Applications of Sumitomo Chemical Sumitate H2021 EVA in Industrial Manufacturing

Sumitate H2021 EVA resin is engineered to provide targeted melt strength, flexibility, and compatibility for high-performance applications in key industrial sectors. As the direct manufacturer, we prioritize strict process consistency and documentation to support regulatory compliance and downstream productivity. Below are the principal application scenarios, each defined by specific industry standards, dose ranges, processing steps, and finished products verified in long-term commercial deployment.

1. Photovoltaic Module Encapsulation Films

Manufacturers in the solar industry select this material for the production of encapsulation films due to its high transmittance and outstanding crosslinking performance, which ensure module durability and stable power output. Production lines use this EVA grade in film extrusion, followed by lamination and crosslinking to encapsulate photovoltaic cells, providing protection against moisture ingress and physical impact. Material formulation, processing temperature, and curing cycles require strict QC to meet evolving global module standards.

Industry compliance standards

• IEC 61215: Terrestrial Photovoltaic (PV) Modules – Design Qualification and Type Approval
• IEC 61730: PV Module Safety Qualification
• UL 1703: Flat-Plate PV Modules and Panels
• TÜV SÜD/IEC global certifications for polymer encapsulants

Typical usage ratio

• Core layer composition ranges from 70%–92% EVA resin by weight
• Exact loading depends on line speed, content of crosslinking agent (usually 1.5–3.0% peroxide), and total film thickness (0.45–0.55 mm)

Downstream process integration

• Added at melt extrusion; film is drawn, cooled, and stored in rolls
• Crosslinking initiators and UV stabilizers blended during extrusion
• Post-extrusion, the film is applied over PV cells and laminated under vacuum and controlled temperature (typically 140–155°C) for 5–20 minutes depending on line setup

Final product types

• P-type and N-type crystalline silicon photovoltaic modules
• Thin-film photovoltaic modules
• Bifacial solar panels with transparent backsheet
• Building-integrated photovoltaic (BIPV) glass panels

2. Hot Melt Adhesives for Packaging and Bookbinding

In industrial adhesive compounding, flexible grades of EVA are favored for blending with rosins and waxes to engineer hot melt adhesives used in automated packaging and high-volume bookbinding. Producers incorporate this material for its fast-setting, non-brittle bonds, crucial for high-speed case sealing and book spine assembly operations. Precise dosage adjustments depend on substrate porosity, required open time, and shear resistance thresholds validated by QC protocols.

Industry compliance standards

• FDA 21 CFR 175.105: Adhesives for Indirect Food Contact Applications
• REACH—Annex XVII and Regulation (EC) No 1907/2006 for chemical safety
• ASTM D1876: Peel Resistance of Adhesives
• ISO 22095: General Chain of Custody requirements for adhesives in packaging

Typical usage ratio

• Component content spans 28%–45% by total adhesive mass
• Blending ratio varies with required viscosity (1,200–2,500 cps at 180°C) and compatibility with paraffin waxes or tackifiers

Downstream process integration

• Blended in heated mixing tanks, with temperature control at 145–180°C to prevent premature crosslinking or volatilization
• Dispensed onto substrates via roll, nozzle, or slot applicators on automated lines
• Rapid transition from liquid to solid occurs in seconds for efficient assembly

Final product types

• Corrugated carton and case sealants
• Spine glues for perfect-bound books and magazines
• PVC or OPP film laminating adhesives
• Labelling adhesives for bottles and consumer packaging

3. Foamed Shoe Sole Compounds (Injection and Compression Molding)

Producers of athletic and lifestyle footwear use EVA for foamed midsole and outsole applications, leveraging its process stability, elasticity, and fatigue resistance under repeated mechanical stress. Technical teams fine-tune particle size dispersion, cell structure, and crosslink density during injection or compression molding, customizing product properties based on sports function and design trends, while meeting both global and brand-driven compliance mandates.

Industry compliance standards

• ISO 20871: Footwear – Test Methods for Outsole Durability
• REACH—SVHC content restrictions
• GB/T 15107-2013: China National Standard for Sports Shoes
• OEM and brand quality audit protocols (Nike, Adidas, etc.) for raw material traceability

Typical usage ratio

• Primary formulation contains 55%–70% EVA by weight
• Foaming agent loading (azodicarbonamide, sodium bicarbonate) and filler ratios (talc, calcium carbonate) are adjusted per density target, typically 0.18–0.32 g/cm³

Downstream process integration

• EVA pellets dry-blended with additives and coloring agents in mixing hoppers
• Material injected or placed in preheated molds at 160–175°C, with foaming agent decomposition monitored by cycle control
• Demolding and trimming occurs after controlled cooling

Final product types

• Lightweight midsoles for running, walking, and basketball shoes
• Outsoles for casual, work, and children’s footwear
• Sandals and flip-flop soles with textured surface finishes

4. Wire and Cable Insulation Compounds

The electrical and electronics sectors adopt flexible EVA resins for low-voltage cable insulation, where the polymer’s dielectric stability, heat resistance, and flame retardant performance can be engineered to meet specific product requirements. Compounding lines introduce relevant additives to build compliant insulation grades while controlling melt index for uniform extrusion, supporting reliable downstream cable performance under mechanical stress and voltage load.

Industry compliance standards

• IEC 60502-1: Power Cables with Extruded Insulation
• UL 62 & UL 758: Flexible Cord and Appliance Wiring
• RoHS Directive 2011/65/EU: Restriction of Hazardous Substances
• GB/T 2951.12: Electrical Cable Insulation and Sheath Material Specifications

Typical usage ratio

• EVA loading generally ranges from 38%–65% in cable compound blends
• Flame retardants (ATH, magnesium hydroxide) and antioxidants added by weight to reach V-0 or V-2 UL 94 classifications

Downstream process integration

• Mixed with mineral fillers, stabilizers, and fire retardants in precision kneaders
• Compounded blend pelletized; then melt-extruded onto copper or aluminum wire in continuous insulation lines at 120–140°C
• Cooling, diameter control, and spark testing to verify insulation integrity

Final product types

• Building wire and power cords (300–600 V applications)
• Flexible appliance wiring and harness assemblies
• Low smoke zero halogen (LSZH) cable jackets

5. Film Casting for Greenhouse Coverings & Agricultural Mulch Films

In agricultural film manufacturing, this resin supports the production of highly transparent, flexible films with tailored UV blocking for seasonal crop protection, improved light diffusion and resistance to agrochemical exposure. Producers adjust formulation to optimize film tensile strength, elongation, and optical properties to meet regional standards while minimizing greenhouse energy loss or promoting early harvest yields.

Industry compliance standards

• EN 13206: Plastics – Agricultural Film for Use in Agriculture and Horticulture
• GB/T 13735-2017: Chinese Standard for Polyolefin Agricultural Films
• REACH/EC 2018/2005 for chemical additives
• ISO 4892: Plastics – Methods of Exposure to Laboratory Light Sources

Typical usage ratio

• EVA incorporation between 12%–22% by weight depending on target flexibility and anti-fog performance
• Blending adjusted by climate region and additive (UV absorber, anti-drip) selection

Downstream process integration

• Pellet blending in gravimetric feeders; melt-cast film lines with cooling roller control for thickness uniformity
• Co-extrusion for multi-layer film construction (EVA inner or outer layer)
• In-line or batch slitting for end-width customization

Final product types

• Greenhouse and high-tunnel covering films (single and multi-year durability)
• Agricultural mulch films for crop rows
• Silage wrap and horticultural bagging films