Material Analysis of Plastic Chair Products by Chair Molds Manufacturers Polypropylene is a non-toxic, odorless and tasteless milky white high crystalline polymer with a density of only 0.90--0.91g/cm3. It is one of the lightest varieties of all plastics and is particularly stable to water. The water absorption rate in water is only 0.01%, the molecular weight is about 80,000~150,000, and the...