These spill pillows are usually deployed under large leaks (they can hold higher volumes of fluid) or in tight, cramped areas. ES-644/645 White Pillows are used for oil, fuel, hydrocarbon, or lubricant cleanup; they will float on water and only absorb oil. ES-641/642 Grey Universal Pillows can be used for oil, fuel, hydrocarbons, lubricants, water, antifreeze, coolants, fertilizers, and non-aggressive solvents. Not for marine spills (absorbs water). ES-647/648 Yellow Hazmat Chemical Pillows can be used for all water based and oil based fluids, but also designed for aggressive liquids like acids and bases.