Applications of Sinopec Yanshan 24J6 EVA in Industrial Manufacturing

Sinopec Yanshan 24J6 EVA, with its enhanced flexibility, transparency, and compatibility, finds extensive use in downstream production of flexible packaging, photovoltaic encapsulation, hot melt adhesives, wire and cable insulation, footwear foams, and modification of bitumen membranes. The following sections outline key industrial application segments, integrating specific compliance benchmarks, formulation ranges, processing stages, and leading finished products.

1. Flexible Packaging Films for Food and Pharmaceuticals

Manufacturers in the flexible packaging industry use 24J6 EVA as a core matrix polymer to improve sealability, transparency, and impact flexibility in multilayer films intended for primary food and pharmaceutical product contact. The material's melt index and high VA (vinyl acetate) content grant superior mechanical strength and puncture resistance, meeting the rigorous shelf-life and barrier requirements of high-speed FFS (Form-Fill-Seal) packaging lines. Strict compliance with migration, purity, and GMP rules is essential for downstream users, who calibrate usage ratios to tailor the final film's optical and tactile properties for diverse market segments.

Industry compliance standards

• FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers intended for food contact)
• EU Regulation (EU) No 10/2011 on plastic materials and articles intended to come into contact with food
• China National Standard GB 9685–2016 (Additives for use in food contact materials and articles)
• ISO 22000 and HACCP systems for food packaging

Typical usage ratio

• 5–25% by weight in co-extruded blends, depending on barrier requirements, sealing temperature profile, and required toughness; higher EVA content for high-flex packages

Downstream process integration

• Direct introduction into blown or cast film extrusion as a middle or sealing layer; often pellet-blended with LDPE or LLDPE, followed by extrusion lamination, corona treatment, and slitting operations

Final product types

• Pouch films for snacks, dairy, and ready-meal packaging
• Pharmaceutical blister lidding films
• Vacuum packaging webs
• Lamination films for food wrappers and household goods

2. Photovoltaic (PV) Module Encapsulant Sheets

Producers of solar panel encapsulant sheets select 24J6 EVA for its optimized melt viscosity and high VA composition, which provide strong adhesion to both glass and silicon cells upon lamination. This ensures long-lasting weatherability, UV stability, and aging resistance for outdoor solar modules. The raw material's processing window and stringent purity profile align with strict international PV certification requirements, demanding precise blending and crosslinking conditions on advanced calendaring and extrusion lines.

Industry compliance standards

• IEC 61215 (Crystalline silicon terrestrial PV modules – Design qualification and type approval)
• UL 1703 (Standard for Flat-Plate Photovoltaic Modules and Panels)
• RoHS Directive 2011/65/EU (Restriction of Hazardous Substances)
• TUV certification protocols for PV encapsulation

Typical usage ratio

• 70–100% of total sheet mass; crosslinkable additives (0.5–5%) adjusted to meet required gel content and optical transmittance

Downstream process integration

• Compounding and extrusion into sheet form, followed by crosslinking with organic peroxides during thermal lamination to encapsulate PV cells, ensuring adhesion and transparency in module assembly

Final product types

• Solar module encapsulant sheets (front and back sheets)
• BIPV (Building Integrated Photovoltaic) laminate films
• Thin-film module encapsulation layers

3. Hot Melt Adhesive Formulations

Industrial adhesive formulators utilize 24J6 EVA as the principal polymer backbone in hot melt systems for packaging, bookbinding, woodworking, and hygiene article assembly. Its balanced flexibility and processability create adhesives with fast tack, reliable bond strength over wide temperature ranges, and compatibility with tackifiers or waxes specific to end-use demands. Regulatory frameworks governing emissions and performance certification must be observed throughout compounding and end-use application.

Industry compliance standards

• REACH Regulation (EC) No 1907/2006 for SVHC content
• FDA 21 CFR 175.105 (Adhesives for food packaging)
• EN 923 (Adhesives—Terms and definitions and identification)
• ISO 9001:2015 for QC systems in adhesive manufacture

Typical usage ratio

• Typically 20–50% by weight in adhesive mass, modulated based on viscosity, set time, and flexibility requirements; higher ratios for pressure-sensitive adhesives

Downstream process integration

• Integrated into mixing tanks with resins, plasticizers, and stabilizers, followed by high-shear melting, filtration, and pelletizing or direct filling into pillow, block, or stick formats for customer melting equipment

Final product types

• Case and carton sealing adhesives
• Book spine glues
• Disposable hygiene article assembly adhesives
• General-purpose hot melt glue sticks

4. Wire and Cable Insulation and Sheathing

Wire and cable manufacturers adopt 24J6 EVA as a modifier and co-polymer in flame-retardant, low-smoke halogen-free (LSHF) insulation and jacket compounds for power, communication, and electronic transmission cables. The polymer’s electrical insulation properties, flexibility at low temperatures, and resistance to heat deformation suit demanding cable construction specifications. Processing and formulation require tight control to ensure compliance with fire safety and electrical performance mandates.

Industry compliance standards

• IEC 60332 (Tests on electric and optical fibre cables under fire conditions)
• UL 1581 (Reference Standard for Electrical Wires, Cables, and Flexible Cords)
• RoHS and REACH for hazardous substance restrictions
• IEC 60754 (Test on gases evolved during combustion of materials from cables)

Typical usage ratio

• 10–35% by weight in cable compound formulations; precise loading depends on desired flexibility, flame-retardant filler incorporation, and final product category

Downstream process integration

• Melt blending with fillers (e.g., ATH for flame retardance), pigments, and stabilizers in twin-screw extruders, feeding directly to wire coating, insulation, or sheathing lines through continuous extrusion and cooling

Final product types

• LSHF building wire and power cable sheaths
• Instrument and data cable insulation
• Automotive low-voltage cable jackets
• Flexible control and appliance cords

5. Foamed Midsole and Insole Materials for Footwear

Footwear manufacturers use 24J6 EVA for producing lightweight, shock-absorbing midsole and insole foams in athletic, leisure, and safety shoes. The material's cell structure stability, resilience, and compression set retention offer enduring cushioning performance, while processing adapts to a range of hardness and density profiles for targeted end-user comfort and durability. Strict attention is given to workplace and consumer safety rules, as well as emissions and mechanical durability testing at both production and finished product stages.

Industry compliance standards

• ISO 20344/20345 (Personal protective equipment—Test methods for footwear)
• REACH Regulation (EC) No 1907/2006—Restricted Substances List
• GB/T 15107 (Test method for shoes EVA foam material - China National Standard)
• CPSIA (Consumer Product Safety Improvement Act - applicable for some export regions)

Typical usage ratio

• 60–95% in foam blend; exact level optimized for desired density, rebound, and softness, with modification by blowing agent and crosslinking system selections

Downstream process integration

• Compounding with blowing agents, crosslinkers, anti-aging additives, followed by sheet extrusion or injection molding, then foaming/crosslinking in press molds to achieve final dimensions and hardness before die cutting and assembly

Final product types

• Midsole blocks for running and sports shoes
• Molded insoles and footbeds
• Open-cell and closed-cell foam sandals
• Protective safety shoe shock absorption pads

6. Polymer Modified Bitumen Membranes (PMB) for Roofing and Waterproofing

Producers of polymer modified bitumen membranes incorporate 24J6 EVA to improve cold flexibility, phase stability, and tensile strength in waterproofing layers for roofing, underground, and bridge applications. EVA enhances the compatibility of polymer systems with asphalt, reducing temperature susceptibility and improving waterproof performance over a wide climate range. Processing demands precise control of blending temperature and shear to achieve uniform dispersion within the bitumen matrix, ensuring consistent final product quality and compliance.

Industry compliance standards

• EN 13707 (Flexible sheets for waterproofing - Reinforced bitumen sheets for roof waterproofing)
• ASTM D6164 / D6222 (Standard specification for SBS and APP modified bituminous sheet materials)
• GB/T 328.1-2007 (China Standard for Modified Bituminous Membranes)
• ISO 14001 for environmental quality in manufacture

Typical usage ratio

• 3–15% by weight of the total bitumen compound, adjusted according to climate, reinforcement type, and flexibility specifications

Downstream process integration

• Hot melt mixing of EVA pellets into molten bitumen with controlled addition of mineral fillers and stabilizers, followed by sheet calendaring, surface finishing, cooling, and roll packaging

Final product types

• PMB roofing roll membranes for commercial and residential buildings
• Waterproofing sheets for tunnels, bridges, and underground structures
• Self-adhesive and torch-on roofing membranes
• Crack-bridging road and bridge waterproofing layers