Sofia Martinez
Plastic pipes are vulnerable to damage from UV light due to their polymer chains, which are susceptible to photo-oxidation. This process is similar to how UV light causes sunburns in humans. The impact of UV light on plastic pipes depends on the type of plastic and the duration of exposure. Some plastics, like CPVC, have better UV resistance due to their chlorine content, which acts as a barrier to UV light. However, even CPVC pipes can experience discolouration and reduced impact strength over time. Other plastics, like PEX, are more vulnerable to UV-induced degradation due to their chlorine-inhibiting antioxidants being consumed, leaving them susceptible to chlorine-induced oxidation and premature failure. This effect is accelerated by UV light exposure, even from indoor fluorescent lighting. To mitigate potential damage, plastic piping should be installed in shaded areas or buried underground, and regularly inspected for signs of UV degradation, such as discolouration, cracks, or brittleness.
| Characteristics | Values |
|---|---|
| Effect of UV light on CPVC pipes | Discoloration, reduced impact strength, no change in pressure-bearing capabilities |
| Effect of UV light on Polyolefins Plastic pipes | Consumes chlorine-inhibiting antioxidants, vulnerable to chlorine degradation |
| Effect of UV light on PEX pipes | Amplifies incompatibility with chlorine, reduced service life, chlorine-induced degradation, pinhole leaks |
| Effect of UV light on PVC pipes | Weakened walls, leakages, failures |
| Preventative measures | Store in shaded areas, paint with compatible latex/water-based paint, use UV-blocking material |
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What You'll Learn
- CPVC pipes are more resistant to UV light than Polyolefins plastic pipes
- UV light exposure can cause discolouration of plastic pipes
- UV light can reduce the impact strength of plastic pipes
- PEX piping is vulnerable to chlorine degradation when exposed to UV light
- Burying outdoor pipelines underground protects them from UV degradation
CPVC pipes are more resistant to UV light than Polyolefins plastic pipes
While CPVC pipes are not entirely immune to UV light damage, they are more resistant to it than Polyolefins plastic pipes. Polyolefins plastic pipes are mainly produced from oil and natural gas by polymerizing ethylene and propylene. Polyolefin-based piping, therefore, has a greater concern for UV light exposure.
UV light acts as a catalyst for the oxidation process within Polyolefins materials. The UV light activates the oxidation process and consumes the inhibiting antioxidants in the pipe material, which protect the pipe from chlorine-induced oxidation. As these chlorine inhibitors are consumed, the piping becomes vulnerable to attack from chlorine in the water.
CPVC pipes, on the other hand, are made from CPVC resin and additives. CPVC resin has good UV resistance due to its chlorine content, which acts as a barrier to UV light. The chlorine molecules replace the carbon in the hydrocarbon chain, preventing oxidation of the chain, which is the main reason for plastic degradation in plastics with high petroleum content. While some of the additives in CPVC pipes are prone to UV light and can cause discolouration and a slight reduction in the impact properties of the pipes, the pressure-bearing capacity of the pipes remains unaffected even after prolonged UV light exposure.
CPVC pipes have been successfully installed and functioning for over 50 years in regions with strong sunlight, such as South California, 30 years in the Middle East, and 20 years in India. This demonstrates the superior UV resistance of CPVC pipes compared to Polyolefins plastic pipes.
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UV light exposure can cause discolouration of plastic pipes
The sun's solar energy comprises three components: visible light, infrared radiation, and ultraviolet (UV) rays. While visible light is, well, visible to the human eye, UV light is a short-wavelength light that is invisible. UV light is the main concern when it comes to plastic pipes, as it can degrade them over time.
CPVC pipes, for instance, are made of CPVC resin and additives. While CPVC resin has good UV resistance, some of the additives are prone to UV light. As a result, prolonged exposure to UV light can lead to discolouration and a slight reduction in the impact properties of CPVC pipes. However, it is important to note that the pressure-bearing capacity of these pipes remains unaffected, even after prolonged UV light exposure.
Similarly, Polyolefin-based plastics, including LDPE, MDPE, HDPE, PPR, PEX, and PB, are susceptible to UV light exposure. In these materials, UV light acts as a strong catalyst for the oxidation process, consuming the chlorine-inhibiting antioxidants that protect the pipes from chlorine-induced oxidation. As a result, the pipes become vulnerable to attack from chlorine in the water, which can lead to discolouration and potential failures.
To limit discolouration, it is recommended to store and install plastic pipes in areas that are not directly exposed to sunlight. For outdoor pipelines, burying them underground provides full protection against UV degradation. Additionally, painting the pipes with a compatible latex or water-based paint can help minimize the impact of UV light and reduce discolouration.
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UV light can reduce the impact strength of plastic pipes
The sun's solar energy comprises three components: visible light, infrared radiation, and ultraviolet (UV) rays. UV light is a short-wavelength light that is invisible to the human eye. UV light can have negative effects on plastic pipes, including CPVC and PEX piping materials. While CPVC pipes have good UV resistance, some of the additives used in their composition are prone to UV light, which can lead to discolouration and a slight reduction in impact strength. This reduction in impact strength makes the pipes more susceptible to damage from external impact.
Similarly, PEX piping is vulnerable to UV light exposure, which destroys the material's chlorine inhibitors, leaving the pipe susceptible to chlorine degradation. This can significantly reduce the service life of the piping. PEX manufacturers advise against installing PEX piping within 5 feet of direct view from fluorescent and LED lighting without protecting the pipe with a UV-blocking material.
To limit discolouration and reduce the impact of UV light on piping materials, it is recommended to store and install pipes in shaded areas or paint them with a compatible latex or water-based paint. Burying outdoor pipelines underground provides full protection against UV degradation. Regular inspections of plastic pipes for signs of UV damage, such as discolouration, cracks, or brittleness, are crucial for early detection and timely repairs or replacements.
While some plastic pipes on the market are specifically formulated to resist UV radiation, these pipes are more common in industries other than plumbing. It is important for plumbing contractors to inform their clients about the potential risks of UV exposure to plastic piping and discuss protective measures to ensure the long-term durability and performance of the plumbing system.
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PEX piping is vulnerable to chlorine degradation when exposed to UV light
The effects of UV light on plastic piping depend on the type of plastic. PEX piping is particularly vulnerable to chlorine degradation when exposed to UV light. This is because UV light consumes the chlorine-inhibiting antioxidants in PEX piping, leaving the pipe vulnerable to chlorine-induced oxidation.
UV light acts as a catalyst for the oxidation process within PEX piping materials. This oxidation process can be initiated by sunlight or artificial light sources, such as fluorescent lights. In fact, one study found that UV exposure from fluorescent lights for eight hours is equivalent to one minute of sun exposure.
To prevent chlorine degradation in PEX piping, it is recommended to install the pipes in shaded areas or under structures that provide shade. PEX manufacturers also advise against installing PEX piping within five feet of direct view from fluorescent and LED lighting without protecting the pipe with a UV-blocking material.
Additionally, plumbing contractors should inform their clients about the potential risks of UV exposure to PEX piping and discuss protective measures. Early detection of UV degradation through regular inspections can allow for timely repairs or replacements, preventing more significant issues.
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Burying outdoor pipelines underground protects them from UV degradation
UV light can have a detrimental effect on plastic pipes, causing discolouration and weakening the material. This is due to the process of photo-oxidation, which occurs when UV light facilitates the degradation of a polymer surface in the presence of oxygen or ozone. This process reduces the polymer's molecular weight by attacking the hydrogen and carbon chain, degrading the material.
Burying outdoor pipelines underground is a highly effective way to protect them from UV degradation. This method provides full protection against UV radiation, which can otherwise cause significant damage to plastic pipes. When pipelines are buried, it is important to ensure proper trench depth and backfill material to avoid physical damage to the pipes. Regular inspections of outdoor plastic pipes should also be conducted to check for any signs of UV damage, such as discolouration, cracks, or brittleness.
While some plastic pipes on the market are specifically formulated to resist UV radiation, these are more common in industries other than plumbing. For example, furniture pipes used to make lawn furniture contain high amounts of UV inhibitors, which help to prevent the breakdown of polymer chains over time. In the plumbing industry, pipes made with CPVC (chlorinated polyvinyl chloride) are a good option for UV resistance. CPVC pipes have a high chlorine content, which acts as a barrier to UV light and prevents oxidation of the hydrocarbon chain.
However, it is important to note that CPVC pipes also contain additives that are prone to UV light. Prolonged exposure can lead to discolouration and a slight reduction in the impact strength of the pipes. Nevertheless, the pressure-bearing capacity of CPVC pipes remains unaffected even after prolonged UV light exposure. Overall, burying outdoor pipelines underground is the most effective way to protect them from UV degradation, but using UV-resistant pipes can also help mitigate the potential damage caused by UV light.
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Frequently asked questions
Yes, UV light can damage plastic pipes. However, the extent of the damage depends on the type of plastic.
UV light activates the process of photo-oxidation, which is the degradation of a polymer surface in the presence of oxygen or ozone. This process reduces the polymer's molecular weight by attacking the hydrogen and carbon chain, thus degrading the material.
Polyolefins plastic pipes are vulnerable to UV light. PEX pipes are also vulnerable as UV light destroys the material's chlorine inhibitors, making them more susceptible to chlorine degradation.
Plastic pipes should be installed in shaded areas or under structures that provide shade. Burying outdoor pipelines underground provides full protection against UV degradation. Painting the pipes with a compatible latex/water-based paint can also help minimise the impact of UV light.
CPVC pipes are made from CPVC resin and additives, with chlorine acting as a barrier to UV light. While prolonged UV exposure may lead to discolouration and a slight reduction in impact strength, the pressure-bearing capacity of CPVC pipes remains unaffected.
