 1030/1200 | 1030/1200 | 860/1310 | 1050/n.a. | 950/1313 | 950/1313 | |
| Pot life (on a 500g mix) | minutes | 10 - 20 | 17 | 17 | 15 | 13 | 7.5 | 5 | |
| Recommended Cure Temperature / Time | °C / hrs | 90-100/16 | 95/16 | 95/16 | 95/16 | 90-100/16 | 95/16 | 95/16 | |
| Hardness | DIN 2240-91 | Shore A | 70 | 76 | 73 | 85 | 83 | 86 | 87 |
| DIN 2240-91 | Shore D | - | - | - | - | - | - | ||
| 100% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
381
(2.63) |
480
(3.3) |
439
(3.0) |
760
(5.2) |
800
(5.5) |
840
(5.8) |
814
(5.6) |
| 300% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
590
(4.07) |
770
(5.3) |
711
(4.90) |
1310
(9.1) |
970
(6.7) |
1420
(9.8) |
1250
(8.6) |
| Tensile Strength | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
2161
(14.9) |
5400
(37.3) |
2810
(19.4) |
7400
(51.0) |
5800
(40.0) |
7360
(50.7) |
6220
(42.9) |
| Elongation at Break | BS 903 Pt A2 - ISO 37 | % | 965 | 750 | 787 | 570 | 700 | 630 | 622 |
| Tear Strength | BS 903 Pt A3 - ISO 34-1 | lb/in
(KN/m) |
353
(63) |
340
(59.5) |
345
(60.3) |
475
(83.5) |
460
(80.5) |
495
(86.8) |
509
(89.0) |
| Compression Set | BS903 Pt A6 - ISO 815 | % | 43.8 | 27 | 42.6 | 37 | 36 | 35 | 33.2 |
| Abrasion loss | DIN 53516 | mm³ | 21 | 43 | 15 | 42 | 14 | 40 | 30 |
| Resilience | ASTM D 2632-92 | % | 51 | 40 | 51 | 30 | 38 | 36 | 36 |
| Specific Gravity | g/cm³ | 1.15 | 1.23 | 1.17 | 1.24 | 1.24 | 1.24 | 1.17 | |
| Neuthane | 235TS | 235DS | 235DS | 242S | 242S | ||
| %NCO (mid-point) | % | 3.5 | 3.5 | 3.5 | 4.2 | 4.2 | |
| Curative | MOCA | MOCA | CA6 | MOCA | CA6 | ||
| Mix Ratio Curative per 100 Parts Resin | % | 10.6 | 10.6 | 8.5 | 12.7 | 10.2 | |
| Recommended Stoichiometry | by weight | 95 | 95 | 95 | 95 | 95 | |
| Resin Process Temperature | °C | 85 | 75 | 75 | 80 | 80 | |
| Curative Temperature | °C | 110 | 110 | 20 - 25 | 105 | 20-25 | |
| Recommended Mould Temperature | °C | 90 | 90 | 90 | 95 | 95 | |
| Resin Viscosity (100°C /Process Temperature) | cPs | 950 / n.a. | 800 / 1985 | 800 / 1985 | 700 / 1800 | 700 / 1800 | |
| Pot life (on a 500g mix) | minutes | 9 | 7.5 | 5 | 8 | 3.5 | |
| Recommended Cure Temperature / Time | °C / hrs | 90 / 16 | 90 / 16 | 90 / 16 | 95 / 16 | 95 / 16 | |
| Hardness | DIN 2240-91 | Shore A | 86 | 86 | 84 | 92 | 93 |
| DIN 2240-91 | Shore D | - | - | - | |||
| 100% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
500
(3.45) |
718
(4.95) |
1470
(10.14) |
1330
(9.2) |
1420
|
| 300% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
1100
(7.59) |
1420
(9.79) |
2580
(17.79) |
2600
(18.0) |
2360
|
| Tensile Strength | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
5700
(39.33) |
8360
(57.64) |
14600
(100.66) |
8700
(60.0) |
8250
|
| Elongation at Break | BS 903 Pt A2 - ISO 37 | % | 550 | 510 | 604 | 500 | 538 |
| Tear Strength | BS 903 Pt A3 - ISO 34-1 | lb/in
(KN/m) |
410
(71.8) |
225
(39.3) |
279
(48.7) |
610
(107.5) |
700
|
| Compression Set | BS903 Pt A6 - ISO 815 | % | 27 | - | 29 | 32 | 33.5 |
| Abrasion loss | DIN 53516 | mm³ | - | - | 39 | 42 | 19 |
| Resilience | ASTM D 2632-92 | % | 40 | - | 15 | 25 | 25 |
| Specific Gravity | g/cm³ | 1.24 | - | 1.22 | 1.27 | 1.21 | |
| Neuthane | 242 | 242 | 254 | 254 | ||
| %NCO (mid-point) | % | 4.2 | 4.2 | 5.4 | 5.4 | |
| Curative | MOCA | CA6 | MOCA | CA6 | ||
| Mix Ratio Curative per 100 Parts Resin | % | 12.7 | 10.2 | 16.3 | 13.1 | |
| Recommended Stoichiometry | by weight | 95 | 95 | 95 | 95 | |
| Resin Temperature | °C | 80 | 80 | 80 | 80 - 90 | |
| Curative Temperature | °C | 105 | 20 - 25 | 110 | 20 - 25 | |
| Recommended Mould Temperature | °C | 95 | 95 | 95 | 90 | |
| Resin Viscosity (100°C Process Temperature) | cPs | 830 / 1450 | 830 / 1450 | 800 /1000 | 800 /1000 | |
| Pot life (on a 500g mix) | minutes | 5 | 3 | 4.5 | 5 | |
| Recommended Cure Temperature / Time | °C / hrs | 95 / 16 | 95 / 16 | 95 / 16 | 90 - 100 / 16 | |
| Hardness | DIN 2240-91 | Shore A | 93 | 94 | 95 | 93 |
| DIN 2240-91 | Shore D | 45 | - | |||
| 100% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
1400
(6.7) |
1250
(8.6) |
2020
(13.9) |
1680
(11.6) |
| 300% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
2670
(18.4) |
2050
(14.1) |
4210
(29) |
3300
(22.8) |
| Tensile Strength | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
8110
(56.0) |
8545
(58.9) |
9030
(62.2) |
6000
(41.4) |
| Elongation at Break | BS 903 Pt A2 - ISO 37 | % | 520 | 680 | 460 | 500 |
| Tear Strength | BS 903 Pt A3 - ISO 34-1 | lb/in
(KN/m) |
660
(115.7) |
975
(170.5) |
715
(125.2) |
550
(96.3) |
| Compression Set | BS903 Pt A6 - ISO 815 | % | 28 | 34.2 | 29 | 41.5 |
| Abrasion loss | DIN 53516 | mm³ | 40 | 52 | 38 | 22 |
| Resilience | ASTM D 2632-92 | % | 27 | 24 | 30 | 30 |
| Specific Gravity | g/cm³ | 1.27 | 1.20 | 1.28 | 1.28 | |
They offer:
- long pot life
- excellent solvent swell resistance
- good cut resistance
- hardness range from <40 - 60A
- the option to be combined with fillers to reduce cost and improve grinding characteristics (Neuthane FP3)
Typical Applications
- Lacquer and paint applicator rollers and wheels (Neuthane 235, 234 & 242)*
- Isostatic bage (Neuthane 235)
- Printing rollers
Processing can be by hand or by dispensing machine
Hand Processing
- Melt prepolymer at 60-70°C for 16-24 hours
- Heat the prepolymer and curative to the recommended temperature
- Remove moisture from plasticiser or FP3 (after blending) under vacuum at 110-120°C
- Add pigments and Antifoam, as applicable, whilst mixing
- 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)
- If using more than one mix, blend to ensure homogeneity and mix 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
Alternatives
- Abrasion / Cut resistance - Neuthane 802 system [MDI Quasi] will offer an advantage
- Humid / Wet – PTMEG ether based systems should be considered: Neuthane 801 [MDI Quasi] or Neuthane 600 [MDI Prepolymer with Neuthane CA curative]
Neuthane 200 Series TDI - Ester Prepolymer (cured with Neuthane TMP/TIPA & Plasticiser)
| Neuthane | 234 | 235S | 235S | 239 | 242S | 242S | ||
| %NCO (mid-point) | % | 3.4 | 3.5 | 3.5 | 3.9 | 4.2 | 4.2 | |
| Curative * | TMP | TMP / TIPA | TMP / TIPA | TMP | TMP / TIPA | TMP / TIPA | ||
| Mix Ratio Curative per 100 Parts Resin | by weight | 3.57 | 4.06 | 4.06 | 3.97 | 4.87 | 4.87 | |
| Neuthane Plasticiser per 100 Parts Resin | by weight | 0 | 0 | 20 | 0 | 0 | 20 | |
| Resin Temperature | °C | 85 | 85 | 85 | 85 | 90 | 90 | |
| Curative Temperature | °C | 70 | 70 | 70 | 70 | 70 | 70 | |
| Plasticiser Temperature | °C | - | - | 85 | - | - | 90 | |
| Recommended Mould Temperature | °C | 110 | 110 | 110 | 110 | 110 | 110 | |
| Resin Viscosity (100°C / Process Temperature) | cPs | 400 / 1200 | 860 / 1413 | 860 / 1413 | 560 / 1200 | 700 / 1075 | 700 / 1075 | |
| Pot life (on a 500g mix) | minutes | 30+ | 30 | 30 | +120 | 30 | 30 | |
| Recommended Cure Temperature / Time | °C / hrs | 110 / 22 | 110 / 22 | 110 / 24 | 110 / 24 | 110 / 20 | 110 / 22 | |
| Hardness | DIN 2240-91 | Shore A | 53 | 50 | 40 | 52 | 62 | 55 |
| 100% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
148
(1.02) |
184
(1.26) |
141
(0.97) |
197
(1.36) |
359
(2.47) |
248
(1.71) |
| 300% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
354
(2.44) |
333
(2.29) |
251
(1.73) |
513
(3.54) |
1078
(7.43) |
631
(4.35) |
| Tensile Strength | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
1590
(10.96) |
2484
(17.12) |
2055
(14.16) |
1940
(13.38) |
5541
(38.20) |
2257
(15.56) |
| Elongation at Break | BS 903 Pt A2 - ISO 37 | % | 493 | 567 | 673 | 459 | 371 | 408 |
| Tear Strength | BS 903 Pt A3 - ISO 34-1 | lb/in
(KN/m) |
87
(15.23) |
153
(26.79) |
125
(21.89) |
113
(19.76) |
219
(38.35) |
178
(31.17) |
| Specific Gravity | g/cm³ | 1.21 | 1.19 | 1.18 | 1.26 | 1.20 | 1.19 | |
* For a detailed study on the effects of stoichiometry in relation to cured hardness stability please refer to Technical Library Document 027
...continued
Neuthane 200 Series TDI - Ester Prepolymer (cured with Neuthane TMP/TIPA & Plasticiser)
| Neuthane | 242 | 243MS | 250LS Low Solvent Swell |
254 | 270 | ||
| %NCO (mid-point) | % | 4.2 | 4.3 | 5.0 | 5.4 | 7.0 | |
| Curative * | TMP / TIPA | TMP | TMP | TMP / TIPA | TMP | ||
| Mix Ratio Curative per 100 Parts Resin | by weight | 4.87 | 4.56 | 5.09 | 6.26 | 7.35 | |
| Neuthane Plasticiser per 100 Parts Resin | by weight | 20 | 0 | 0 | 0 | 20 | |
| Resin Temperature | °C | 85 | 85 | 85 | 85 | 85 | |
| Curative Temperature | °C | 70 | 70 | 70 | 70 | 70 | |
| Plasticiser Temperature | °C | 90 | 0 | 0 | - | 90 | |
| Recommended Mould Temperature | °C | 110 | 110 | 110 | 110 | 110 | |
| Resin Viscosity (100°C / Process Temperature) | cPs | 830 / 1100 | 425 / n.a. | 940 / n.a. | 450 / 1000 | 300 | |
| Pot life (on a 500g mix) | minutes | 30 | 30+ | 30+ | 30 | 30+ | |
| Recommended Cure Temperature / Time | °C / hrs | 110 / 24 | 110 / 22 | 110 / 22 | 110 / 24 | 110 / 24 | |
| Hardness | DIN 2240-91 | Shore A | 53 | 58 | 75 | 65 | 60 |
| 100% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
203
(1.40) |
208
(1.43) |
535
(3.69) |
402
(2.77) |
273
(1.88) |
| 300% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
450
(3.10) |
522
(3.60) |
2470
(17.03) |
3000
(20.68) |
- |
| Tensile Strength | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
2331
(16.07) |
2830
(19.51) |
6890
(47.50) |
4298
(29.63) |
- |
| Elongation at Break | BS 903 Pt A2 - ISO 37 | % | 491 | 456 | 372 | 311 | 159 |
| Tear Strength | BS 903 Pt A3 - ISO 34-1 | lb/in
(KN/m) |
143
(25.04) |
96
(16.81) |
204
(35.72) |
175
(30.64) |
79.7
(13.95) |
| Specific Gravity | g/cm³ | 1.19 | 1.20 | 1.26 | 1.19 | 1.17 | |
* For a detailed study on the effects of stoichiometry in relation to cured hardness stability please refer to Technical Library Document 027
Neuthane™ 200 Series TDI - Caprolactone Ester Prepolymers (60 - 95 Shore A)
Properties
The Neuthane 200 Caprolactone series are high perfomance TDI – ester prepolymers designed to produce items for use in arduous application areas. They offer advantages over conventional ester TDI prepolymers in several key areas.
They offer:
- a high level of physical properties
- good cut and abrasion resistance
- good chemical resistance
- good low temperature flexibility
- low viscosity and long pot life*
- improved hydrolysis resistance*
- improved dynamic performance*
- low hardness with MOCA
* Compared with conventional TDI ester prepolymers
Typical Applications
- Medium load roller coverings (e.g. steel industry)
- Roller coverings where lubricants are present (e.g. Dioctyl Sebacate)
- Mining and quarrying (e.g. screen decks, scraper blades)
- Oil and gas industry (e.g. gaskets)
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
- 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
- Avoid prolonged storage of prepolymers at elevated temperatures. This will result in low hardness and lower properties of the cured material
- It is important when processing Neuthane 230 that the correct temperatures are maintained. Failure to do so may result in incorrect cured hardness
- Avoid moisture contamination of all materials
- Part used containers should be flushed with dry nitrogen and resealed immediately after use
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]
- Cost – Conventional ester based systems will offer a price advantage: Neuthane 200 [TDI], Neuthane 802 [MDI Quasi]
- Solvents – Conventional ester TDI offer the best performance
Neuthane™ 200 Series TDI - Caprolactone Ester Prepolymers (60 - 95 Shore A)
| Neuthane | 230 | 230 | 232 | 244 | 251 | 255 | 255 | ||
| %NCO (mid-point) | % | 3.2 | 3.2 | 3.2 | 4.4 | 5.1 | 4.4 | 4.4 | |
| Curative | MOCA | CA6 | MOCA | MOCA | MOCA | MOCA | CA6 | ||
| Recommended Stoichiometry | % | 95 | 95 | 95 | 95 | 95 | 95 | 95 | |
| Mix Ratio Curative per 100 Parts Resin | by weight | 9.92 | 7.95 | 9.7 | 13.3 | 15.4 | 16.6 | 13.3 | |
| Resin Temperature | °C | 80 | 80 | 80 | 70 | 70 | 70 | 70 | |
| Curative Temperature | °C | 105 | 20 - 25 | 110 | 110 | 110 | 110 | 20 - 25 | |
| Recommended Mould Temperature | °C | 90 | 90 | 90 | 90 | 90 | 90 | 90 | |
| Resin Viscosity (100°C/Process Temperature) | cPs | 650 / 1125 | 650 / 1125 | 710 / n.a. | 500 / n.a. | 343 / n.a. | 500 / 1238 | 500 / 1238 | |
| Pot life (on a 500g mix) | minutes | 18 | 13 | 14 | 9 | 6.5 | 9 | 6.5 | |
| Recommended Cure Temperature / Time | °C / hrs | 90 / 20 | 90 / 20 | 90 / 18 | 90 / 18 | 90 / 18 | 90 / 18 | 90 / 18 | |
| Hardness | DIN 2240-91 | Shore A | 59 | 78 | 80 | 90 | 92 | 95 | 91 |
| DIN 2240-91 | Shore D | - | - | - | - | - | - | ||
| 100% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
255
(1.76) |
715
(4.93) |
560
(3.9) |
1200
(8.3) |
1080
(7.4) |
1600
(11.0) |
1570
(10.82) |
| 300% Modulus | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
400
(2.76) |
1260
(8.68) |
1130
(7.8) |
2500
(17.2) |
3890
(26.8) |
3000
(20.7) |
3280
(22.61) |
| Tensile Strength | BS 903 Pt A2 - ISO 37 | lb/in²
(Mpa) |
2920
(20.13) |
5685
(39.2) |
6580
(45.4) |
6700
(46.2) |
8340
(57.5) |
7000
(48.2) |
8700
(59.98) |
| Elongation at Break | BS 903 Pt A2 - ISO 37 | % | 475 | 517 | 400 | 350 | 400 | 300 | 489 |
| Tear Strength | BS 903 Pt A3 - ISO 34-1 | lb/in
(KN/m) |
172
(30.12) |
392
(68.65) |
350
(61.0) |
490
(85.7) |
480
(84.2) |
550
(96.2) |
617
(108.05) |
| Compression Set | BS903 Pt A6 - ISO 815 | % | 17 | 35 | 39 | 40 | 32 | 45 | 47.7 |
| Abrasion loss | DIN 53516 | mm³ | 38.3 | 54.8 | 49 | 49 | 38 | 49 | 58 |
| Resilience | ASTM D 2632-92 | % | 24 | 50 | 42 | 35 | 22 | 33 | 25 |
| Specific Gravity | g/cm³ | 1.12 | 1.11 | 1.14 | 1.14 | 1.15 | 1.14 | 1.14 | |
Information contained in the data above 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.