This division of the company is responsible for the production of components machined to a very high accuracy, from engineering laminates and composites.  Laminates are made from layers of reinforcing materials e.g. paper; cotton fabric; woven glass cloth; or random glass mat; which have been impregnated with a thermo-setting resin then bonded together by baking under pressure.

Composites are made by combining reinforcing fibres with similar resin in other ways e.g. by pultrusion, filament winding etc.   Careful choice and the permutation of different resins such as phenolic, epoxy, silicone, polyimide etc. combined with different reinforcement, give a wide range of materials with  Electrical, Mechanical and Thermal characteristics to suit the application. The choice of the best  combination for the task requires a knowledge of what is available.

The main groups can be divided into the following categories :- 

• Synthetic Resin Bonded Paper : Made from Phenolic resin and Kraft or Cotton paper.

•  Synthetic Resin Bonded Fabric : Made from Phenolic resin and Cotton fabric.

• Polyester Glass Mat : Made from Polyester resin and random glass fibre.

• Epoxy Bonded Glass Fabric : Made from Epoxy resin and glass cloth.

• Silicone Bonded Glass Fabric : Made from Silicone resin and glass cloth.

• Polyimide Bonded Glass Fabric : Made from Polyimide resin and glass cloth.

• Epoxy Glass Mat : Made from Epoxy resin and random glass fibre.

• Integrated Mica: Made from Silicone resin bonded Mica platelets.

Comparative Table

This comparison indicates the relative properties for the very wide range of laminated insulation materials produced by the permutations of the different resin composition and reinforcing agents. Tensile strength is in Mpa ; Dielectric strength is in KV/mm.

Other materials include :-                                                          

• Presspahn : A high density Kraft paper used mainly in an oil environment but often in air, to provide an effective insulating barrier.

• Elephantide : as above but made from Cotton fibre paper.

• Nylon: In sheet or bar form machined to produce slide inserts etc.                       

• PVC : Polyvinyl Chloride in clear or coloured sheets cut and formed to create transparent covers and barriers

• Acrylic : Perspex is used primarily for transparent covers.

• Polycarbon.: this very tough, virtually unbreakable, material is also used to make transparent covers.

Decades of experience in the use of these materials in Electrical Engineering applications and in the special machining techniques required, is available on request.

Address your enquiry to Philip Williams as shown on the Home Page

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