Applications of Sinopec Yanshan 9J2 EVA in Industrial Manufacturing

Sinopec Yanshan 9J2 EVA (Ethylene-Vinyl Acetate Copolymer) finds established demand in multiple industrial sectors, where its distinctive physical and chemical properties provide targeted performance benefits. We outline below the primary downstream application domains, covering the specific regulatory expectations, dosage principles, manufacturing stages, and representative end products relevant to each sector.

1. Photovoltaic Module Encapsulation

Photovoltaic (PV) manufacturers use this EVA grade for encapsulating solar cells to ensure durability, electrical insulation, and reliable lamination under varying environmental conditions. Its melt flow characteristics suit high-throughput film extrusion and laminating lines, delivering clarity and crosslinking requirements essential for photovoltaic cell protection through the full module life cycle.

Industry compliance standards

• IEC 61215 (Terrestrial photovoltaic modules – Design qualification and type approval)
• UL 1703 (Standard for Flat-Plate Photovoltaic Modules and Panels)
• RoHS Directive (Restriction of Hazardous Substances)
• REACH Regulation (EC No 1907/2006)

Typical usage ratio

• Typically 450–550 g/m² per film layer; formulation blend rates of 100% EVA for encapsulation layer; crosslinking additives at 1.5–3% based on film targeting crosslink density/optics/flexibility. Adjusted by module architecture and cell type (mono/polycrystalline, bifacial).

Downstream process integration

• Resin is melted and extruded into sheets in the film casting stage, followed by thermal lamination with glass and backsheet under vacuum and pressure; crosslinking achieved during lamination at 135–150°C for 10–18 minutes depending on film thickness and module design.

Final product types

• Crystalline silicon solar modules
• Thin film photovoltaic panels
• Bifacial solar modules
• Building-integrated photovoltaic glass panels

2. Hot Melt Adhesives for Packaging and Bookbinding

Industrial adhesive compounders select this EVA copolymer for its adjustable melt viscosity, quick set times, and compatibility with tackifiers and waxes. In automated packaging and bookbinding, the material allows precise, repeatable bonding at high application speeds. Formulators blend for tailored adhesion, flexibility, and thermal stability, while meeting demanding certification and material migration requirements in direct and indirect food-contact applications.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for Food Packaging)
• EN 923 (Adhesives – Terms and definitions)
• ISO 9001:2015 (Quality management systems in manufacturing)
• EU Regulation (EC) No 1935/2004 (Materials in contact with food)

Typical usage ratio

• EVA content in hot-melt adhesive: 25–45% by weight; final ratio varies with desired open time, bond strength, and substrate compatibility; tackifier resins, plasticizers, and waxes complement the base to balance performance.

Downstream process integration

• Material is pelletized, mixed with formulation additives, and compounded in heated kneaders or continuous reactors; adhesive extruded as beads or slats, ready for melting and metered application to substrates via hot-melt guns or rollers in end-user lines.

Final product types

• Corrugated carton adhesives for automated packaging lines
• Bookbinding glues for glossy magazines and hardcovers
• Labeling adhesives for beverage and food containers
• General-purpose hot-melt sticks and rods

3. Shoe and Footwear Soling Compounds

Footwear compounders utilize 9J2 EVA to produce lightweight, flexible midsoles and outsoles, optimizing comfort, durability, and shock absorption in casual, athletic, and safety footwear. Parameters for foam structure, compression resistance, and rebound are precisely set during compounding and injection, with process adjustments to achieve uniformity and compliance with environmental and workplace regulations in finished products.

Industry compliance standards

• ISO 20871 (Footwear – Test methods for outsoles)
• GB/T 2673-2020 (China Standard: Shoes general technical requirements)
• REACH Regulation (EC No 1907/2006) on substance use
• California Proposition 65 (where exported to US markets)

Typical usage ratio

• EVA content in foam compound: 50–95%, depending on the blend with fillers (e.g. calcium carbonate), blowing agents (3–7%), and crosslinkers. Proportion is chosen to target hardness, density, and tensile strength required by shoe model.

Downstream process integration

• Mixers compound EVA pellets with additives, followed by extrusion or direct-injection molding; expansion and cell formation are triggered during heating. Crosslinking and density control determine soling quality; demolded parts then pass through trimming and finishing lines.

Final product types

• Injection-molded sport shoe midsoles
• Compression-molded beach and casual sandal soles
• Lightweight work safety shoe outsoles
• Children’s injection or compression molded footwear

4. Wire and Cable Insulation Compounds

Wire and cable manufacturers rely on this EVA type for bedding and sheathing compounds, leveraging its dielectric properties and flexibility over a broad temperature range. Processors adjust fill ratios and incorporate fire retardants to ensure compliance with international cable flame retardancy, toxicity, and electrical insulation criteria, particularly in low smoke zero halogen (LSZH) and general cable categories.

Industry compliance standards

• IEC 60228 (Conductor sizes for insulated cables)
• UL 1581 (Testing for Electrical Wires, Cables)
• RoHS Directive (lead and heavy metal content)
• EN 50363-0 (Insulating, sheathing materials for cable)

Typical usage ratio

• EVA content in insulation/sheathing compound: 30–60% by weight, adjusted with flame retardants (30–40% ATH) and plasticizers. Final composition balances flexibility, heat deformation, and electrical properties as per cable spec.

Downstream process integration

• Pellets are dry blended with fillers and masterbatches, then fed into twin-screw extruders for cable coating; molten compound is applied over wire conductors, then cooled and surface-embossed before quality testing and winding.

Final product types

• Low-voltage power cable jackets
• Signal and data transmission cables (insulation layer)
• Low smoke zero halogen (LSZH) cable sheaths
• Flexible appliance cord insulation

5. Injection-Molded Toys and Consumer Goods

Toy and household goods manufacturers value this EVA grade’s processing safety and softness for child-safe, durable articles. Compliant with international consumer safety standards, production lines formulate to minimize migration of regulated substances. Foam structure, resilience, and color stability enable distinctive features in finished goods through advanced injection molding, often in combination with safe colorants and blowing agents.

Industry compliance standards

• EN 71-3 (Safety of Toys: Migration of certain elements)
• ASTM F963 (US Consumer Safety Specification for Toy Safety)
• GB 6675 (China National Toy Safety Standard)
• REACH Annex XVII (Restriction of hazardous substances in consumer goods)

Typical usage ratio

• Granulate usage in base formulation: 70–100% EVA for soft toys, 50–70% for semi-rigid items; blowing agents (2–7%) and colorants incorporated as required for feature targeting.

Downstream process integration

• Compound processed via single or multi-cavity injection molding, with temperature and holding pressure parameters optimized for cell structure and surface safety. Finished toys then post-cured, cooled, and tested for migration/performance properties.

Final product types

• Foamed building blocks and mats
• Waterproof bath toys
• Children’s kneeling pads
• Ergonomic soft-grip handles for household items