The main raw material for making PP fabric is polypropylene, which is a type of polymer. Polypropylene itself can be produced with different grades and qualities. High-quality polypropylene polymers usually have a more regular molecular structure and fewer impurities. Additives might also be used in the process. For example, anti-oxidant additives are often added to prevent the degradation of the fabric caused by oxidation when it's exposed to air or sunlight over time. Stabilizers can be included to enhance the fabric's resistance to heat and maintain its performance under various temperature conditions.