"We Have Your Air on Our Minds"

 
 



 

a i r b r a i n s
A R T I C L E S
F O R U M
N E W S


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MILDEW     

 

MILDEW

What is mildew?   Mildew is a mold. A mold such as mildew can decompose cellulose and lignin, therefore ruining paper and cellulosic fabrics that are not protected. Wood, paint, glue, and leather may be attacked by mildew also. Mildew mold secretes an enzyme that decomposes organic matter and uses it for growth and reproduction. High humidity is required to hydrate mildew cells and materials on which they can grow. Mildew is unsightly, produces an unpleasant odor, and often acts as an allergen that can create health problems.

What is necessary for mildew to grow? Mildew spores, or seed-like forms of mildew, exist almost everywhere. They will not grow and spread, however, unless certain conditions are met. There are many varieties of mildew, but generally the following conditions contribute to mildew growth:

  • Molds thrive on organic materials such as paper, leather, natural fibers or surfaces coated with the slightest amount of organic matter such as food or soil.

  • The optimal growth temperature range for molds is 77°F to 88°F (20°C to 30°C), though some growth may occur anywhere between 32°F to 95°F (0°C to 35°C)

  • Mildew requires moisture. The optimal growth range for mildew is over 50 percent relative humidity (RH). RH would have to be below 40 percent to stop all chances for mold growth.  A lower RH delays spore germination of molds, reduces the rate of mold growth, and lowers the number of cells produced

  • Molds are aerobic. That is, they require oxygen for growth.

  • Light is not required for mold growth. Mold growth can continue indefinitely without light.

  • Mold growth is promoted by a slightly acid condition.

  • Mold growth is inhibited by a variety of fungicides such as chlorinated phenols, copper napthenate or oleate. Coal tar creosote can be used on wood surfaces where paint is not to be used or where odor or appearance would not be objectionable. Ultra-violet radiation can kill mildew. Exposure to sunlight has been a mildew remedy since pre-air conditioning days.

  • Mold growth is slow to start and can take several months or seasons to get established. After growth begins, however, it is very rapid.

articles / buy books / contact / forum / news

[Top of Page]