Does Perspex stop UV light? Why it matters more than you think

Natural light plays an important role in making a home feel bright, open and welcoming, completely changing the feel of a space. It’s one of the reasons large windows, open flows and glazed doors are so popular in modern homes.

However, sunlight is made up of different types of light waves, and not all of them are completely harmless. Our natural daylight is made up of three main light waves:

• Visible light: the light we can see, that provides brightness and colour
• Infrared: producing the heat that warms our skin
• Ultraviolet (UV): rays sitting just outside our visible spectrum

Although our eyes can’t physically see UV radiation, we can see its effects over time. Prolonged exposure to UV light can cause fabrics to fade, surfaces to discolour and materials to deteriorate faster than expected.

In this blog we’ll discuss what UV light is, its effects and how Perspex can protect your home from sun damage.

Does Perspex stop UV light?

Yes, Perspex has UV-resistant properties which block harmful UV radiation while still allowing 92% of visible light to pass through.

So that’s good news: by choosing Perspex, with its UV blocking properties, you can stop unwanted sun damage to your home.

For products like table covers, greenhouse panels, secondary glazing and photo frames, this balance between visibility and protection makes Perspex a practical long-term solution.

What is UV light and should you be concerned about it?

Although invisible to the human eye, UV radiation is incredibly powerful and used in a wide range of technical processes, everything from sterilising water and medical equipment to curing nail polish.

UV light occurs naturally in sunlight and while small amounts are unavoidable, it can be surprising just how much damage direct sunlight can cause inside the home.

UV exposure can contribute to:

• Bleaching wood tables and furniture
• Fading photographs and artwork
• Discolouring fabrics like curtains and sofas
• Yellowing or brittleness in paper and plastic

The really annoying thing is you only realise it’s happened when it’s too late and irreversible damage has been done to your home interior.

How does Perspex reduce UV light?

Let’s dive into the science. Acrylic sheet is a thermoplastic known scientifically as polymethyl methacrylate (PMMA). It’s manufactured by the polymerisation of methyl methacrylate monomers into long, stable chains that form a non-crystalline, amorphous structure.

Sounds complicated right? Well, the way Perspex works is pretty simple: the material absorbs and filters portions of harmful radiation before it can pass completely through the sheet, almost numbing the effects. Visible light continues to travel through the acrylic as normal, which is why a clear Perspex sheet remains so transparent. In fact, it’s even clearer than glass of the same thickness, but weighs around half as much.

What’s the difference between Perspex and acrylic sheet?

While many people use the terms interchangeably, Perspex is actually a brand name of acrylic sheets, much like Hoover became a well-known term for a vacuum cleaner. Not all acrylic sheets are Perspex, but all Perspex is acrylic sheet.

Although they share the same scientific makeup, not all acrylic is made to the same standard. Quality is of utmost importance to us, which is why we only supply high-quality branded acrylic, like Perspex, rather than lower-grade alternatives.

Perspex delivers excellent optical clarity, durability and long-term performance, everything you want when protecting your home.

Does every acrylic sheet withstand UV?

No, not necessarily. Firstly, there are two terms we often hear when discussing UV: UV stable and UV blocking.

UV stable materials are manufactured to withstand sunlight without degrading. We’re talking about the plastic itself and its ability to resist yellowing, cracking and weakening when exposed to UV rays over long periods.

UV blocking materials refer to what’s behind the plastic and the ability to stop ultraviolet rays from passing through, giving protection to furniture, plants, fabrics and even people.

Due to its molecular structure PMMA is naturally UV stable as it lacks vulnerable chemical groups such as aromatic rings or halogens that make other plastics degrade quickly in daylight. It absorbs and disperses much of the UV energy it meets, helping the material stay clear and strong. That being said, lower-grade acrylic sheets may fall victim to UV rays with white plastics discolouring and greenhouse panes turning brittle.

Where Perspex really comes into its own is as a UV blocker. PMMA, although itself resistant to UV, doesn’t instantly provide protection for the things behind it. Perspex treats its plastic with UV absorbers, acting like a sponge to absorb UV photons before they can pass through the material and instead releasing them in a harmless form, usually heat. Without these added absorbers art will fade behind acrylic, plants may scorch and fabrics bleach.

This is why the quality of the acrylic sheet you choose matters and we would always recommend choosing a trusted brand.

How can Perspex help protect your home from UV light?

There are some really straightforward actions you can take to protect your home, garden and belongings from UV light. By choosing trusted quality Perspex you can avoid costly replacements, repairs and degrading.

Greenhouse glazing that lasts outdoors

Greenhouse glazing spends years exposed to direct sunlight so durability matters. Quality Perspex acrylic is UV stable, helping it resist yellowing, brittleness and clouding over time. It’s also lighter and stronger than glass, making it resilient to rogue footballs and bad weather.

We make replacing greenhouse panels easy. As well as offering standard sizes, we can cut your greenhouse windows to size, giving you the exact measurement and shape required.

UV absorbing secondary glazing

Using Perspex secondary glazing is an excellent way to protect your home interior from sun damage while providing extra warmth. Our bespoke magnetic secondary glazing kits are quick and effective, not to mention a much cheaper alternative to double glazing.

Not only do their UV blocking properties absorb UV rays that could damage your furnishings, floors and curtains, they’re also beautifully clear and won’t turn milky or yellow with age.

Simply give us the dimensions of your windows and follow our step-by-step installation guide to fit your secondary glazing without the need for professional tradesmen.

Protecting your tabletops

With the popularity of large windows and bifold doors in dining spaces continuing to grow, homes are becoming brighter and more open than ever. While a dining space filled with natural light is great, all that sun can take its toll on expensive dining furniture. You may notice wood bleaching, varnishes cracking, and in some cases even warping can occur.

Adding a protective Perspex table top helps shield your furniture from everyday sun damage while prolonging the life of your table. They’re also easy to wipe clean, making them a highly practical choice for busy family homes.

For something more decorative, our coloured Perspex table protectors add personality to a space while offering even greater protection. The added pigment helps reduce light transmission to the surface underneath even further, while the acrylic itself is designed to maintain its vibrancy without yellowing or fading.

Shielding art with acrylic frames

UV light is one of the biggest causes of fading in art prints and photographs, especially in bright rooms with large windows or direct sunlight exposure. Our range of acrylic picture frames made from quality clear Perspex sheet help reduce UV exposure while still providing excellent clarity and visibility.

Perspex is lightweight, shatter-resistant and less likely to break during handling than glass, making it a practical choice for both home and commercial displays.

Keep your home protected from harmful UV light

Natural light makes a home feel bright and inviting, but long-term UV exposure can gradually fade furniture, artwork, fabrics and plastics. By introducing quality Perspex acrylic into your home and garden you can reduce harmful UV rays while still allowing excellent light transmission. Protect the things you love inside your home without sacrificing brightness.

If you have any questions about our cut to size plastic products from greenhouses and glazing to frames and furniture protectors, feel free to contact us and our team will be happy to help.