Polypropylene (PP) is a thermoplastic addition polymer composed of propylene monomers. It is widely used, including the packaging of consumer goods, plastic parts of automobile industry and textiles.

Xicha is a China chain tea brand operated by Shenzhen Meixixi Catering Management Co., Ltd., founded by Nie Yunchen on 20 12, and headquartered in Aerospace Science and Technology Plaza, Nanshan District, Shenzhen, which owns tea brand Xicha and baking brand Xicha Hot Wheat. The company relies on word-of-mouth marketing on social media to reduce advertising expenses. Young consumers are its main customers. Most stores are located in bustling shopping centers in first-and second-tier cities. Its famous product is cheese milk cover.