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Endless design possibilities with many superior advantages:

• Excellent thermal insulation

• Highly flexible

• Virtually unbreakable

• Lightweight and easy to install

• Extra strength under extreme wind and snow loads.

• Recommended Uses: Windows, roofing, vertical walls, D.I.Y.





Roofing & Window Protection
Polycarbonate Twinwall by Polygal

Endless design possibilities with superior performance.



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Polygal Polycarbonate Twinwall Overview

Please Call us at 1.888.768.5759 to speak directly with a sales agent.


In good architectural planning elements of the environment in which the structure will be placed must be taken into account. In outstanding architectural planning, the environment becomes an integral part of the structure.


Polygal sheeting harnesses nature to create the interior atmosphere by enlisting nature’s qualities for the creative process. Realizing that the creative process in building depends on the ability to adapt the materials for the design concept, Polygal offers architects a raw material that is like putty in their hands – almost any idea, however crazy it may be, can be implemented.


The unique advantage of Polygal sheeting allows the architect to create a sense of openness and flow while maintaining stability and strength for years to come.


These sheets come in clear, ice white, bronze, special colors by request, and in various thicknesses. They are flexible with different levels of transparency, provide insulation, withstand harsh weather conditions and are easily installed.

Polygal sheeting provides solutions in a number of areas such as transportation projects, public and commercial buildings, open passageways, pools, verandahs, interior design elements, display windows, display areas, exhibitions, signs, etc.


Available Documents


Manufacturer Spec Sheet

Interstate Plastics Spec Sheet


Polygal Applications

Polygal Polycarbonate is a tough, dimensionally stable, transparent thermoplastic that has many applications which demand high performance properties. This versatile thermoplastic maintains its properties over a wide range of temperatures, from -40"F to 280"F. It has the highest impact resistance of any Thermoplastic. Polygal is transparent up to 2" in special grades, has outstanding dimensional and thermal stability, exceptional machinability, and is stain resistant, non-toxic with low water absorption.

Polycarbonate is less susceptible to breakage than glass. Numerous tests have been proved that the material is almost unbreakable. Test scenarios were carried out using rocks and wooden posts as projectiles in an attempt to break the polycarbonate panels, with no success.

Polycarbonate not only weighs less than glass but it also has a special UV coating that helps to protect from sunlight and extreme temperatures.



  • Impact Resistance
  • Lightweight
  • High Light Transmission
  • Energy Efficiency
  • Weather Resistance
  • Flame Retardant



  • Less Support Structure Required To Install Sheets
  • Job Site Formable – Unlike Glass
  • Easy To Install





Polygal Specs

Tensile Strengh: 9500 PSI

Flexural Strength: 13500 PSI

Compressive Strength: 2500 PSI
(10% Deflection)

Impact Strength, Notched Izod: 14.0 Ft-lb/in.

Tensile Modulus of Elasticity: 340,000 PSI

Flexural Modulus of Elasticity: 3.2 PSI

Hardness (Rockwell): M70

Deflection Temperature @ 264 PSI: 270 F

Specific Gravity: 1.2

Dielectric Strength: 380 Volts/Mil

Hardness (Rockwell): M70

Scott Daniels, Monecito, CA

Polygal is unbreakable! We've had plenty of incidences where glass would have broken, but our Polygal panels keep our greenhouse safe and easily maintainable.

John Ahner, Longview, WA

Thanks to the Interstate Plastics folks for helping me learn more about Polygal and using it to protect my skylights. Peice of mind during the windy season.

Robert William, Madison, WI

Not as visually appealing as the glass I was using, but I was tired of breakage, and so far so good with the new Polygal.

Marta Eklund, Nampa, ID

My plants respond better to the Polygal Polycarbonate than traditional glass. The light is dispersed, so all plants get even sunlight.

Linda Laoma, Cranston, RI

One of the sheets came damaged, and it took over 3 weeks to replace. The salesman did his best to correct the issue, but I was one sheet short for my schedulled and urgent project.

Tommy Svensson, Lincoln, NE

After the glass on the side of my greenhouse broke for the third time, I was desperate for a better solution. Interstate Plastic helped me pick the right Polygal kit, and not only do I have no more broken windows, but my greenhouse is visually stunning!