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Millathane® E34
A High Performance Millable Polyether Polyurethane
Rubber
Download MSDS and data sheet
Millathane E34 is a high performance polyether
millable urethane rubber which has been developed for applications requiring
high abrasion resistance, low temperature flexibility, ozone resistance, oil
and fuel resistance, outstanding hydrolytic stability and improved
processing. Millathane E34 compounds also have high resilience (high
rebound) characteristics.
Millathane E34 can be compounded and processed by the use of conventional
rubber manufacturing equipment. Millathane E34 can be mixed on two roll
mills or an internal mixer. Compounds can be calendered, extruded, or
injection, transfer or compression molded to produce finished polyurethane
parts.
Millathane E34 is typically vulcanized by the use of sulfur with thiazole
accelerators and can also be vulcanized by organic peroxides such as dicumyl
peroxide.
| TYPICAL POLYMER PROPERTIES |
| Chemical type |
Polyether polyurethane |
| Color |
Pale amber to dark |
| Physical form |
Solid bale or milled
sheets |
| Packaging |
|
|
Solid bale: |
38 lb (17.2 kg) carton |
|
Premilled sheets* |
50 lb. (22.7 kg) carton |
| Odor |
Faint, characteristic |
| Specific gravity |
1.04 |
Mooney viscosity,
ML(1+4)/100°C) |
35 – 65 (50±10 typical) |
| Storage stability |
3
years under dry and cool conditions |
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| TYPICAL COMPOUND
PROPERTIES |
| Hardness range |
40 to 90 A |
| Tensile strength |
Up
to 5000+ psi, (35+ MPa) |
| Tear
strength |
Up to 400 lb/in (70 kN/m) |
| Compression set |
Good |
| Heat aging 100º C (212º F) |
Good |
| Ozone
resistance |
Excellent |
| Hydrolysis resistance |
Very Good |
| Oil & fuel resistance |
Very Good |
| Low temperature |
- 62º C brittle point |
| Weathering |
Very good |
| Abrasion resistance |
Excellent |
| Resilience |
40-60% |
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TYPICAL END USES |
|
| Printing rollers |
Copier rollers |
| Drive Belts |
Radar dome covers |
| Conveyor Belts |
Footwear outsoles |
| Copier stops |
Cable jackets |
| Aircraft fasteners |
Dust covers |
PROCESSING
Millathane E34 is processed by techniques which are common to the rubber
industry. Compounds can be mixed on an open mill or in an internal mixer;
molded articles can be produced via compression, transfer or injection
molding; calendered sheets can be press or rotocured.
COMPOUNDING
Millathane E34 compounds typically contain reinforcing fillers to achieve
meet hardness and
mechanical strength requirements, but gum compounds, with little or no
fillers, have good properties. Reinforcing fillers like silica and small particle
carbon black are easily incorporated into Millathane E34. It is sulfur or peroxide-curable,
although the best properties are obtained with sulfur cures.
The best sulfur cure system is a combination of MBTS, MBT,
Thanecure® ZM,
and sulfur, with zinc stearate as an activator/process aid.
Any of the typical peroxides can be used for peroxide curing,
including dicumyl peroxide and DBPH. Coagents, such as TMPTMA (SR-350, from
Sartomer), are commonly used along with peroxides to modify hardness,
processing and other properties.
VULCANIZATION CONDITIONS
Compounds based on Millathane E34 are typically vulcanized at temperatures of 150º -
175ºC, depending on the cure system used, with typical cure times of 5 to 20
minutes for compression molded lab sheets.
FORMULATION EXAMPLE
| Millathane E34 |
100.0 |
| Zinc Stearate
|
0.5 |
| N330 Black |
25.0 |
| DBEEA (TP-95) |
5.0 |
| Process aid (Struktol WB222) |
1.0 |
| MBTS |
4.0 |
| MBT |
2.0 |
|
Thanecure® ZM |
1.0 |
| Sulfur |
1.5 |
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| Cured Properties, press cure 12'/160ºC |
| Hardness, Shore A |
62 |
| 100% Modulus, MPa |
2.8 |
| 200% Modulus, MPa |
6.4 |
| 300% Modulus, MPa |
11.2 |
| Tensile Strength, MPa |
28.7 |
| Elongation at break, % |
525 |
| Tear Die C, kN/m |
38.3 |
| Bashore Resilience, % |
53 |
| Compression Set, 22 hr/70ºC, % |
49 |
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