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Crow Brand TUFNOL

Cotton fabric laminate

Medium weave cotton/phenolic resin laminated plastic

(SRBF - Synthetic resin Bonded Fabric)

 

A low cost general purpose grade for mechanical applications.

Crow Brand TUFNOL is a coarse weave grade for mechanical applications, where tough, rugged components are needed.  It has excellent impact strength with good general toughness and wear resistance.  It is suitable for electrical insulation at low voltages.

 

What is Crow Brand used for?

Crow Brand is used for mechanical applications and general uses, particularly for large components, or where fine surface finish is not a prime requirement, e.g. for large gears, jigs, wearing components, large rollers, impact blocks and many heavy duty components.

 

TYPES AVAILABLE

Crow Brand TUFNOL

 

Types available.

 

Sheets

 

Rods

 

Tubes

 

Other sections

Natural colour Crow Brand

 

Yes

Yes

Yes

Use Whale Brand

Graphite-impregnated Crow Brand

Yes*

Yes*

Yes*

 

 

 

 

 

 

 

* Minimum order quantities may apply.



SPECIFICATIONS for Crow Brand TUFNOL

 

BRITISH STANDARDS

Current Standards

Recent Standards (now obsolete)

Sheet

BS EN 60893-3-4 Type PF CC 201

BS 2572 Type F3

Round Rod

BS EN 61212-3-3 Type PF CC 43

BS 6128 Part 2 Type PF CC 25

Rectangular Bar

BS 6128 Part 4 Type PF CC 45

 

Hexagon Bar

BS 6128 Part 6 Type PF CC 65

 

Round Tube

BS EN 61212-3-2 Type PF CC 34

BS 6128 Part 9 Type PF CC 94

Rectangular Tube

BS 6128 Part 13 Type PF CC 134

 

NEMA*

 

 

Sheet

NEMA LI-1-1983 Type C

 

 

*Testing and certification to these standards is subject to special enquiry.   Standard quality testing is to British Standards.



PHYSICAL PROPERTIES

Crow Brand TUFNOL Sheet

 

PROPERTY

TYPICAL RESULT

UNITS

Cross breaking strength

130

MPa

Impact strength, notched, Charpy

13.5

kJ/m2

Compressive strength, flatwise

315

MPa

Compressive strength, edgewise

185

MPa

Shear strength, flatwise

90

MPa

Tensile strength

68

MPa

Young's modulus

6.3

GPa

Water Absorption

 

 

- 1.6mm thk.

100

mg

- 3mm thk.

120

mg

- 6mm thk.

145

mg

- 12mm thk.

175

mg

Electric strength, flatwise in oil at 90ºC

 

 

- 1.6mm thk.

3.5

MV/m

- 3mm thk.

2.3

MV/m

- 6mm thk.

1.8

MV/m

Electric strength, edgewise in oil at 90ºC

10

kV

Insulation resistance after immersion in water

1x108

ohms

Relative density

1.36

-

Maximum working temperature**

 

 

- continuous

120

ºC

- intermittent

130

ºC

Thermal classification

Class E

-

Thermal conductivity through laminae

0.35

W/(mK)

Thermal expansion in plane of laminae

2.2

X 10-5/ K

Specific heat

1.5

kJ/(kgK)

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

 

Crow Brand TUFNOL Round Tube

 

PROPERTY

TYPICAL RESULT

UNITS

Axial compressive strength

160

MPa

Cohesion between layers

120

MPa

Water absorption

3.6

mg/cm2

Insulation resistance after immersion in water

6x106

ohms

Relative density

1.35

-

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

 

Crow Brand TUFNOL Round Rod

 

PROPERTY

TYPICAL RESULT

UNITS

Flexural strength

130

MPa

Water absorption

3.8

mg/cm2

Insulation resistance after immersion in water

6x106

ohms

Axial electric strength in oil at 90ºC

3

kV

Relative density

1.35

-

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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