100% polypropylene Pillows quickly absorbs nearly any type of caustic, hazardous or unknown liquid — including acids, bases, solvents and chemicals. Color-coded Safety Yellow for fast identification. Pillows are easy to place in hard-to-reach areas — use under machines and leaky hydraulic hoses or wedge in corners cramped for space. Application : Catches leaks like a pan. Absorbs spills like a pad. It's one versatile product that works for many different jobs. Pillow's large surface area speeds the absorption process and shortens the overall response time.