Applications of Tosoh Nipoflex 634 EVA in Industrial Manufacturing

Tosoh Nipoflex 634 EVA is a high-performance ethylene-vinyl acetate copolymer widely processed in advanced manufacturing sectors. As an original manufacturer, we serve key downstream converters optimizing their technical formulations for performance, safety, and compliance in demanding end-use markets. Below are focused industrial segments adopting this grade in specialized plant operations.

1. Solar Photovoltaic (PV) Encapsulants

EVA resin serves as the primary encapsulation material for manufacturing solar cell modules, where it binds, insulates, and protects photovoltaic cells from moisture, UV exposure, and mechanical stress. Producers require this raw material for its high transparency, precise melt flow, controlled crosslinking and processing uniformity. They blend the EVA with curing additives and UV stabilizers before laminating under heat and vacuum, ensuring high module efficiency and durability over 25+ year service lives.

Industry compliance standards

• IEC 61215 (Crystalline Silicon Terrestrial PV Modules)
• IEC 61730 (PV Module Safety Qualification)
• UL 1703 (Standard for Flat-Plate PV Modules)
• RoHS Directive (EU 2011/65/EU)

Typical usage ratio

• 70–95% by weight in the encapsulant film, adjusted for additive, crosslinker content, and film thickness requirements.

Downstream process integration

• EVA pellets are compounded with peroxide crosslinkers and stabilizers, then extruded or cast into films (0.4–0.6 mm thick).
• Films are layered in module lamination lines—hot pressing at 140–150°C ensures uniform encapsulation around cells and busbars.

Final product types

• Photovoltaic solar modules (mono- and polycrystalline)
• Building-integrated PV panels
• Flexible PV sheets

2. Hot Melt Adhesives for Packaging

This EVA copolymer forms the structural resin matrix in high-speed hot melt adhesive sticks and bulk adhesives used in automated packaging lines. Producers value its controlled viscosity, bond flexibility, and compatibility with tackifiers and plasticizers. It enables fast wetting and secure adhesion on various substrates, especially corrugated cartons, paper, and certain plastics. The adhesive achieves required bond strengths while maintaining package integrity under stress and temperature fluctuations during logistics.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for Food Packaging Indirect Contact)
• EN 923/EN 13999 (European Adhesives Terminology & Testing)
• ISO 9001:2015 (Quality Management in Manufacturing)

Typical usage ratio

• 18–40% EVA in final adhesive formulation; adjusted with waxes, resins, and additives based on desired open time, set time, and substrate.

Downstream process integration

• Pellets are melted and mixed with tackifiers and plasticizers under controlled agitation, then formulated into hot melt blocks or granules.
• Converted into hot melt sticks or pillow forms for use in high-speed dispensing equipment in packaging plants.

Final product types

• Hot melt glue sticks for auto carton sealing
• Bulk hot melt adhesives for case and tray erecting
• Multipurpose product packaging adhesives

3. Wire and Cable Insulation and Sheathing

EVA-based compounds produce flexible, flame-retardant insulation and jacketing for low- and medium-voltage power cables, data cables, and automotive wiring harnesses. Processors choose this material for its consistent melt strength, electrical insulation properties, and cleanliness in extrusion. It blends well with inorganic flame retardants without compromising surface finish or dielectric stability. Processed resin offers reliable performance for cables requiring mechanical flexibility and weather resistance.

Industry compliance standards

• UL 1581 (Electrical Wires and Cables)
• IEC 60811 (Cable Insulation and Sheathing Materials)
• RoHS/REACH (Hazardous Substance Regulations)
• ISO/TS 16949 (Automotive Cable Manufacturing)

Typical usage ratio

• 25–65% by weight in compound, adjusted with flame retardants (e.g., ATH), plasticizers, and stabilizers for target flame rating or mechanical properties.

Downstream process integration

• Raw resin is dry-blended with flame retardant powders, then melt-compounded in twin-screw extruders.
• Compound extruded over metal conductors as insulation or outer jackets, followed by in-line cooling and post-extrusion surface treatment if required.

Final product types

• Automotive primary wire insulation
• Flexible power/industrial cables
• Low-voltage communication and signal cables

4. Foam Products for Sports and Footwear

EVA resin acts as the principal foaming base for injection- and compression-molded midsoles, insole inserts, anti-fatigue mats, and protective pads in the sports goods sector. Blending with specialized blowing agents and crosslinking systems, processors create lightweight, resilient, and shock-absorbing foams. These foams maintain dimensional stability and cushioning under repeated use, vital for athletic footwear, yoga mats, and sports gear padding.

Industry compliance standards

• EN 20347/ISO 20344 (Footwear Industry Testing)
• GB/T 3903.1-2008 (Sports Footwear - Physical Testing in China)
• REACH (Annex XVII Restrictions for Footwear Materials)

Typical usage ratio

• 55–90% EVA in primary foam batch, foaming agents at 1–4%, crosslinkers and color masterbatch as needed for design and density.

Downstream process integration

• Resin mixed in batch kneaders with blowing agents and additives, followed by extrusion or molding with controlled heating and foaming action.
• Final foam blocks are cut, skived, or compression-molded into shoe midsoles, inserts, or mat formats.

Final product types

• Athletic and casual shoe midsoles
• Yoga and sports mats
• Protective foam pads and liners

5. Flexible Film and Sheet for Industrial Packaging

Industrial converters utilize EVA resins to manufacture coextruded and monolayer films for protective packaging, lamination, and stretch/shrink wraps. These films deliver high puncture resistance, clarity, and sealability, meeting the needs of automated bagging, shrink wrapping, and industrial product protection. The resin is particularly used for custom-gauge films that require both elasticity and toughness in logistics handling or industrial storage.

Industry compliance standards

• EN 13427 (Packaging and the Environment)
• FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers for Food Contact Film)
• ISO 527-1 (Plastics – Tensile Properties)

Typical usage ratio

• 20–75% by weight in film blends; higher ratios for stretch/deep draw applications, lower for barrier or reinforced films.

Downstream process integration

• Material is dry-blended with LLDPE/LDPE or custom modifiers, then processed by blown or cast film extrusion equipment.
• Films coextruded in multilayer lines for specific barrier or mechanical requirements, followed by slitting and bag conversion as needed.

Final product types

• Shrink films for large industrial pallets
• Flexible protective wrap films
• Food contact packaging film

6. Medical Device Molding and Pharmaceutical Packaging

EVA copolymer is incorporated into select pharmaceutical blister packs, IV fluid bags, tubing, and medical device housings where flexibility, chemical resistance, and low extractables are essential. Medical processors employ this material in sensitive applications requiring precise control over transparency, aging, and sterilization performance. Careful attention to resin purity and traceability is demanded throughout the medical supply chain.

Industry compliance standards

• ISO 10993 (Biological Evaluation of Medical Devices)
• USP Class VI (United States Pharmacopeia Biological Reactivity)
• 21 CFR 177.1350 (FDA indirect food additive regulation)
• EN ISO 11607 (Packaging for Terminally Sterilized Medical Devices)

Typical usage ratio

• 55–100% in primary device components or flexible films; co-blended with specialty polymers for strength, if necessary.

Downstream process integration

• Pelletized resin directly extruded into sheet or tubes, or injection molded into device parts under GMP conditions.
• Quality control includes continuous monitoring for biocompatibility, extractables, and sterilization resistance.

Final product types

• IV solution bags and port seals
• Sterilizable medical tubing
• Pharma-grade blister packaging