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Home    Products    Flat Sheets    SUNLITE® Family of Products    SUNLITE® SLT

SUNLITE® SLT

Selective Light Transmission Multiwall Polycarbonate Sheet

SUNLITE SLT offers all the benefits of polycarbonate glazing, such as high impact resistance, excellent durability, and 99.9% UV protection. But SUNLITE SLT also features Selective Light Transmission technology, which transmits plenty of visible light while keeping more heat out. SUNLITE SLT's benefits are also valuble for populated areas: high light diffusion provides a more comfortable environment for retail customers, or greenhouse laborers.

Main Benefits
  • Transmits valuable PAR light for plant growth while reducing the sun's heat
  • Reduces shade requirement by minimizing plant stress due to heat
  • Irrigation and growth regulator requirements are reduced, as well as related labor costs
  • Offers more and better light quality for plants than standard white or opal panel
  • Selective Light Control resins are stable and won’t fade or become ineffective over time
  • Built-in condensation control
Typical Applications
  • Greenhouses
  • Garden Centers
  • Agriicultural working environments
Why do I have to predrill fastener holes?
Predrilling the holes insures the panels will have room to expand and contract properly with temperature change. Skipping this step can lead to distorted or warped panels. Please be sure to read the installation instructions located on the specific product's document page.
How do I cut these panels?
Corrugated and Multi-wall panels may be cut with a circular saw (using a very fine-toothed blade for plastic panels, veneer, or plywood). For best results, it is often better to cut a few corrugated panels at a time to reduce vibration; clamping the panels also helps. Also, if using a standard circular saw blade, better results may be seen by running the blade backwards (turn it over to reverse direction). Panels may also be cut by hand by carefully using tin snips or a utility knife. For other cutting instructions and further details, please visit each product's document page. You can also view our general Corrugated Products Installation Overview video.
Do Palram products keep the "heat" out?
Palram products are available in a variety of colors (varies by product), each with its own heat and light transmission properties. While all Palram panels block virtually 100% of harmful UV radiation, there are variations in heat and light transmission.

Clear panels allow most solar light and heat through while lighter, opaque colors are more reflective. If excessive heat buildup is a concern, our "Solar Control" panels are you're best bet. Please see each product page for more information on color offerings, light transmission percentages and warranty terms.
How long do the panels last?
Palram manufactures a variety of different products for different applications. Most have industry-leading warranties against manufacture-related defects, as well as specific warranties related to the intended use for the product. However, with proper installation and maintenance, we expect our products to far exceed the warranty periods.

Many of our products are engineered to be installed outdoors and are warranted accordingly. Nevertheless, the lifespan of outdoor products can be affected by how well they were installed, as well as environmental factors like air pollution, winds, and erosion by sand particles.

Warranty details can be found in the Downloads tab under the Warranties section at the bottom of the page for each individual product.
Is there a paint that is appropriate for polycarbonate?
Unfortunately we can’t recommend painting our panels. While polycarbonate is a very resilient material, it is potentially sensitive to chemicals contained in many exterior paints. While we can test a paint for compatibility, we have no way of controlling whether a paint manufacturer will remain consistent with their formulas over time.
What should I use to clean my panels?
Warm water with a mild household detergent should be sufficient to clean Suntuf or Sunlite panels. Wipe off any remained dirt with a soft cloth and wash again. NEVER use a solvent based cleaner (ammonia, etc.). AVOID using sponges or brushes that can scratch the panels surface.
My building inspector says I need to know your flame spread rating. Can you provide this information?
Yes. We can provide test reports and other such documents. Please contact your Palram Dealer if you require these data, or Contact Us. This is technical data and is not to be considered a warranty.
Is it OK to screw in fasteners using a power screwdriver or screw gun?
Adjustable electric screwdriver is allowed, provided you set the torque to the minimal needed, in order to prevent over-tightening and local deformation of the panel. For that reason, pneumatic tools should be avoided.
Is it OK to walk over roofing sheets while in storage, during or after installation?
No. In case it can’t be avoided during installation. It's recommended to use a crawl board that is strong enough to support the weight of the person, and that spans at least three purlins or supporting members.
How should I store packed sheets?
Store in a protected, shaded, ventilated site, with no direct exposure to sunlight and winds. In outdoor temporary storage cover with opaque protective film, and avoid PVC films and heat-absorbing materials. Please note: Surface protective films that cover sheets are highly sensitive to heat and direct sunlight. Excessive heat and direct sunlight before taking off the film can cause that film to bond the sheet surface, after which it will not be practically possible to remove it from the sheet!
Why are there polyethylene films on certain sheets and should I peel it off?
The surface films in certain sheets, like Sunlite and Palsun sheets, are needed for protection against dirt and scratching, and also used to carry important information to the installer and final customer. The indication of the UV protected side that should be installed facing outwards is extremely important.It is recommended to peel off the protective films only after installation. In case this will not be feasible and the film will be peeled off before laying the sheets, it must be remembered to at least mark the UV protected surface, so that the sheet will not be installed inside out.

Note: wrong installation damages are not covered by Palram.Please also note: Surface protective films that cover sheets are highly sensitive to heat and direct sunlight. Excessive heat and direct sunlight before taking off the film can cause gluing of that film to the sheet surface, after which it will not be practically possible to remove it from the sheet!
Can the sheets be curved?
Yes. Sheets can be cold-curved and serve in arched shapes, provided the relevant Palram specifications for minimum radius in cold curving are followed. These specifications can be found in the Installation Instructions of the relevant sheets.

Solid sheets can be cold-curved in any direction.

Corrugated sheets can be arched so that the corrugations themselves are curved (lengthwise).

Multi-wall sheets can be arched so that the actual ribs will be curved (lengthwise).

Curving is not recommended across the ribs direction.
Do plastic roofing sheets really block UV radiation?
Some of them do. Rigid PVC and polycarbonate sheets are practically opaque to UV radiation, making them a perfect barrier against this harmful radiation. They actually block UV-A and UV-B radiation better than nearly any sunscreen lotion.

On the other hand, acrylic roofing sheets generally transmit a considerable portion of the UV radiation.
If polycarbonate sheets block UV radiation, why is there a ‘UV side’ to face outwards?
Polycarbonate (PC) inherently blocks UV radiation by absorbing it and not allowing it to pass through the panel. However, the absorption of UV also degrades polycarbonate, therefore, the sheet(s) has to be protected against UV radiation. Most Palram PC products feature a very thin co-extruded layer of UV-resistant PC resins that protect the entire sheet from UV radiation. In most cases, UV protection is applied to one side, however, two-sided UV protection is available for select products. 

In order to ensure the protection of single-sides UV protected sheets, they must be installed with the marked UV protective layer facing out toward the sun. Although sheet products can also be UV protected on both sides, most of the sheets are protected on one side that is marked clearly.
For Sunlite and ThermaGlas multiwall panels, can I leave on the masking tapes that block both ends?
No. These tapes are good for packaging/storage only, and are not strong enough for field service.

After installing sunlite sheets, seal top end with aluminum foil ‘Solid tape’, and bottom end with special ventilating ‘Breather tape’.
Should I paint the structural rafters with any paint?
Yes, you can paint structural rafters or supports, but be sure to paint only with light or white color. Do not use dark colors like black or brown, that can absorb and reflect intensive heat.
What's the difference between ThermaGlas® and Sunlite®?
ThermaGlas™ branded products are engineered specifically for commercial greenhouse applications. Panel widths, thicknesses, pigments, and special greenhouse-specific features such as guaranteed condensate control are consistent with commercial growers' needs. Aside greenhouse-specific features, ThermaGlas is the same as Sunlite (for equal thicknesses, weights, and panel widths). Outside of North America, Palram uses the Sunlite Plus brand as opposed to ThermaGlas.
Can I recycle my old polycarbonate or PVC panels?
Palram's Polycarbonate and PVC sheet products are recyclable. Many cities and towns have recycling programs that include curbside pick-up. If so, Polycarbonate products such as SUNTUF, SUNLITE, PALSUN, DYNAGLAS, or THERMAGLAS should be marked "Plastic #7" prior to recycling. PVC products such as PALRUF, AG-TUF, PALOPAQUE, PALCLEAR, or PALIGHT, should be marked "Plastic #3".

If local recycling is not available, other resources are available:
For PVC products, visit the Vinyl Institute's Recycling Provider Database:
http://www.vinylinfo.org/Recycling/VinylRecyclingDirectory.aspx
For polycarbonate products, visit The Association of Post Consumer Plastic Recyclers site and download their materials buyers and seller's list:
http://www.plasticsrecycling.org?
How can I determine if a sealant is compatible with Palram's polycarbonate products?
Palram tests various sealants for compatibility with its polycarbonate product. We attempt to purchase sealants that are widely available at home improvement stores and lumber yards. Click here to learn more about sealant compatibility and to download a list of product that have been tested.