WHAT IS THE DIFFERENCE BETWEEN EPP AND EPS?
Both expanded polypropylene(EPP)and expanded polystyrene(EPS)provide outstanding thermal insulation,energy absorption, multiple impact resistance, water and chemical resistance,and 100% recyclability. The white is EPS beads, the colorful is epp beads.
The difference between EPP and EPS Iies in the manufacturing process where the distinctive resin(polypropylene vs polystyrene)goes through a different process under tightly controlled conditions. Each process is briefly explained by below pictures.
Unique Properties of EPP
The EPP manufacturing process is complex. The polypropylene resin is combined with other ingredients and additives to form extruded pellets that are expanded to become consistently shaped beads of expanded polypropylene foam. EPP foam beads are injected under pressure and heat into shaping moulds. Variations may exist depending on the final product form and
specific client requirements. For example, air space added to the beads in the final moulded form enhances beneficial acoustical insulating effects and reduces weight. EPP has unique applications in the automotive industry due to its exceptionally high strength-to-weight ratio,shock absorption,compressive strength and buoyancy. lt is commonly coloured black for auto parts, but its textured surface can also take different colors for presentation-grade products.The standard white form is used for packaging. Here we attached some pictures to well help you get to know epp products.
Unique Properties of EPS
EPS manufacturing uses the polystyrene raw material,commonly spherical beads,in a thermoplastic process that expands and moulds the beads into the final product.
There is no extrusion involved, and the raw material is pre-expanded, unlike EPP manufacturing. Specifically,the tiny spherical polystyrene beads are expanded to about 40 times their original size in a heating process. ln the moulding stage,the expanded beads take their final shape according to their application,which can be anything from Iarge blocks to custom moulded designs.The large blocks can be sectioned to the required shape as panels or boards. ln its final form,the EPS is made up of 98% air, providing unique advantages in the building insulation and packaging industries,including lightweight-to-strength ratio,durability,superior thermal insulation and protection.The distinct advantage of EPS consists of the large volume standard sized blocks and sheets used for insulation,and the availability of different grades, textures and custom sizes. Also,EPS is ideal for low volume packaging pieces where mould costs are not warranted.
Conclusion:
while EPS has good insulating properties, it is not very durable. EPP, on the other hand, is a lightweight foam with excellent energy absorption characteristics. The material can withstand repeated shocks and deformations, earning high marks for usability. Foams molded from EPP also retain their high degree of dimensional stability when exposed to temperature extremes. The elasticity of EPP is very appropriate for packaging valuable and vulnerable products such as glass vials, organs or syringes. By combining EPS with EPP (Expanded Polypropylene) foam you get the best of both worlds.
