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Non Glare Hard Coated Polycarbonate Sheet and Machined Displays

 Polycarbonate sheet is an excellent plastic for display filters. The polycarbonate provides high impact resistance combined with an excellent flammability rating. In terms of clarity polycarbonate is comparable to glass, but being a much lighter substrate polycarbonate is more suitable for applications where weight is an important consideration. Polycarbonate is a soft material, from which is easy to machine complex shapes.

Plastic Machining Image result for non glare polycarbonate screen images Image result for non glare polycarbonate screen images

Visiontek System's polycarbonate sheets are available in a range of thickness and surface finishes. Our CNC cutting facility will machine steps, holes with threads and grooves to strict tolerances. 

Standard Sheet Size (mm)  1250 x 2050
Standard Sheet Thickness (mm) 0.5, 0.64, 1.0, 1.5, 2.0, 3.0, 4.0

Colours

Coloured polycarbonate sheets can provide effective contrast enhancement for coloured displays. Typical applications are LED, Vacuum Fluorescent and Electro-luminescent displays, where the filter accentuates the colour of the emitted light, making the back of the display appear darker.
Specific colours can be matched. There is a minimum order requirement of 5 sheets.


Lead Time
Sheet Ex-stock
Machined parts 7-14 days

Surface Finishes

UV cured clear hard coating

Polycarbonate is a soft plastic material. Visiontek Systems coat most of their polycarbonate sheets with a clear hard coat to eliminate the risk of scratches occurring through general handling of the product. This coating also provides a high level of chemical resistance. 

75 gloss UV cured clear non-glare hard coating 

This coating provides the benefits of a non-scratch coating combined with a dispersive non-glare finish to reduce reflections in conditions where bright sunlight or overhead lighting may reduce the readability of a display. They are a cost-effective solution where signal image quality is not critical and the distance from the display to the non-glare surface is less than 5mm.

Using a non-glare etch on the front screen of a CRT display can cause an interference with the light etching on the tubes. This will result in a coloured sparkling effect. To overcome this distortion the screen should be positioned at least 10cm from the display.

Coating Specifications - the non-glare and clear hard coatings meet the following requirements:

Abrasion resistance Pencil hardness test - 3H
Coating Adhesion No signs of de-lamination of coating with the cross hatch test. 
Haze and Luminous Transmittance BS4410 - haze value of 4%
Water resistance Passes the cross hatch test with no discoloration after 7 days in water at 40C.

   

These coatings have been formulated to protect plastic substrates from chemical attack for industrial, commercial and military uses. They provide outstanding resistance to all organic solvents and cleaning agents that are in common use.
The table below shows the resistance to attack from various chemicals and qualifies the resistance by reference to short (S), medium (M) and long (L) term stability.

If a chemical you are using is not on this list, please contact Visiontek Systems for a sample for testing.

Solvent or Reagent Coated Polycarbonate
Ethanol  L
Propanol L
Acetone S
MEK  S
Petrol L
Dilute Ammonia M
Dilute Caustic Soda S
Concentrated Caustic Soda S
Dilute Organic Acid L
Dilute Inorganic Acid L

 

S - Short term resistance - drops / spills
M - Medium Term resistance - up to 8 hours
L - Long term resistance - no attack

Military Requirements

These coatings have been tested in chemical hardness tests for military applications. The coating prevents damage from all agents and decontaminants used:

Chemical agents simulated were:
Persistent nerve (VX)
Sulphur Mustard (H)

Properties

General Properties

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Light transmission 92

Thermal Properties

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Thermal conductivity 0.21 W/K.m DIN52612
Linear thermal expansion 65 x 10-6 k-1
Heat Stability 120C

Mechanical Properties

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Tensile strength 60 N/mm (DIN53455)
Elongation at break >100%  (DIN53455)
Modulus of elasticity 2300 N/mm (DIN53457)
Unnotched impact strength no break (DIN53453)
Notched impact strength >30 kJ/m (DIN53453)

Electrical Properties

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Dielectric strength >30 kV/mm (DIN53481)
Volume resistivity >1016 ohm.cm (DIN53482)
Dielectric constant  3 (DIN53483)
Dissipation factor  0.001 (DIN53483)

Handling

All filters are packaged with a protective foil on both sides or wrapped in tissue. We recommend that the filters are stored like this.
For all filters, try to limit the number of occasions the filter is handled as this can easily damage it. A few important hints are listed hereunder:

  1. Handle filters by holding at the edges
  2. Do not remove the protective foil until final installation of the filter. Inspect the filter by holding it at the edges and peeling back the foil halfway. Replace the foil and then repeat for the other half of the filter.
  3. Inspection should be carried out in a clean, dust-free environment. Always use lint free wipes or dry compressed air.
  4. Always ensure that the filter is placed on a clean, dust-free surface.

Cleaning

Uncoated polycarbonate is extremely soft and should not be cleaned by rubbing or dusting with a cloth. Surface dust can be removed using clean, dry compressed air.
Non-glare and hard coated polycarbonate can be cleaned with a dry cloth. Do not use alcohol based solutions. These will cause the polycarbonate to go cloudy and over time this will cause stress ageing which makes the polycarbonate brittle.

 

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