Applications of USI Corporation UE612-04 EVA in Industrial Manufacturing

Our EVA grade UE612-04 serves as a critical raw material in multiple industrial sectors, supporting advanced material performance and production efficiency. Below you will find closely defined application scenarios and our proven experience integrating this EVA copolymer into diverse value chains.

1. Photovoltaic Encapsulant Films

UE612-04 EVA is widely used as the primary resin in the production of encapsulant films for photovoltaic modules. The ethylene-vinyl acetate copolymer acts as the encapsulation layer, providing adhesion between solar cells and glass, UV stability, and impact resistance. Formulators rely on precise vinyl acetate content for melt flow, thermal stability, and transparency required in mass lamination lines. Achieving consistent mechanical properties ensures module durability through 25+ years outdoor exposure.

Industry compliance standards

• IEC 61215: Terrestrial Photovoltaic (PV) Module Standards
• UL 1703: Standard for Flat-Plate Photovoltaic Modules and Panels
• IEC 62788-1-1: Test Procedures for Encapsulation Materials
• ISO 9001:2015 Quality Management for Film Manufacturing

Typical usage ratio

• Up to 95-98% EVA in encapsulant film formulation; remaining ratio includes crosslinking agents, UV absorbers, and process additives, tuned according to cell type and module architecture.

Downstream process integration

• Compounding and extrusion into film sheets
• Thermal lamination of films with cell and glass stack
• Post-lamination crosslinking and edge trimming prior to module framing

Final product types

• Crystalline silicon photovoltaic panels
• Thin-film solar modules
• Bifacial PV modules

2. Hot Melt Adhesives (HMA) for Packaging

UE612-04 plays a central role as a thermoplastic base resin in the formulation of hot melt adhesive pellets and sticks for industrial packaging lines. Its melt viscosity and adhesion performance are optimized for high-speed automatic carton sealing, label application, and case forming. Brand owners select this EVA grade for its clean machinability, controlled open time, and compatibility with various substrate coatings. Regulatory compliance for indirect food contact is closely monitored in the packaging sector.

Industry compliance standards

• FDA 21 CFR 175.105 for Indirect Food Contact Adhesives
• REACH Regulation EC No 1907/2006 (SVHC restrictions)
• EN 923: Adhesives – Terms and Definitions
• ISO 14001: Environmental Management for Adhesives Manufacturing

Typical usage ratio

• 60-80% EVA by weight in hot melt adhesive formulations, adjusted based on cohesion/tack requirements, and blend ratios with waxes, tackifiers, and antioxidant packages.

Downstream process integration

• Extrusion compounding of solid adhesive base
• Pelletizing or stick forming for HMA supply
• End-user in-line melting and automatic application

Final product types

• Case and carton sealing adhesives
• Labeling hot melts
• Multiwall bag closure adhesives

3. Cable Insulation and Sheathing Compounds

Our EVA is a primary polymeric component in low voltage cable insulation and sheathing formulations. Manufacturers select this raw material for its predictable dielectric properties, flexibility, and flame retardance after compounding. The formulation allows adaptation to both halogen-free flame-retardant (HFFR) and standard grades for building wires, appliance cords, and data cables. Precision during mixing and compounding is essential to meet electrical and safety performance mandates.

Industry compliance standards

• IEC 60502: Power Cable Construction Standards
• UL 62: Flexible Cords and Cables
• RoHS 2011/65/EU: Restriction of Hazardous Substances
• EN 50290-2-22: Cable Compounds Health & Safety

Typical usage ratio

• 40-60% EVA copolymer in insulation compounds; percentage varies by need for flame-retardant fillers and mechanical strength requirements dictated by application and cable thickness.

Downstream process integration

• Banbury/kneader mixing with inorganic fillers and flame retardants
• Extrusion onto wire conductor as insulation or sheath
• Continuous vulcanization or irradiation crosslinking as needed

Final product types

• HFFR building wire insulation
• Instrument and control cable sheaths
• Flexible appliance cords

4. Foam Injection Molding for Footwear Midsoles

UE612-04 is a proven base polymer for foam compounding in sports shoe and sandal midsoles. Our customers use this grade for its controlled cell structure, resilience, and cushioning. The combination of EVA with expanding agents, crosslinkers, and pigments is tuned to each brand’s required compression-set and rebound targets. Manufacturing integrates precise metering, closed-mold foaming, and multi-stage curing to ensure consistent product density and appearance.

Industry compliance standards

• GB/T 15115: EVA Foaming Materials Standard (China)
• ISO 9001:2015 for Footwear Production Lines
• OEKO-TEX Standard 100 (certification for safe chemical content in consumer footwear)

Typical usage ratio

• 45-85% EVA in the foamed compound, balanced with blowing agents, crosslinkers, and performance additives. Higher EVA content supports springback; lower range promotes cost efficiency and softer cushioning.

Downstream process integration

• Compounding of EVA with additives and blowing agents
• Injection molding into pre-heated steel/aluminum molds
• Molding and post-foaming under controlled pressure/temperature
• Finishing and CNC trimming for dimensional accuracy

Final product types

• Sports footwear midsoles
• Flip-flop sandal footbeds
• Work shoe comfort inserts

5. Flexible Film and Sheet for Stationery and Office Supplies

This EVA copolymer supports the manufacture of non-PVC, soft-touch films and sheets for the stationery sector. Producers favor this grade for its clarity, print adhesion, anti-block performance, and resistance to cold cracking. Precision in film extruding and blending with antistatic and anti-block agents assures performance for applications from document covers to book binding. High process stability aids downstream printing, embossing, and die-cutting operations.

Industry compliance standards

• EN 71-3: Safety for Toy and Stationery Materials
• REACH Regulation on Safe Chemical Composition
• ISO 12625-1: Testing Standards for Stationery Sheets

Typical usage ratio

• 65-98% EVA as base resin, variably combined with slip agents, UV stabilizers, and anti-block additives. The exact ratio depends on sheet gauge, transparency, and end-use handling requirements.

Downstream process integration

• Film blowing or sheet extrusion
• Calendering and anti-block treatment application
• Surface conditioning for offset or flexographic printing

Final product types

• Document file covers and sheet protectors
• Book binding films
• Index tabs and flexible labels