UVC Effects on Silicone: Yellowing or Damage to Respirators?

  • Thread starter Secan
  • Start date
In summary, the conversation discusses the effects of UVC on silicone, specifically in regards to respirators. It is mentioned that UVC can turn silicone yellow and there is a question about whether or not it can also cause damage to the silicone. The use of UV sanitizers on respirators is also mentioned, as well as the presence of UV absorbers in industrial silicone. It is recommended to check with the manufacturer for information on steam sterilization.
  • #1
Secan
141
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UVC is known to change colors of silicone to yellow. Does this only change the visual aspects or does it somehow damage them too?

Many doctors put their 3M respirators inside UV sanitizers. Most respirators are made of silicone. Would UVC just turn them yellow or damage the silicone which can affect the face seal?
 
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  • #2
I assume you mean typical germicidal 254 nm? Most silicones are translucent so damage is below the surface. Most industrial silicones include a UV absorber ("sunscreen") which may not be included in medical grade silicone. Check with the manufacturer, it may have been designed for steam sterilization.
 

1. How does UVC light affect silicone?

UVC light can cause yellowing or damage to silicone materials, such as those used in respirators, due to its high energy and ability to break down chemical bonds in the material.

2. What causes the yellowing of silicone when exposed to UVC light?

The yellowing of silicone when exposed to UVC light is caused by the breakdown of the material's polymer chains, which results in the formation of free radicals and discoloration of the material.

3. Can UVC light damage the structural integrity of silicone respirators?

Yes, UVC light can damage the structural integrity of silicone respirators by breaking down the material's polymer chains, which can weaken the material and potentially compromise its effectiveness.

4. How long does it take for UVC light to cause yellowing or damage to silicone respirators?

The amount of time it takes for UVC light to cause yellowing or damage to silicone respirators can vary depending on the intensity and duration of exposure. In general, the higher the intensity of UVC light and the longer the exposure, the faster the yellowing or damage will occur.

5. Can anything be done to prevent UVC-induced yellowing or damage to silicone respirators?

Yes, there are a few measures that can be taken to prevent UVC-induced yellowing or damage to silicone respirators. These include using UVC-resistant silicone materials, limiting exposure to UVC light, and using protective coatings or barriers to shield the silicone from direct UVC light.

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