It is in the same family as polyethylene but is stiffer than HDPE and maintains its mechanical properties better at higher temperatures. It has good chemical resistance. PP is white or colourless and can be coloured in virtually any PP a of about 900-910 kg/m3. In other words, PP floats in water. PP can be found in most applications, especially in the automotive industry, packaging items, multi-layered foil, technical parts, toys and medical supplies. Polymer of propylene is one of the types of plastic that is produced in greatest quantity.