EVA (ethylene vinyl acetate)

EVA (ethylene vinyl acetate) Material EVA (full name "ethylene vinyl acetate") - this substance belongs to the polyolefins obtained by copolymerization of ethylene and vinyl acetate monomer. EVA is distinguished as a separate material due to the percentage content of vinyl acetate. Unlike PVC (100% vinyl acetate) EVA, the vinyl acetate content is from 10 to 50%. EVA has properties similar to polyethylene, but surpasses it in strength. It is able to withstand deformation and return to its original shape. EVA is a lightweight fine material similar to the cured foam.
The main properties that characterize the material is EVA, we can note the following:
- Acoustic and thermal insulation properties;
- Buoyancy with low water absorption
- Suitability for thermo-forming.
The use of vinyl acetate is well known in such industries as automotive, healthcare, construction, Shoe industry and many others.
The most familiar to consumers example of using TPU flips flops. Their sole is made of Eva.
The souvenir industry is also widely used. An assortment of Souvenirs made of ethylene vinyl acetate are keyrings, promossi, glasses, photo frames, slates, calculators, magnets, stoppers for doors, toys, and more.

Has the following characteristics:

  • unusual ease – it is 4 times lighter than PVC;
  • material orthopedic, which means it is characterized by elasticity, elasticity, flexibility;
  • excellent cushioning;
  • high wear resistance;
  • the dielectric constant;
  • resistance to chemicals (oils, solvents);
  • hygienic (resistant to bacteria and fungi);
  • does not cause allergies, it can be used in all types of orthopedics.

The vinyl acetate — this substance belongs to the polyolefins obtained by copolymerization of ethylene, of vinyl acetate monomer.

Group acetoxy distributed in the ethylene group arbitrarily. The vinyl acetate content determines the mechanical properties of the copolymer, as well as its type (elastomer or thermoplastic). Most commonly used EVA with 10-50 %content of vinyl acetate. When 100 % of vinyl acetate is obtained a polyvinyl acetate (PVAC). Due to the high content fenilatilamina is resistant to oils, solvents, ozone and high temperature. Copolymers with a low content of acetate have properties similar to the properties of low density polyethylene. Besides the properties of the copolymers of vinyl acetate-dependent formation of side chains and molecular weight.

Ethylene vinyl acetate is lightweight and elastic material having good cushioning properties superior to polyethylene in the transparency and elasticity at low temperatures, has a high adhesion to various materials.

Experts distinguish two types of copolymer: elastomer and thermoplastic. Its type and properties determine the content of vinyl acetate. with a vinyl acetate content of from 10 to 50% use more often than any other. When the content 100% of the polyvinyl acetate vinyl acetate out. EVA is becoming quite resistant to solvents, ozone, oil and high temperature, if it has a large content of vinyl. If the content of acetate small, then in its properties, like vinyl acetate on polyethylene with low density.

The method of processing and scope of application

In addition, the ethylene vinyl acetate has found its application in various combinations with many other polymers (rubber, polyethylene, PVC, etc.).
Neoprene – chloroprene rubber (sponge rubber), one type of synthetic rubber. Endowed with good water resistance and high elasticity. In addition, it is soft, with porous structure material. The color of the material ranges from black or grey to dark brown.
The scope of the neoprene has a very wide border. It is used for making accessories and cases for small electronics, wetsuits, etcD. But also, this material is used by NASA scientists to create a transportable housing module. It is designed specifically for the international station in space.
The temperature range in which it is possible to use neoprene, ranges from -55 °C to +90 °C, and depends directly on the chemical composition of a particular sample material. EVA is great for the manufacture of the outer shell in the systems of cables, because it has excellent resistance to petroleum products and ultraviolet rays. The electrical properties of EVA loses a bit of other material, so use a sheath insulator more in thickness.
  • extrusion: films, sheets, hoses, cable jacket;
  • injection molding: Shoe soles, toys, isomate;
  • the production of hot melts ( B. hotmelt);
  • the production of polymers: hoses, cable sheathing, films, and soetc.
  • the manufacture of tourist mats, Shoe soles, toys – everything that flows under pressure.

The EVA copolymer used to prepare compounds with other polymers such as rubber, isopoliteia, as well as mixtures with fillers and additives.

This material is in the form of an aqueous dispersion has been widely used as a film former in water-dispersion paints. Dried in a special way aqueous dispersion of vinyl acetate — with a re-dispersing the powder, widely used in the production of dry building mixtures.

Operating temperature range: from -80 °C to +55 °C (short time up to +70 °C).

The ethylene vinyl acetate has many advantages:

  • has a high adhesion (adhesion) with the surfaces of other materials.
  • in its transparency and elasticity is superior to that of polyethylene at low temperatures;
  • has excellent damping properties;
  • elastic;
  • easy;

possesses properties similar to polyethylene, but surpasses it in strength. It is able to withstand deformation and return to its original shape. EVAпредставляет a lightweight fine material similar to the cured foam.

The main properties that characterize the material is EVA, we can note the following:

  • Acoustic and thermal insulating properties;
  • Buoyancy with low water absorption
  • Suitability for thermo-forming.

The use of vinyl acetate is well known in such industries as automotive, healthcare, construction, Shoe industry and many others.

The most familiar to consumers example of using TPU flips flops. Their sole is made of Eva.

The souvenir industry is also widely used. An assortment of Souvenirs made of ethylene vinyl acetate are keyrings, promossi, glasses, photo frames, slates, calculators, magnets, stoppers for doors, toys, and more.

The undoubted advantages, in relation to fishing include the following material properties of EVA:

  1. Excellent heat insulation properties. They are due to the fact that is a porous material containing in its structure a large number of microscopic air bubbles. Thanks to them, the EVA material so retains heat well.
  2. Shock absorbing properties. bends and does not break, does not lose flexibility and elasticity in low temperatures, down to -60 degrees Celsius.
  3. Resistance to oils and solvents. This allows us not to be afraid of the fishermen to be without shoes during refueling of the snowmobile or, for example, if you buy gasoline in the gas tank when fishing in spring or autumn in a motor boat.
  4. Light weight. Shoes the EVA is almost 4 times lighter than similar boots from PVC, and almost 6 times lighter than the same boots from the cast of thermoresin. Can compare, for example, boots from EVA from the firm nazihah, producing for fishing, with the same boots from thermoresin — the difference is felt immediately.
  5. Water resistant. You can not be afraid that you will miss water. You can move through the water or slush on the ice without any fear.
But can't even be such a wonderful material only the pros. There are also disadvantages. They are the following:
  1. Weak puncture resistance. Because the EVA material is porous, it is easy to pierce. This means that such caution is needed to use, for example, when moving through the woods. For hunters, for example, special boots are made from EVA, reinforced and hardened, which allows not to be afraid of an accidental puncture by a twig.
  2. Inadequate anti-slip properties. Due to the fact that fishing shoes made of EVA is produced by forming in moulds, the surface of the boots is smooth. Including on the soles. Because of this, the EVA is quite "slippery", to move them on bare ice quite uncomfortable. Although lately the producers make the soles of boots over ribbed, which provides relative comfort on the ice.

The global market for EVA

The largest suppliers of vinyl acetate are ExxonMobil, Polimeri Europa Arkema, Repsol, DuPont (Elvax) иTotal.

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