◆ Polypropylene (PP) is more rigid than polyethylene (PE)
PP flexural modulus is about 1.52Gpa, PE is only 207MGpa, chemical resistance is similar to PE. Take the Ace PP foam material of Japan Furukawa Electric Company as an example. Its mechanical properties such as tensile strength and tear strength are at the highest level of foam plastic. Its compressive strength is lower than that of hard PUR and foamed PS, but higher than that of soft PUR. , Both have medium compressive strength.

◆ Polypropylene has a high heat distortion temperature, which can be applied in the field of high temperature
Foamed polypropylene is usually able to withstand 130°C, which is much higher than the maximum temperature of polyethylene foam of 80°C. Foamed PP is a closed cell structure like foamed PE. Therefore, its thermal conductivity is not affected by moisture, and it is lower than foamed PE. It has significant thermal insulation, so it can be used as an advanced insulation material. .

◆ Good low temperature characteristics
EPP products show good performance even at -30℃.

◆ High energy absorption
Since the EPP product has a special cell structure, it absorbs the energy dissipated through the gas stagnation and compression in the cell, and has excellent resistance to pressure and energy. It is widely used in automobile bumper energy processing system and other anti-collision energy-absorbing components.

◆ Good stability of size and shape recovery
EPP products will recover their original shape immediately after being subjected to multiple continuous impacts and deflections without deformation, and have the ability of "memory".

◆ Suitable for repeated use
EPP products have good flexibility, can be used repeatedly, and are not easily broken.

◆ Light weight
EPP products have extremely light weight, can greatly reduce the weight, and can be used in heavy-weight parts such as aircraft and automobiles.

◆ Has good surface protection
EPP products are semi-hard shaped, with moderate hardness, softness, no scratches, bumps and objects in contact with it, and good surface protection.

◆ Small permeability and good buoyancy
Due to the closed-cell structure of EPP, its products have long-term, excellent floatability and low water permeability, even in salt water does not weaken its floatability.

◆ Good resistance to oil and chemicals

The chemical inertness of EPP makes its products resistant to oil and chemicals.

◆ Reusable environmentally friendly materials

It is easy to recycle and reuse, easy to decompose, the product does not contain toxic ingredients harmful to human body, and no toxic substances are produced by burning.

◆ Density heterogeneity

EPP products with different densities can be made.

◆ Good stability, can be used in different environments

EPP products have excellent durability, such as resistance to ultraviolet exposure, physical damage, extreme temperature (-30℃-130℃) wear and other harsh environments.

◆ Good sound insulation

EPP products have efficient noise isolation.

3. Application fields of EPP products

1. Food Packaging

In the rigid packaging market, the PP market has great potential. The density of foamed PP sheets listed abroad is 0.063g/cm3, and that of ordinary PP sheets is 0.91g/cm3. With the development of PP foam sheet products, it will undoubtedly strengthen its competitiveness in replacing PET in the food field.

Now microwave ovens and microwave foods have entered people''s family life, and the thermoformed food packaging containers of cross-linked foamed PP sheet can be used in microwave ovens due to their heat resistance up to 130°C, and are resistant to boiling water, high temperature stability, and surface feel Comfortable, people have a good impression of its environment. For example, thermoformed foamed PP with a density of 0.5-0.7g/cm3 and a thickness of 0.5-1.5mm is a raw material for producing tableware and beverage cups with high rigidity and good insulation. Foamed PP sheet with a density of 0.2-1.51g/cm3 and a thickness of 1.0-3.5mm is used to produce meat packaging materials, food packaging materials and bottle gaskets.

2. Buffer packaging

The most important performance required for cushion packaging is energy absorption. PP foam molded products can be used to withstand high loads, and its protection against repeated impacts is superior to foamed polystyrene (PS) molded products or foamed polyurethane (PUR). Therefore, the foamed PP can be used in shock-absorbing buffer packaging for computers, advanced medical appliances, precision instruments, audio-visual materials, cameras, glass ceramics, handicrafts, various household appliances, etc., so as not to be damaged and damaged during transportation. Because it can be directly recycled, the soft texture will not damage the surface of the packaged object, and there is a trend to replace PS foam materials in the field of electrical packaging.

According to statistics, in 1997, only two products, color TV and color picture tube, used 20,000 tons of PS foam. Hotec Folien believes that PP foam discs have a tendency to replace polystyrene molded discs. The user is interested that the PP foam sheet can be directly added to the forming-canning-sealing device from the curling roller. The recyclable foamed PP tray is very convenient for the handling and transportation of fruits and other agricultural products.

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