Frequently Asked Questions
- ETFE Panels
- FEP Sleeves for Drying Cylinders
- Film and Sheet
- Flange Shields
- Heat Shrinkable Sleeving
- Holscot Deutschland
- Holscot Europe
- Lamp Protection
- Lined Chemical Equipment
- Spray Coatings
- The Company
The company was founded by a Dutchman and a Scotsman “Hol” “Scot” in 1970.
Overall there are six units in the Holscot Group. The Headquarters and primary manufacturing facility is in Grantham, UK. Holscot Northern Division is located in Leven, Fife in Scotland and handles the sales for Scotland and the North of England as well as being the manufacturing unit for Holscot FEP Flange Shields. FEP Shelman is located in Oldham and carries out the fitting of FEP and PFA Roller Covers but mainly focusses on fluoroplastic lining of chemical equipment. Cameron Coatings in Cinderford is a specialist coating applicator offering PTFE and decorative coatings. Holscot Europe in Breda, Netherlands is Holscot’s main sales office for mainland Europe whilst Holscot Deutschland in Ratingen Germany provides sales to the German market. More details can be found here.
Holscot is a privately owned UK registered Limited Company
Yes, Holscot runs a demanding quality system and is proud to have ISO 9001 accreditation. In addition, is an approved source to major companies such as Philips, Rolls Royce, British Aerospace, Pratt and Whitney, Bayer, BNFL and many more.
Holscot has a network of distributors across the world- primarily for its own range of heat shrinkable sleeving and roll covers. Contact Holscot Grantham here to ascertain if there is a distributor in your area.
Based in Breda in the Netherlands, the Sales team at Holscot Europe cover the Netherlands, Belgium, France, Luxemburg as well as Eastern Europe
Some small stocks of heat shrinkable sleeving are held in the warehouse in Breda as well as holding stocks for customers against call off orders to provide prompt delivery.
Primarily Dutch and English but also some German and French
Holscot Deutschland is the sales office for Germany, Austria and Switzerland and focusses primarily on the Holscot range of Heat Shrinkable Roll Covers.
German and English
No, but prompt deliveries can be arranged via Holscot Europe or Holscot UK.
Teflon® is the Registered Trade name of DuPont de Nemours which covers their PTFE, FEP and PFA fluoroplastic products. PTFE was discovered by Roy Plunkett in 1938 as a by-product of the refrigeration process. For more details see our Glossary section.
The way that all fluoroplastic products, PTFE, FEP, PFA and, to a certain extent, ETFE, achieve their non-stick capability is that they shed a molecule of themselves every time something passes over them, so the surface will always have a tendency to wear away. This applies to all types of fluoroplastics, including the spray coatings. There will always be some element of adhesion. As a result, some items will continue to stick – particularly hot melt adhesives. It is always advisable to conduct tests.
FEP, PFA, PTFE all have FDA approval. PTFE has been used extensively inside the human body
Holscot can extrude in FEP, ETFE and PFA in diameters from 3mm to 400mm and thicknesses from 0.1mm to 3mm.
Working with highly experienced Masterbatchers, Holscot can extrude tubing in virtually any colour. A minimum extrusion run is required.
Only one resin is available which is truly conductive and that is PFA. It is possible for Holscot to extrude this against a minimum production run
Again this can be considered against a minimum production run for special applications and designs.
Yes, Holscot has completed projects where a continuous length of over 2.5km long of ETFE tubing has been produced for offshore applications.
Yes, Holscot has completed projects to produce thin gauge FEP supplied as a Layflat tube in a continuous coil.
With 97% UV transmissivity and a resistance to the high temperature experienced at the end of the lamps FEP is the material of choice for long-life white lights and UV insect killing lamps.
Yes. Holscot manufactures welded pouches for all sizes of compact U shaped lamps
Yes. The Circular Insect Killing Lamps can be protected with FEP.It is a difficult task but Holscot carries out the work within the group.
Yes. FEP is resistant to temperatures up to 150 deg C
97% for UVA and UVB light. Around 60-80% for UVC depending on the application.
A percentage of each batch of lamps Holscot covers are subjected to a 4m drop test whereby the covered lamp is dropped from a height of 4m onto concrete to ensure all the glass is contained.
Yes. The majority of Holscot’s customers send their free issue lamps to Holscot’s headquarters where they are covered, repacked and returned. For more distant territories, this is not cost effective or practical. In this case, Holscot can supply rolls of heat shrinkable sleeving for customers to fit themselves. This can be done using either a tunnel oven or a steam chamber – either of which can also be supplied by Holscot.
Each lamp which has an FEP covering is fitted with a band at one end so that they can be identified from a distance as being protected.
It depends on the size. Anywhere between 30 and 50%. The range of diameters which are fitted by each size of sleeve can be seen at the Heat Shrinkable Sleeving section here. It has been designed so that, even at the smallest diameter, the fit is tight once the sleeve is shrunk.
Shrinkage will begin at 100oC but Holscot recommends the use of more powerful hot air guns, such as the Leister Electron, which delivers up to 600oC. Full installation instructions can be found here.
FEP has a suggested maximum operating temperature of 150 deg C. PFA has a theoretical operating temperature in excess of 200 deg C. Bonded sleeves of either material have a maximum operating temperature of 150 deg C. The exception to this is extrusion/lamination rollers. More details of that application can be seen in the case histories section.
Yes. Holscot will provide DVDs and written installation instructions but, if more hands on help is needed, Holscot can send engineers to site anywhere in the world. Alternatively, training courses are available for customers’ own engineers at our FEP Shelman factory in Oldham. Over a two day period, engineers will be instructed on the techniques for fitting sleeves to a range of roller types as well as some skills to solve problems as they occur.
It is one of the most common uses for Holscot FEP and PFA sleeves to be fitted to bowed (banana) rolls. The techniques for fitting the sleeve need to be slightly adapted to account for the curved nature of the roll. Rubber covered bowed rollers are most usually covered although even some metallic bowed rollers can be covered using thicker gauge FEP sleeves to try to avoid the risk that the sleeve could be trapped in the gap between the segments
The installation procedure to fit a Holscot Heat Shrinkable Sleeve to a bowed roller can be seen here
Customers need to advise the diameter of the roller to be fitted, the face length, what the roller is made from (if rubber please advise the type of rubber and the shore hardness) and the operating conditions.
Yes. Holscot can manufacture sleeves with diameters up to 1500 mm using their unique welding techniques which produce a seam which is barely discernible. This technique enables them to make the FEP sleeves for Drying Cylinders which are fitted on site whilst the cylinder is still in the machine.
The initial concept was not air filled. This allows a much more simple structure – ideal for smaller projects such as sunrooms or greenhouses. The market place has led Holscot to incorporate an air pressurised option in some larger constructions. However, the advantage of the non pressured panels is that they arrive ready to fit requiring no special extra frame work.
The framework is normally aluminium. The ETFE is generally 0.2mm thick but can be up to 0.25mm and is welded together and shrunk over the frames. Rectangular frames are the norm but triangular, pentagonal, octagonal can all be accommodated. The result is a lightweight panel which can be fitted into wooden or metal structures with great ease.
No, it remains unaffected for an indeterminate time. ETFE allows UV through more effectively than glass.
Yes, Holscot’s welding techniques can be used to weld together large sheets of ETFE.
Holscot works closely with Access North based in Holmfirth West Yorkshire who can carry out on site installations (www.accessnorth.co.uk)
Repair tape can be provided to patch small holes. Complete replacement panels can be easily inserted in the event of more major damage.
Holscot’s standard range includes Flange Shields to fit ASA150 and PN10/16 flanges but Non Standard Flanges can also be covered. All that is needed is to advise Holscot the diameter of the flanges and the overall width, measured when the flanges are bolted together.
The standard range of Holscot Flange Shields is heat shrinkable. So, once they are clipped into position, if they are exposed to high temperature, they will shrink tightly onto the rim of the flanges. Some customers choose to assist that shrinking process using a hot air gun; others rely on the temperature generated within the pipework on which the Holscot Flange Shield is situated. If not exposed to high temperature the Holscot Flange Shield can be removed and relocated. If required, Holscot can supply a NON heat shrinkable Flange Shield if removability is important.
In theory yes, but in practice no. The cost would be more than a new pan
Yes, any colour can be accommodated with sufficient notice. The tyres need to be removed before being passed to Camerons’ for coating
The PTFE based coatings are generally quite thin around 25 – 45 microns. Decorative powder coatings are thicker – around 130- 200 microns. For the applications where chemical resistance is important, the ECTFE coatings can be applied up to a thickness of 1mm.
Fluoroplastic coatings are subjected to temperatures between 220 – 405 C depending on the application and substrate material.
The metalwork must ideally be clean and free of all corrosion and all sharp edges taken off and radiused. Corrosion should be kept to a minimum. Cameron Coatings can prepare the metalwork at additional cost.
The range of coatings used by Cameron Coatings includes food approved and medical grade coatings.
For steel pipework and fittings, FEP Shelman offer a lining in PTFE, whose resistance to chemical attack make it the most widely used of linings in Chemical, Pharmaceutical and Petrochemical environments. For chemical vessels and tanks, FEP Shelman use FEP, PFA, PP, PVDF and ETFE as lining materials. The choice of lining is dependent on the chemicals contained. It is normally recommended that a sample of the material be tested in the proposed contents by the customer prior to proceeding. Chemical accessories such as dip pipes, spargers, sight glasses and agitators are normally lined with FEP.
Possibly. But if the tank is being made from new the normal procedure is to make the tank from the inside out by forming the liner onto a fabricated mandrel with the glass backing of the liner exposed which is subsequently overwrapped with a number of layers of GRP to complete a homogeneous layer.
That depends on the lining material. PVDF and ECTFE are seldom exposed to more than 100 deg C. Whilst FEP and PFA are both capable of resisting higher temperature, the adhesive used restricts the operating temperature to 150 deg C.
Yes. FEP Shelman can supply GEKO pumps and their spares as well as spares for the original Shelman range of pumps.
Generally speaking no. There will be no guarantee as to the condition of the steelwork after removal of the lining.
It is a speciality of FEP Shelman to carry out inspections of fluoroplastic lined vessels, tanks and equipment on site at customers’ premises. In most cases, repairs can be carried out on small areas of mechanical damage. PP, PVDF, ECTFE and FEP lined tanks can all be considered.
FEP and PFA can be supplied in thicknesses from 25 microns. FEP is available in a maximum thickness of 2.4mm. PFA can be supplied in thicknesses up to 6mm.
FEP and PFA can both be supplied with a laminate of glass cloth in thicknesses from a minimum of 1.5mm. Holscot/FEP Shelman use them extensively in the lining of chemical equipment. They can also be welded together to make in effect seamless non stick belts.
Yes. In thinner gauges white and red film are not uncommon but for the thicker gauges Holscot can incorporate a pigment into the extrusion of films from 0.25mm. Yellow, blue, red and even silver have been successfully produced.
Yes. For 25 and 50 micron film, a corona discharge is used to disrupt the molecular structure of the polymer and provide a bondable surface. For thicker gauges, sodium based etching is used which gives a light brown hue to the film.
Yes. The welding techniques that Holscot use are machine based and one of the first techniques devised at their inception and allow the fabrication of ultra wide rolls of fluoroplastic film.
Yes. One of the first skills Holscot developed at their inception was to vacuum form FEP. As part of the project to develop a liner for water tanks for the International Space Station, Holscot successfully carried out the largest FEP vacuum forming ever attempted. Holscot have since carried out the same procedure with PFA.
Fragment retention lamps are essentially standard lamps which have been protected with an external FEP coating which prevents the glass from escaping in the event of breakage.
The aim of fragment retention sleeves is to provide a shatter resistant protection greater than the implosion force generated in the tube
IEC61549 (BS EN 61549) specifies that a fragment retention lamp must retain 100% of the glass from a breaking lamp when subjected to a horizontal impact from a height of 4 metres onto a concrete floor.
A successful fragment retention covering needs to pass the IEC61549 drop test at the end of the working life of the lamp. In addition the covering should also provide good thermal resistance and be non combustible.
Holscot FEP covers fulfil all these criteria.
Holscot have undertaken to have their FEP covered lamps tested by an Independent Testing House to this Standard and the results can be seen at our Downloads section click here
FEP is the material of choice as there is no deterioration during the lifespan of the lamp – even Long Life lamps. It is completely unaffected by UV light and will not age, discolour or become brittle
FEP will endure temperatures up to 204 deg C, which is higher than the standard operating temperature of fluorescent lighting. This makes it even suitable for use in enclosed IP65 fittings
On each production run, a test sample is subjected to the 4m drop test specified in IEC65149. Only after this test is performed are lights released and production continued. This sampling is carred out at regular intervals to ensure compliance to the Standard.
Aged lights are continually tested at Holscot at the end of their life to also comply with the Standard.
External Independent testing can also be carried out.