Applications of Innospec Leuna FLEXAREN 09009 EVA in Industrial Manufacturing

Innospec Leuna FLEXAREN 09009 EVA supports manufacturers in multiple industrial markets with its high purity, controlled melt flow, and well-defined compatibility profile. The following application scenarios detail how leading downstream sectors integrate this ethylene-vinyl acetate copolymer into engineered formulations to achieve certified, consistent performance in finished goods.

1. Hot Melt Adhesives for Packaging Assembly

Corrugated container, paperboard sealing, and case/carton closure manufacturers rely on this raw material in hot melt adhesive compounding, where EVA’s controlled flexibility and adhesion properties provide strong bonding at high processing speeds. The product ensures repeatable wetting and tack across a range of board coatings and paper weights, allowing converters to maintain throughput and packaging integrity, even under varied line conditions.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for indirect food contact)
• REACH (EC No. 1907/2006) chemical registration and SVHC checks
• EN 13432 (Compostability standards where applied to packaging)
• BRCGS Packaging Materials Global Standard, Issue 6

Typical usage ratio

• 30–45% by weight within total adhesive formulation; final EVAc content varies with viscosity and open time requirements. Ratios adjust according to line speed and substrate absorbency, from 28% for sealed corrugate to 48% in fast-set applications.

Downstream process integration

• Dosed directly during hot melt batch blending, following resin and wax addition; the material is blended in heated process kettles under agitation until homogeneous with tackifiers and plasticizers before pelletizing or direct fill into sticks/slugs.

Final product types

• Hot melt glue sticks for industrial and manual application
• Block adhesives for automated case/form fill/seal machines
• Pressure-sensitive packaging tapes
• Bottle labeling adhesives for glass and PET lines

2. Solar Photovoltaic Module Encapsulation

Solar module manufacturers require precise encapsulation layers to protect photovoltaic cells from moisture ingress and mechanical stress. EVA with a specified vinyl acetate content and high melt index guarantees uniform lamination and reliable cross-linking kinetics in sheet extrusion and calendaring lines, supporting high optical transmission and long-term UV stability essential for module durability.

Industry compliance standards

• IEC 61215 (Crystalline silicon terrestrial PV modules)
• UL 1703 (Flat-plate PV modules and panels, North America)
• RoHS 2011/65/EU (Restriction of Hazardous Substances)
• ISO 9001:2015 (Quality management during encapsulant compounding)

Typical usage ratio

• Main encapsulant layer: 1.6–2.0 kg per m² panel, translating to 95–100% of layer mass; filling level for cell encapsulant maintained at 400–500 µm thickness post-lamination. Modifiers, antioxidants, and cross-linkers comprise minor constituents (1–4%).

Downstream process integration

• Fed to twin-screw extruders or sheet calendar lines; processed at 140–160°C with online thickness and uniformity monitoring, followed by lamination under moderate vacuum. Cross-linking agents enter at melt mixing stage immediately before sheet extrusion.

Final product types

• PVC-free solar panel encapsulant sheets
• Multi-layered photovoltaic back-membrane composites
• Flexible PV module film interlayers
• Module edge seal tapes (EVA as carrier film)

3. Footwear Soling and Injection-Molded Shoe Components

Shoe sole and molded midsole manufacturers select this EVA for light density, fine-cell foam production, providing resilient cushioning while maintaining tear strength and dimensional stability. Consistent copolymer characteristics enable precise foaming and coloring, supporting both high-frequency injection and compression molding lines in athletic, work, and casual shoe manufacturing.

Industry compliance standards

• ISO 20871 (Footwear—Soles—Test methods for abrasion resistance)
• EN ISO 20347:2022 (Occupational footwear—safety, comfort, slip resistance)
• REACH Annex XVII (Phthalates, heavy metals restrictions)
• California Proposition 65 (Safe Materials Disclosure in footwear supply chains)

Typical usage ratio

• 55–80% EVA in foam compound for direct soling; high-support midsole blends use 40–60% with fillers, oils, and blowing agents. Density and hardness targets drive variation, with lower ratios for heavy-duty outsoles.

Downstream process integration

• EVA granules dry-blended with foaming agents, pigments, and other additives before feeding to injection or compression molding machines. Foaming and molding steps occur consecutively at 150–200°C under defined pressure cycles.

Final product types

• Midsoles for running and training shoes
• Outsoles for safety and work footwear
• Sock liners and insole boards
• Children’s casual shoe soles

4. Wire & Cable Insulation Compounds

High-voltage and low-voltage wire and cable producers benefit from EVA’s dielectric strength and flexibility, enabling stable insulation compounds that resist stress cracking and maintain pliability under repeated bending. Material purity and predictable melt behavior simplify pellet feeding and profile extrusion in automotive, building, and utility cable applications.

Industry compliance standards

• UL 1581 (Electrical wires, cables, and flexible cords—Reference standard)
• IEC 60227 (PVC insulated cables for rated voltages up to and including 450/750 V)
• RoHS Directive 2011/65/EU
• CSA C22.2 No. 49 (Flexible cords and cables, North America)

Typical usage ratio

• 35–65% by weight in insulation compound; blended with flame retardants, plasticizers, and process aids. Final composition depends on flame resistance, dielectric, and mechanical property targets.

Downstream process integration

• Batch pre-mixing with mineral or halogen-free flame retardants, followed by continuous compounding through twin-screw extruders. Direct extrusion coats conductors in a single operation or via secondary jacketing lines.

Final product types

• Building wire insulation for residential and commercial use
• Automotive primary wire jackets
• Flexible appliance cords
• HFFR (Halogen-Free Flame Retardant) cable sheathing

5. Flexible Film and Sheet for Industrial and Agricultural Uses

Film converters utilize EVA in both blown and cast film lines for manufacturing stretch wraps, silage and bale coverings, and specialty packaging film. Its copolymer structure offers impact resistance, puncture tolerance, and low-temperature sealability, which are critical for agricultural applications exposed to fluctuating outdoor conditions and high-speed packing machinery.

Industry compliance standards

• EU Regulation No 10/2011 (Plastics intended to come into contact with food, for food packaging films)
• ASTM D882 (Tensile properties of thin plastic sheeting)
• ISO 18604 (Material recycling of plastics—Principles of recovery and recycling)
• ISO 9001:2015 (Production management in film manufacturing)

Typical usage ratio

• 10–35% by weight in film blend; lower levels in multi-layer food packaging co-extrusion, higher in stretch agricultural films seeking elasticity. Adjusted according to required tear resistance and final gauge.

Downstream process integration

• Fed to blown film or cast film extruders along with LDPE, HDPE, and specific functionalizing additives; compounded at 160–190°C with on-line thickness and clarity controls. Co-extruded as outer, core, or sealant layers per film structure.

Final product types

• Silage wraps and bale films
• Printed shrink sleeve labels
• Heat seal layer in multi-layer food packaging
• Protective and masking films for building/construction