Sofia Martinez
Plastic turning yellow is a common issue, and there are several factors that can cause this discolouration. The most significant contributor is exposure to UV light, particularly from sunlight, but also from fluorescent lighting. Other factors include heat, cigarette smoke, fire retardants, formaldehyde, and oxygen. While it is difficult to prevent plastic from turning yellow altogether, there are some measures that can be taken to slow down the process. These include storing plastic items in a dark place, away from sunlight, and using UV-free lightbulbs. Additionally, keeping plastic items in a cool, well-ventilated space can help, as can using products like UV protectants and silica gel to minimise the effects of UV light and moisture.
How to Keep Plastic from Turning Yellow
| Characteristics | Values |
|---|---|
| Cover | Use a cover, blanket, or box to protect plastic items from sunlight and UV light exposure. |
| UV Protection | Use UV-protectant products like 303 Aerospace Protectant or UV-free light bulbs. |
| Avoid Heat | Store plastic items in a cool place to prevent yellowing caused by extreme temperatures. |
| Smoke-Free Environment | Keep plastic items away from cigarette smoke, as smoke can contribute to discolouration. |
| Moisture Control | Use silica gel to absorb moisture and help prevent corrosion, which can contribute to plastic yellowing. |
| Light Considerations | Avoid fluorescent lighting and energy-saving CLF light bulbs. Encapsulated bulbs can reduce UV emissions. |
| Hydrogen Peroxide Treatment | Use hydrogen peroxide and direct sunlight to whiten yellowed plastic (use with caution). |
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What You'll Learn
Avoid direct sunlight
Sunlight is the biggest cause of plastic turning yellow, so it is important to avoid direct sunlight when trying to prevent discolouration.
Firstly, it is worth noting that not all plastic items are equally susceptible to yellowing. Some machines are far more badly affected than others, such as SNES and Apple Mac cases. This is due to the type of plastic used and the presence of fire-retardant materials, such as bromine.
To avoid direct sunlight, it is recommended to keep plastic items covered when not in use. This could be done with a dark blanket or sheet, or by storing the items in a box, cupboard, or drawer. If the plastic item needs to be displayed, it is recommended to use UV-free light bulbs or encapsulated energy-saving bulbs, as these filter out a substantial amount of UV light.
In addition to avoiding direct sunlight, it is also important to consider other factors that can contribute to plastic yellowing, such as heat, humidity, and exposure to UV light from other sources, such as fluorescent lighting. Keeping plastic items in a cool, dry place can help to slow down the yellowing process.
It is also worth noting that some people have reported plastic items turning yellow even when stored in dark locations with no direct sunlight. This suggests that other factors, such as exposure to oxygen or certain chemicals, may also contribute to plastic yellowing.
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Use UV-free light bulbs
One of the most significant causes of plastic yellowing is exposure to ultraviolet (UV) light. This could be from direct sunlight, fluorescent lighting, or other artificial light sources. Therefore, one way to prevent plastic from turning yellow is to use UV-free light bulbs.
UV light initiates reactions in the backbone of the polymer structure, leading to the characteristic yellow colour change. By using UV-free light bulbs, you can reduce the likelihood of this colour change occurring. These bulbs do not emit UV rays, which are the primary cause of plastic yellowing.
When choosing light bulbs for your space, consider the type of lighting. Fluorescent and energy-saving CFL light bulbs should be avoided, as they produce UV light. If you must use energy-saving bulbs, opt for ""encapsulated" bulbs, as the glass dome filters out a significant amount of UV light.
Additionally, halogen bulbs are not recommended, especially if you are displaying items through a glass shelf, as the heat emitted from these bulbs can also contribute to plastic yellowing.
Instead, you can use LED lights, such as those recommended by IKEA, to illuminate your space safely. These lights are less likely to emit the UV rays that cause plastic to yellow.
By implementing these lighting changes, you can effectively reduce the UV exposure of your plastic items and help prevent them from turning yellow over time.
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Store in a cool, dark place
Storing plastic items in a cool, dark place is a good way to prevent them from turning yellow. Exposure to sunlight is a common cause of discolouration, so keeping items away from direct sunlight is crucial. Even fluorescent lighting can produce UV light, which accelerates the yellowing process. Therefore, storing plastic items in a dark location, such as a cupboard, box, or drawer, can help shield them from harmful light exposure.
However, it is important to note that simply storing plastic items in a dark place may not be sufficient to prevent yellowing entirely. Some factors other than light exposure that can contribute to plastic discolouration include temperature, humidity, and exposure to cigarette smoke. Hence, maintaining a cool storage environment is essential. Heat can accelerate yellowing, so keeping items in a cool, well-ventilated area can help slow down the discolouration process.
Additionally, consider using a UV protectant, such as 303 Aerospace Protectant, on your plastic items. While this may not be necessary if the items are kept in a dark place, it can provide an extra layer of protection against UV rays. If possible, use encapsulated energy-saving light bulbs, as the glass dome filters out a significant amount of UV light.
To further protect your plastic items, ensure they are stored away from potential sources of heat and cigarette smoke. Keeping them in a well-ventilated area can also help prevent the build-up of formaldehyde, which is another potential cause of plastic discolouration. By combining proper storage in a cool, dark place with measures to minimise heat, smoke, and formaldehyde exposure, you can effectively prevent plastic items from turning yellow.
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Keep away from smoke
Keeping plastic items away from smoke is a crucial step in preventing their discoloration to yellow. Cigarette smoke, in particular, is a common cause of plastic turning yellow, along with other factors such as age, temperature, and fire retardants.
To keep plastic items from turning yellow due to smoke exposure, it is essential to avoid smoking near them. This includes both direct smoking and secondhand smoke exposure. If you are a smoker, it is advisable to smoke outdoors or in a well-ventilated area away from plastic items. Additionally, ensure that any ashtrays or smoking-related items are kept away from plastic surfaces to prevent indirect exposure to smoke residue.
Proper storage of plastic items is also crucial in protecting them from smoke. Keep plastic items in a well-ventilated and smoke-free area. If possible, store them in airtight containers or sealed bags to minimize their exposure to smoke particles and odors. It is also beneficial to use odor absorbers or air purifiers in the storage area to eliminate any smoke odors or particles that may come into contact with the plastic items.
For larger plastic items or those that cannot be easily stored away, regular cleaning can help reduce the buildup of smoke residue. Use mild soap and water to wipe down the plastic surfaces, removing any smoke film or stains that may develop over time. Microfiber cloths are ideal for gentle cleaning without scratching the plastic surface.
In addition to keeping plastic items away from smoke, it is essential to address other factors that can contribute to yellowing. Minimizing exposure to direct sunlight and UV light is crucial, as UV rays accelerate the discoloration process. Store plastic items away from windows or use UV-protective curtains or films to block UV rays. Additionally, avoid using fluorescent or energy-saving light bulbs that emit UV light, opting instead for LED lights or encapsulated energy-saving bulbs.
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Use hydrogen peroxide to reverse yellowing
The yellowing of plastic is caused by a combination of factors, including exposure to sunlight, UV light, extreme temperatures, humidity, and certain chemicals. While it is challenging to prevent plastic from turning yellow, there are methods to reverse this process and restore its original colour. One effective approach is the use of hydrogen peroxide, a chemical agent that can remove the yellowed layer and restore the plastic's appearance.
To use hydrogen peroxide for reversing yellowing, follow these steps:
- Prepare a workspace outdoors or in a well-ventilated area. Set up your workspace outside where the plastic item will receive ample direct sunlight. Alternatively, you can use a UV lamp if sunlight is not available.
- Protect your hands with gloves and put on safety goggles to shield your eyes from any splashes.
- Pour hydrogen peroxide into a clear plastic container or bag. Make sure you use 3% or 12% hydrogen peroxide solution, which can be purchased from stores or online.
- Submerge the yellowed plastic item in the hydrogen peroxide solution. Ensure that the item is completely covered by the liquid.
- Place the container with the submerged item in direct sunlight or under a UV lamp. The UV light is essential for the process to work effectively.
- Allow the plastic item to soak for 3 to 4 hours. For more severe yellowing or larger items, you may need to increase the soaking time up to 12 to 24 hours.
- Remove the item from the solution and rinse it thoroughly with clean water. Ensure that you remove any excess peroxide or cream from the item during this step.
- If necessary, use a soft-bristled brush or an old toothbrush to gently scrub the plastic surface, especially in areas with stubborn discolouration.
- Allow the plastic item to air dry completely before using it.
This method is particularly effective for small items like phone cases, electronic components, and toys. However, it is important to exercise caution when using hydrogen peroxide. Avoid letting the solution dry on the plastic, as it may cause undesirable bleaching effects. Additionally, always wear protective gear, such as gloves and safety goggles, when handling chemicals.
While hydrogen peroxide can effectively reverse yellowing, it is important to note that the results may be temporary. The process may need to be repeated periodically, as the treated plastic can become more prone to yellowing in the future. Therefore, it is advisable to use this method sparingly and explore other preventative measures, such as avoiding direct sunlight and UV exposure, to maintain the colour of your plastic items in the long term.
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Frequently asked questions
Keep plastic away from sunlight, fluorescent lighting, extreme temperatures, humidity, and UV light.
Avoid fluorescent and energy-saving CLF light bulbs. If you have no other option, use "encapsulated" energy-saving bulbs as the glass dome filters out UV light.
Formaldehyde from certain furniture, fire-retardant materials, cigarette smoke, oxygen, and heat can also cause plastic to turn yellow.
Store plastic items in a cool, dark place, such as a box or a cupboard, and use silica gel to keep moisture out and prevent corrosion.
Yes, you can use hydrogen peroxide or commercial hair developer (a cream version of hydrogen peroxide) to whiten plastic.
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