Applications of LOTTE Chemical SEETEC VL830 EVA in Industrial Manufacturing

Our SEETEC VL830 Ethylene Vinyl Acetate (EVA) resin supports critical functions in key industrial sectors. With controlled VA content and precise melt flow, this grade provides tailored properties necessary for demanding process requirements. Below are detailed application routes, compliance expectations, process considerations, and resulting products from core downstream industries.

1. Photovoltaic Encapsulant Sheet Manufacturing

Leading module makers employ VL830 as a principal resin for encapsulation sheets that protect solar cells. The material's balanced VA percentage ensures high transparency and reliable crosslinking during lamination. Sheet producers depend on its process stability to prevent browning, guarantee electrical insulation, and secure long-term weathering resistance required in power generation environments.

Industry compliance standards

• IEC 61215: Terrestrial photovoltaic (PV) module qualification
• UL 1703: Safety standards for flat-plate PV modules
• RoHS Directive (2011/65/EU): Hazardous substance limits
• ISO 9001:2015 Quality Management System

Typical usage ratio

• Typically forms 60–100% of encapsulant sheet formulation, depending on the crosslinker and additive system. Loading adapts for clarity and crosslinking speed requirements of the specific line.

Downstream process integration

• Resin is first melt-extruded with stabilizer and crosslinking additives to form sheets of 0.2–0.5 mm. Sheets further pass through roll mills and are cut to module size. During lamination at 140–160°C, the core EVA matrix crosslinks and encapsulates the cell assembly, finalizing photovoltaic module assembly.

Final product types

• PVB-free solar cell encapsulant films
• Photovoltaic modules for rooftop & utility-scale solar plants
• Flexible PV panels for building-integrated photovoltaic (BIPV)
• Transparent backsheets for specialized cell architectures

2. Hot Melt Adhesive Formulation

Adhesive compounders value VL830 for its controlled MFR and acetate content, granting quick open time and effective bonding performance in hot melt glues. In packaging, woodworking, and bookbinding lines, formulated hot melts must balance thermal stability and adhesion, especially under cyclic load and variable substrate conditions. Reliable pellet uniformity assures consistent output in automated mixing and extrusion systems.

Industry compliance standards

• FDA 21 CFR 175.105: Adhesives for indirect food contact (for packaging)
• REACH (EC 1907/2006): SVHC content management
• ISO 14001:2015 Environmental Management System
• ASTM D1876: Peel resistance test for adhesives

Typical usage ratio

• Comprises 25–45% of the base polymer phase in hot melt adhesive formulations. Ratio adjusts with wax (10–35%) and tackifier (15–40%) content according to end-use viscosity and adhesion strength needs.

Downstream process integration

• Pellets enter a heated mixer where compounding with waxes, resins, and functional additives occurs at 120–170°C. The homogeneous melt is either extruded or granulated, followed by packaging as blocks, pillows, or sticks tailored for the customer’s application equipment.

Final product types

• Hot melt glue sticks for manual and automatic applicators
• Case & carton sealing adhesives for food and beverage packaging
• Bookbinding adhesives for PUR replacement applications
• Edge bonding solutions for engineered wood products

3. Wire & Cable Compound Production

Manufacturers of insulation and sheath compounds require EVA resins with defined melting profiles and low gel content. VL830 offers stable processing, reliable dielectric properties, and compatibility with flame retardant packages for low-voltage power and data cable constructions. Formulators appreciate its ability to meet insulation thickness and elongation performance targets, crucial for durable and safe cable products.

Industry compliance standards

• UL 1581: Reference standard for electrical wires and cables
• IEC 60502: Power cables with extruded insulation
• RoHS Directive (2011/65/EU): Hazardous substances in electrical equipment
• EN 50363: Insulating, sheathing and bedding compounds

Typical usage ratio

• Represents 30–60% of compound mass, balanced by plasticizers, flame retardants (ATH, magnesium hydroxide, etc.), pigment, and processing aids. Proportion fine-tuned for target tensile and elongation values.

Downstream process integration

• Applied via twin-screw compounding extrusion alongside fillers and masterbatches. The compounded pellets are fed into cable extrusion lines to form insulation or sheathing layers on cooper/aluminum conductors. Finished cables pass continuous vulcanization or direct cooling before winding and storage.

Final product types

• Low-voltage power cable insulation
• Fire-retardant, halogen-free sheaths for building wiring
• Control and instrumentation cable jackets for oil & gas
• Data cable compounds for telecom and automotive harnesses

4. Footwear Injection and Foamed Sole Applications

Footwear producers utilize this EVA grade as the primary elastomer for molded sports soles and flip-flop base materials. The VA content enables enhanced flexibility and comfort characteristics while supporting microcellular expansion for lightweight profiles. Consistent bead morphology contributes to predictable filling behavior in both direct injection and compression molding of midsoles and outsoles.

Industry compliance standards

• ISO 20344: Personal protective equipment - test methods for footwear
• REACH Annex XVII: Phthalates and restricted substances
• GB 30585: Footwear product safety (China export routes)
• EN 14682: Laces and cords safety (children's footwear)

Typical usage ratio

• Constitutes 35–75% of total polymer content in foamed and solid EVA soles. Loading level customizes density and resilience according to target application, often with fillers (calcium carbonate) and blowing agents (3–9%).

Downstream process integration

• Compounders mix base resin with performance enhancers, pigments, and chemical foaming agents in internal mixers or twin-screw extruders. The plastified mass is pelletized, then batch-fed to injection, compression, or direct foaming lines. Post-mold curing optimizes physical properties prior to final trimming and inspection routines.

Final product types

• Midsoles for athletic and lifestyle footwear
• Flip-flop and sandal base units
• Orthopedic insoles requiring shock absorption
• Industrial safety boot inner soles

5. Film Blowing and Packaging Film Conversion

Film processors looking for clarity, low sealing temperature, and enhanced softness deploy this EVA grade in both coextruded and monolayer applications. VA functionality affords tight sealing, impact resistance, and elevated tear strength for packaging that requires both functional integrity and product visibility. Process consistency guarantees minimal fish eyes and homogeneous gauge, meeting high-throughput film extrusion demands.

Industry compliance standards

• FDA 21 CFR 177.1350: EVA polymers for food contact films
• EN 1186: Material and articles in contact with foodstuffs - plastics
• REACH (EC 1907/2006): Restriction compliance for packaging plastics
• ISO 22000: Food safety management (entity packing operation may certify)

Typical usage ratio

• Used as 5–25% modifier in LDPE or LLDPE blends for coextruded film, or as the base polymer (70–100%) for specialized stretch and shrink films. Formula adapts to gauge, shrink behavior, and targeted seal initiation temperature for the finished packaging line.

Downstream process integration

• Resin feeds into high-speed blown or cast film equipment, often with slip, antiblock, and color masterbatch additives. Melt blends extrude through annular or flat die heads, with downstream winders and slitter-rewinders controlling final roll goods dimensions. Inline corona treatment improves printability and lamination adhesion as required.

Final product types

• Food and non-food shrinkwrap films
• Hygiene pad and medical packaging films
• Low-seal temperature bags and pouches
• Coextruded film for fresh produce wrapping