The material of plastic stool

- Feb 14, 2019-

      Polypropylene is a thermoplastic resin made by polymerization of propylene.Relatively heat and corrosion resistant.It is the lightest general-purpose plastic because of its low density.But they age easily.The melt mass flow rate (MFR) is usually 1~100.PP materials with low MFR have better impact resistance but lower tensile strength.For materials with the same MFR, the impact strength of the copolymerized material is higher than that of the homogenous material.Due to crystallization, the shrinkage of PP is quite high, generally 1.6~2.0%.



    Polypropylene is a non-toxic, odorless, tasteless, opalescent, highly crystalline polymer with a density of 0.90 --"0.91g/cm3. It is one of the lightest varieties of all plastics at present.It is particularly stable to water, the water absorption rate is only 0.01 percent, molecular weight about 81,000 150 thousand.Good molding, but due to large shrinkage (1%~2.5%).The thick wall product is easy to sag, to some size precision higher parts, also is difficult to achieve the request, the product surface gloss is good, easy to color.