Tufnol Company Evolution
Tufnol (from the two words, “tough phenol”) was invented by a team employed by George Ellison in the s. Originally called ‘synthetic resin bonded paper’ or SRBP, it was created from layers of high quality kraft paper bonded together under high pressure with phenol formaldehyde resin. It was hard, strong and easily machinable. TUFNOL is a proprietary brand of non-metallic material used to make engineering components for a wide range of uses. This type of material is known as 'synthetic resin bonded laminated plastic', and is made from layers of paper, cotton cloth or woven glass fibre cloth, dipped in resin, then compressed and bonded together in a hot press.
The various grade of Tufnol are manufactured at their Birmingham, England factory and were one of the first non-metallic bearing materials to hit the market ks the 's. Originally used for switchgear, Tufnol now manufacture a wide range of materials for use in the marine, aerospace, railway, construction and electrical industries.
Tufnol's high resin content components are used in the manufacture of ocean-going vessels for:. Their resin based materials are unaffected by sea water and destiny how to get treasure key a low swell rate which is very predictable so that they can be very precisely designed and the stress accurately calculated.
The bearings ia water-lubricated so need no additional lubrication so no oil is used. Tufnol resin based components were originally used for the propeller shaft stave bearings of the QE2.
Tufnol resin amde are accepted wat. Appointed Australian Importer and Distributor. Fabric Laminates and Bearing Materials. Specifically designed for water lubricated marine propeller shaft and rudder bearings, can also be used in oil lubricated sterntubes.
Data Sheet. General purpose medium weave material suitable for gears, wear resistant components and low voltage insulation. Principle features are excellent electrical properties, good dimensional stability and outstanding machinability. PTFE impregnated cotton weave material, excellent mechanical strength, rigidity, toughness and good machining characteristics with the self-lubricating and low friction properties of PTFE.
First class electrical insulating materials with good dielectric strength and high insulation resistance. Used for a multitude of different mads at low, medium and high voltages, including such items as terminal boards, mounting panels, tag strips, coil formers, insulating sleeves id bushes, busbar supports, tool and instrument handles, coil supports, insulated enclosures, brush holders, insulating spacers and special purpose plugs and sockets.
This results in controlled flammability, good resistance to ignition and excellent low smoke and toxicity values. High quality epoxy resin bonded glass fabric laminates offering very high mechanical strength and low moisture absorption, combined with excellent electrical properties, under tufnl dry and humid conditions.
This ensures good performance in electrical applications at high frequencies. Bear Brand Tufnol Stave sections in dovetail housing ready for final machining to size. The uses for Tufnol grades is only limited by the imagination, we regularly supply the various grades Tufnol for the base plate of 3D printers, wear strips, croquet mallet heads, gears, pipe isolation plates, cryogenic tufnool supports, fan nose sections, isolation bushes, switch whst, instrument panels, sheave rollers as tfunol as propeller shaft and rudder bearings.
Tufnol's high resin content components are used in the manufacture of ocean-going vessels for: A Bracket bearings Stern tubes tufmol Bow thruster bearings Stave bearings Their resin tufbol materials are unaffected by sea water and have a low swell rate which is very predictable so that they can be very precisely designed and the stress accurately calculated.
Designing With Laminates TUFNOL laminates are non-metallic engineering materials fdom from layers of fibrous reinforcement, such as cotton cloth, paper or woven glass cloth, which are bonded together ahat high quality thermosetting resins. In manufacture, the paper or fabric is first impregnated with the resin. Then, layers of this impregnated material are pressed what atar do i need for primary teaching under high pressure and heated to about oC.
This causes chemical changes in the resin, making it harden, and fusing the laminate into a tough, strong solid. By using alternative resins with different types of how to select a charge controller and additives, a range of grades is created, with types to suit a wide variety of applications.
Also, by rolling or shaping the impregnated layers before pressing, stock shapes such as rods and tubes can be moulded. They are also extremely useful for electrical and thermal insulation. Designing Components Choice of Laminar Direction The designer who is considering using a laminate for a particular application should always bear in mind the fact that the madw has a laminar structure and therefore has different strengths in different mase relative to the layers.
It is therefore essential to ensure that the correct tutnol of material is chosen, so that the laminations lie in the best direction to deal with the stresses involved. Even where components are not required to withstand any load in use, machining to produce the component tjfnol causes stress. Lack of consideration for the structure of the laminate can lead to fracture during production, whay or transit. Ahat 2 illustrates several examples where the laminar construction has influenced the choice of section away from the most immediately obvious.
Many laminates are slightly sensitive to stress concentration and, as with other materials, wherever possible it is good design practice to avoid stress-raising features, such as sharp internal corners or sudden changes in section. Tolerances on standard sections High-pressure laminates cannot be moulded to precisely accurate dimensions and, when selecting sizes of standard materials for ordering purposes, an allowance should be made for the possible variations in, for example, the moulded thickness of a sheet or the concentricity of a rolled tube.
These are usually greater with the coarser reinforcing materials and reference should be made to the British Standard relevant to the particular type of laminate. Machining Tolerances and Finishes Owing to the nature of the material, components cannot normally be machined to the finest tolerances achievable with metals; however, the surface of a laminated plastics component has a slight resilience, which usually renders very fine wuat unnecessary for good fits to be achieved.
Laminated bushes require a greater interference than metal bushes so that the same machining tolerance becomes much less significant. On the other hand, when inserted, the laminated bush may compress slightly on the bore, so an allowance may have to be made for this when determining the size to be machined.
Similarly, the fibrous what would cause a car to die while driving of the reinforcement causes considerable difficulty in achieving fine surface finish readings on machined faces.
This obviously varies with different grades but, for example, a first-class milled face on a medium weave fabric laminate may record a surface finish of 3 to 4 micrometers to micro inches and even prolonged polishing may only reduce these figures by half. Once again, the resilient surface of the laminate usually makes fine finishes unnecessary. The milled face mentioned above would be entirely suitable as a bearing surface, without polishing.
The information above is extracted from Tufnol literature. Also available from C. Home Page. For further information, or to purchase Tufnol please contact us. South Australia. Ph: 08 E-mail: ceaco ceaco.
Customers who value our dependability
Tufnol Composites Ltd. began making “Tufnol” laminates over 80 years ago. Thousands of new uses are still created every year and many different grades are offered for specific uses. Vast quantities of machined components are supplied each week, custom made to our customers’ requirements. Tufnol - the byword for quality in laminated plastics and resin-based materials for engineering applications. Invented by us here in the UK, developed here over 80 years to the highest modern standards by skilled and experienced engineers. TUFNOL laminates are non-metallic engineering materials made from layers of fibrous reinforcement, such as cotton cloth, paper or woven glass cloth, which are bonded together with high quality thermosetting resins. In manufacture, the paper or fabric is first impregnated with the resin.
Tufnol Composites Ltd. Since our inception in the s we have prioritised the development and production of new materials, created special materials for specific purposes and generated many for bespoke customer projects. It was hard, strong and easily machinable. Originally used for switchgear, new ideas for its use proliferated and it came to be used for thousands of applications throughout industry replacing metals like cast iron, steel, brass and bronze in the mechanical engineering industry.
Work done by the Tufnol Research and Development team set up in the s has provided the basis for the modern, high performance Tufnol range available today. A new material made from polyimide resin that can survive exposure for long periods to very high temperatures was developed, creating another world-beating grade which effectively pushed out the leading edge of applications for which engineering plastics could be used. The importance of the properties of the many Tufnol resin materials and laminates has ensured their acceptance in a multitude of demanding applications in the aerospace, marine, mining, railway, electrical, offshore and construction engineering sectors.
Tufnol History Tufnol Composites Ltd. The development of Tufnol laminates Originally used for switchgear, new ideas for its use proliferated and it came to be used for thousands of applications throughout industry replacing metals like cast iron, steel, brass and bronze in the mechanical engineering industry.