4mm Polycarbonate Sheets

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4mm twinwall polycarbonate sheets are ideal for replacement greenhouse glazing panels. Also great for cloches and cold frames. 4mm polycarbonate is a lightweight and safe to handle alternative to glass. High impact resistant and excellent value for money.

We cut it to size for you completely free of charge.  

Colour: Clear

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4mm Polycarbonate Sheets

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Excl. VAT: £0.00 Incl. VAT: £0.00


4mm Twinwall Polycarbonate Sheets

Mainly used for Greenhouse glazing. The sheets are manufactured from damage-resistant polycarbonate. They also have co-extruded long life protection from the effects of UV rays. Polycarbonate has very high impact resistance and fine optical clarity. The high performance UV absorption layer means longer life. This is shown in prevention of yellowing and loss of strength. Polycarbonate offers excellent protection against vandalism and accidental damage. It has an impact resistance up to 200 times greater than glass. This is maintained over a broad temperature range and long service life.

Main Benefits

  • High levels of natural light
  • Light weight and easy to handle
  • High optical clarity
  • Thermally insulating
  • Damage and impact resistance
  • Weatherable Longlife UV protection
  • 10 year warranty
  • Perfect for replacing greenhouse sheets


  • Greenhouses
  • Vertical, Secondary and Internal Glazing



  • Tints: Clear


Thickness Chart

4mm Polycarbonate Sheet Thickness

U-Value 3.8
Light Transmission 62%
Weight (kg per sqm) 0.8
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