How to distinguish between industrial bristles made of PP or Pa

Industrial brushes are widely used in our daily life. There are many kinds of brushes on the market. When someone asks about the bristles, they can't answer. How can we distinguish whether the industrial bristles are PP or Pa?
Industrial brush literally means well understood. Its raw material is composed of "wool". The function is "brush", which adds up to a brush. Its functions include: cleaning, polishing, polishing, sealing, dust prevention, filtering, etc. The most important part of industrial brush is "hair". General wool materials are animal hair, plant hair, plastic, metal wire and abrasive wire. The cost of animal hair will be relatively high, and the brush of plant hair will be easy to lose. Metal wire and abrasive wire are mainly used for industrial purposes. Plastics, including PA / PP / PBT / PE / PET, have a high probability of occurrence and the most commonly used and affordable price. PBT / PE / pet is a micro toxic material, PA / PP is non-toxic and is the first choice of customers, and PA / PP is the most suitable for PA.
1. PP, polypropylene is also a thermoplastic polymer, acid and alkali resistant, but it has poor flexibility compared with PA. it can also be made into hair of various diameters and colors, because acid and alkali can be used for medical purposes.
2. PA, nylon / nylon, is a thermoplastic polymer with high wear resistance, strong elasticity, good flexibility and good recovery after twisting. It can be made into wool of various diameters and colors.