Alexei Volkov
Plastics are highly susceptible to UV damage, which can cause discolouration, loss of strength, and deformation. This is a particular concern for plastic products designed for outdoor use, such as those used in transportation, agriculture, construction, and recreation. To combat this, some plastics are manufactured with UV-resistant properties, either through the use of additives or by selecting materials that are naturally UV-resistant. While no plastic can be fully UV-resistant, certain types of plastics are more resistant than others and are therefore better suited for outdoor applications. So, which plastics are the most UV resistant?
| Characteristics | Values |
|---|---|
| UV-resistant plastics | Acrylic, Polycarbonate, Polyetherimide (PEI), PTFE, PVDF, PAI, POM, Polypropylene, Nylon, PVC, HDPE |
| Additives to increase UV resistance | Absorbers (benzophenones, benzotriazoles), Stabilizers (HALS), Scavengers |
| Effect of UV radiation on plastics | Discoloration, reduced impact and tensile strength, deformation, loss of elongation, fading |
| Factors to consider when choosing UV-resistant plastics | Impact resistance, strength, outdoor suitability, temperature fluctuations, cost |
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What You'll Learn
HDPE is a common thermoplastic with strong UV resistance
Plastics are highly susceptible to UV damage, which can cause discolouration, loss of tensile strength, and deformation. However, HDPE (high-density polyethylene) is a common thermoplastic with strong UV resistance, making it ideal for outdoor applications. It is often used in playground equipment due to its durability and soft qualities, and unlike other thermoplastics, it does not form sharp edges when it breaks.
HDPE is highly resistant to acids, bases, and alcohols, and it can even repel graffiti. It is also known for its strong resistance to photodegradation, which is the breakdown of chemical bonds in polymers caused by UV radiation. This makes HDPE a popular choice for open-air infrastructure, containers, toys, outdoor furniture, and pipes.
While HDPE naturally has some UV resistance, it can be further enhanced by adding anti-UV components during production. This ensures that HDPE products can withstand prolonged UV exposure and extends their lifespan. Additionally, HDPE is more affordable than other UV-resistant plastics like polycarbonate, making it a cost-effective option for various applications.
However, it is important to note that HDPE may require additional measures to minimise UV exposure, such as using UV-resistant coatings or protective films. This is because, over time, HDPE will gradually degrade when exposed to UV radiation, especially if the intensity of UV rays is high. Therefore, incorporating UV stabilisers or inhibitors can help extend the life of HDPE products by sacrificing themselves to protect the material.
In summary, HDPE is a versatile and durable thermoplastic with strong UV resistance, making it suitable for a wide range of outdoor applications. Its resistance to photodegradation, affordability, and excellent mechanical properties, such as stiffness and impact resistance, contribute to its popularity in industries such as transportation, agriculture, construction, and recreation.
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Acrylic is a popular choice for outdoor use
Plastics are highly susceptible to UV damage, which can cause discolouration, loss of tensile strength, and deformation. However, some plastics are more resistant to UV radiation than others. Acrylic is one of the top choices for outdoor use due to its excellent UV resistance.
Acrylic plastic is a popular choice for outdoor applications such as signs, displays, light fixtures, decorative panels, and coloured lenses. It is also used as a replacement for glass due to its lightweight and durable nature, as well as its ability to be manufactured with high optical clarity. Acrylic can withstand high levels of UV light without significant degradation, making it ideal for prolonged outdoor exposure. It can also withstand extreme temperatures, from extreme cold to temperatures of up to 180°F, as well as saltwater, without compromising its structural integrity.
Acrylic's UV resistance makes it a worthwhile investment for specific applications. However, it is important to note that acrylic is not very strong. It is rigid and brittle, making it unsuitable for load-bearing parts or applications requiring long-term durability. Despite this drawback, acrylic's UV resistance and other favourable characteristics make it a popular and effective choice for various outdoor uses.
When compared to other materials, plastic is generally superior for outdoor use. Wood, for example, rots and splinters in the rain, whereas plastic can withstand harsh weather conditions, including snow. Additionally, many plastics offer UV resistance, durability, and fade resistance. Acrylic plastic, in particular, stands out for its exceptional weather resistance, making it a reliable option for outdoor applications.
In summary, acrylic is a popular and effective choice for outdoor use due to its excellent UV resistance, weather resistance, and ability to withstand extreme temperatures and saltwater. While it may not be suitable for load-bearing applications, its unique characteristics make it a valuable material for a range of outdoor purposes.
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Polycarbonate is a strong, impact-resistant plastic
Polycarbonate is a good electrical insulator with heat-resistant and flame-retardant properties, making it suitable for products associated with power systems and telecommunications hardware. It is also used in the construction industry for domelights, flat or curved glazing, roofing sheets, and sound walls. Polycarbonate is a common material in 3D FDM printing, producing strong plastic products with high melting points.
Polycarbonate is also used in the automotive industry, where its low weight and high impact resistance make it well-suited for automotive headlamp lenses. However, polycarbonate automotive components require outer surface coatings due to their low scratch resistance and susceptibility to ultraviolet degradation (yellowing). Polycarbonate can be laminated to create bullet-proof "glass", although the term bullet-resistant is more accurate for thinner windows.
Polycarbonate is commonly used in eye protection and other projectile-resistant viewing and lighting applications. Polycarbonate lenses protect the eyes from UV light and are used in eyeglasses, sunglasses, camera lenses, swimming goggles, and SCUBAs masks. Polycarbonate is also used in injection-molded drinking bottles, glasses, and food containers, although the use of BPA in polycarbonate manufacturing has raised concerns, leading to the development of "BPA-free" alternatives.
Overall, polycarbonate is a strong and impact-resistant plastic with a wide range of applications across various industries. Its versatility, durability, and transparency make it a valuable material in many fields.
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Torlon is a stiff, crack-resistant plastic
Plastics are highly susceptible to UV damage. Long-term exposure to UV radiation can cause discolouration, reduced impact and tensile strength, and deformation of the material. Therefore, it is essential to select UV-resistant plastics for outdoor applications.
Torlon, also known as Torlon PAI (Polyamide-Imide), is a high-performance, melt-processable thermoplastic. It is one of the most expensive plastics on the market and is well-suited for severe service environments. Torlon combines nylon and polyimide, resulting in a stiff, chemically resistant plastic with a high melting point. Its exceptional mechanical and thermal properties are attributed to an extended curing process that lengthens the PAI polymer chain and increases its molecular weight.
Torlon exhibits excellent impact resistance and elongation, retaining its mechanical strength, stiffness, hardness, and creep resistance across a wide range of temperatures. It demonstrates superior wear resistance, particularly in unlubricated high-speed applications. Torlon is commonly used in pump components, bearings, rollers, automotive transmission components, and electronic equipment.
Torlon's UV resistance makes it ideal for outdoor applications such as piping, fittings, seals, and gaskets, where impact and crack resistance are crucial. Other UV-resistant plastics include Acrylic, HDPE, Polycarbonate, and Polyetherimide (PEI). These plastics are commonly used in outdoor signage, playground equipment, safety equipment, and automotive applications.
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PTFE is a flexible, chemical-resistant plastic
Plastics are highly susceptible to UV damage. When exposed to UV radiation, the sun's rays break down the chemical bonds in polymers, causing plastics to degrade and disintegrate over time. This process, known as photodegradation, leads to discoloration, reduced strength, and deformation of the plastic material. Therefore, it is crucial to select UV-resistant plastics for outdoor applications or products that will be exposed to sunlight.
PTFE, or polytetrafluoroethylene, is a versatile polymer that exhibits excellent chemical resistance, low friction, and flexibility. Its chemical composition includes carbon and fluorine, making it resistant to damage from UV rays. PTFE is commonly used in outdoor applications such as bearings, non-stick surfaces, and gaskets. Its UV resistance, combined with its non-stick nature and self-lubricating properties, makes it a valuable material for various industries.
PTFE's flexibility sets it apart from other plastics. This attribute allows it to bend without breaking, enhancing its durability in dynamic environments. Additionally, PTFE's chemical resistance contributes to its longevity by preventing reactions with substances it comes into contact with. This resistance to chemicals is a critical factor in maintaining the integrity of PTFE products over time.
The low friction coefficient of PTFE is another notable feature. This characteristic, often referred to as its self-lubricating property, reduces the need for external lubricants and enhances the performance of moving parts. PTFE's non-stick nature further emphasizes its ability to resist adhesion and friction. These unique properties make PTFE ideal for applications where smooth surfaces and reduced friction are essential.
PTFE is also an excellent electrical insulator, providing exceptional electrical insulation. This feature makes it suitable for electrical applications where insulation and protection from electrical currents are required. Overall, PTFE's flexibility, chemical resistance, low friction, and electrical insulation properties make it a versatile and reliable plastic for a wide range of UV-resistant applications.
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Frequently asked questions
Some of the most UV-resistant plastics include HDPE, polycarbonate, PTFE, PAI, PEI, and acrylic.
UV resistance in plastics refers to a material's ability to avoid degradation caused by the absorption of UV radiation. The sun's UV rays break down chemical bonds in polymers, causing plastics to wear down and disintegrate over time.
Plastics achieve UV resistance through the use of additives such as UV stabilizers, black coloration (often using carbon black), or protective surface coatings like paint or metallization.
When plastics are exposed to UV radiation, they either absorb it or produce free radicals that negatively affect their mechanical properties. This can lead to discoloration, reduced impact and tensile strength, and overall deformation of the material.
Applications that require UV-resistant plastics include transportation, agriculture, construction, science, recreation, and goods for homes. Any product that spends significant time outdoors exposed to the elements should be manufactured using UV-resistant plastics.
