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Bear Brand TUFNOL

Cotton fabric based laminate

Medium weave cotton/phenolic resin laminated plastic

(SRBF – Synthetic Resin Bonded Fabric)

 

For lubricated bearings.

Bear Brand TUFNOL is a cotton fabric grade specially formulated for use as a lubricated bearing material.  It has enhanced wearing properties  and dimensional stability and gives excellent performance in a multitude of bearing applications, using water as a lubricant, or more conventional oils or greases.  The low water absorption properties allow reduced clearances in bearings and also provide enhanced electrical insulation properties.

 

What is Bear Brand used for?

Bear Brand is used for a wide range of wearing and bearing applications, such as oil or grease lubricated bearings, slideways, water lubricated marine bearings, pump sleeve bearings, seal rings, mixer bearings, slipper pads, rolling mill bearings, guide bushes and a wide variety of components which are lubricated by the water-based process fluids in which they operate.

 

TYPES AVAILABLE

 

Sheets

 

Rods

 

Tubes

 

Other sections

Natural colour

 

Yes

Yes

Yes

Yes

Graphite-impregnated Bear Brand

Yes*

Yes*

Yes*

Yes*

Molybdenum disulphide impregnated

Bear Brand

Yes*

No

No

No

 

 

 

 

 

* Minimum order quantities may apply.



SPECIFICATIONS for Bear Brand TUFNOL

BRITISH STANDARDS

Current Standards

Recent Standards (now obsolete)

Sheet

Since the withdrawal of BS 2572, no British Standards or other national standards are applicable to Bear Brand Tufnol.  This grade is therefore now manufactured to in-house quality specifications of Tufnol Composites Ltd, based on the former BS 2572 Type F2/1.

 BS 2572 Type F2/1

Round Rod

BS EN 61212-3-3 Type PF CC 42

BS 6128 Part 2 Type PF CC 23

Rectangular Bar

BS 6128 Part 4 Type PF CC 44

 

Hexagon Bar

BS 6128 Part 6 Type PF CC 64

 

Round Tube

BS EN 61212-3-2 Type PF CC 32

BS 6128 Part 9 Type PF CC 93

Rectangular Tube

BS 6128 Part 13 Type PF CC 133

 



PHYSICAL PROPERTIES

Bear Brand TUFNOL Sheet

 

PROPERTY

TYPICAL RESULT

UNITS

Cross breaking strength

110

MPa

Impact strength, notched, Charpy

11.0

kJ/m2

Compressive strength, flatwise

290

MPa

Compressive strength, edgewise

210

MPa

Shear strength, flatwise

100

MPa

Tensile strength

58

MPa

Young's modulus

6.6

GPa

Water Absorption

 

 

- 3mm thk.

45

mg

- 6mm thk.

80

mg

- 12mm thk.

100

mg

Electric strength, flatwise in oil at 90ºC

 

 

- 3mm thk.

3.9

MV/m

- 6mm thk.

3.5

MV/m

Electric strength, edgewise in oil at 90ºC

15

kV

Insulation resistance after immersion in water

5x1010

ohms

Relative density

1.32

-

Maximum working temperature**

 

 

- continuous

120

ºC

- intermittent

130

ºC

Thermal classification

Class E

-

Thermal conductivity through laminae

0.29

W/(mK)

Thermal expansion in plane of laminae

2.7

X 10-5/ K

Specific heat

1.5

kJ/(kgK)

Test methods as BS EN 60893-2, where applicable.

 

Bear Brand TUFNOL Round Tube

 

PROPERTY

TYPICAL RESULT

UNITS

Axial compressive strength

170

MPa

Cohesion between layers

110

MPa

Water absorption

2.0

mg/cm2

Insulation resistance after immersion in water

1x108

ohms

Relative density

1.32

-

Test methods as BS EN 61212-2, where applicable.

 

Bear Brand TUFNOL Round Rod

 

PROPERTY

TYPICAL RESULT

UNITS

Flexural strength

110

MPa

Water absorption

2.0

mg/cm2

Insulation resistance after immersion in water

5x107

ohms

Axial electric strength in oil at 90ºC

6

kV

Relative density

1.32

-

Test methods as BS EN 61212-2, where applicable.

 

 

**Users of highly stressed components at temperatures approaching the maximum are recommended to seek further advice from Tufnol Composites Ltd.

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Tufnol Railway

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