Applications of Levima UL2806 EVA in Industrial Manufacturing

Levima UL2806 EVA (Ethylene-Vinyl Acetate Copolymer) supports multiple high-value production processes across different sectors. As the direct manufacturer, we focus on real-world downstream integrations, ensuring consistent quality and compliance for demanding industrial needs.

1. Photovoltaic Encapsulation Films

Photovoltaic module manufacturers employ UL2806 EVA for encapsulation films, taking advantage of its balance of melt flow rate, low gel content, and resistance to yellowing under UV exposure. Using this grade improves lamination process stability and guarantees durable adhesion to solar cells and front/rear sheets. Its compatibility with crosslinking agents during film extrusion supports strict reliability and optical clarity requirements throughout the lifecycle of solar modules.

Industry compliance standards

• IEC 61215:2016 Photovoltaic (PV) Module Qualification
• UL 1703 Standard for Flat-Plate Photovoltaic Modules
• RoHS Directive (EU) 2011/65/EU
• Restriction of PAH based on REACH Annex XVII

Typical usage ratio

• Used as the primary resin: 93%–97% of encapsulant film by weight, with the remainder being crosslinkers, UV stabilizers, and antioxidants. Ratio adjusted for lamination thickness and cell encapsulation efficiency.

Downstream process integration

• Direct extrusion of compound EVA pellets into masterbatch, melt blown, then cast into sheet-form encapsulant films before module lamination steps.

Final product types

• Monofacial and bifacial crystalline silicon PV panels
• Thin-film photovoltaic modules
• Building-integrated photovoltaic glass units

2. Hot Melt Adhesives for Hygiene & Packaging

In hot melt adhesive formulation for hygiene (e.g., baby diapers, sanitary napkins) and packaging applications, UL2806 EVA enables precisely engineered melt viscosity, strong initial tack, and resilient peel strength. The material’s low gel level and high vinyl acetate content make it instrumental for thermoplastic adhesive blending with tackifiers and waxes during pellet compounding and drum filling. Strict migration and extractable content quality testing is upheld for direct contact articles.

Industry compliance standards

• US FDA 21 CFR 175.105 (Adhesives for food contact)
• ISO 10993-5 Biocompatibility for hygiene articles
• Regulation (EC) No 1935/2004 (Food Contact Materials)
• GB/T 2793-2011 (Polymeric Adhesive - General)

Typical usage ratio

• 35%–48% polymer base in hot-melt adhesive formulations, balanced with tackifiers, plasticizers, and microcrystalline wax. Level varies based on flow performance and peel requirements for intended substrate.

Downstream process integration

• EVA granules dry-blended with ingredients in jacketed mixers, pelletized, and then extruded or applied by slot-die or bead application to backsheet, tissue or non-woven substrates.

Final product types

• Disposable baby diapers and adult incontinence pads
• Packaging case sealants and carton closing adhesives
• Feminine hygiene napkins and medical backsheet adhesives

3. Cable and Wire Insulation Compounds

Wire and cable compounders specify UL2806 EVA for low voltage cable sheathing and insulation, where its electrical resistivity, flexibility at low temperatures, and ease of crosslinking are required. The resin demonstrates compatible compounding with flame retardants, carbon black, and anti-oxidants, with physical and flame barrier characteristics tailored for power cable insulation and communication wire jacketing. Processing conditions focus on pellet homogeneity and extrusion throughput.

Industry compliance standards

• IEC 60502-1 for power cables (1 kV to 3 kV)
• UL 1581 (Reference Standard for Electrical Wires, Cables, and Flexible Cords)
• RoHS 2011/65/EU (for low halogen content)
• GB/T 2951-2008 (Polymeric Insulation & Sheath of Cables)

Typical usage ratio

• 40%–75% EVA resin in the base compound, adjusted for flame retardant and filler content. The ratio is determined by voltage rating and required flexibility.

Downstream process integration

• Batch mixing with fillers and additives, followed by extrusion as insulation over conductor cores or as the sheath layer in continuous cable sheathing lines.

Final product types

• Building wire and control cable sheaths
• Automotive low voltage wiring
• Flexible data and signal cable insulation

4. Foamed Shoe Soling and Athletic Footwear

Manufacturers adopt UL2806 EVA in footwear systems, particularly for midsole and outsole foam. Its vinyl acetate content enhances abrasion resistance, energy return, and cushioning. After pellet blending with crosslinking and nucleating agents, industrial-scale injection or compression molding follows, creating lightweight and shock-absorbent soles for performance sports and leisure footwear, while ensuring compliance for phthalate and heavy metal-free material standards.

Industry compliance standards

• GB 30585-2014 (Footwear Safety Technical Specification)
• EN ISO 20344/20347:2012 (Test methods for footwear)
• REACH Regulation (EC) No 1907/2006 (Annex XVII restricted substances)
• CPSIA (US Consumer Product Safety for lead and phthalates)

Typical usage ratio

• 60%–85% of foamed sole formulation by weight; recipe optimized for part hardness and expansion ratio per end shoe design.

Downstream process integration

• Compounding and pelletizing with foaming, crosslinking, and coloring agents, followed by injection or compression molding into sole configurations with in-mold curing.

Final product types

• Running, tennis, and basketball shoe midsoles
• Casual and leisure shoes outsoles
• Protective and non-slip industrial footwear base parts

5. Film-grade Packaging for Food & Medical Use

Extrusion film converters utilize UL2806 EVA to manufacture flexible packaging films that require substantial puncture resistance, cold sealability, and transparency. The grade allows for heat sealing at lower temperatures and supports coextrusion with polyolefins to achieve applications in perishable food, medical device overwrap, and deep-freeze food bag segments—all subject to direct contact and low-migration stipulations.

Industry compliance standards

• US FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers for food contact)
• EU Regulation (EU) No 10/2011 (Plastic Food Contact Materials)
• EN 11607-1:2006 (Packaging for Terminally Sterilized Medical Devices)
• GB 9685-2016 (China Food Contact Additives Positive List)

Typical usage ratio

• 10%–35% in blend films, adjusted based on cling, transparency, and sealing performance needed for the packaged item.

Downstream process integration

• Blending as a component in the extruder feedstock before multi-layer film blowing or cast film extrusion, prior to downstream printing or lamination.

Final product types

• Meat, cheese, and dairy packaging films
• Frozen food pouches and deep-freeze bags
• Medical device overwrap films and diagnostic test strip packaging

6. Solar Backsheet Composite Layer

EVA’s high dielectric strength and adhesion properties make it the preferred tie layer in solar backsheet composites. UL2806 is introduced between the PET core and the outer weather-resistant layers by film extrusion and lamination. Its performance resists delamination during 85°C/85%RH aging tests and boosts the long-term reliability and insulation of photovoltaic installations.

Industry compliance standards

• IEC 61730 (Photovoltaic Module Safety Qualification)
• TÜV Rheinland 2 PfG 1169/10.07 (Backsheet quality assessment)
• UL 746C (Polymeric Materials – Use in Electrical Equipment Evaluations)
• RoHS/REACH substance restrictions

Typical usage ratio

• 18%–26% of the composite layer stack, determined by required adhesion and electric breakdown voltage. Variation driven by PET core thickness and external layer grade.

Downstream process integration

• Co-extrusion or lamination onto PET substrate, then thermal calendaring and backsheet final processing before module assembly.

Final product types

• PET/EVA/fluoropolymer solar backsheets
• Double-glass PV modules with EVA intermediate layer