How to Brighten Yellowed Plastic Using Various Methods

Yellowed plastic caused by UV light exposure can be a frustrating issue, but there are several methods to address it. This article explores various techniques to restore and brighten yellowed plastic, from DIY solutions to professional treatments.

Methods for Brightening Yellowed Plastic

Bleach Solution

Materials:

Hydrogen peroxide, 3-12% solution Bleach (sodium hypochlorite) Clean cloth or sponge

Steps:

Mix a solution of hydrogen peroxide, 3-12%, and a small amount of bleach (sodium hypochlorite) in a bowl. Soak the plastic in the solution for a few hours, or apply it directly with a cloth. Rinse the plastic thoroughly with water and dry it completely.

Baking Soda Paste

Materials:

Baking soda Water Soft cloth or sponge

Steps:

Make a paste by mixing baking soda and water. Apply the paste to the yellowed areas of the plastic and scrub gently with a soft cloth or sponge. Rinse the plastic with water and dry it after a few minutes.

Toothpaste

Materials:

Non-gel, whitening toothpaste containing mild abrasives Cloth

Steps:

Apply the whitening toothpaste to the yellowed areas of the plastic. Using a cloth, scrub the area gently. Thoroughly rinse the plastic and dry it.

Commercial Plastic Restorers

Step:

Look for products designed specifically for plastic restoration that mention UV protection and restoration capabilities.

UV Light Treatment

Caution: While UV light can help reverse yellowing, ensure it is used with caution. Placing plastic items in direct sunlight for extended periods can sometimes worsen the condition.

Oven Method (For Certain Plastics Only)

Note: Not all types of plastic can be safely treated with this method.

Steps:

Preheat your oven to a low temperature, around 150°F (65°C). Place the plastic items on a baking sheet and leave them in the oven for a brief period, typically 10-30 minutes. This method can soften the plastic and reduce yellowing but is not suitable for all types of plastic.

Precautions

Test any method on a small, inconspicuous area first. This will help ensure it does not damage the plastic. Wear gloves and work in a well-ventilated area when using chemicals. Results can vary based on the type of plastic and the severity of the yellowing. If the yellowing is severe or the plastic is valuable, consult a professional for restoration.

The Mechanism of UV Damage

The yellow color in plastic caused by UV light exposure is often due to a nitrogen atom that has been altered by the UV light. Therefore, simply painting over the plastic may not be enough to solve the issue.

Solutions for Deteriorated Plastic

In cases where the plastic has not just yellowed but also deteriorated, it is recommended to remove the layer and apply a dedicated paint for plastic.