Applications of Hanwha TotalEnergies 1157 EVA in Industrial Manufacturing

Hanwha TotalEnergies 1157 EVA (Ethylene Vinyl Acetate Copolymer) is valued by manufacturers for its processability and specific vinyl acetate content. The following application breakdown covers core industrial sectors that implement this raw material in controlled processes, focusing on regulatory adherence, blending ratios, process steps, and resultant industrial goods.

1. Photovoltaic Module Encapsulation

Leading solar panel producers use 1157 EVA as an encapsulant resin in the lamination of photovoltaic modules. Its specific vinyl acetate content provides flexibility, strong adhesion, and high transparency, protecting solar cells from moisture and UV degradation. The material undergoes crosslinking during lamination at elevated temperatures to achieve the desired physical and optical properties, ensuring the panels’ long-term performance.

Industry compliance standards

• IEC 61215, IEC 61730 (PV module qualification and safety)
• UL 1703 (Flat-plate PV module certification)
• RoHS Directive 2011/65/EU (Restriction of Hazardous Substances)
• REACH Regulation (EC) No 1907/2006

Typical usage ratio

• Module encapsulant layer: 250–400 g/m², typically 16–33% by weight of the module’s non-glass components.
• Ratio can adjust based on cell type and thickness specifications.

Downstream process integration

• Compounding and pelletizing for extrusion or calendering.
• Sheets formed and trimmed, then laminated with cells at 140–155°C under vacuum.
• Post-lamination crosslinking for enhanced weather resistance.

Final product types

• Crystalline silicon solar panels
• Thin-film photovoltaic modules
• Bifacial PV panels
• Building-integrated photovoltaic panels (BIPV)

2. Wire & Cable Insulation and Sheathing

Producers in the wire and cable industry select 1157 EVA for insulation and sheathing where enhanced flexibility, low-temperature performance, and resistance to environmental stress cracking are essential. Formulators blend the resin with antioxidants, flame retardants, and fillers, then process it by extrusion onto conductor wires. Compound formulation must comply with stringent electrical and fire safety regulations, and customers specify grades for voltage and exposure requirements.

Industry compliance standards

• IEC 60228 (Conductors of insulated cables)
• UL 1581 (Reference for electrical wires, cables, and flexible cords)
• EN 50363-4-1 (EVA-based insulation compounds requirements)
• RoHS Directive 2011/65/EU

Typical usage ratio

• Base resin typically 50–80% of the insulation compound by weight.
• Formulation adjustment for flame retardancy, mechanical strength, and processing speed.

Downstream process integration

• Dry blending EVA pellets with specific additives.
• Feeding blends into twin-screw extruders for strand compounding.
• On-line extrusion onto copper or aluminum conductors; cooling and surface finishing follow.

Final product types

• Building and industrial wiring cables
• Home appliance cords
• Automotive battery and control wires
• Low- and medium-voltage power cables

3. Hot Melt Adhesives Manufacturing

Hot melt adhesive producers employ 1157 EVA for packaging, woodworking, hygiene, and laminate applications. The material’s specific melt index and vinyl acetate level influence open time, setting speed, and adhesion to substrates. Formulators combine the resin with tackifiers, waxes, and stabilizers, tuning compositions according to end-use temperature and bonding demands. The polymer’s compatibility with multiple classes of tackifiers enables product designers to optimize glue lines for target substrates without compromising regulatory conformance.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for food packaging, US)
• EU Regulation 10/2011 (Plastic materials in contact with food, EU)
• ASTM D4497 (Standard for Hot Melt Adhesives)
• ISO 9001:2015 (Quality management systems in adhesive manufacturing)

Typical usage ratio

• Base polymer content: 25–45% by weight in standard hot melt formulations.
• Adjustable according to required open time and application environment.

Downstream process integration

• Melting and homogeneous mixing in reactors with additive dosing.
• Continuous extrusion, pelletizing, or block molding for cool-down and packaging.
• Direct integration into hot melt applicator systems or film coating lines.

Final product types

• Carton and case sealing adhesives
• Bookbinding glues
• Disposable hygiene product adhesives (e.g., diaper construction)
• Furniture assembly adhesives

4. Foam and Footwear Injection Molding

Shoe manufacturers, as well as technical foam fabricators, utilize 1157 EVA in closed-cell and microcellular foam products. Its flexibility, cushioning, and moldability allow for direct injection molding or sheet foaming with precise control over expansion rate and density. The formulation process involves blending with blowing agents, crosslinking promoters, pigments, and other polymers as needed for footwear soles or sport mat production.

Industry compliance standards

• ISO 20344, ISO 20345 (Performance and safety of protective footwear)
• REACH Regulation (SVHC and phthalate restrictions)
• GB/T 3903.1 (Chinese Standard for Test Methods on Footwear)
• ISO 9001:2015 (Manufacturing quality standards)

Typical usage ratio

• Foaming compositions: 55–85% EVA by weight, based on product density and hardness requirements.
• Ratio adapts to shore hardness and cell structure targets in athletic or casual soles.

Downstream process integration

• Dry blending of EVA with additives and masterbatches.
• Compounding via twin-screw extrusion or direct mixing with blowing agents.
• Injection molding or sheet foaming at 180–210°C, followed by cooling and cell stabilization.

Final product types

• Shoe midsoles for running and walking footwear
• Slip-resistant and lightweight outsole components
• EVA foam mats for sports and education
• Protective footwear for industrial applications

5. Flexible Film Production for Packaging

Film manufacturers select 1157 EVA to fabricate flexible film structures for food wraps, greenhouse films, and industrial bags. The resin provides clarity, puncture resistance, and enhanced sealability. Extrusion casting or blown film lines incorporate this EVA as a co-extrusion layer or blend, often in combination with LDPE or LLDPE. Regulatory conformance for direct and indirect food contact is necessary, requiring documentation and monitoring of formulation ingredients.

Industry compliance standards

• FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers, food contact, US)
• EU Regulation 10/2011 and Framework Regulation (EC) No 1935/2004
• EN 1186 (Food simulant testing for polymer films)
• ISO 22000 (Food safety management in packaging plants)

Typical usage ratio

• Blend ratio: 10–35% EVA in multilayer structures for enhanced flexibility and sealing.
• Can increase to 50% for selected shrink and stretch films.

Downstream process integration

• Gravimetric dosing of polymer pellets and masterbatches in film extrusion lines.
• Co-extruding as core or outer layer with LDPE/LLDPE.
• Blown film cooling and surface treatment prior to slitting and winding.

Final product types

• Food and stretch wrap films
• Greenhouse and agricultural films
• Industrial liners and dust covers
• Vacuum packaging base films