Applications of LOTTE Chemical SEETEC VS420 EVA in Industrial Manufacturing

LOTTE Chemical SEETEC VS420 EVA features high vinyl acetate content and consistent melt flow, supporting multiple manufacturing areas. As a manufacturer, we ensure traceable batch quality, documented performance, and technical adaptation for specific industrial processing lines. Below, we outline principal application scenarios with detailed compliance, formulation, process, and finished product information.

1. Hot Melt Adhesive (HMA) Compounding for Packaging & Bookbinding

This material forms the base copolymer in industrial hot melt adhesive preparations, enabling rapid setting and reliable adhesion in case and carton sealing, as well as book spine gluing. End-users blend the resin with tackifiers, waxes, and stabilizers to achieve performance tailored for automated packaging lines and high-speed bookbinding machines. Processing requires precise control of viscosity and open time, proven through continuous extrusion or slot die application.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives, indirect food contact)
• REACH Regulation (EC) 1907/2006
• RoHS Directive 2011/65/EU
• ISO 9001:2015 certified manufacturing process support

Typical usage ratio

• 35–55% of adhesive blend by weight
• Adjusted for desired softening point and bond strength
• High vinyl acetate percentage tailored for flexible substrates
• Formulators adapt ratio based on paper, cardboard, or synthetic substrate

Downstream process integration

• Premixed with tackifiers and wax components
• Melted and homogenized in jacketed blending tanks
• Supplied to applicators via heated hoses and tanks
• Applied directly by roller, spray, bead, or slot die techniques

Final product types

• Hot melt adhesives for food packaging sealants
• Industrial case and carton adhesives
• Perfect binding adhesives for book spines
• Resealable envelope glues

2. Wire and Cable Grade Compound Manufacturing

Downstream cable insulation compounders use this EVA as the main polymer for low-voltage wire, control cable, and signal cable insulation. Formulations require consistent melt strength, high elongation, and electrical resistance. Production lines employ twin-screw extrusion at elevated temperatures, combining the resin with antioxidants, fillers, and fire retardants. The resulting compounds ensure safe and stable dielectric properties during cable sheathing and jacketing.

Industry compliance standards

• UL 758 (Appliance Wiring Material)
• IEC 60502-1 (General cable construction requirements)
• RoHS 2011/65/EU and REACH Directive
• EN 50363 (Insulating compounds for cables)

Typical usage ratio

• 45–65% of cable compound formulation
• Adjusted based on filler and fire retardant level
• Higher polymer ratio increases flexibility
• Optimized per target insulation thickness

Downstream process integration

• Main polymer feed for extruder hoppers
• Compounded with Mg(OH)₂ or ATH flame retardants, processing aids
• Pelletized and cooled post-extrusion
• Converted to insulation layers on cable jacketing lines

Final product types

• Low-voltage power cable insulation
• Flexible appliance cords
• Automotive signal cable sheaths
• Data and coaxial cable insulation

3. Solar Encapsulant Film for Photovoltaic Modules

EVA serves as the core resin for solar module encapsulant film, providing strong lamination, UV resistance, and electrical insulation. Film producers rely on this grade for bubble-free and stable co-extrusion into uniform sheets, which they crosslink during module lamination. The material’s clarity supports high light transmittance, essential for photovoltaic cell efficiency. Controlled gel content and defined melt index help ensure predictable module performance.

Industry compliance standards

• IEC 61215 (Crystalline silicon photovoltaic modules)
• IEC 61730 (Module safety qualification)
• TÜV Rheinland standards for solar panel materials
• ISO 14001:2015 for environmental control

Typical usage ratio

• 85–95% of encapsulant film composition
• Small portion replaced by UV/thermal stabilizers
• Crosslinking agent addition ≤3% for cured film
• Film thickness 0.45–0.55 mm as per module design

Downstream process integration

• Pellets fed into single or multi-layer film extrusion lines
• Inline mixing of crosslinker and UV absorbers
• Film winding under controlled humidity
• Applied between glass and photovoltaic cells during lamination

Final product types

• Solar module encapsulant films
• Backsheet adhesive layers for PV
• Module edge sealing strips
• Flexible thin-film PV device encapsulants

4. Foam Slipper and Midsole Injection for Footwear Production

The resin is a primary component in elastomeric foam compounding for slippers, sandal soles, and midsoles. Blending with blowing agents and crosslinkers, it achieves soft yet durable foam structures with required rebound and compression set. Production involves sheet extrusion followed by chemical crosslinking and physical foaming, then molding or die-cutting. Material choices follow footwear and consumer health regulations for both children and adults.

Industry compliance standards

• EN ISO 20345/20347 (Safety and occupational footwear)
• GB 30585-2014 (China children’s footwear safety standard)
• REACH Regulation (SVHC for phthalate limits)
• US CPSIA for lead and phthalate in children’s articles

Typical usage ratio

• 60–85% of foam formulation
• Blowing agent in range of 3–8%
• Crosslinking aid (DCP or similar) at 0.5–2%
• Ratio adapted based on required hardness and density

Downstream process integration

• Compounded with foaming and coloring agents in batch mixers
• Extruded to continuous sheets or injected into closed molds
• Heat treatment completes crosslinking and foaming
• Final cutting or compression molding shapes the outsole or insole

Final product types

• Injection-molded slippers and sandals
• Sporting shoe midsoles and outsoles
• Children’s foam footwear
• Mass-market beach sandals and flip-flops

5. Polymer Modification in Flexible Film Blown Packaging

This material enters as a blend component in multilayer film extrusion for flexible food packaging, stretch wrap, and laminating films. Its inclusion improves tear resistance, clarity, and sealability of PE-based films. Compounders manage precise addition rates based on gauge control, mechanical properties, and customer forming requirements. The resin integrates seamlessly on mono or multi-layer blown film lines, offering stable bubble expansion and consistent film output.

Industry compliance standards

• FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers, food contact)
• EU 10/2011 (Plastics intended to contact food)
• ISO 22000 for food safety management during processing
• China GB 9685 (Use of additives in food-contact materials)

Typical usage ratio

• 3–18% of base polymer blend
• Higher rates for improved low-temperature seal performance
• Lower end used for clarity and anti-blocking in general films
• Ratio adjusted line-by-line by film extrusion operators

Downstream process integration

• Dry blending with LDPE/LLDPE pellets pre-extrusion
• Uniform melting and homogenization in blown film hoppers
• Co-extruded with other functional barrier layers as needed
• Film rolled and slit to customer gauge and width

Final product types

• Food wrap and vacuum pouches
• High-clarity laminating film
• Surface protection films
• Flexible bag and pouch stock