Polycarbonate Panel 4mm Clear

Polycarbonate Panel 4mm Clear


$194.00 Regular price

  • In stock - departs in 1-2 business days
  • Inventory on the way

ThermaGlas 4mm twinwall clear polycarbonate, in 2' x 6' panels, are perfect for use as replacement panels for hobby greenhouses.

These ThermaGlas polycarbonate panels offer 99.5% UV protection. The light weight and shatterproof multiwall design coupled with integrated UV resistant co-extruded layer yields long service periods backed up by a 10 year limited warranty. The cellular multi-layer structure reduces heating costs in winter while minimizing excessive heat in summer. A special coating on the bottom side eliminates condensation dripping. Blocks ultraviolet rays that burn plants and living tissues, and transmits only beneficial radiation.

  • 2' x 6' panel
  • 4mm Thickness for double wall
  • 82% light transmission
  • Superb thermal insulation—saves energy
  • 10 year limited warranty against UV degradation
  • Impact resistance—virtually unbreakable
  • Approx. Weight: .16 lbs per sq. ft.
  • Low flammability (available with CC1 rating)
  • R-Factor: 1.49; U-Factor: 0.67


Volume pricing available for large quantity orders. Email Us or call a representative at 1-888-281-9337 to place quantity orders. Purchase orders are accepted from schools and institutions.

Additional Information

ThermaGlas Assembly & Storage Guide (PDF)

Multi-wall Polycarbonate Installation Instructions (PDF)

ThermaGlas Technical and Installation Guide (PDF)

ThermaGlas Limited Warranty (PDF)

Free Shipping

This item ships free - almost anywhere in the Continental United States!

On rare occasions addresses with limited access such as islands or major metropolitan areas (ie: New York City) may incur additional delivery fees; if so, you will be contacted to confirm the extra shipping cost before your order is processed. Shipments to Alaska or Hawaii qualify for free shipping to any West Coast port. Please contact us for special shipping rates from the West Coast to Alaska or Hawaii.

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Customer Reviews

Based on 3 reviews
Greg Hidley (Los Angeles, US)
polycarb panels to rejuvinate harbor freight greenhouse

After trimming to size, the new panels worked perfectly.

K Herbert (The Plains, US)
Poly panels

I have a small green house and after a big windstorm, one panel blew out and cracked. Replaced it with these panels and it worked great. I had to trim to size for fit, but it works and looks great. Thanks!

Legacy Review
Exactly what I needed

I bought a cheap Chinese greenhouse kit. When I assembled it, I found some of the panels to be narrower than specified. When a wind came up, several panels blew out. 4-mm replacement panels of sufficient length were hard to find, but Greenhouse Megastore had them. They are the correct width and they fit as they should. If I need more replacement panels in the future, I will check Greenhouse Megastore first.