From Prist,  http://pristaerospace.com/hi-flash/FAQ/index.html#doAndNotDo

Prior to 1994, PRIST® was made to a Military Standard MIL-I-27686, which specified Ethylene Glycol Monomethyl Ether (EGME). Provisions were made to have this product certified as a pesticide with the EPA. This allowed the product to be advertised as having the ability to retard growth of microbes in aviation fuels. The correct term is for the additive is microbiostat (-stat means it controls or retards growth by putting the microbes in a static condition), it is not a true microbiocide, (-cide means it kills microbes).

With all of the new EPA requirements, it became economically prohibitive to certify the new DiEthylene Glycol Monomethyl Ether, DiEGME based additive as a pesticide. Summarizing the above, it is widely believed that DiEGME does have a retarding effect on microbial growth; however, we no longer officially claim this property for the PRIST® Hi-Flash™ Fuel Additive.

 

The airforce calls it “Apple Butter” or apple jelly

 

http://swri.org/3pubs/ttoday/spring03/pdfs/deadly-spread.pdf

 

http://www.swri.org/9what/releases/2002/apply_jelly.htm

 

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