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PP and PE are difficult to distinguish. There is no way. Professional shunting master can not distinguish PP and PE.
The most commonly used plastics in daily necessities are PP and PE. When two products are put in front of you, one is PP and the other is PE, so you can distinguish them? It's hard to tell. What PP brightness is brighter or what PE is easy to deform. The mould can achieve the same brightness and no deformation.
PP is divided into ordinary PP and copolymerization, ordinary PP is 1120, and ordinary PP is more brittle than copolymer PP. Especially in winter, it is easy to crack when it falls on the ground. If it is mixed with some copolymers, it will increase flexibility, and it is not easy to crack on the ground.
PE is divided into HDPE and LDPE. PE material is relatively strong. It is typical that the turnover boxes we use are made of HDPE. In the workshop, if you throw the turnover box, it will not break or crack. LDPE is a soft material. Some lids use this material.