The materials covered by this specification are non-aqueous cleaners that are free of hazardous air pollutants and contain a low amount (no more than 25 grams per liter) of volatile organic compounds. Uses include cleaning of aircraft components and ground support equipment. Products may be suitable for other cleaning applications. Type I cleaners are much less volatile than Type II cleaners; however Type II cleaners are somewhat more effective on heavy soils (such as greases and tire residues). Type III cleaners contain no VOCs and are used for specialized applications.