Applications of Sinopec Yanshan 9F1 EVA in Industrial Manufacturing

Sinopec Yanshan 9F1 EVA (Ethylene Vinyl Acetate Copolymer) delivers reliable processing performance and end-product consistency for core industrial manufacturing sectors. As the original manufacturer, we supply 9F1 EVA for recognized downstream uses supported by validated standards, detailed formulation guidance, production process alignment, and end-user QC integration.

1. Foamed Footwear Midsoles and Insoles

Footwear manufacturers use our EVA in the compounding and molding of lightweight, shock-absorbing midsoles and insoles. EVA’s melt flow properties enable precise cell structure control during cross-linking foaming, resulting in durable cushioning for sports and leisure shoes. Complex foam matrices demand consistency in copolymer ratio and vinyl acetate content to maintain compliance with global consumer safety requirements and ensure production stability during high-throughput shoe sole and insole lamination lines.

Industry compliance standards

• EU REACH Regulation (EC) No. 1907/2006
• EN ISO 20344:2021 (Personal protective footwear testing)
• China GB 30585-2014 (Safety of footwear products)
• California Proposition 65 (relevant substances control)

Typical usage ratio

• 60% – 85% by weight of base compound. Adjustments depend on target hardness (Shore A), resilience, and desired expansion ratio, with plasticizers and cross-linking aids comprising the remainder.

Downstream process integration

• Mixer blending with blowing agents and cross-linkers, extrusion or injection molding, steam foaming and curing, post-form trimming for final midsole and insole shapes.

Final product types

• Sports shoe midsoles (running trainers, basketball shoes)
• Casual and lifestyle shoe insoles
• Work and safety footwear padding

2. Hot Melt Adhesives (HMA) for Packaging and Bookbinding

Packaging and printing adhesive formulators rely on 9F1 EVA as a key polymer base for hot melt adhesives, which require accurate balance between flexibility, tack, and thermal stability. The adjusted vinyl acetate content of the copolymer provides low-temperature flexibility while ensuring strong substrate wetting and cohesive bonding on corrugated board, labels, and case sealing. Large-scale adhesive operations demand EVA grades with tightly controlled melt indices to reduce defects in high-speed automated applications, with all ingredients evaluated for compliance with end-use packaging safety requirements.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for indirect food contact)
• EN 12368-1 (Packaging adhesives test methods)
• China GB 9685-2016 (Food packaging materials)
• ISO 9001:2015 (Quality management for continuous production)

Typical usage ratio

• 25% – 45% by weight in adhesive base. The specific proportion depends on required open time, viscosity, and substrate penetration, with tackifiers and waxes as common modifiers.

Downstream process integration

• High-shear blending with tackifiers/resins, continuous extrusion, strand pelletizing, followed by re-melting at end-user’s adhesive station for application on packaging, labeling, or binding lines.

Final product types

• Hot melt glue sticks and cartridges
• Automated case and carton sealing adhesives
• Book spine glues for perfect binding

3. Encapsulant Films for Photovoltaic Modules

Leading PV module manufacturers process our EVA in the production of encapsulant films that seal and protect solar cells from moisture and atmospheric exposure. The 9F1 grade is specified for its compatibility with lamination thermal cycles and high optical clarity, essential for maintaining module efficiency and outdoor aging resistance. Consistency in melt flow and gel content ensures uniform film thickness and reliable cross-link density throughout lamination, facilitating module certifications for both standard and high-performance cell technologies.

Industry compliance standards

• IEC 61215 (Crystalline silicon PV modules – durability qualification)
• UL 1703 (Flat-plate PV module safety standard)
• ISO 9001:2015 (Module assembly process control)
• RoHS Directive 2011/65/EU (Restriction of hazardous substances)

Typical usage ratio

• 100% as encapsulant sheet or co-extruded component; sheet thickness typically 0.4 – 0.6 mm per layer, modulated based on cell thickness and desired electrical insulation performance.

Downstream process integration

• Extrusion or calendaring into sheets/films, roll-to-roll lamination, vacuum or autoclave module encapsulation, in-line crosslinking/curing with post-process visual and gel content QC.

Final product types

• Pv module encapsulant interlayers for crystalline silicon cells
• Bifacial and double-glass module films
• Flexible PV panel encapsulant sheets

4. Cable & Wire Insulation and Sheathing Compounds

Cable and wire manufacturers select 9F1 EVA for use in low-voltage wire insulation and outer sheathing, where fire safety, dielectric stability and mechanical performance are critical. The polymer’s vinyl acetate content supports required flexibility, stress-crack resistance, and flame retardant loading. Quality programs in cable extrusion rely on controlled melt index and thermal performance parameters to maintain uniform wall thickness, meet regulatory flammability targets, and support functional life under cyclical thermal and electrical stresses.

Industry compliance standards

• IEC 60502-1 (Power cables – general requirements)
• UL 1581 (Electrical wires and cables – reference standard)
• RoHS Directive 2011/65/EU
• China JB/T 10491-2011 (Sheath compound for wire and cable)

Typical usage ratio

• 40% – 80%, depending on target flexibility and flame retardance; filled with magnesium hydroxide or ATH, with additional stabilizers as required by insulation classification level.

Downstream process integration

• Banbury or twin-screw compounding with additives, pelletization, extrusion over conductor strands for inner insulation or outer sheathing, followed by online spark, thickness, and fire-retardance testing.

Final product types

• Low voltage cable insulation
• Flexible wire sheaths (power cords, appliance wire)
• Flame-retardant cable jackets

5. Injection-Molded Toys and Sporting Goods

Toy and sporting goods manufacturers prefer EVA for its non-toxic formulation potential and soft-touch flexibility, essential for precision-molded recreational items. Our material’s narrow melt index range supports dimensionally stable molding for both large and intricate shapes, while compatibility with approved colorants and impact additives allows producers to achieve repeatable compliance with international consumer product safety directives. End products undergo rigorous migration, durability, and mechanical safety tests, relying on EVA’s consistent physical properties throughout manufacturing batches.

Industry compliance standards

• EN 71-3 (Migration of certain elements in toys)
• ASTM F963 (Standard Consumer Safety Specification for Toy Safety)
• GB 6675.4-2014 (Mechanical and physical properties test)
• ISO 8124-2014 (Safety of toys, migration, and mechanical tests)

Typical usage ratio

• 60% – 100% of part mass depending on softness and impact requirements. The addition of pigments or flame retardants adjusts based on product purpose and market destination.

Downstream process integration

• Dry blending with color and property-modifying additives, melt-plasticizing in injection molding machines, precision shot filling into multi-cavity steel molds, automated cooling, and demolding, with batch QC for tensile, flexural, and chemical migration tests.

Final product types

• Soft play balls and outdoor sport juggling goods
• Protective gear components (shin pads, guards, mouthpieces)
• Beach and pool toys

6. EVA-Based Film Casting for Stationery and Office Supplies

Producers of stationery laminating films and self-adhesive sheets use EVA as a critical resin component. Its clarity and bonding capabilities facilitate reliable adhesion to a range of paper and plastics, while flexibility ensures wrinkle-free application and resilience during die-cutting or embossing operations. Strict process control in film casting and surface treatment allows converters to hit application-specific benchmarks for transparency, shrinkage during lamination, and post-lamination durability, all within standardized manufacturing environments that guarantee product safety and usage consistency in office and educational settings.

Industry compliance standards

• EN 14041 (Safety of floor covering films)
• ISO 22196 (Antibacterial activity on plastic film surfaces)
• China GB/T 14688-2008 (Film and sheet standard test methods)
• REACH (for additives and coatings in contact with children’s products)

Typical usage ratio

• 70% – 95% in the film formula, adjusted for gloss, thickness (15–100 microns), and adhesive coverage goals depending on substrate and sheet application method.

Downstream process integration

• Extruder compounding with slip agents/antistats, flat die or blown film casting, corona or flame treatment for surface energy adjustment, slitting and rewinding into rolls or sheet stock for further converting.

Final product types

• Thermal lamination films for documents and books
• Self-adhesive protective sheets
• Transparent overlay films for office and school use