Applications of Tosoh Nipoflex 722 EVA in Industrial Manufacturing

Tosoh Nipoflex 722 EVA is a high-performance ethylene-vinyl acetate copolymer designed for industrial usage across a select range of sectors. Below, we outline major downstream application fields with precise process details, compliance, and end-use specifications to support advanced manufacturing workflows.

1. Photovoltaic Encapsulant Film Production

Photovoltaic module manufacturers use this EVA for producing encapsulant films that protect solar cells from moisture and mechanical stress. Compounders blend the resin with cross-linking agents and UV stabilizers before extrusion and lamination. The material’s high clarity and reliability support demanding module performance requirements, directly impacting long-term solar yield and durability.

Industry compliance standards

• IEC 61215 (Crystalline silicon terrestrial photovoltaic modules—Design qualification and type approval)
• IEC 61730 (Photovoltaic module safety qualification)
• UL 1703 (Standard for Flat-Plate Photovoltaic Modules and Panels)
• RoHS and REACH (for hazardous substance control and traceability)

Typical usage ratio

• Encapsulant film layers contain 30–38 wt% EVA by total film mass, usually adjusted between 32–36% EVA based on panel specifications, with the remainder including additives and crosslinkers.

Downstream process integration

• Granulate supplied in pellet form, fed into twin-screw extruders for melt blending, followed by calendaring or cast film extrusion. Films proceed directly into module lamination lines under vacuum thermal cycles to achieve controlled cross-link density.

Final product types

• PVC-free encapsulant sheets for crystalline and thin-film PV modules
• Bifacial photovoltaic module films
• Backsheet and edge-seal materials for solar panels

2. Hot Melt Adhesive Formulation

Industrial adhesive compounders select this EVA copolymer as a primary base polymer owing to its flexibility, tack, and end-use safety. The raw material undergoes blending with other polymers, tackifiers, and stabilizers inside high-shear mixers to yield specific rheological and setting characteristics for packaging, woodworking, and bookbinding adhesives.

Industry compliance standards

• FDA CFR 21 175.105 (Adhesives—Indirect food contact)
• ISO 9001 (Quality management in adhesive production)
• GMP for adhesives in food packaging and labelling (EU Regulation No 2023/2006)
• ASTM D1876 (Peel resistance of adhesives)

Typical usage ratio

• EVA comprises 25–55 wt% of the final hot-melt blend, formulated higher for packaging and lower for woodworking, with adjustment based on target viscosity and bond strength.

Downstream process integration

• Introduced as a primary matrix during compounding. The raw pellets are batch-mixed with waxes, resins, and plasticizers at 140–180°C, then pelletized or block-cast for shipment to adhesive converters or direct end-users.

Final product types

• Hot melt packaging adhesives for carton closing
• Wood bonding adhesives
• Pressure-sensitive adhesives for labels and tapes
• Bookbinding glues for automated production lines

3. Cable and Wire Insulation Compounds

Compounders in the wire and cable sector use this grade EVA to impart electrical insulation, flame retardancy, and processability. The material is melt-blended with inorganic fillers and synergists, custom-fitted to meet performance requirements for medium- and low-voltage electrical cable insulation and jacketing.

Industry compliance standards

• UL 1581 (Reference Standard for Electrical Wires, Cables, and Flexible Cords)
• IEC 60502 (Power cables with extruded insulation and their accessories)
• RoHS (Lead, cadmium, and heavy metals restrictions in cable materials)
• CSA C22.2 No. 75 (Thermoplastic-insulated wires and cables)

Typical usage ratio

• EVA constitutes 32–48 wt% in insulation and sheath compounds, with the balance consisting of flame retardants, fillers, and process aids; the ratio shifts depending on specific dielectric strength and flexibility targets.

Downstream process integration

• Pellets are incorporated into compounding extruders. Molten blend is extruded onto stranded copper or aluminum cores, then cooled and cross-linked or filled with flame retardants as needed before final coiling or cutting.

Final product types

• Halogen-free cable insulation for power and control cables
• Low-smoke, flame-retardant jacketing for data transmission cables
• Automotive and building wiring insulation

4. Footwear and Sports Equipment Foam

Manufacturers apply this resin in closed-cell foam blocks to deliver enhanced flexibility, cushioning, and durability for midsoles, insole components, and protective sports gear. The material is physically or chemically blown using foaming agents during molding or sheet extrusion. The produced foam maintains resilience under repeated compression cycles, ensuring consistent product quality in high-wear applications.

Industry compliance standards

• ISO 20344 (Footwear—Test methods for safety, protective and occupational footwear)
• REACH Annex XVII (Restrictions on certain dangerous substances in shoes and consumer goods)
• Phthalate-free requirements for children’s products (CPSIA in US, EN 71-3 in EU)
• ISO 9001 (Quality management in foam and sports equipment manufacturing)

Typical usage ratio

• EVA loading in foam blends ranges from 45–80 wt%, formulated higher for soft foam blocks and reduced for co-molded or double-density soles; exact ratio tailored to durometer and rebound properties specified by downstream brands.

Downstream process integration

• Supplied as resin pellets entering compounding units. The compounded material passes to injection or compression molders, often using nitrogen or chemical foaming agents. Cut, trimmed, and assembled as required before QC and distribution.

Final product types

• Cushioned midsoles for performance and lifestyle footwear
• EVA foam sandals and slippers
• Shock-absorbing pads in helmets and protective equipment
• Stadium or yoga mats produced via continuous sheet extrusion

5. Flexible Packaging Film Manufacturing

Film producers use this grade EVA as a modifier to adjust sealing temperature, impact strength, and cold-flex properties for co-extruded multilayer packaging films. Blends with LDPE, LLDPE, or other polyolefins deliver enhanced optical clarity and hermetic sealing required for food packaging, medical pouches, and specialty bags.

Industry compliance standards

• FDA CFR 21 177.1350 (Ethylene-vinyl acetate copolymers for food-contact films)
• EU Regulation (EU) No 10/2011 (Plastic food contact materials—migration limits)
• ISO 22000 (Food safety management system applied in packaging sites)
• GMP as per Regulation (EU) No 2023/2006 (Good manufacturing practices)

Typical usage ratio

• EVA content in multilayer films typically ranges from 8–22 wt%, varied according to end-user requirements for sealability, elasticity, and transparency within co-extrusion lines.

Downstream process integration

• Palletized resin enters co-rotational extruders with other base polymers. The melt-blended composition is cast or blown into film, with in-line gauges adjusting thickness and sealing performance during continuous production runs.

Final product types

• Easy-peel and heat-seal films for lidding, pouches, and dairy packaging
• Medical fluid and pharmaceutical pouch films
• Frozen food storage bags
• Vacuum packaging films for industrial and consumer markets

6. Injection Molding for Toys and Childcare Products

Our customers in the toy and childcare sector rely on this EVA resin for its non-toxic, phthalate-free, and flexible properties in injection molding applications. The resin produces resilient, chewable surfaces and soft parts that pass stringent safety and migration testing in compliance with global standards for children’s goods.

Industry compliance standards

• EN 71-3 (Safety of toys—migration of certain elements)
• CPSIA (Consumer Product Safety Improvement Act, U.S.—phthalate and lead content)
• ISO 8124 (Safety of toys—mechanical and physical properties)
• Japan Food Sanitation Act for food-contact toy parts

Typical usage ratio

• EVA loading for toy and baby product compounds commonly sits between 60–92 wt%, selected for surface softness and colorant compatibility; ratio fine-tuned to manufacturer durometer and safety demands.

Downstream process integration

• Material supplied as pellets, blended with compliant colorants and heat stabilizers, then processed through injection molding equipment. Molded parts are subjected to post-mold migration and durability testing prior to packaging and shipment.

Final product types

• Teething rings and baby rattles
• Educational soft building blocks
• Bathing and water play toys
• Chewable handles and grips for strollers and feeding utensils