Slater Plastics Ltd

  • Unit 7 Hanborough Business Park
  • Lodge Road, Long Hanborough
  • Witney
  • Oxfordshire
  • United Kingdom
  • OX29 8LH (map)

  • Tel: 01993 881486
  • Fax: 01993 883070
  • Website: www.slaterplastics.com

Contacts

  • Geoff Eccleshall, Director
  •  
  • Number of Employees: 1 - 20

Optical filtering, RFI shielded windows and fascia panels


Slater Plastics are experienced manufacturers & designers of high quality optical filters, contrast enhancing filters, RFI windows, EMC windows & screen printed fascia panels. We manufacture our filters from ally l carbonate, acrylic, polycarbonate or glass.

Our ADC filters (equivalent to CR39), have excellent light transmission, abrasion resistance, resistance to hot metal sparks, operational temperatures over 100° C, excellent resistance to acids, alkalis & solvents.

Our shielded windows are manufactured using micro-fine mesh & are cast as a single part, offering superb screening performance combined with the outstanding characteristics of ADC. Fully laminated versions are available when alternative materials are required. Shielded windows can be supplied with bezels & gaskets if required.

All our filters are 100% visually inspected.

Design and Consultation


Design and Consultation

Design and consultation services: Slater Plastics offer an optical display filter design and consultation service, to help you to design filters for your display requirements. Displays are used in all applications from public information, through to man machine interfaces. This means that the physical properties of a filter will vary to suit it´s performance needs.

Consideration will often need to be given to several characteristics, including, impact resistance, solvent and abrasion resistance, reflection control, fire specifications, U.V. resistance or protection, RFI shielding, ESD, anti - static and anti - mist.

Filters can be designed to incorporate several characteristics in one part, and material selected from allyl carbonate or CR39 TM, acrylic, polycarbonate, polyester and glass.

If a filter is designed correctly it can reduce cost, improve the readability of the display and allow your product to look at it´s best for a long time.

A display filter is the part of your equipment which is looked at for the majority of it´s life. If badly designed it can have a detrimental effect on the performance and sales of your product.

For all our customers who buy finished filters from us, the design time is free of charge. We are happy to help with the design of filters even if we are not going to be the manufacturer, but a consultation fee will be discussed prior to any work commencing.

Optical Filters and Fascia Panels


Optical Filters and Fascia Panels

Slater Plastics are manufacturers of optical filters, contrast enhancement filters, RFI / EMC shielded windows, instrumentation and display fascia panels, we also offer a design and consultation service

Optical filters and fascia panels:

Optical filters and fascia panels: Slater Plastics are manufacturers of high quality optical filters and fascia panels. These products are manufactured to suit individual customer requirements or specifications and can be made from allyl carbonate or CR39 TM, acrylic, polycarbonate and glass.

All filters can be manufactured to include screen printing and RFI shielding, ( see technical information RFI / EMC Filter windows if necessary ).

Filters can be manufactured to include many characteristics including ; contrast enhancement, reflection control, impact strength, fire specifications, abrasion and solvent resistance, polarisation and combinations of properties.

Allyl carbonate or CR39 tm filter windows  

This product is cast in house from ADC monomer and has a series of properties which makes it ideal for the production of filter windows and fascia panels. Properties include :

  • Less than half the weight of glass
  • Bright surfaces and light transmissions close to optical glass
  • Refractive index close to that of crown glass
  • High impact strength
  • Remarkable abrasion resistance ( approximately 20 times that of acrylic )
  • Resistance to pitting from hot metal sparks, 30 - 40 times higher than glass and other plastics
  • Excellent resistance to acids, alkalis and to all solvents including aliphatic and aromatic hydrocarbons
  • Easy surface dying
  • Better scratch resistance than hard coated plastics
  • Resistance to distortion by temperatures up to 130° C, a temperature at which acrylic resins are melted
  • U.V. absorbers can be added to help protect LCD displays in strong sunlight

Allyl Carbonate or CR39TM Filter Windows


Allyl Carbonate or CR39TM Filter Windows

This product is cast in house from ADC monomer and has a series of properties which makes it ideal for the production of filter windows and fascia panels. Properties include :

  • Less than half the weight of glass
  • Bright surfaces and light transmissions close to optical glass
  • Refractive index close to that of crown glass
  • High impact strength
  • Remarkable abrasion resistance ( approximately 20 times that of acrylic )
  • Resistance to pitting from hot metal sparks, 30 - 40 times higher than glass and other plastics
  • Excellent resistance to acids, alkalis and to all solvents including aliphatic and aromatic hydrocarbons
  • Easy surface dying
  • Better scratch resistance than hard coated plastics
  • Resistance to distortion by temperatures up to 130° C, a temperature at which acrylic resins are melted
  • U.V. absorbers can be added to help protect LCD displays in strong sunlight

Acrylic Filters


Acrylic Filters

Acrylic filters are often used for larger displays and also where contrast enhancement is required ( due to the large range of tints available ). For these filters we use a high grade cast acrylic which can be obtained down to 0.5 mm thick.

The large range of tints available allows specific wavelengths to be transmitted. This can be used to contrast enhance, colour correct or produce band pass filters. Infra - red filters are also manufactured to block visible light and transmit IR at around 90%.

All acrylic filters can be finished with a hard coat, for abrasion and solvent resistance, which can be applied as a gloss or matt surface.

Polycarbonate Filters


Polycarbonate Filters

Polycarbonate is usually used when impact strength or fire retardance is required. These filters are made from proprietary sheet material and normally coated with a hard coat to give abrasion and solvent resistance.

There are only a few standard tints available for polycarbonate, but others can be produced when necessary, in relatively small volumes. We have several techniques available to enable the production of polycarbonate contrast enhancement filters.

Properties of the polycarbonate will depend on the selected grade

Glass Filters


Glass Filters

Glass filters can be produced plane, matt etched or with multi layer AR coating. These filters can also be toughened when required. Laminations can be built to include all filtering characteristics already mentioned.

Available Coatings For Acrylic and Polycarbonate


Available Coatings For Acrylic and Polycarbonate

A range of optical coatings are available for the surfaces of acrylic and polycarbonate filters. Coatings can offer a selection of the following characteristics;

  • Abrasion resistance
  • Solvent resistance
  • Anti - glare ( matt coating )
  • Anti - mist
  • Anti - Newton ring
  • Multi - layer anti - reflective ( limited to a small range of product )

RFI / EMC Filter Windows


RFI / EMC Filter Windows

Shielded filter windows are designed for use with electronic displays and give a high level of shielding from both internally and externally generated electromagnetic emissions. These windows can be designed to incorporate any of the filter characteristics described in the Optical Filters and Fascia Panels data page.

RFI / EMC shielded windows can be manufactured in allyl carbonate or CR39TM, acrylic, polycarbonate or glass. The shielding element is either a cast in micro - fine mesh (allyl carbonate or CR39TM only ), laminated micro - fine mesh or ITO deposition.

Cast Allyl Carbonate or CR39TM Embedded Mesh Windows


Cast Allyl Carbonate or CR39TM Embedded Mesh Windows

These shielded windows offer the superb screening performance of micro - fine mesh, combined with the outstanding characteristics of allyl carbonate or CR39TM
( see Optical Filters and Fascia Panels for details on allyl carbonate or CR39TM ).
The general properties of cast windows are:

  • Micro - fine mesh is cast in to a one piece sheet, therefore no delamination problems and higher temperature specification than laminated parts.
  • They can be machined to any desired profile, with or without rebates.
  • Extremely good abrasion, solvent, impact and heat resistance.
  • Light weight.
  • Different meshes available to suit the application and mesh is blackened to reduce reflections.
  • None reflective surfaces can be cast in.
  • Mesh can be set at any desired angle.
  • Silver loaded bus - bar termination.

Laminated Mesh Windows


Laminated Mesh Windows

These shielded windows again offer the superb screening performance of micro - fine mesh, which in this version can be left flying for direct termination to the equipment screen. Material and characteristics for the filter can be selected from the full range, ( see Optical Filters and Fascia Panels for details of the filter range ).

The general properties of laminated windows are:

  • Micro - fine mesh is laminated in between your selected filter medium.
  • Plastic versions can be machined to any desired profile, and glass versions can be constructed with or without rebates.
  • Different meshes available to suit the application and mesh is blackened to reduce reflections.
  • None reflective surfaces can be included.
  • Mesh can be set at any desired angle.
  • Various termination methods are available including ; tape edge, mesh over gasket, flying mesh, silver bus - bar.

ITO Deposition Windows


ITO Deposition Windows

Indium Tin Oxide ( ITO ), is a transparent semiconductor which can be coated onto optical filter materials. ITO benefits over metal depositions because it is more transparent and less reflective, for a given impedance level. A good ITO coating will have optical transmission levels of greater than 75 %.

The ITO coating can be sputtered onto glass or plastic and has good chemical and mechanical durability, it will also not oxidise when exposed to air.

The oxygen content of the coating is adjusted to a compromise point, giving good optical transparency and low impedance, normally between 10 - 40 Ohms / square for shielding.

The shielding effect of thin film coatings is due to reflection of the electromagnetic wave. This means that the coatings are only effective when the wave impedance is greater than the coating impedance. This in turn means that the coatings have no effect in the magnetic, or H - Field, and are not suitable for all applications. There can also be some optical limitations to ITO coated windows and these should be fully discussed before selection is made.

Performance of an ITO window will depend on its impedance and the field impedance, but generally will produce between 80 and 120 dB attenuation in the E - Field, and around 20 dB for Plane waves.

Support resources

Call Applegate +44 (0)345 600 7177