PRODUCT INFORMATION
PRODUCT NAME: Maritex grade 1810
MATERIAL DESCRIPTION:
• C omposite.
• Free of graphite and molybdenum disulphide.
• Free of electrically conductive materials
• Heat and pressure formed.
• Non-melting.
• Dimensionally stable.
• Colour: Maritex red.
RESIN: Phenolic containing non-leaching lubricants .
REINFORCEMENT: Woven composite fibre .
APPLICATION:
• A general purpose plain bearing material.
• For high-speed applications it may be used with water. A special SG version may be used with oil.
• For low speed applications it may be used dry or with water or grease lubrication.
• Typical applications include stern tubes, rudders, pumps, grain augers, wash cranks and rotary compressor vanes.
GENERAL:
• Maritex grade 1810 has proved to be outstanding in a number of applications.• It is mechanically strong and does not melt or flow at high temperature or pressure.
• It has successfully replaced a number of thermosetting, thermoplastic & metallic bearing materials.
• It is easily machined at moderate to low speeds with a sharp positive rake tip or with a sharp negative rake tip that has a chip breaker.
Maritex grade 1810 bearings feature an exclusive composite structure. This unique composite is dimensionally stable and exhibits outstanding low moisture swelling. These properties permit running clearances and lubrication channels to be moulded * during manufacture. Continuous layers of woven reinforcement are formed around the lubrication channels and greatly strengthen the bearing. A built-in combination of non-leaching solid and non-leaching oil based lubricants permit extended " dry running time " a most useful feature for any high-speed shafts. In some vertical pump applications, a certain amount of "dry running" (while undesirable) in practice is unavoidable and has led this grade to become the bearing of first choice, clearly outperforming an impressive list of competitors.
* This feature is available for many standard imperial (and some metric) shaft sizes from ¾" to 4" as well as larger sizes. (Larger and non standard sizes generally will require internal as well as external machining of the bearing).
IMPORTANT:
For all high speed applications (eg. Propeller and turbine shafts) grade 1810 requires continuous lubrication and cooling with water. Running clearances indicated are for water temperatures less than 50°C. Should the water exceed this temperature, additional running clearances will be necessary .
NOTE:
For extremely hot water / boiling water / steam condensate, Maritex Grade 1613 should be considered .
TYPICAL PROPERTIES MARITEX GRADE 1810
THERMAL
Max operating temperature dry conditions 120ºC
Coefficient of thermal expansion ºC
Transverse Longitudinal
19 ~ 22 2.4 x 10¯ 5 3.3 x 10¯ 5
22 ~ 100; 3.3 x 10¯ 5 4.5 x 10¯ 5
Coefficient of thermal conductivity: 0.3w/mk
MECHANICAL
Type General Standard MinValue Unit
Tensile Longitudinal to laminate ASTM D638 1997 45 MPa
Compression Longitudinal to laminate ASTM D695 1996 100 MPa
(A bearing hollow cylinder 25 x 35 x 70len compressed longitudinal to laminate)
Com. Modulus Longitudinal to laminate ASTM D695 1996 4 GPa
Com. Axial Transverse to laminate Maritex Test No 1* 110 kN
*(A bearing half shell 25 x 35 x 25len compressed transverse to laminate)
Shear Transverse to laminate ASTM D732 1993 80 MPa
Impact Charpy Transverse to laminate AS 1146.2 1990 7 kJ/m²
Impact Charpy Longitudinal to laminate AS 1146.2 1990 9 kJ/m²
Hardness Transverse to laminate ASTM D-2583 30~40 Barcol
(934-1)
Hardness Longitudinal to laminate ASTM D-2583 20~30 Barcol
(934-1)
CHEMICAL
Maritex grade 1810 material is resistant to the following solvents:
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Limitations: Grade 1810 is generally unsuitable where direct contact with oxidising acids or hot caustic solutions are likely to be encountered.
Grade 1110
Grade 1810
1810 Fitting Sheet
PLEASE READ THIS SHEET BEFORE INSTALLING THE BEARING
Thank you for choosing Maritex® bearings. Considerable effort has been made to ensure this product will provide outstanding value. However, an unsatisfactory installation will affect bearing performance and is beyond our control. Always check that bearing dimensions are correct relative to the shaft and carrier before installing the bearing. If you are unsure or do not understand any aspect before proceeding please contact your place of purchase and request additional information specific to your application. Maritex® Bearing Company Pty. Ltd. will endeavour to assist within 24 hours of receiving a request for information.
Calculate minimum running clearances (MRC) for continuous water lubricated high speed rotating shafts and Maritex® bearing grade 1810. MRC indicated below are intended for water temp range 10 ~ 40 deg. C. Operation with water temperatures outside this range are achievable but may require additional attention to clearances and the prospective user should seek technical assistance from Maritex®.
MRC = (OD ID)/2 x OD/ID X 0.014 + (shaft Ø X 0.001)
MRC = Minimum Running Clearance after insertion of bearing into carrier
OD = Nominal bearing outside diameter or carrier internal diameter
ID = Nominal bearing inside diameter or shaft diameter
Example: Find the MRC for a bearing to suit a 6 dia. shaft and 8 diameter carrier.
The formula works equally well with imperial or metric units but NEVER MIX IMPERIAL UNITS WITH METRIC UNITS OR VICE-VERSA.
Example: Find the MRC for a bearing to suit a 6 dia. shaft and 8 diameter carrier.
The formula works with imperial or metric units but NEVER MIX IMPERIAL UNITS WITH METRIC UNITS OR VICE-VERSA.
Imperial example
(8 6)/2 x 8 -:- 6 X 0.014 + (6 X 0.001) MRC = 0.0247 = 0.6265mm = 0.025 inches (Always round up)
Metric example
(203.2 152.4)/2 x 203.2 -:- 152.4 X 0.014+ (152.4 X 0.001) MRC = 0.6265mm = 0.0247 inches (Always round up)
Securing the bearing:
Non interference installation:
1) When dry, and fully inserted, ensure the bearing(s) can freely rotate in the carrier . Trial fit the shaft to verify bearings and shaft alignment are true. Mis-alignment severely reduces the life of a bearing and may accelerate shaft wear. Ensuring perfect alignment is well worth the extra effort.
2) Apply sufficient epoxy adhesive to bearing and carrier mating surfaces. This enables bearings to be supported and securely retained.
3) In addition to (2), a bearing can be secured with any recognised acceptable method of mechanical fixing provided bearing dimensional and structural integrity are maintained.
Interference installation:
4) Where an interference fit is required (1) & (2) do not apply. In conjunction with (3), the following formula may be used:
Bearing outside DIAMETER = CARRIER INTERNAL DIAMETER X 1.001
EG:
Imperial 4 diameter carrier machine the bearing OD to 4.004.
Metric 100mm diameter carrier machine the bearing OD to 100.1mm
Note: the abovementioned MRC formula takes no account of bore closure due to interference .
If interference fitting is required, due allowance for bore closure shall be made .
Maritex advanced composites
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