Applications of LOTTE Chemical SEETEC VA920 EVA in Industrial Manufacturing

LOTTE Chemical SEETEC VA920 EVA delivers specialized benefits in industrial manufacturing where precise mechanical properties, adhesion, flexibility, and film-forming capabilities are essential for end-use performance. As an original manufacturer, we supply this grade to downstream producers who require high-performance and compliance in formulation-critical sectors. Below, we detail dedicated application scenarios, each with specific integration notes and compliance practices.

1. Solar Panel Encapsulation Films

Solar module manufacturers rely on VA920 for encapsulation film production, leveraging its consistent melt flow and high vinyl acetate content to achieve superior light transmittance and long-term stability under UV exposure. The grade’s combination of flexibility, adhesion, and thermal stability ensures minimal delamination risk throughout module service life, supporting downstream efficiency and strict international photovoltaic regulations during lamination processes.

Industry compliance standards

• IEC 61215:2016 (Crystalline silicon terrestrial PV modules - Design qualification and type approval)
• UL 1703 (Flat-Plate Photovoltaic Modules and Panels)
• TÜV SÜD PV Module Certification

Typical usage ratio

• Used at 100 wt% in the encapsulant film core; additive levels adjust only for UV stabilizers and crosslinking agents (typically 1–3%) based on module design and climate durability requirements.

Downstream process integration

• Gravity feeding or extruder dosing during EVA film extrusion; granule conversion via cast or blown film line; lamination with glass and backsheet under controlled temperature-pressure for crosslinking.

Final product types

• Pv encapsulation film rolls
• Finished photovoltaic modules for residential, commercial, and utility-scale solar installations

2. Hot Melt Adhesives for Packaging & Hygiene Products

Producers of hot melt adhesives use VA920 for its capacity to impart high initial tack, flexibility, and sustained bond strength required for automated packaging and hygiene disposables. This is especially relevant for adhesives in diaper assembly and case & carton sealing, where migration, odor, and heat resistance must be controlled in line with food contact and skin contact regulations.

Industry compliance standards

• FDA CFR 175.105 (Adhesives - indirect food additives)
• EU 10/2011 (Plastic materials and articles intended to come into contact with food)
• ISO 10993-5 (Cytotoxicity for medical device adhesives, where applicable for hygiene)

Typical usage ratio

• Formulation loading ranges from 25–40 wt% EVA copolymer in base adhesive depending on target open time, flexibility, and peel strength; waxes and tackifiers balance performance for specific end-use and line speed.

Downstream process integration

• Melt blending in hot melt reactors; EVA introduced with resin and liquid components at 120–180°C until homogeneous; finished adhesive pelletized or filled into drums/blocks for end-user melting equipment.

Final product types

• Hot melt adhesive sticks and pillows for packaging automation
• Pressure-sensitive adhesives for baby diapers, sanitary napkins, and medical drapes
• Case and carton closing adhesives for food and beverage packaging

3. Wire & Cable Insulation Compounds

Cable compounders select VA920 for thermoplastic and crosslinked insulative layers on low- and medium-voltage wires requiring high flexibility, insulation, and environmental stress crack resistance. The material processes smoothly for pelletizing and cable jacketing, securing compliance for domestic and exportgrade building cables, and performance integrity over long-term field service.

Industry compliance standards

• UL 1581 (Electrical Wires, Cables, and Flexible Cords - Reference Standard)
• IEC 60228 (Conductors of Insulated Cables)
• RoHS directives (Restriction of Hazardous Substances)

Typical usage ratio

• 55–70 wt% EVA in insulation compound masterbatches, adjusted for filler and flame retardant levels; variation depends on voltage class, physical property targets, and cable standards.

Downstream process integration

• EVA introduced in Banbury or twin-screw extruder with flame retardant fillers and plasticizers; compound pelletized before extrusion onto copper/aluminum wire using crosshead extrusion; potential post-crosslinking via irradiation or silane-grafting where specified by cable type.

Final product types

• Insulated power cables (building wire, flexible cords)
• Control and data transmission cables for industrial and telecom
• Appliance wiring materials

4. Footwear Injection Molding for Foam Soles

Global footwear brands integrate VA920 into foam sole formulations, benefiting from resilient cushioning, anti-slip, and shock absorption properties. Its processability at low temperature and high flexibility provides performance and comfort for sport and casual shoes, passing durability and phthalate compliance in regulated export markets. QC monitoring during compounding ensures consistent foam cell morphology.

Industry compliance standards

• REACH Regulation (EC) No 1907/2006 (restrictions on harmful substances)
• ISO 20871:2018 (Footwear — Test methods for outsoles)
• CPSIA (Consumer Product Safety Improvement Act, for children's footwear)

Typical usage ratio

• 60–80 wt% EVA based on sole density and rebound targets; blowing agent, pigment, and crosslinker levels fine-tuned for targeted expansion ratio and hardness by application (casual, sports, safety).

Downstream process integration

• Batch mixing of EVA granules with additives and foaming agent; compounds pelleted, then injection-molded or compression-molded; crosslinking stage activated in-mold or post-mold, depending on grade and cell size desired.

Final product types

• Midsoles and outsoles for athletic shoes, sandals, children’s footwear
• Anti-fatigue insoles and orthotic shoe components

5. Film and Sheet for Greenhouse Covers

Producers of agricultural films use VA920 as a key resin to achieve high light diffusion, tear strength, and durability while meeting chemical resistance needs for prolonged outdoor exposure. The material enables customizable formulation to satisfy the unique requirements of greenhouse growers in different climates, and certification ensures safety in food-crop contact scenarios.

Industry compliance standards

• EN 13206:2017 (Plastic covering for use in agriculture and horticulture — Specifications for plastic films)
• EU 10/2011 (Plastics for food-contact agrifilms)
• ISO 4892-2 (Exposure to laboratory light sources for weathering test)

Typical usage ratio

• 35–50 wt% of total resin blend for multi-layer films; blend ratios fine-tuned against mechanical strength, transparency, and seasonal light control needs.

Downstream process integration

• Direct feeding to film extrusion lines with co-extrusion technology; blown or cast film process; layering with LDPE/LLDPE for outer mechanical or anti-drip layers; online thickness and optical monitoring during production.

Final product types

• Single-layer and multilayer greenhouse films
• Low tunnel and mulch films for vegetable and fruit production

6. Waterproofing Membrane Compounds for Construction

Building materials manufacturers incorporate VA920 to achieve flexible, high-adhesion, and weather-resistant properties in waterproofing membranes, essential for foundation, roof, and tunnel applications. The polymer’s chemical inertness and long-term plasticity offer necessary compliance for construction safety standards and environmental regulations in infrastructure projects.

Industry compliance standards

• EN 13967:2012 (Flexible sheets for waterproofing - Plastic and rubber damp proof sheets including plastic and rubber basement tanking membrane)
• ASTM D1970 (Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment)
• GB 18173.1-2012 (China national standard for waterproof materials)

Typical usage ratio

• 20–35 wt% EVA content in membrane formulations; percentage shifts according to tensile strength, elongation, and compatibility with bitumen or other resin systems.

Downstream process integration

• EVA combined with plasticizers, fillers, and stabilizers in a twin-screw compounding extruder; online calendering or extrusion of membranes; optional lamination with textile or aluminum layers; roll-to-roll packaging for on-site installation.

Final product types

• Self-adhesive waterproofing rolls for commercial roofing
• Underground waterproofing liners for tunnels, subways, and foundation works
• Pre-applied membrane systems for high-rise construction