AA-9601E was the first specification used for a dry degreasing and cleaning agent needed by the military. It was followed by P-D-680, or Stoddard solvent, which is a federal specification for dry cleaning and degreasing solvents, widely used by the Department of Defense for a range of everyday maintenance operations. Due to its environmental disadvantages, it was cancelled in December 1999.
MIL-PRF-680A simply consists of the four types of petroleum distillates at the top of the page.
MIL-PRF-680B also consists of the four types of petroleum distillates. It directly replaced P-D-680. MIL-PRF-680B has a lower aromatic content than its predecessor, equating to reduced odour and non-volatile residue. However, it still contains the same concentration of VOCs as P-D-680, though is free of Hazardous Air Pollutants (HAPs).
MIL-PRF-680C is the most recent specification, approved in March 2010. It denotes a 62°C flash point, evaporation without residue, and is approved for government and military use.