Applications of Jiangsu Hongjing V2825 EVA in Industrial Manufacturing

Jiangsu Hongjing V2825 EVA serves as a core ethylene-vinyl acetate copolymer in several high-value manufacturing sectors. Our resin is produced under strict process controls to ensure consistent melt flow and VA content, supporting stable downstream performance. Below we present specialized applications proven by industry customers in major verticals, with real process details and standards.

1. Photovoltaic Encapsulants for Solar Modules

Leading solar module manufacturers utilize this EVA grade as the primary encapsulant resin, favored for its balanced melt index and reliable cross-linking in lamination. Incorporation typically occurs after compounding with crosslinking agents and UV stabilizers before sheet extrusion, helping to secure and insulate sensitive silicon cells through varying climatic exposures. Formulation adapts to local regulatory mandates and cell design, ensuring stable light transmission and mechanical protection through years of module operation, even in high-UV or humid environments.

Industry compliance standards

• IEC 61215: Photovoltaic module qualification
• UL 1703: Flat-Plate Photovoltaic Modules and Panels
• RoHS Directive 2011/65/EU (lead and hazardous substance limits)
• REACH (EC 1907/2006) registration compliance

Typical usage ratio

• 90% – 97% in encapsulant sheet formulations; adjusted to accommodate specific cell technology and desired lamination performance

Downstream process integration

• Initial dosing in twin screw extruder along with curing agents, antioxidants, and UV absorbers
• Extruded into sheet, then laminated between glass and cell layers during module assembly

Final product types

• Crystalline silicon photovoltaic modules
• Thin-film solar modules
• Bifacial modules with high transparency requirements

2. Footwear Injection and Compression Midsoles

Global footwear producers employ this EVA resin for midsoles and outsole foams, supporting consistent cell structure and resilience after molding. The VA content and melt stability permit detailed adjustment during injection or compression-molding with blowing agents, fillers, and pigment dispersions. Custom compounding sets hardness, rebound, and density, with traceability managed under strict in-house QA and relevant international footwear standards.

Industry compliance standards

• EN ISO 20871: Footwear assembly adhesive bonding
• ISO 20344: Personal protective equipment—testing methods for footwear
• REACH Annex XVII (regulation of plasticizers and additives)

Typical usage ratio

• 60% – 95% of midsole/outsole compound; ratio tuned based on required hardness and mechanical flexibility for adult or children's shoes

Downstream process integration

• Dry blending with foaming agents, process oils, color masterbatches
• Injection/process molding following compounding, with post-mold cooling for dimensional stability

Final product types

• Sports shoe midsoles
• Children’s EVA sandals
• Work boot shock-absorbing inserts

3. Hot Melt Adhesives Manufacturing

OEMs and adhesive formulators rely on this EVA as a primary polymer base in hot melt adhesive (HMA) sticks, granules, and films. The grade’s controlled melt flow supports quick setting, compatibility with tackifiers and waxes, and strong bonding to substrates from packaging board to non-woven textiles. Compounders optimize blend ratios for adhesion, flexibility at application temperature, and resistance to thermal cycling in packing or assembly lines.

Industry compliance standards

• FDA 21 CFR 175.105 (adhesives in indirect food contact applications, USA)
• EN 923: Adhesives—terms and definitions (Europe)
• ISO 9001:2015-certified adhesive plants

Typical usage ratio

• 35% – 55% of total HMA formulation; levels refined to achieve required open time, bond strength, and viscosity for target application

Downstream process integration

• Fed into compounder with tackifying resins, waxes, antioxidants
• Extruded and pelletized or directly formed into hot melt sticks or films

Final product types

• Case and carton sealing adhesives
• Bookbinding spines
• Non-woven hygiene product assembly adhesives

4. Wire & Cable Insulation Compounds

Wire and cable manufacturers incorporate this EVA copolymer as an essential matrix in flexible, halogen-free, flame-retardant insulation sheaths. Typical compounding features high mineral filler loadings and flame retardants, with EVA selected for electrical resistance and elongation. The production process demands melt blending under controlled shear, ensuring full dispersion and preventing fouling or gel formation. Insulation properties persist after extrusion and crosslinking for safe, reliable cable performance.

Industry compliance standards

• IEC 60502-1: Power cables with extruded insulation
• EN 50268: Common test methods for cables
• UL 2556: Standard for wire and cable test methods
• RoHS compliance for restricted hazardous substances

Typical usage ratio

• 25% – 60% in cable compound by weight; levels reduced when increasing mineral fire retardancy or designing for highly flexible insulation requirements

Downstream process integration

• Direct addition to internal mixer or extruder with ATH, fillers, antioxidants
• Continuous extrusion onto conductor core, followed by water bath or crosslinking treatment

Final product types

• Halogen-free flame-retardant cables
• Instrument and control wiring insulation
• Low-smoke, low-toxicity electrical sheaths

5. Foam Packaging and Protective Inserts

Leading packaging converters use this ethylene-vinyl acetate for molded foam sheet and block production, valued for its processing characteristics and cushioning reliability at low densities. The resin accepts additive blending for impact, antistatic, or coloration requirements, and can be adapted by adjusting cell nucleators or blowing agent levels. Close control at the batch extrusion and molding stage preserves cell structure, vital for packaging precision machinery, medical devices, and shock-sensitive electronics.

Industry compliance standards

• REACH (EC 1907/2006), SVHC compliance
• EN 13427: Packaging – Standards for environmental impact
• RoHS (Restriction of Hazardous Substances) for electronics packaging

Typical usage ratio

• 60% – 95% in foam matrix formulations; proportion reduced when using recycled content or high anti-static additive loading

Downstream process integration

• Premixed with blowing agents and functional additives
• Foamed by extrusion or batch molding, then water-cooled and cut to dimensional requirements

Final product types

• Protective packaging inserts
• Custom-fit foam trays for electronics
• Shock-absorbing medical device pads