Leader in machined plastics and resin bonded fabrics Engineering plastics and composites

TUFNOL Tufset

Engineering plastic material

Tufset rigid polyurethane


  -  Available in stock shapes or mouldings.

  -  Bar up to 150mm diameter.

  -  Plate up to 100mm thick.

  -  Easily machined to a clean, burr-free finish.

  -  Good resistance to chemicals, weather and U.V. radiation.

  -  Good electrical and mechanical properties.

  -  Low water absorption.

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A unique material for machined plastic parts

Tufset polyurethane is an engineering plastics material made from high quality rigid polyurethane, specially formulated for TUFNOL Composites Ltd.  It is produced in standard forms of round bar and plate for machining into engineering components.  Tufset polyurethane can also be used for moulded components and, as the process is the same, the characteristics of the components will be similar whether machined from stock shapes or produced as mouldings.

 

Tufset polyurethane is an exclusive TUFNOL product and is available as round bar and plate from all TUFNOL Composites Ltd outlets.   A machined and moulded parts service is provided by TUFNOL Composites Ltd through its U.K. factory and a special fast despatch machining facility is also available to meet urgent demands.

 

Characteristics

 

Tufset polyurethane is a thermosetting plastics material which looks and feels rather like a thermoplastic material.

 

In addition to its good electrical and mechanical properties, Tufset polyurethane has excellent fatigue resistance and good resistance to stress cracking.  It resists attack from many chemicals and is unharmed by exposure to the atmosphere.  To all these plus factors is added low water absorption, good dimensional stability and a hard, abrasion resistant surface with low friction.

 

Working Temperature

 

Tufset polyurethane retains useful mechanical properties at low temperatures but, due to the effect of softening at temperatures above ambient, it should not normally be selected for applications where raised temperatures are involved.

At low temperatures, it should be noted that Tufset polyurethane retains its physical properties very satisfactorily down to minus 100ºC (minus 150ºF).

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Chemical Resistance

 

Tufset polyurethane is resistant to dilute acids and alkalis, oils and a wide range of environmental conditions encountered in engineering applications.

 

Water Absorption

 

The water absorption of Tufset polyurethane is exceptionally low and dimensional stability is, therefore, very good.  In addition, its properties are not significantly affected by long-term immersion in water.

 

Weather Resistance

 

Long exposure to outdoor weather conditions has no appreciable effect on Tufset polyurethane, apart from a slight tendency to yellow when exposed to strong U.V. light.

 

Abrasion Resistance and Bearing Properties

 

Polyurethanes in elastomeric forms are renowned for their abrasion resistance and bearing properties.  Whilst Tufset is a rigid form of polyurethane, it nevertheless retains good basic characteristics and is a useful material for engineering components operating in wearing and bearing applications.

 

Colour

 

Standard Tufset polyurethane is pale blue in colour.  However, subject to a minimum order quantity of 3,000 kilograms, Tufset polyurethane can be supplied in other colours to meet customer specifications.

 

What is TUFNOL Tufset used for?

Tufset polyurethane has proved to be a very versatile general-purpose engineering material and is used for many different applications in all types of manufacturing industry.  The ease with which it can be machined to a burr-free finish, coupled to its ability to use relatively cheap moulds, commend its choice for components where moulding quantities are eventually envisaged, especially where the component is large and chunky (over 1/2 kg).  In these circumstances, the use of Tufset polyurethane can be more satisfactory and cost effective than injection moulded thermoplastics, even for large quantities.

 

Typical Applications

 

Electrical

 

Insulation in industrial plugs and sockets, electronic assembly jigs, multi-track tape heads, stand-off insulators, printed circuit board testing boxes, transformer bushings, insulating parts in cable gland connectors, insulating blocks in T.V. cameras.

 

Mechanical

 

Model and pattern making, star wheels and guide plates, idler gears on textile machines, guides and wear strips in paper and board handling, bushes on ticket machines, scroll cams, spur and worm gears in welding machines, bearings in glass cutting plant, needle guides on carpet looms, bolster pads on hot stamping machines.

 

Chemical

 

Plating plant chain guide blocks, mixing bowls and hoppers, rollers and spacers in photo processing equipment, electro chemical machining jigs, components in contact with liquid helium and mercury, chemical cleaning fixtures.

 

Environmental

 

Yacht fittings, bushes on caravan towing gear, scaffold rail holders, bearings on cattle feed conveyors.

 

 

TYPES AVAILABLE

 

Sheets

 

Rods

Tufset Polyurethane – colour blue

Yes

Yes

Minimum order quantities may apply.

 

Click here for Tufset Polyurethane Standard Sizes



SPECIFICATIONS for TUFNOL Tufset


Tufset is manufactured and tested to Tufnol internal quality standards.



PHYSICAL PROPERTIES

Tufset Grade R/1

 

PROPERTY

TYPICAL RESULT

UNITS

Flexural Strength

65

MPa

Compressive Strength

60

 

Impact Strength, Charpy

4.0

kJ/m2

Impact Strength, Izod

0.9

ft-lbf/inch

Specific Gravity

1.2

-

Shore hardness

76

-

Water Absorption

38

mg

Water absorption (ASTM)

0.1

%

Dielectric strength (ASTM)

150

V/mil

All tests to IEC test methods, except where specified.

Whilst all data in this publication are offered in good faith, conformity with the properties stated cannot be guaranteed. IEC test methods are used for quality control purpose