Multiwall and Twinwall polycarbonate sheeting for light transmission and thermal insulation

SUNLITE® UV-protected multiwall and twin wall polycarbonate panels maximize daylighting and thermal insulation in business and industrial buildings. Applications include daylight systems, industrial and commercial roofs, curtain walls and facades, commercial canopies and covered walkways, external cladding, interior partitions, illuminated signage, and merchandising displays.

Palram’s SUNLITE® range of multiwall polycarbonate products includes SUNLITE® Industrial sheets, SUNLITE® Plus with built-in condensation control for swimming pool covers and greenhouse glazing, and SUNLITE® DIY for residential multiwall roofing.



Hail & impact


Protects against
UV radiation

Balance shade
& daylight

10 years

VTB Arena, Moscow


  • Commercial Greenhouses

  • Swimming Pool Roofing

  • Patio Roof Cover

  •  Polycarbonate Covered Pergola

  • Polycarbonate Pool Covers

  • Year-Round Weather Protection

  • Multiwall Greenhouse Glazing

  • Outdoor Living Spaces

Colour Swatch

Choose from a variety of clear or coloured polycarbonate sheets.
  • Clear

    80% LT | 80% HT

  • Grey

    20% LT | 42% HT

  • White Opal

    30% LT | 47% HT

  • Bronze

    35% LT | 64% HT

  • Solar Control Grey

    25% LT | 41% HT

  • Solar Ice

    20% LT | 40% HT

Product Details

  • Dimensions
  • Colours & Finishes
  • Physical Properties
  • Technical Data


StructureThickness (mm)Area Weight (Kg/m²)U-Value (W/m²•°K)Width 964 (mm)Width 980 (mm)
Twin Wall101.72.9
7 Wall101.92.3

Note: Other widths & thicknesses are available upon request. Please contact your Palram Distributor for more details.

Product Range

Sunlite® UV2UV protection on both sides
Sunlite® Solar SmartSolar metallic reflective heat blocking sheet
Colours & Finishes

Standard Colour chart

Twin wall 10mm80%35%30%20%
Triple wall 10mm76%



Solar Smart Colours

Solar Colour TextLight Transmission Values Adhere To ASTM D-1003.
StructureSolar IceSolar Control Grey
Twin wall 10mm20%25%
Physical Properties

Typical Physical Properties

Heat deflection temperature (HDT)D-648Load: 1.82 MP°C
Service Temperature - Short term°C
-50 to +120
Service Temperature - Long term°C-50 to +100
Coefficient of linear thermal expansionD-696mm/mm °C6.5x10-⁵
Tensile strength at yieldD-63810 mm/minMPa62
Elongation at breakD-63810 mm/min%>90
Impact falling dartISO 6603/1J40-400
Practical thermal expansion/contractionmm/m3

Typical Physical Properties Notes     Physical Properties Data Adheres To ASTM Except Where Noted Otherwise

Technical Data

Flammability Properties

Physical properties data adheres to ASTM except where noted otherwise

BS 476/7Class 1
EN 13501B, s1, d0
ASTM E-84Class A

Flammability Notes      * Depends On Sheet Structure. For More Information Please Contact Your Palram Distributor.

Regulatory Code Compliance Certification

ICC (International Code Council)IBC-2012 (Light Transmitting Plastic)ESR-1893


  • How to Calculate a Roof Slope to Enable Proper Drainage

    Watch video>
  • Retrofitting Australia’s Olympic stadium with SUNLITE® 16mm

    Watch video>
  • How to Balance Between Light Transmission & Thermal Properties

    Watch video>
Project Materials Calculator

Estimate the materials required for a basic patio structure using our corrugated products. Simply fill in a few fields with the appropriate dimensions – we’ll calculate the results.

Calculate now


Palram’s SUNLITE® multiwall polycarbonate sheet product range is available in a wide range of colours, thicknesses, and structures.  This range gives you the ability to match the specifications of your application, with the right balance of light transmission, thermal properties, weight, load-bearing, impact resistance, and aesthetics. All SUNLITE® products are suitable both for indoor and outdoor applications.

SUNLITE®  polycarbonate triple wall sheets provide improved thermal insulation, with a more robust structure that performs better under heavier loads.

SUNLITE®  X-lite multiwall polycarbonate sheets, offer unmatched weight-to-strength ratio, along with improved thermal insulation properties. This is SUNLITE’s strongest and thickest version available. This robust multiwall sheet can carry loads better than any other multiwall polycarbonate alternative.

SUNLITE®  7-wall polycarbonate sheets enhance the thermal insulation properties of SUNLITE while retaining low weight and high impact strength. We offer a clear 10mm 7-wall polycarbonate sheet. Requests for thicknesses up to 25mm based on minimum quantities.

SUNLITE®  Plus multiwall polycarbonate greenhouse panels are manufactured with built-in condensation control. It is an excellent choice for greenhouse covers and internal partitions, preserving energy, and reducing condensation accumulation.

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Show FAQs
How do I curve the polycarbonate to follow the façade curve?

All Palram polycarbonate products can be cold bent onsite during installation, subject to a minimum radius. The radius varies based on the chosen product. For flat sheets such as PALSUN & SUNLITE, the rule-of-thumb for the minimum radius is the thickness multiplied by 200. Please check the Palram catalog for more detailed specifications.

How do I specify the required thickness of the polycarbonate glazing material?

The recommended thickness of the polycarbonate glazing material is based on factors such as wind & snow load, panel size, and boundary conditions. Visit the Palram website for access to calculators that can help you determine the recommended thickness.

How do I reduce the heat build-up coming from the façade into the building?

In order to reduce heat build-up through the façade, Palram strongly recommends the use of its tinted SolarSmart™ panels. SolarSmart™ tints can be implemented in all Palram polycarbonate products. For more information, reference the Palram SolarSmart™ technology page.

What is the minimum allowed bending radius of polycarbonate?

The minimum allowed bending radius of the polycarbonate is 200 times the thickness of the sheet, for example, a 2 mm sheet has a minimum 400 mm bending radius.

If polycarbonate sheets block UV radiation, why is there a “UV-side” that faces outwards?

Polycarbonate sheets block UV radiation by absorbing it. This absorption mechanism can cause degradation to the material, and to prevent this from happening, the sheet is coated with a special material.

For this reason, it is recommended that the sheets are installed with the marked UV protective layer facing outward. Moreover, most of the sheets are only protected on the side that is clearly marked as such.

Why do I have to pre-drill fastener holes in roofing with corrugated panels?

Pre-drilling the holes ensures that the panels have room to expand and contract properly with temperature changes. Skipping this step can lead to distorted, warped or cracked panels.

Will polycarbonate light transmittance deteriorate over time?

PALRAM’s polycarbonate products are shielded with a UV protection layer that guards against photodegradation, yellowing, and brittleness. This protects the sheets from the harmful impact of UV radiation and helps to maintain light transmittance and quality for many years. Our products come with a 10-year warranty against loss of light transmittance. Upon special request, we can provide an enforced UV protection layer with a longer warranty.

How do I determine the color, Light Transmission (LT) and haze properties of polycarbonate?

This decision depends on the application – some of the colors are transparent and some are translucent. If a see-through material is needed, then haze should be smaller than 1% and the LT% should be based on the illumination design. If a translucent effect is needed, then the haze should be 100% and the LT% based on the chosen color.

What is the difference between multiwall and solid polycarbonate?

Multiwall is a multi-cell structured sheet. Due to its multi-cell structure, it has superior thermal insulation and low area weight.

Can I install multiwall polycarbonate sheets horizontally for siding?

No. The multiwall channels should always be vertical to allow condensation water to drain out by gravity.

How do I clean the polycarbonate?
  • Never use abrasive or high alkaline cleaners on any Palram polycarbonate products.
  • Do not leave cleaners on Palram polycarbonate for extended periods of time. Rinse immediately with cold, clean water.
  • Do not apply cleaners in direct sunlight.
  • Never use sharp objects, squeegees or razors on polycarbonate.
  • Do not clean with gasoline.
  • Always practice safety first and never step directly on a polycarbonate panel.
  • Always test cleaners in a small inconspicuous area prior to cleaning the entire panel to ensure against adverse results.
  • Avoid allowing the pressure washer spray tip to come too close to the panel. Pressure washers often have enough pressure at the spray tip to penetrate or tear the panel.
  • Avoid dry cleaning as sand and dust particles clinging to the exterior of the panels may scratch the surface.