PP, also known as polypropylene, is a polymer made of polypropylene plus alkene reaction, is a white waxy material, transparent and light in appearance. The chemical formula is (C3H6)x, density is 0.89-0.91g/cm3, flammable, melting point 165℃, softening at 155℃, use temperature range is -30～140℃. Under 80 ℃ can resist the corrosion of acid, alkali, salt liquid and a variety of organic solvents, can be decomposed under the effect of high temperature and oxidation. The pp bristles are made of polypropylene, which is less flexible, wear-resistant and less repulsive than pbt, and is therefore used in many low-end cleaning brushes.

Although pp bristles are very cheap, they can be used to unclog circuit boards, why? Because pp itself is electrically charged, if coupled with high quality conductive toner, it will be a good hand for unblocking the current.