DuraBlue Greaseless Composite Rudder Bushing
DuraBlue Composite Rudder Bushings, Thrust Washers and Wear Pads
outperform competitive bushingsHigh performance, pollution free, engineered technology.
Duramax Marine, the world leader in water lubricated bearing technology, offers an engineered, dimensionally stable rudder bushing and thrust washer designed to outperform competitive products. DuraBlue needs no lubrication and is exceptionally wear-resistant, with an extremely long wear life. DuraBlue composite material has a low coefficient of friction value of 0.1 to 0.2, resulting in no stick-slip during rudder operation. DuraBlue is also available in standard sheet stock and custom machined components for use in wear pad marine applications.
Benefits of DuraBlue greaseless composite material.
Virtually no swelling in seawater
High strength-to-weight ratio
Self-lubricating formulation for dry running
Chemical and corrosion resistant
Proprietary fiber matrix extends wear life
Very low thermal coefficient of expansion
Easy to machine
Easy to install
DuraBlue Is An Engineered Composite Material.
No lubrication is required
.Duramax DuraBlue has a proprietary lubrication formulation integrated evenly in its resin system. Needs no grease or oil, eliminating the risk of costly marine pollution fines. It will operate wet running, or run dry over extended periods of time without lubrication.
DuraBlue is chemical and corrosion resistant.
DuraBlue remains stable in chemical solutions and not affected by many solvents, inorganic solutions, fat and weak acids. It is non-metallic, non conductive and corrosion resistant.
Minimum thermal expansion and contraction.
DuraBlue has a low thermal expansion rate in high and low temperature environments. Unlike polyurethane rudder bushings that have a wide range of thermal expansion and contraction rate that can affect the interference needed to hold the bushing in place.
Experiences no swell and is abrasion resistant.
DuraBlue has virtually no swell when operating in salt or fresh water environments with an absorption rate of < 0.5%. Resists abrasion and wear in the harshest of conditions.
| PROPERTY | UNIT | VALUE | ||
Compressive Strength (ASTM D695) |
MPa | Psi | > 207 | > 35,000 |
Shear Strength (ASTM D2344) |
MPa | Psi | > 13.8 | > 2,000 |
Modulus of Elasticity (ASTM D638) |
MPa | Psi | > 3,102 | > 450,000 |
Hardness (ASTM D785) |
Rockwell "R" | > 110 | ||
Density (ASTM D792) |
103 kg/m3 | lb/in3 | 1.25 | 0.045 |
Water Absorption (ASTM D570) |
% | < 0.5 | ||
Coefficient of Thermal Expansion (ASTM D696) |
10-6/°C | 10-6/°F | 43 | 24 |
Chemical Resistance |
NA | Good | ||
Color |
NA | Blue | ||
Maximum Temperature (ASTM D648) |
°C | °F | 100 | 212 |
Minimum Temperature |
°C | °F | < -200 | < -328 |
Advised Maximum Working Temperature |
°C | °F | 80 | 176 |
Typical Friction Value |
NA | 0.1 – 0.2 | ||
General Wear Resistance |
NA | Very Good | ||
Resistance Against Abrasive Wear |
NA | Good | ||
Deflection* |
in | < 0.010 | ||
* after 24 hour at 15 N/mm2
Duramax DuraBlue Compression Test
An independent laboratory static compression test on the DuraBlue composite material showed it exceeded 51,000 PSI.
An independent laboratory static compression test on the DuraBlue composite material showed it exceeded 51,000 PSI.
Absorbs stresses and high impact loads
Duramax DuraBlue rudder bushings are light in weight and engineered to better absorb the stresses and high impact loads associated with rudder applications than metal material alternatives like bronze, brass, nylon and other urethane based products. DuraBlue also works well with all corrosion resistant materials: 316 Stainless Steel, Inconel, Monel, Stellite and Gunmetal. DuraBlue bushings can better handle the damaging effects of misalignment and offers extremely smooth operation with specific pressure of up to 25N/mm2. A 4 to 32 micro inch surface finish is recommended to extend bushing life.
Tolerant to edge loading
The DuraBlue bushing is stable even with misalignments and tolerates edge loading. It is an engineered fiber composite material that maintains a high compression strength. It is lightweight and resists damage or fracture. With a high strength-to-weight ratio.
DuraBlue Bushings, custom fit to match your application.
DuraBlue Rudder Bushings can be easily machined.
DuraBlue Bushings are available in any size.
DuraBlue Bushings are available for any rudder diameter. The bushings can be supplied from our factory in unfinished tubes or we can supply fully machined ready for service.
Fitting methods for DuraBlue Rudder Bushings.
- Press Fit
- Freeze Fit
- Liquid Nitrogen (Vapor Method)
- Liquid Nitrogen (Immersion Method)
- Dry Ice and Alcohol Method
DuraBlue Thrust Washers and Wear Pads.
DuraBlue is an engineered thermoset composite solution that is excellent for thrust washer and wear pad applications. DuraBlue composite thrust washers are an environmentally friendly, cost-effective, grease-free alternative to traditional metallic materials such as brass. They can also be used in place of PTFE, UHMW, Cast Nylon and other Phenolics and composite materials.
Suitable for high load applications
DuraBlue composite engineered fabrics are impregnated with thermosetting resins, with solid lubricants dispersed evenly, along with proprietary additives. It has a low coefficient of friction and high load capacity that's excellent for thrust washers and wear pad applications when operating with intermittent or oscillating movements.
Flexible bonding ability
DuraBlue can be bonded to itself and metals such as bronze, brass, aluminum, and stainless steel using a two-part epoxy resin adhesive. Call your Duramax DuraBlue specialist for detailed instructions.
Custom inserts for easy fastening
DuraBlue composite wear pads can be held in place with countersunk screws and keeper plates. Wear pads can be held in place by metal inserts imbedded into the composite. Flat head screws, helicoils and Keenserts can be used to fasten wear pads in place.
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DuraBlue Composite Rudder Bushings
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DuraBlue Technical Manual
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DuraBlue® is
a registered trademark of Duramax Marine® LLC. |
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