The truth of UV-protected Polycarbonate- How to Verify it?

Solid polycarbonate has good anti-ultraviolet ability, that is because there is a layer of ultraviolet protection layer on the plate, the next step is to test this protective layer to determine whether it meets the standard, which is also a high-quality polycarbonate product basic requirements.

When making the polycarbonate sheets , because the special extruded high-grade polycarbonate raw material is used, it has a certain anti-aging performance, so the produced polycarbonate sheets is naturally outstanding in this aspect. Secondly, while the polycarbonate sheets is extruded by the main equipment, the UV protective layer is also co-extruded online, which is closely combined with the solid board base.

Does polycarbonate really block UV rays?

Of course, yes.  UNQ polycarbonate uses the co-extruded technology to produce the panels. The UV-protection material is added to the raw material so polycarbonate sheets really block 99% of UV rays. UV-protected polycarbonate won’t become brittle and yellowing over years. It can be widely used for outdoor canopies roofs, industrial daylight, curtain wall, greenhouse cover, and signage.

Why is UV-layer of polycarbonate is so important?

UV protection is very important for polycarbonate roof sheets. The reason is polycarbonate are often used for roof much exposed to sunlight. As we know, the UV rays can heavily damage the plastic sheets which will much reduce the lifespan of polycarbonate sheets. The polycarbonate sheets will easily become brittle and yellowing.

So many polycarbonate manufacturers started reaching the method of how to resist the UV rays. They finally find a protection system based on an acrylic lacquer layer enriched with UV absorbers. This lacquer provides full protection from UV rays and prolongs the life of polycarbonate sheets. The method is co-extruded technology so that polycarbonate has better performance in bad weather conditions. Polycarbonate sheets become more popular for their UV protection, high transmission, high impact resistance, lightweight, and ease of installation.

Teach you how to verify the UV-layer of polycarbonate?

People don’t know how to distinguish whether the manufacturer adds the UV-resistance material in the prosses of production when they first learn about the polycarbonate roof sheets. Sample tips help you to judge if there UV layer on the surface of polycarbonate sheets!

Judge the clear polycarbonate sheet

When we put the clear polycarbonate sheet under the sunlight above our view, the UV-protected clear polycarbonate sheets present lavender or light blue. That illustrates the clear polycarbonate panels are really blocking UV rays. The reson is UV layer usually contains a low level of optical brightener and bluish dye to restrict the yellowish effect of the UV absorber.

Judge the tinted polycarbonate sheet

It is a little difficult to judge the tinted polycarbonate sheet by eye because the UV-protected material is blue. So it is better to use professional tools to test the UV layer. It will become clear whether it is UV -protected and how much UV rays resists.

What is the method of adding a UV-protected?

Mixed addition method

A certain proportion of UV material (about 5%) is mixed into the PC material, and then melted and extruded at high temperature. However, most of the sheets processed by this method are still exposed to sunlight, so the aging of the sheet surface is still inevitable.

Coating Method

Apply a layer of UV material on the surface of the sheet. However, due to the poor compatibility of PC and other materials, rainwater can easily wash off the coating on the surface of the board after installation. In addition, considering that the board may be damaged during storage and transportation, both sides of the board are covered with protective films during production. This protective film must be torn off after installation, and because the protective film is sticky, a large amount of UV material coated on the surface will stick off during the tear-off process, so the actual effect is relatively poor.


At present, the most advanced method in the world is the co-extrusion method. This method is to melt and extrude the PC main material and the UV material separately in the extruder at high temperature, merge in the mold, and then drain the flow channel in the mold to form a dense protective layer on the PC surface. However, changes in temperature, speed, pressure, etc. in actual production by this method will affect the distribution of UV material on the surface of the plate, making it uneven in thickness over the entire width of the plate.



Want to get the best product quote?

Get the best quote fast within 24 hours.

Table of Contents

Ask For A Quick Quote

We will contact you within 1 working day, please pay attention to the email with the suffix “”

New Product Special Offer

Dear Sirs/Madam:

UNQ specially invites all friends, as long as you inquire about products through our website, there will be gifts and discounts.

Don’t miss this opportunity, come and contact us!

Date: Aug.1st- Sept.30th,2023