Applications of Sinopec USI-629 EVA in Industrial Manufacturing

Sinopec USI-629 EVA copolymer delivers reliable performance across several value-driven industrial sectors. By leveraging its precise vinyl acetate content and controlled melt index, manufacturers achieve stable processing, targeted mechanical characteristics, and compliance-driven product development at the plant scale.

1. Solar Photovoltaic Encapsulant Film Production

Solar module manufacturers select USI-629 EVA for producing encapsulant films due to its excellent clarity, adhesiveness, and controlled crosslinking capacity. The material’s consistency supports lamination cycles under strict thermal and vacuum conditions used in crystalline silicon and thin-film panel assembly lines, ensuring minimal feedstock variation and efficient module throughput.

Industry compliance standards

• IEC 61215 - Design qualification and type approval for crystalline silicon terrestrial PV modules
• UL 1703 - Safety standards for flat-plate PV modules and panels (North America)
• RoHS Directive 2011/65/EU - Restriction of hazardous substances
• REACH Regulation (EC) No 1907/2006 - Registration, Evaluation, Authorisation, and Restriction of Chemicals

Typical usage ratio

• 65–100 wt% EVA in encapsulant film base formulation; ratio adjusted for targeted crosslink density and layer thickness (typically 0.3–0.7 mm)

Downstream process integration

• Feeds directly into extrusion and calendering to form film rolls
• Laminated onto cells in module assembly then crosslinked at 140–155°C under vacuum
• Integrated with edge sealants and backsheet layers during module finishing

Final product types

• Crystalline silicon solar modules (mono/poly)
• Thin-film photovoltaic modules
• BIPV (Building Integrated Photovoltaics) components

2. Hot Melt Adhesive Manufacture

Formulators utilize USI-629 EVA to generate hot melt adhesives with tailored open time, flexibility, and bond strength for woodworking, packaging, and hygiene product lines. Control over vinyl acetate content allows precise compatibility with tackifiers and waxes, ensuring adhesives remain within regulated migration limits, especially for food packaging applications.

Industry compliance standards

• FDA 21 CFR 175.105 - Adhesives for indirect food contact
• CFR 16 1500.3(c)(4) - Consumer product safety for glue sticks
• EN 1230-2 - Odour and flavor transfer in paper/board adhesives (EU food packaging)
• REACH SVHC check for restricted substances

Typical usage ratio

• 30–60 wt% EVA in adhesive blend; ratio tuned for viscosity and hot tack performance per application (e.g., 40–55% for bookbinding, 50–60% for hygiene)

Downstream process integration

• Compounded in high-shear mixers with resins, waxes, and stabilizers
• Cast or extruded into pellets, rods, or blocks for downstream melting
• Converted into finished adhesive forms for roll, bead, or spray systems

Final product types

• Hot melt glue sticks
• Case and carton sealing adhesives
• Disposable hygiene adhesives (diapers, sanitary napkins)
• Bookbinding adhesives

3. Wire and Cable Insulation Compound

Electrical insulation compounders apply USI-629 EVA as a base polymer in low-voltage cable sheathing and insulation, taking advantage of its stress cracking resistance and electrical insulating properties. Its melt index and compatibility with flame retardant systems provide manufacturers with repeatable production runs for compliant cable grades, used in building wiring and consumer electronics.

Industry compliance standards

• IEC 60502-1 - Power cables with extruded insulation and low voltage requirements
• UL 62/UL 758 - Flexible cords and appliance wiring material safety
• RoHS 2011/65/EU - For electrical components
• REACH Annex XVII - Substances restricted in cables and insulation

Typical usage ratio

• 35–65 wt% EVA in cable compound; level adjusted for flexibility and fire performance, higher ranges for extra supple insulation

Downstream process integration

• Direct feeding into compound extrusion with inorganic flame retardants and stabilizers
• Palletizing and pelletizing for cable coating lines
• Co-extrusion onto copper or aluminum wire in continuous jacket application

Final product types

• Low-voltage power cables
• Household appliance cord sets
• Network and signal cable insulation
• Audio/video connection leads

4. Foamed Shoe Sole and Sport Insole Production

Footwear technology processors integrate USI-629 EVA in foam formulations for shoe soles and sport insoles, harnessing its consistent cell structure generation and abrasion resistance. Its interaction with blowing agents and precise density control produces cushioning layers optimized for flexibility, weight, and resilience, key for both sports and leisure markets.

Industry compliance standards

• ISO 20344 - Personal protective equipment test methods (footwear)
• REACH Regulation (Annex XVII) - Limits on restricted raw materials
• GB 30585 – Chinese national standard for EVA-used footwear and limits of volatile substances
• Prop 65 (California) warning checks on chemical content

Typical usage ratio

• 50–80 wt% EVA in foam blend; adjusted for target hardness (25–50 Shore C), expansion ratio, and functional fillers inclusion

Downstream process integration

• Mixed in continuous or batch mixers with blowing agents, crosslinkers, pigments
• Foam sheet extrusion and press-molding for shape forming
• Die-cutting and finishing in automated shoe-line assembly

Final product types

• Shoe midsoles and outsoles
• Orthopedic and sport insoles
• Comfort foam inserts
• Children’s and athletic footwear bottoms

5. Film Grades for Agriculture and Greenhouse Coverings

Agricultural film producers employ USI-629 EVA in plastic film formulations to achieve high tear resistance, flexibility under cold conditions, and tight light transmittance control. The copolymer structure supports integration with UV stabilizers and anti-fog additives, producing durable covers that withstand harsh weather cycles and pesticide exposure during multi-season use.

Industry compliance standards

• EN 13206 - Plastic film standards for agricultural use
• ISO 1860-1 - Greenhouse covering material characterization
• US EPA tolerance for indirect food contact in agricultural films
• GB/T 4455 - Chinese standards for PE and EVA agricultural film

Typical usage ratio

• 10–30 wt% EVA in agricultural film blend; ratio set for impact resistance and thermal insulation based on regional climate

Downstream process integration

• Compounded with PE and specialty additives in blown film lines
• Inline thickness and haze monitoring during roll production
• Slitting, folding, and packaging for direct delivery to agricultural end-users

Final product types

• Greenhouse covers
• Mulching films
• Low tunnel row covers
• Horticultural protection films

6. Medical IV Bag and Solution Container Production

Medical device manufacturers turn to USI-629 EVA in non-PVC solution bags for its flexibility, low extractables profile, and gamma sterilization stability. The resin meets criteria for physiochemical stability during autoclaving and long-term fluid contact, matching global standards for healthcare device manufacturing and pharmaceutical packaging safety.

Industry compliance standards

• USP Class VI - Biological reactivity tests for medical plastics
• ISO 10993 - Biological evaluation of medical devices
• European Pharmacopoeia (Ph. Eur.) 3.1.3 - Materials based on EVA for containers
• FDA 21 CFR 177.1350 - EVA copolymers for use in contact with food and drugs

Typical usage ratio

• 85–100 wt% EVA in non-PVC film for IV and solution container body; occasionally blended with minimal PE for film toughness

Downstream process integration

• Feeds into blown or cast film processes with sterile compounding
• Thermoformed into pouches or bags
• Sealed and welded under cleanroom conditions for sterile medical products

Final product types

• IV solution bags
• Blood and dialysis solution containers
• Medical transfer pouches
• Parenteral nutrition bags