Ethylene-vinyl Acetate Copolymer (EVA)

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Product Descriptions：

Ethylene-vinyl acetate copolymer (EVA), generally the content of vinyl acetate (VA) is 5% to 40%.Compared with polyeth

ylene, EVA introduces vinyl acetate monomer into the molecular chain, thereby reducing crystallinity, improving flexibility,

impact resistance, filler compatibility and heat sealing performance. These characteristics make EVA widely used in foam shoe

materials, functional shed films, packaging films, hot melt adhesives, wires and cables, toys and other fields. In general, the per

formance of EVA resins is mainly determined by the amount of vinyl acetate on the chain. EVA has good low temperature resis

tance, and its thermal decomposition temperature is about 230℃. As the molecular weight increases, the softening point of EVA

increases, and the processability and surface gloss decrease. However, with the increase of strength, the impact toughness and

environmental stress cracking resistance are improved. The chemical and oil resistance of EVA is slightly worse than that of PE

and PVC, and the difference is more obvious with the increase of the content of vinyl acetate. EVA has better performance than

LDPE in terms of elasticity, flexibility, gloss, and air permeability. In addition, its resistance to environmental stress cracking has

been improved, and its compatibility with fillers has increased. Therefore, the method of adding more reinforcing fillers can be

used to avoid or reduce the poor mechanical properties of EVA. Its modification can be considered from two aspects: one is to

use EVA as the backbone for grafting other monomers; the other is to conduct partial alcoholysis of EVA.

Product Quality Performance：

It has good softness, rubber-like elasticity, and still has good flexibility at -50 ° C. Good transparency and surface gloss,

good chemical stability, good anti-aging and ozone resistance, and non-toxic. The filler has good blending properties, good

coloring and molding processability. Odor-free, biodegradable: no harm to the environment when discarded or burned.

(1) Lighter weight: The density of EVA is between 0.915 ～ 0.955g/cm³.

(2) Metal-free: in line with relevant international toy regulations (EN-71 Part3 and ASTM-F963).

(3) Phthalates-free: suitable for children’s toys (no risk of plasticizer release), and its high transparency, softness and toughness

characteristics have a wide range of applications.

(4) Super low temperature resistance (-70℃): suitable for freezing environment.

(5) Resistant to water, salt and other substances: it can maintain stability in most applications.

(6) High thermal adhesion: it can be firmly adhered to nylon, polyester, canvas and other cloth.

(7) Low bonding temperature: can speed up the production speed.

(8) Screen printing and offset printing: can be used for multi-pattern products (but must use EVA ink).

Main Application：

(1) Photovoltaic film：VA content is 26%-30%. Photovoltaic cell encapsulation film (EVA) is a thermosetting adhesive film

that is used in the middle of laminated glass. The superiority of EVA film in terms of adhesion, durability, optical properties, etc.,

which makes it more and more widely used in photovoltaic film current components and various optical products.

(2) Foam shoe material：VA content is 15%-22%. Due to EVA resin blended foam products have the properties of softness,

good elasticity, and chemical resistance, they are widely used in the soles and interior materials of middle and high-end tourist

shoes, hiking shoes, slippers, and sandals. In addition,it is also used in the fields of sound insulation boards, gymnastics mats

and sealing materials.

(3) Wire and cable：VA content is 12%-30%. EVA resin is widely used in halogen-free flame-retardant cables, semiconductor

shielded cables and two-step silane crosslinked cables due to its filler tolerance and crosslinkability.

(4) Hot melt adhesive：VA content is generally more than 30%. The hot melt adhesive with EVA resin as the main component

does not contain solvents, does not pollute the environment and has high safety, which is eminently suitable for automated

assembly line production. Therefore, it is widely used in book wireless binding, furniture edge banding, automobile and house

hold appliances assembly, shoe-making, carpet coating and metal anti-corrosion coating。

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