Applications of Ningxia Baofeng Energy 1703 EVA in Industrial Manufacturing

Ningxia Baofeng Energy 1703 EVA serves specific functions across key industrial segments. As an experienced producer, we supply to downstream partners who require consistent grade and defined technical behavior in their formulations and conversion processes. Below we detail the principal downstream sectors, regulatory systems, practical formulation data, critical process nodes, and major end uses for this material.

1. Solar Photovoltaic Encapsulation Films

1703 grade EVA is adopted by leading PV film manufacturers for module encapsulation. Formulators look for controlled melt flow indices and acetate content to match lamination and module cycling requirements. During the extrusion and crosslinking process, EVA acts as the primary encapsulant resin, ensuring module longevity and electrical insulation. Lamination lines set curing parameters to achieve crosslinking density as per IEC testing, supporting field performance up to 25 years. End product quality relies on precise resin ratios, mechanical properties, and optical clarity.

Industry compliance standards

• IEC 61215 and 61730 (PV module safety and performance)
• UL 1703 (Standard for Flat-Plate PV Modules)
• RoHS Directive 2011/65/EU
• ISO 9001/14001 for manufacturing control

Typical usage ratio

• Core encapsulant layer: 95–98% EVA (by film weight)
• Copolymers, UV absorbers, and curing agents: balance 2–5% total
• Formulation ratio adjusts for gel content, transmission, and module stack-up

Downstream process integration

• Direct extrusion into encapsulation films (thickness 0.4–0.6 mm)
• In-line crosslinking on lamination equipment at 140–160°C
• Lamination between glass and cell assembly before module framing

Final product types

• Monocrystalline and polycrystalline PV module encapsulation films
• High-transparency and UV-blocking sheet products
• Backsheet attached assemblies
• Double-glass photovoltaic panels

2. Hot Melt Adhesives for Packaging and Assembly

In the production of hot melt adhesives, EVA 1703 establishes flexibility, adhesion, and thermal behavior necessary for carton sealing, bookbinding, and hygiene products. Formulators blend it with waxes, tackifiers, and stabilizers to tune open time, set time, and substrate compatibility. Manufacturing lines rely on regular pellet quality to minimize downtime and ensure consistent block or granule formation. The downstream process requires tight process windows for melting, blending, and application at 120–180°C, with line speed dictating viscosity and wetting parameters.

Industry compliance standards

• FDA 21 CFR 175.105 (adhesives indirect food contact in US)
• REACH Regulation (EC) No 1907/2006
• ISO 9001 for QC documentation in adhesive plants
• GB 9685-2016 for food contact materials in China

Typical usage ratio

• 20–40% EVA for high-tack or flexible hot melts
• Balance with hydrocarbon resins, tackifiers, and paraffin waxes
• Ratio optimized for open and set time, adjusted for substrate porosity and application method

Downstream process integration

• Fed into hot melt gear or extrusion mixers
• Blended to homogeneity prior to block, pillow, or pellet formation
• Applied on roll coaters, slot die, or spray systems in converting lines

Final product types

• Bookbinding adhesives
• Packaging and carton sealing adhesives
• Diaper and hygiene construction glues
• Product assembly hot melt adhesives

3. Cable and Wire Insulation Compounds

The 1703 grade integrates into thermoplastic and crosslinked insulation recipes for electrical cable sheathing and primary insulation. Resin processability supports smooth compounding with inorganic fillers, antioxidants, and fire retardants. Mixing, extrusion, and crosslinking parameters comply with IEC and GB electrical property standards, with users controlling melt temperature and residence time to balance dielectric strength against mechanical flexibility. End manufacturers select formulation footprints to address voltage rating, flame retardance, and bending stress, which influence the downstream extrusion calibration and final wire product performance.

Industry compliance standards

• IEC 60502 and IEC 60811 (Power cable insulation and testing)
• GB/T 2951 (Chinese cable insulation standards)
• RoHS 2011/65/EU (hazardous substances regulation)
• ISO 9001/14001 for cable compound manufacturing

Typical usage ratio

• 30–40% EVA as the primary polymer in cable compound
• Balance of 60–70% with fire retardants (ATH/MDH), plasticizers, and stabilizers
• Proportion selected based on voltage class, mechanical, and flame test requirements

Downstream process integration

• Compounded in twin-screw extruders with inorganic fillers and synergists
• Direct extrusion onto conductor wire or cable bundles
• Optional irradiation or silane crosslinking in extrusion lines

Final product types

• Low-voltage power cable insulation
• Data and signal cable sheaths
• Flexible appliance cords
• Fire-retardant building wire jackets

4. Foamed Footwear and Midsoles

In footwear compounding, 1703 acts as the base polymer for injection-molded and compression-molded EVA foams. Processors select molecular weight and acetate content to ensure density control, compression set, and energy rebound for shoes, sandal soles, and sport midsoles. The compounding sequence blends EVA pellets with blowing agents, crosslinkers, and pigments under high-shear internal mixers. Key process steps involve press-cure expansion and thermal post-processing, which dictate pore structure uniformity and comfort properties of the final molded part. Accurate feed and temperature control at the mix and mold stage directly determine product durability and appearance.

Industry compliance standards

• GB/T 15107 (Resin-based sports shoes standards)
• ISO 20871 (Footwear safety and performance)
• EN 71-3 (Safety in toys and child products, for kids shoes)
• REACH Regulation (EC) No 1907/2006 for restricted substances

Typical usage ratio

• 60–85% EVA resin in base compound
• Blowing agent 3–8% by weight, adjusted for expansion ratio and closed/open cell structure
• Pigments, crosslinkers, and lubricants: balance 5–10% total

Downstream process integration

• Melt compounded and pre-cured in industrial mixers
• Injected or compression-molded under controlled temperature and pressure
• Cooling and finishing to achieve surface structure and color homogeneity

Final product types

• Sports shoe midsoles
• Sandal outsoles
• Children’s footwear cushioning
• Custom-molded insoles and orthotic pads