Presspahn Fibre Jointing Washers

Presspahn Fibre Jointing Washers

Presspahn Fibre Jointing Washers

ASG stock sheets and rolls of Presspahn materials ready for supply or conversion.  Presspahn Fibre Jointing Washers are just one of many materials listed in our fibre jointing range used for the production of washers.

Presspahn, is also known in the industry as pressboard, press paper, presspahn transformer insulation paper and elephantide. Presspahn fibre jointing is often used for the production of electrical insulation washers as the material doesn’t allow the free flow of electrical current,  protecting electrical conductors from coming into contact with people or tools during installation, repairs or when an electrical appliance or device is being used.  

Presspahn Fibre Jointing materials are manufactured in a paper form on a roll available  in thicknesses from 0.13mm to 1mm thick and also in rigid board from 0.5mm to 25mm from which washers can be cut.   As well as selecting a suitable material, the quality of the cut is also major factor in producing a reliable and perfectly fitting washer, therefore we ensure our in-house manufacturing team follow our customers drawings or samples which detail the Outer Diameter (OD), Internal Diameter (ID) and the thickness, in order to create an exact match reducing the risk of the washer failing when it is placed within its application.   

A combination of a skilled workforce and high spec machinery including a range of presses and CNC machines allows us to produce Pressphan fibre jointing washers in a wide range of sizes and quantities with or with self adhesive faces.

Product Enquiry

For information on Presspahn Fibre Jointing Washers please complete the following quick enquiry or call us on +44(0)1384 252555.

    Characteristics of Presspahn Fibre Jointing

    • Colour: Natural/brown
    • Thickness:
      •  Presspahn Paper: 0.13mm - 0.5mm
      • Presspahn Board: 1mm - 25mm
    • Density: 1-1.3g/cm
    • Voltage Strength (in oil): 35-40Kv/mm (depending on thickness)Temperature:  105℃

    Full technical data can be supplied upon request,
    or downloaded from our online portal.

    What are Presspahn Fibre Jointing Washers?

    Sponge or rubber materials are often the first choice  when customers are looking for a compressible material for sealing and jointing applications, however in many cases,  a ‘fibre’ based material could also be an option.  A Fibre jointing  material is made of fibre strands held together with a resin and then compressed under extreme pressure to create the rigidity and usable material.

     Presspahn washers are a flattened ring  material which are placed between two surfaces in order to reduce friction, unsteadiness and in this case to create an insulating barrier.  Presspahn Fibre Jointing washers are formulated to create barriers, restricting the free-flow of electrical current. 

    Presspahn Fibre Jointing washers are produced using electrical grade kraft wood pulp, designed as a surface insulation material on cellulose for insulation class A and can withstand high heat exposure for short periods of time.  Presspahn materials are available in paper and board form, in a choice of different thicknesses both of which can be used to manufacture washers.


    Why use Presspahn Fibre Jointing Washers?

    With a raised awareness of environmental and health & safety issues, more care is taken when manufacturing electrical equipment and machinery and the components used within them.   

    Presspahn Fibre Jointing papers and boards are cut into parts such as washers for use as spacers which create electrical barriers, restricting the free flow of current, protecting electrical conductors from coming into contact with tools and people during usage, repairs and installation. 

    Pressboard is just one of many Electrically Insulation materials supplied by ASG, often taken for its high chemical purity, mechanical strength and optimum oil impregnability.  These properties make the pressboard perfect for use within oil-filled power transformers and distribution transformers as well as an insulation material for electric machines and capacitors.

    Other Types of Fibre Jointing Materials available

    • Betaflex is a cellulose-based fibre material, which is made using a nitrile binder giving it excellent tensile strength,  low compressibility, good elastic recovery and erosion resistance.   Betaflex is used widely in the industrial and automotive sectors due to its resistance to oils. petrols, diesel and even antifreeze.
    • Ceramic Fibre material is constructed using ceramic fibres and an organic binder, designed for extreme temperature applications reaching up to 1250℃.    Ceramic fibre roll materials have excellent strength and flexibility, excellent insulating properties and thermal resistance.
    • Gasket Paper has a high resistance to petrol, oil and water, therefore often utilised within automotive applications (within fuel/oil pumps and filters).  It is not recommended for industrial use due to its lack of resistance to chemicals and heat. 

    Benefits of using Presspahn Fibre Jointing

    • Can withstand high heat for short periods of time high
    • Utilised in 105ºC rated (Class A) electrical applications
    •  Excellent mechanical strength and absorption characteristics
    • Can be punched, folded and cut
    • Good machinability
    • Available in rigid board or flexible paper

    Advantages of Using Presspahn Fibre Jointing Washers

    Presspahn fibre jointing components such as washers are highly utilised within transformer and other power transmission equipment offering an excellent insulating structure.   Presspahn fibre jointing washers offer properties including resistance to ageing, insulation performance and mechanical properties as well as being available in a choice of rigid board and paper variants. 

    Presspahn Fibre Jointing can be taken in full rolls or sheets of material for conversion into washers at a later date, or alternatively sawn, routered and pressed into bespoke washers here onsite at Advanced Seals & Gaskets Ltd and supplied as finished parts.  During the formulation of the raw material, the compound is treated through several non-chemical processes, ensuring maximum purity free from fillers and impurities allowing for the material to be used in even the more stringent applications. 

    Presspahn Fibre Jointing washers offer excellent mechanical strength and oil penetration therefore suitable for both dry and oil based transformers and other equipment and can be used across a range of currents and voltages.  Some of the applications in which washers cut from Presspahn fibre jointing papers can be found include insulation within cables carrying electrical current or signals such as telephone cables, power cables, capacitors and even submarine power cables, whereas the washers cut using presspahn fibre jointing boards are more often found as transformer boards in oil-filled transformers as an insulating structure.

    Have a Question about Presspahn Fibre Jointing Washers?

    Please contact us using the form below or by calling us on +44(0)1384 252555.