Applications of Sinopec Yanshan 18J3 EVA in Industrial Manufacturing

Sinopec Yanshan 18J3 EVA, with its characteristic balance of vinyl acetate content and melt flow rate, supports several critical industries requiring advanced physical properties and stable performance. We have highlighted key industrial sectors where this grade delivers practical value based on consistent commercial use and verified downstream demand.

1. Solar Photovoltaic Encapsulant Film Production

This grade meets the demanding requirements for producing encapsulant films in the solar photovoltaic module industry, offering reliable cross-linking response, low gel content, and controlled acetic acid outgassing. Module manufacturers apply this EVA during the lamination of crystalline silicon solar cells to protect against moisture ingress and mechanical damage through the module’s operational life.

Industry compliance standards

• IEC 61215 (Crystalline Silicon Terrestrial Photovoltaic Modules – Design Qualification and Type Approval)
• IEC 61730 (Photovoltaic Module Safety Qualification)
• UL 1703 (Standard for Flat-Plate Photovoltaic Modules and Panels)
• REACH and RoHS Directives for hazardous substances

Typical usage ratio

• 60–80 wt% in co-extruded or cast encapsulant film layers, adjusted based on targeted cross-linking, gel content, and module design (cell type, thickness)

Downstream process integration

• Compounding phase: Mixed with UV absorbers, cross-linking agents, and stabilizers
• Film extrusion or calendering: Slit or sheet films used for interlayer encapsulation
• Module assembly: Vacuum lamination under controlled temperature and pressure

Final product types

• Encapsulant films (single/double-sided)
• Photovoltaic solar glass modules for commercial, utility-scale, and residential installations

2. Hot Melt Adhesive Formulations

This specialty grade forms the core polymer in hot melt adhesives providing tailored flexibility, adhesion-to-various substrates, and good processability at moderate melt temperatures. Typical users include technical adhesive formulators supplying automotive trim, woodworking, textile lamination, footwear assembly, and packaging tape manufacturers, ensuring product consistency and batch-to-batch stability.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for food contact articles, as applicable)
• ISO 9001 QMS for adhesive production
• EN 923 (Adhesives – Terms and definitions)
• ASTM D1876 (Peel Resistance of Adhesives)

Typical usage ratio

• 25–48 wt% as primary base polymer, customized by formulation viscosity and flexibility requirements; ratio varies with waxes, tackifiers, and additives

Downstream process integration

• Melt blending with tackifiers, resins, and stabilizers in pre-mix or continuous reactors
• Solidification via pelletizing or block casting
• Hot melt extrusion or drum fill for industrial batch and continuous systems

Final product types

• Hot melt adhesive sticks
• Granular/pelletized adhesives
• Pressure-sensitive tapes, bookbinding glues, case and carton sealing adhesives

3. Cable Sheath and Wire Insulation Compounds

This EVA is a critical resin for low- and medium-voltage power cable and telecommunication wire insulation and sheathing compounds, enhancing flexibility, electrical insulation performance, and resistance to cracking under dynamic bending. Manufacturers in electrical, automotive, and infrastructure sectors rely on the precise melt index and low contaminant levels for consistent extrusion quality.

Industry compliance standards

• IEC 60502-1 (Power cables with extruded insulation and their accessories for rated voltages from 1 kV up to 30 kV)
• UL 62/UL 758 (Flexible Cords and Fixtures/Wiring Materials)
• RoHS and REACH chemical compliance for electrical insulation
• GB/T 2951 (Cable Insulation and Sheath – Test Methods)

Typical usage ratio

• 18–36 wt% as the elastic component (with PE or PVC matrix) to tune softness, flame retardancy, and tensile properties; modified based on compound recipe

Downstream process integration

• Resin pre-weighing and dry blending, followed by twin-screw or Banbury compounding with plasticizers and flame-retardant fillers
• Uniform melt extrusion over copper or aluminum wire core, with air or water cooling
• Post-extrusion crosslinking (where XLPE/EVA blends used) and offline testing

Final product types

• Electrical cable sheaths for residential, commercial, or industrial wiring
• Flexible appliance cords and automotive wire insulation
• Low-voltage communication cable jackets

4. Foam Shoe Sole and Midsole Manufacturing

Shoe and sportswear manufacturers select this grade as a foundational component in closed-cell foam for injection-molded midsoles and outsoles, targeting improved impact resilience, uniform microcellular structure, and tunable hardness without plasticizer migration, critical for athletic and lifestyle footwear lines. Automated molding lines integrate the material for consistent cell structure control and color dispersion.

Industry compliance standards

• ISO 20871 (Footwear – Test methods for outsoles – Abrasion resistance)
• GB/T 15107 (Polymeric Footwear Materials)
• REACH Annex XVII (Restricted substances in consumer goods)
• National and customer-specific restricted substance lists (RSL)

Typical usage ratio

• 35–75 wt% as the core foaming resin, adjusted for density, hardness, and cell size; co-blended with PE or rubber as needed for desired cushioning

Downstream process integration

• Dry pre-mixing with chemical foaming agents (e.g., azodicarbonamide), pigments, and cross-linkers
• Direct injection or compression molding via automated equipment
• Foam expansion under controlled temperature and pressure, followed by cooling and trimming operations

Final product types

• Sports shoe soles and midsoles
• Beach sandals and slippers
• Insoles and comfort footwear components

5. Film Casting for Packaging and Lamination

Flexible film converters utilize this resin in co-extruded and cast films designed for food contact, medical, and technical packaging where transparency, tear resistance, sealability, and impact strength are required. Converters benefit from reliable batch consistency for smooth film gauge control in high-speed lines, as well as efficient downstream lamination with PE and barrier films.

Industry compliance standards

• FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers for food packaging films)
• EU No 10/2011 (Regulation on plastic materials and articles intended to come into contact with food)
• ISO 22000 (Food Safety Management Systems, as applicable)
• EN 868-5 (Packaging materials for terminally sterilized medical devices)

Typical usage ratio

• 17–35 wt% in functional packaging film layers or as an adhesion-promoting tie-layer; adjusted for clarity, seal strength, and flexibility targets

Downstream process integration

• Resin metering and compounding with slip agents, anti-blocks, and processing stabilizers
• Blown or cast film extrusion, followed by corona/thermal treatment if multilayer adhesion is required
• Lamination to paper, foil, or barrier film in secondary downstream operation

Final product types

• Food packaging films
• Medical device pouches and peelable lids
• Laminated flexible packaging for pharmaceuticals and personal care