Applications of LOTTE Chemical SEETEC VC640 EVA in Industrial Manufacturing

SEETEC VC640 EVA, produced by LOTTE Chemical, features distinguished vinyl acetate content and reliable melt flow rate, making it suitable for a tightly defined set of industrial sectors. Below, we specify key downstream application routes, highlighting regulatory compliance, realistic formulation guidance, process positioning, and supported final goods for each segment.

1. PV Encapsulant Films for Solar Module Manufacturing

Solar module producers heavily rely on VC640 EVA for encapsulant film extrusion and lamination processes due to its proven clarity, adhesion, and long-term reliability. The polymer supports electrical insulation and weatherability standards essential for photovoltaic field installation. SEETEC VC640 consistently meets demanding criteria for standard solar module stability after prolonged UV exposure and field cycling, providing manufacturers with long-term performance assurance. Typical production integrates pellet compounding with stabilizers and crosslinkers, followed by flat-die extrusion and subsequent lamination under temperature and pressure conditions.

Industry compliance standards

• IEC 61215 (Crystalline silicon terrestrial PV modules—Design qualification and type approval)
• UL 1703 (Flat-plate photovoltaic modules and panels, US market)
• IEC 61730 (PV module safety qualification)
• RoHS Directive 2011/65/EU compliance for hazardous substance limitation

Typical usage ratio

• Base encapsulant film formulation: 60–75 wt% EVA resin, adjusted for thickness, crosslinking agent dosage, and co-additives based on module design and lamination conditions

Downstream process integration

• High-temperature extrusion as the principal input resin, compounded directly with UV absorber, crosslinker (e.g., peroxide), and antioxidants into flat films; films then assembled between glass and cells, post-cured by lamination cycle at 140–160°C for 10–20 min

Final product types

• Punched or rolled EVA encapsulant sheets
• Integrated solar panels for commercial or residential photovoltaic installations
• Bifacial and double-glass module formats

2. Hot Melt Adhesives for Packaging and Bookbinding

Packaging, woodworking, and print finishing factories benefit from the blend compatibility and rapid setting of VC640 EVA resin in hot melt adhesive formulations. The raw granulate is typically blended with waxes and tackifiers for targeted performance in heat-activated glue sticks and bulk adhesives. Industry-specific QA demand clarity, high adhesion to paper and plastic, and thermal stability across high-speed production lines. Processing incorporates gravimetric compounding and in-line extruder feeding for on-site adhesive block molding.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives, indirect food contact—US packaging)
• REACH Regulation (EC) No. 1907/2006 compliance for chemical safety in the EU
• EN 923 (Adhesives—Terms and definitions)
• BfR XXI Recommendations for food packaging adhesives (Germany)

Typical usage ratio

• 30–45 wt% in hot melt adhesive base, calibrated based on viscosity target, open time, and substrate affinity; adapted through laboratory tack and cohesion tests specific to process speed

Downstream process integration

• Melting and blending with tackifiers and wax in jacketed mixers; the formulated mass is then pelletized, extruded, or directly filled into adhesive cartridges or blocks, followed by QC for set time, bond strength, and color

Final product types

• Hot melt glue sticks for industrial and consumer use
• Hot melt spine adhesives for bookbinding
• Hot melt pillow adhesives for case and carton sealing automation lines

3. Wire & Cable Sheathing Compounds

Wire and cable insulation compound producers use VC640 EVA as a critical matrix due to its flame retardancy and flexible processing in low-smoke, halogen-free formulations. These compounds satisfy stringent cable industry certification for environmental, fire safety, and dielectric properties. Controlled blending with mineral flame retardants and process stabilizers ensures consistent pellet compounding fit for extrusion onto copper or aluminum conductors.

Industry compliance standards

• IEC 60502 (Power cables with extruded insulation and their accessories)
• EN 50268-2 (Measurement of smoke density of cables burning under defined conditions)
• UL 1581 (Electrical wires, cables, and flexible cords)
• RoHS Directive 2011/65/EU

Typical usage ratio

• 40–65 wt% EVA based on flame retardant filler type, particle loading, and intended mechanical flexibility as tested per client cable thickness and bend radius specifications

Downstream process integration

• Melt compounding with submicron ATH/Mg(OH)2 fillers, processing aids, and colorants in high-speed twin-screw extruders, followed by pelletizing; subsequent extrusion onto conductor core during finished cable jacketing operations

Final product types

• Halogen-free flame-retardant (HFFR) sheathing granules
• Low-smoke zero-halogen (LSZH) cables for building, transit, and utility wiring
• Insulation layers in low voltage and signal cables

4. Foam Soles for Footwear Manufacturing

Footwear and sports gear manufacturers utilize VC640-grade EVA in closed-cell foam sheet extrusion, exploiting its uniform expansion and shock absorption properties. The raw resin is integrated in compounded batches with foaming agents and pigments to create soles with dependable resilience and non-marking characteristics, supporting end-products marketed under major footwear brands for athletic and leisure use. Process lines routinely check expansion ratio, hardness, and compression set to ensure batch consistency.

Industry compliance standards

• ISO 20344 (Personal protective equipment—Test methods for footwear)
• EN 13632 (Safety, protective, and occupational footwear manufacturing guidelines)
• SATRA TM144 and TM77 (Resilience and abrasion resistance)
• REACH Regulation (EC) No.1907/2006 for consumer products

Typical usage ratio

• 65–85 wt% EVA resin basis in foam formulations; adaptation governed by density and flex target, foaming agent efficacy, and performance per finished sole thickness

Downstream process integration

• Batch mixing with AC/azodicarbonamide blowing agents, colorants, crosslinkers; sheet extrusion at 120–150°C, followed by steam or hot-air foaming expansion and die-cutting to required insole/sole shapes

Final product types

• Injection-molded or compression-molded EVA midsoles for running and casual shoes
• EVA outsoles for sandals, slippers, and safety footwear
• Sheet foam for sports gear padding and children’s activity mats

5. Film Blowing for Agricultural and Industrial Film

Producers of co-extruded agricultural and protective industrial films value VC640’s balance of flexibility and tensile strength. This specification supports uniform film thickness, controlled bonding, and environmental resistance, which are required by large-scale greenhouses, tunnel coverings, and packaging. During blend formulation, operators tailor resin proportions based on film gauge, UV stabilizer load, and desired elongation behavior, confirming output in continuous film blowing, slitting, and reel-winding lines.

Industry compliance standards

• EN 13206 (Plastic covering for agricultural soil)
• ASTM D882 (Standard test method for tensile properties of thin plastic sheeting)
• IS 2508 (Specification for polyethylene films and sheets, India)
• OEKO-TEX Standard 100 for agricultural/non-food applications

Typical usage ratio

• 10–30 wt% EVA in LDPE/EVA blend films, with dosage set by targeted mechanical flexibility, clarity, and cold resistance per field service application

Downstream process integration

• Pre-blending with LDPE and additives, then continuous feed to blown film extrusion lines; dosage adjusted dynamically to account for summer/winter film gauge tolerances and UV masterbatch incorporation

Final product types

• Greenhouse and mulching films
• Moisture-resistant packaging films for food and industrial products
• Surface protective films for construction, glass, or surface transport