Do You Know The Difference Between EPS And EPP?

Let's talk about the molded products of EPP and EPS materials, how do they distinguish?
1. The ingredients are different (intuitively, the names are different first)
1. EPS (English full name: Expandable Polystyrene), Chinese name: expandable polystyrene, also known as Styrofoam.
2. EPP (English full name: Expanded polypropylene), Chinese name: foamable polypropylene.
Second, the production process is slightly different

Note: (1) When the EPS raw material is purchased, it is a crystalline particle, which needs to be pre-expanded into foam particles;
(2) When forming, EPS requires a small steam pressure, about 0.4-1.0; the steam input time and cooling time are also much lower than EPP; (3) When drying, the temperature requirement is also lower than that of EPP, about It is ok at 50-60 degrees, and the time is about: 4 hours;
Note: (1) EPP raw materials are different from EPS. The raw materials purchased from EPP are already foamed foamed particles, but the foamed particles need to be loaded (or pre-pressed). Due to the difference in the density of foamed particles , the required pressure is about 2-4 pressure, and the time is about 15 hours;
(2) When forming, EPP requires a high steam pressure, about 3+/-1 pressure, and the steam input time and cooling time are relatively much higher than EPS;
(3) When drying and shaping, the temperature requirement is also higher than that of EPP, about 80+/-5 degrees is enough, the time is about: 6-8 hours, and then natural cooling for 2-4 hours (related to the temperature difference between the outside and inside , the temperature difference is large, the time is longer, and the temperature difference is small, the time is short); if you want to know other differences, let’s listen to the next chapter to break it down!