Applications of Sinopec Yangzi 2825DV EVA in Industrial Manufacturing

Sinopec Yangzi 2825DV EVA serves various demanding industries where controlled flexibility, adhesion, and chemical resistance are critical to consistent downstream product quality. Below are key industrial sectors utilizing this grade, including application-specific compliance, compounding practices, production methods, and their typical end products.

1. Photovoltaic Encapsulation Sheets

EVA copolymer remains a standard material in the lamination of photovoltaic (PV) modules due to its flexibility and adhesion to glass, silicon wafers, and backsheet polymers. Manufacturers use 2825DV EVA pellets for their transparency, crosslinkability, and controlled VA content, which assure reliable module performance under UV exposure and severe climates.

Industry compliance standards

• IEC 61215 (Crystalline silicon terrestrial PV modules—Design qualification and type approval)
• IEC 61730 (PV module safety qualification)
• TUV Rheinland PV testing protocols
• RoHS Directive (for hazardous substances restriction in electrical equipment)

Typical usage ratio

• Formulators use 2825DV EVA at 75–90% of total sheet mass, balancing with curing agents and UV stabilizers. VA content and melt index directly affect crosslinking speed and glass adhesion; formulations get adjusted per line speed and climatic exposure ratings.

Downstream process integration

• Producers feed EVA resin into twin-screw extrusion, film casting calendars, or blown film lines. They add crosslinking and stabilizing additives in-line or by masterbatch. Sheet rolls then enter lamination lines, where heat and pressure complete crosslinking.

Final product types

• PV module encapsulant films
• Solar panel composite sheets
• LED lighting protective layers (secondary sector)

2. Hot Melt Adhesives (HMA)

EVA-based hot melt adhesives constitute key feedstock for packaging, woodworking, automotive assembly, and electronics. The 2825DV grade delivers controlled melting points, appropriate viscosity, and mechanical performance demanded by automated dispensing and rapid bond setting lines.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for food packaging contact—where applicable in primary packaging)
• ISO 9001:2015 (Quality management for industrial adhesives production)
• ASTM D1876 (Peel resistance of adhesives)
• GB/T 2793 (Chinese standard for adhesives for packaging)

Typical usage ratio

• EVA forms 30–60% of hot melt base; formulators combine with waxes, tackifiers, plasticizers, and antioxidants. EVA content varies depending on viscosity target, bond strength, and required open time. Customers adjust ratios based on substrate porosity and dispensing temperature.

Downstream process integration

• Mixing systems introduce EVA resin and co-additives into jacketed mixers or extruders. Molten compound gets pelletized or directly loaded into block molds, granulators, or hot fill lines, then cooled. Large users feed pellets into hot glue gun hoppers or slot coaters.

Final product types

• Bookbinding glues
• Cardboard and corrugated case adhesives
• Automotive trim bonding adhesives
• Disposable hygiene product assembly glues

3. Wire and Cable Insulation Compounds

Compounders utilize EVA as a key polymer in flexible wire and cable jackets for low- and medium-voltage applications. The resin ensures improved flexibility at low temperatures, excellent processability in extrusion, and electrical insulation stability.

Industry compliance standards

• UL 1581 (Reference standard for electrical wires, cables, and flexible cords)
• IEC 60502 (Power cables with extruded insulation and their accessories)
• REACH (Regulation for Registration, Evaluation, Authorization and Restriction of Chemicals)
• RoHS (Restriction of Hazardous Substances Directive)

Typical usage ratio

• Processors use EVA at 40–85% in cable compounds, blended with inorganic fillers (ATH for flame retardancy), plasticizers, and stabilizers. Adjustments depend on cable flexibility, flame retardancy classes (e.g., FR-PE/EVA blends), and extrusion temperature limits.

Downstream process integration

• EVA pellets blend in high-shear mixers or compounding extruders with flame retardants and process aids. Melt compound is pelletized or output directly to cable extrusion lines, where insulation or sheathing gets extruded and cooled over conductor wires.

Final product types

• Building and automotive wire insulation
• Flexible control cable jackets
• Underground or outdoor power cable sheathing
• Data cable primary insulation layers

4. Foam Injection and Sheet Products

EVA serves as a primary resin in crosslinked and non-crosslinked foam production, offering cushioning properties for sports, medical, footwear, and packaging goods. The 2825DV grade allows controlled density, resilience, and processing over a wide thermal range.

Industry compliance standards

• EN 71-3 (Safety of toys—Migration of certain elements, applicable for children’s foams)
• ISO 20344 (Personal protective equipment – Test methods for footwear materials)
• GB 4806.7 (National food-contact material standard, where EVA foam is used for packaging foodstuffs)
• Oeko-Tex Standard 100 (Textile and footwear foam safety certification)

Typical usage ratio

• EVA content ranges from 45% (for blended foams with PE or natural rubber) to near 100% for single-polymer foams. Content and cell structure vary with foaming agents, crosslinking aids, and filler use, adjusted to meet compression, resilience, and safety test results.

Downstream process integration

• Mixers combine EVA resin with blowing agents, colorants, and crosslinkers. Molding presses, extrusion lines, or continuous laminators shape the foam. Thermal ovens or steam autoclaves initiate crosslinking and develop cell structure.

Final product types

• Sports mats and yoga pads
• Protective packaging inserts
• Shoe soles and midsoles
• Medical braces and orthopedic supports

5. Flexible Film and Sheet Manufacturing

EVA resins enable production of transparent, flexible film for packaging and agricultural sheeting. Processors rely on its impact resistance, clarity, and sealing characteristics for food, pharmaceutical, and industrial uses where durability and low-temperature flexibility are priorities.

Industry compliance standards

• FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers—food-contact compliance)
• EU No 10/2011 (Plastic materials and articles intended to come into contact with food)
• GB 9685 (Additives used in food contact materials in China)
• ISO 22000 (For processors of food packaging film)

Typical usage ratio

• Film formulations use 25–60% EVA as a co-polymer component, with LDPE, LLDPE, or other co-polymers. EVA content adjusts film flexibility, clarity, and shrink properties. Adjustment by film thickness, product type, or sealing strength requirements.

Downstream process integration

• Film plants feed EVA pellets into single- or multi-layer blown film extruders or cast film lines. They incorporate additives for slip, antiblock, and anti-fog properties. Integrated chill rolls or bubble towers handle continuous sheeting and winding.

Final product types

• Food and pharmaceutical packaging films
• Agricultural mulch and greenhouse films
• Medical device overwraps
• Industrial shrink sleeves