Anti-fog

Source: Wikipedia, the free encyclopedia.

Anti-fog agents, also known as anti-fogging agents and treatments, are chemicals that prevent the

droplets on a surface which resemble fog. They are one of many additives used in the production of plastics.[1]

Development

Anti-fog agents were developed by

space walk that his helmet visor fogged, among other issues.[2] Cernan's suit was tested using the Spacecraft 9 life support system after the flight, when it was discovered that a small patch of the visor treated with an anti-fog solution remained clear of condensation. Later Gemini flights all included the anti-fog solution, for application prior to the space walk occurring.[3][4]

Application

Anti-fog agents are available as

exude from the inside to the surface.[5]

Agents

Most commercial anti-fog agents are

polysiloxanes are typical.[1]

Many other substances have been used as anti-fog agents including home-based recipes containing detergents.

One method to prevent fogging is to apply a thin film of detergent, but this method is criticized because detergents are designed to be water-soluble and they cause smearing.[6] Divers often use saliva,[7] which is a commonly known and effective anti-fogging agent.[8]

Uses

Underwater diving

A demister is a substance applied to transparent surfaces to stop them from becoming fogged with mist deposit, often referred to as fog.

Underwater Hockey players often spit into their masks and then wash the surface quickly with water to prevent mist buildup that can impair vision. Several products are commercially available such as Sea Drops that are generally more effective. New masks lenses still have silicone
on them from the manufacturing process, so it is recommended to clean the lenses with an appropriate mask scrub, then rinse the mask and then apply a demister solution.

See also
  • Fog – Atmospheric phenomenon
  • Fogging (photography) – Secondary exposure of undeveloped film to light, for fogging artifacts in photography

References

  1. ^
    doi:10.1021/ed070p713
    .
  2. ^ Millbrooke, Anne (1998). ""More Favored than the Birds": The Manned Maneuvering Unit in Space". In Mack, Pamela E. (ed.). From Engineering Science To Big Science. The NASA History Series. Archived from the original on 11 March 2010. Retrieved February 15, 2010.
  3. ^ Hacker, Barton C.; Grimwood, James M. (1977). "An Angry Alligator". On the Shoulders of Titans: A History of Project Gemini. The NASA History Series. Archived from the original on 11 March 2010. Retrieved February 15, 2010.
  4. ^ "My Experience as a Space Suit Test Subject". Retrieved February 15, 2010.
  5. About.com. The New York Times Company. Archived from the original
    on October 21, 2005. Retrieved February 15, 2010.
  6. ^ Rick K.; Burn. "Salclear Motorcycle Helmet Visor Anti-Fog". webBikeWorld.com. webWorld International. Archived from the original on 31 January 2010. Retrieved February 15, 2010.
  7. ^ "Mask Care - Have a clear view every dive". The Scuba Doctor. The Scuba Doctor. Retrieved February 15, 2010.
  8. ^ Dogey, Kent (July 26, 1991). "Mirror and method of mounting the same". Retrieved February 15, 2010.
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