Thermoset Laminates
 
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Require little or no lubrication
Tolerant of misalignment
Prevent seizing of metallic parts
Provide controlled friction
Good abrasion resistance
Good chemical resistance
Absorb shock loads
Cost effective

NF Grades
An anti-scuffing resin reinforced with organic fibre to give high compressive strength, good impact resistance and low compressive modulus. NF contains a dry lubricant to provide lower friction and wear.

 

NF22 The rod and tube equivalent of NF21, retaining all the same properties. NOTE: for bushes machined from rod, the inside diameter should not be less than


NF21A general purpose bearing laminate available as flat sheet or simple moulded shapes such as bearing shells, channel sections, dished or hemispherical bearings.

 
NF22 Size Range
Rod Minimum Diameter 25 mm
Maximum Diameter 80 mm
Maximum Length 640 mm
Tube Minimum I/D 20 mm
Maximum O/D 350 mm
Maximum Wall Thickness 40 mm
Maximum Length
(depending on O/D) 		80 mm
NF21 Size Range
Sheet Maximum Length 1475 mm
Maximum Width 610 mm
Thickness 3 - 150 mm

L Grades
Phenolic resin reinforced with organic woven fibres cured under heat and pressure. A dry friction modifier, evenly dispersed throughout its structure gives low friction and good wear life.		  
JL33 The tube equivalent of JL31 retaining all the same properties.
JL33 Size Range
Tube Minimum I/D 20 mm
Maximum O/D 350 mm
Maximum Length 610 mm
Maximum Wall Thickness 35 mm

JL31 A general purpose laminate available as flat sheet or simple moulded shapes.
 		 
JL41 Similar in general construction to JL31 but includes additional fillers to give improved compressive strength whilst retaining the other properties.
JL31 Size Range
Sheet Maximum Length 1220 mm
Maximum Width 1120 mm
Maximum Thickness 35 mm
Minimum Thickness 3 mm
JL41 Size Range
Sheet Maximum Length 1220 mm
Maximum Width 1120 mm
Maximum Thickness 35 mm
Minimum Thickness 3 mm


JLX75
This has a PTFE rich surface layer integrally moulded to a backing material identical to JL31. The PTFE gives a low friction working surface free from stick-slip combined with a good load bearing capability.

  
JLX75 Size Range
Sheet Maximum Length 1220 mm
Maximum Width 1120 mm
Maximum Thickness 35 mm
Minimum Thickness 3 mm

CL Grades
Phenolic resin impregnated cotton cloth material combining high compressive strength with resillience.

CL47 A general purpose laminae only available as flat sheet or simple moulded shapes e.g. channel sections or bearing shells.
  
CL48 Similar to CL47 but with an improved resin giving better dimensional stability at higher temperatures.
CL47 Size Range
Sheet Maximum Length 1220 mm
Maximum Width 1120 mm
Maximum Thickness 150 mm
Minimum Thickness 3 mm
CL48 Size Range
Sheet Maximum Length 1220 mm
Maximum Width 1120 mm
Maximum Thickness 100 mm
Minimum Thickness 3 mm

CY Grades
A high quality organic yarn impregnated with a special phenolic resin, formed into tubes by a filament winding technique and heat-treated. The manufacturing method enables a very wide range of tube sizes to be produced economically.

CY160LS A general purpose oil impregnated tubular material. Typical applications are ships stern shaft, rudder, and pump bearings where excellent dimensional stability is required under a wide range of operating conditions.		  
CY160LS Size Range
Tube Minimum I/D 10 mm
Maximum I/D 1600 mm
Maximum O/D 1700 mm
Maximum Wall Thickness 120 mm
MaximumLength
(depending on O/D)		 700 mm

NOTE: Suffix "S" is used when NF, JL, CL and CY grades are supplied impregnated with SAE 10 oil for lower wear and friction.
 
Physical and Mechanical Properties


Test directions for LAMINATED and WOUND thermoset materials.

The properties below are typical and are for general guidance only.

†Does not break cleanly. *Maximum temperature 80°C in aqueous solutions.
PROPERTY TEST
DIRECTION 		UNITS NF21
NF22 		JL31
JL33 		JL41 JLX25
JLX75 		CL47 CL48 CY160L
Ulitimate Compressive Strength A
kg/cm 2
1800 1400 1400 1400 2800 2800 1400
B
kg/cm 2
1000 850 1000 850 1600 1770 1300
Maximum Working Compressive Strength A
kg/cm 2
450 350 350 350 700 700 350
B
kg/cm 2
250 210 250 210 400 440 180
Ultimate Tensile Strength B
kg/cm 2
310 300 200 310 620 360 -
Shear Strength C
kg/cm 2
410 400 380 400 530 590 -
D
kg/cm 2
380 400 380 400 530 - -
Ultimate Cross-breaking Strength H
kg/cm 2
† 630 540 630 950 950 830
Compressive Modulus A/B
x10 3 kg/cm 2
41/- 33/62 35/65 33/62 42/- 50/- -
F/Z
x10 3 kg/cm 2
- - - - - - 27/56
Tensile Modulus B
x10 3 kg/cm 2
63 - 120 - - - -
Flexural Modulus A
x10 3 kg/cm 2
50 64 72 60 60 60 -
Impact Strength (IZOD) K
kJ/m 2
75 6 5 6 30 30 40
Hardness - Rockwell 85M 92M 85M - 100M 95M 53M
Coefficient of Linear Thermal Expansion A
x10 -5 /°C
6.0 3.2 2.6 3.2 3.6 3.2 2.6
B
x10 -5 /°C
4.0 1.2 1.2 1.2 3.0 3.4 1.7
Maximum Working Temperature Continuous °C 100* 120 120 120 120 120 100
Occasional °C 120* 140 140 140 140 140 120
Swell in Water (From fully desiccated to fully saturated) A % 1.0 1.8 1.0 1.8 3.0 1.7 1.0
B % 1.0 0.5 1.0 0.5 1.5 0.7 1.0
Density -
g/cm 3
1.64 1.39 1.68 1.50 1.34 1.30 1.58

Friction and Wear


Method of Test

Friction-Load
A Railko test method, using a specimen of material, in the form of a thrust ring, rotating against a fixed hard chromed counterface (0.1 µm Ra), is used to obtain these results, which should be used for comparison purposes only.

  


Scar Wear
A test method, devised by the Railko laboratory, has been applied to obtain the results, which should be used for comparison purposes only.
Shaft Material high carbon steel BS1407
Surface Finish 0.13 µm Ra
Shaft Diameter 25.4mm
Shaft Speed 41.8m per minute
No of specimems per test 5


PV Curves

These are given as a good practical guide to the capacity of Railko materials when used as fixed plain bearings supporting a rotating shaft. Unless otherwise stated, the figures are shown assuming dry material running without lubrication.
In cases where lubrication is employed, the PV can be multiplied by the correction factor Z as defined in the table:

Z Operating conditions
1 unlubricated dry material
2 material oil impregnated but with no subsequent lubrication
3 oil lubricated material with further periodic oil or grease lubrication
6 oil lubricated material with a full flow lubrication system






Please note: All work must be carried out within the COSHH Regulations 1994. Any further information can be obtained either from Railko Limited or your nearest area office of the Health and Safety Executive.