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Bearing Material Datasheets

 

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:

  • Aliphatic hydrocarbons
  • Paraffins
  • Alcohols
  • Petrol
  • Aromatic hydrocarbons
  • Tap and sea water
  • Chlorinated hydrocarbons

 

 

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 .

 

 


 

 

 

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