Applications of Sinochem Quanzhou EVA in Industrial Manufacturing

Sinochem Quanzhou ethylene-vinyl acetate copolymer (EVA) serves key roles across selected downstream sectors, owing to its flexibility, adhesive properties, and compatibility with diverse polymer systems. Based on customer usage patterns and formulation feedback, we present core applications relevant to the packaging, footwear, photovoltaic, hot melt adhesives, wire and cable, and foaming industries, emphasizing technical integration, regulatory compliance, actual formulation levels, and real product types.

1. Flexible Packaging Films

Processors in the flexible packaging industry use EVA as a crucial modifier to enhance sealability, low-temperature performance, and clarity in multilayer films for food and medical-grade pouches. EVA integrates into co-extrusion lines, supporting stringent purity and organoleptic requirements. Its vinyl acetate content provides tailored melting points, responding directly to packaging converters’ barrier and sealing specifications.

Industry compliance standards

• FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers in food contact applications
• EU Regulation (EU) No 10/2011 on plastic materials intended for food contact
• GB 9685 for additive use in food packaging (China)
• EN 1186 overall migration testing for multilayer films

Typical usage ratio

• 10%–30% EVA, depending on film thickness, co-monomer content, and sealing requirements; higher levels for higher flexibility or enhanced low-temperature sealing

Downstream process integration

• Direct blending with LDPE/LLDPE resins prior to melt extrusion; EVA enters the process at gravimetric blending and dosing stage, followed by co-extrusion or blown film operations

Final product types

• Frozen food bags
• Vacuum packaging films
• Pharmaceutical sachets
• Milk pouches

2. Footwear Foam and Shoe Soles

Our material underpins the production of lightweight, shock-absorbing footwear components. Shoe manufacturers rely on EVA as the primary polymer in the compounding of midsole and outsole foam. Formulators exploit its cell structure control at the injection or compression molding phase, delivering customizable hardness and rebound for global sport and casual footwear brands.

Industry compliance standards

• ISO 20871 for footwear — Outsoles — Test methods for slip resistance
• REACH (EC) No 1907/2006 concerning restricted substances
• GB/T 3293 for physical-mechanical properties of foamed plastics (China)
• RoHS 2011/65/EU for heavy metal content in shoe components

Typical usage ratio

• 42%–60% EVA, depending on targeted density and mechanical properties; copolymer grade and VA content chosen for desired compression set and elasticity

Downstream process integration

• Dry blending with foaming agents and cross-linkers in batch mixers, followed by injection or compression molding; EVA enters as the main substrate for foaming reactions, controlled via mold temperature and pressure

Final product types

• Running shoe midsoles
• Beach sandals
• Children’s foam clogs
• Anti-fatigue insoles

3. Photovoltaic Encapsulant Sheets

Solar module integrators employ EVA as a critical encapsulation layer to secure and protect photovoltaic cells from environmental exposure and mechanical load. Designed to meet demanding optical transmission and aging performance, it is crosslinked in situ during lamination, forming a durable, stable matrix anchoring the cell string and contact ribbons.

Industry compliance standards

• IEC 61215 for photovoltaic module performance and reliability
• UL 1703 for safety testing of PV modules
• TÜV SÜD IEC 61730 for module construction and testing
• RoHS 2011/65/EU for hazardous substances restriction

Typical usage ratio

• 65%–90% EVA in sheet formulations; adjusted for optical clarity, crosslinking degree, and module architecture (glass/backsheet or bifacial), with remainder as cross-linker and stabilizers

Downstream process integration

• Sheets pre-extruded or calendered, then applied to solar cell stacks before passage through vacuum lamination presses; EVA crosslinks under heat (~150°C), anchoring glass, cells, and backsheet

Final product types

• Crystalline silicon solar panels
• Flexible solar modules
• Bifacial photovoltaic modules
• Building-integrated PV laminates

4. Hot Melt Adhesives (HMA)

EVA is widely incorporated as the principal base resin for pressure-sensitive and packaging hot melt adhesives due to its balance of cohesion, tack, and low-temperature flexibility. Adhesive manufacturers select VA content and melt index to target viscosity and bonding spectrum, ensuring performance over automated packaging lines or in craft and hygiene bonding.

Industry compliance standards

• FDA 21 CFR 175.105 for adhesives in indirect food contact
• ISO 9001:2015 for quality management in adhesive production
• ASTM D1876-08 peel resistance standards (T-peel test)
• REACH restricted substance limits for adhesive composition

Typical usage ratio

• 25%–40% EVA; formulation varies as a function of target adhesion, substrate, and open time, balanced with tackifiers, waxes, and stabilizers

Downstream process integration

• EVA supplied as pellet or powder, fed with tackifier resins and plasticizers into extrusion or mixer units; melted to homogenous adhesives, then transferred for drum or block molding, or filled hot into glue sticks

Final product types

• Case and carton sealing adhesives
• Shoe assembly adhesives
• Bookbinding glue
• Hygiene product adhesives (e.g., diaper construction)

5. Wire and Cable Insulation & Sheathing

Wire and cable compounders utilize EVA to impart flame retardancy, mechanical cushioning, and low smoke emission in low-voltage and medium-voltage insulation and jacket layers. The adaptability of EVA to high filler loadings, especially with halogen-free flame retardants, distinguishes it in energy and data cable manufacturing where safety and flexibility standards are demanding.

Industry compliance standards

• IEC 60502 for power cables with extruded insulation
• UL 1581 for electrical wires and cables test procedures
• EN 50267-2-1 for halogen acid gas content
• RoHS 2011/65/EU for restricted hazardous substances in cable materials

Typical usage ratio

• 15%–35% EVA in jacket or insulation layer; proportion increases for higher flexibility or improved flame retardancy, often paired with >50% ATH (aluminum trihydrate) filler in LSZH (low smoke zero halogen) types

Downstream process integration

• Pre-blended with flame retardants and stabilizers via compounding extruders; pelletized compound is re-melted and applied to conductors by wire coating (extrusion) lines during final cable assembly

Final product types

• Low-voltage power cables
• Data and telecom cables
• Flexible appliance cords
• Halogen-free sheathed cables for public infrastructure

6. Crosslinked Foam Sheets for Sports & Leisure

EVA forms the base resin in crosslinked and non-crosslinked foam sheets used across sports mats, swimming boards, and leisure padding products. Manufacturers control foam density and resilience through specific crosslinking chemistries and blowing agent blends, matching diverse industry standards for rebound, anti-slip, and toxicity profiles.

Industry compliance standards

• EN 71–3 for toy safety (migration of certain elements)
• GB 6675 for national toy safety (China)
• ASTM F963 for toy substance limits
• Phthalate-free certification for children’s leisure items

Typical usage ratio

• 75%–90% EVA; adjusted for hardness requirements, with remaining share taken by crosslinkers, foaming agents, anti-UV or anti-slip additives as required by application

Downstream process integration

• Compounded, then sheet-extruded or compression-molded; foaming and crosslinking occur simultaneously during batch oven processing, resulting in closed-cell or semi-closed-cell foam structures

Final product types

• Yoga mats
• Swimming kickboards
• Martial arts floor mats
• Children's playmat tiles