Applications of Levima UL00728 EVA in Industrial Manufacturing

Levima UL00728 EVA is a performance ethylene-vinyl acetate copolymer designed for use in demanding industrial manufacturing environments. As the original manufacturer, we support a full spectrum of downstream applications for this grade. Below, we detail the principal industrial fields using Levima UL00728 EVA, with technical context on real-world processing and compliance expectations.

1. Photovoltaic Encapsulation Films

Manufacturers of photovoltaic modules employ Levima UL00728 EVA to produce encapsulation films critical for solar cell protection and performance. Processors value the controlled melt index and vinyl acetate content, which yield optimal transparency, crosslinking properties, and adhesive strength required for laminated module structures. Application parameters require strict raw material quality and additive compatibility to ensure stable performance under aggressive weathering and UV exposure throughout a PV module's operational life.

Industry compliance standards

• IEC 61215: Terrestrial photovoltaic (PV) modules – Design qualification and type approval
• UL 1703: Standard for Flat-Plate Photovoltaic Modules and Panels (retired in US, still referenced globally)
• RoHS Directive (2011/65/EU): Restriction of hazardous substances
• REACH Regulation (EC No. 1907/2006): Registration, Evaluation, Authorisation and Restriction of Chemicals

Typical usage ratio

• 100% base polymer for lamination layer; additives (crosslinking agents, UV stabilizers, antioxidants) 1–3% by weight customized according to cell type and module architecture.

Downstream process integration

• Direct extrusion and chill-roll casting into films, followed by roll-slitting and subsequent lamination of the solar cell arrays during module assembly. Crosslinking occurs during vacuum lamination, typically at 140–150°C for 15–20 minutes.

Final product types

• Photovoltaic encapsulation films, bifacial module films, transparent backsheet films, specialty encapsulants for flexible or building-integrated photovoltaics.

2. Hot Melt Adhesives for Bookbinding and Packaging

Levima UL00728 EVA is widely formulated into industrial hot melt adhesives, especially for bookbinding, case sealing, and carton closure operations. With carefully controlled melt flow and vinyl acetate balance, adhesive compounders achieve reliable bonding, good open time, and resistance to cracking or brittleness in cold or humid environments. Strict QC in compounding ensures compatibility with pigments, waxes, and resins necessary for automated production and rapid-consumption packaging lines.

Industry compliance standards

• FDA 21 CFR 175.105: Adhesives – safe for indirect food contact applications
• EN 923: Adhesives, terms and definitions and nomenclature
• ASTM D1876: Peel Resistance of Adhesives (T-Peel Test)
• ISO 4587: Structural adhesives – Determination of tensile lap-shear strength of bonded assemblies

Typical usage ratio

• 30–60% EVA copolymer by weight; supplemented with tackifiers (30–45%), waxes (5–20%), and process stabilizers (up to 2%). Adjusted per viscosity and adhesion requirements of the end-use substrate.

Downstream process integration

• Melting and blending in hot-melt adhesive compounding lines; granulate is supplied to bookbinding and packaging plants for application via hot melt tanks and nozzles at 160–180°C.

Final product types

• Perfect-bound book blocks, magazine spines, corrugated box closure adhesives, case and carton sealants, general packaging glues.

3. Cable and Wire Insulation Compounds

Insulated cable producers select this EVA grade for sheathing and insulation layers, benefitting from its high dielectric strength and resistance to environmental stress-cracking. Compounding lines include flame retardants, plasticizers, and stabilizers, which enable extrusion into flexible power, signal, and data cable constructions for critical electrical safety and performance applications.

Industry compliance standards

• IEC 60502-1: Power cables with extruded insulation and their accessories
• UL 62: Flexible cords and cables
• RoHS Directive (2011/65/EU): Hazardous substances in electrical products
• ISO 6722: Road vehicles – 60 V and 600 V single-core cables – Dimensions, test methods, and requirements

Typical usage ratio

• 35–55% EVA resin; balance with ATH (Aluminum Trihydrate) 40–60% for flame retardancy, plus process aids and stabilizers (up to 5%). Formulation adapted to mechanical and halogen-free fire-safety requirements.

Downstream process integration

• Pellet compounding with intensive mixers/kneaders, twin-screw extruder feeding directly to synchronized cable insulation lines, where co-extrusion or multi-layer jacketing is achieved in a single manufacturing pass.

Final product types

• Insulated power cables (low-voltage, medium-voltage), data and instrumentation wires, automotive cable insulation, flame-retardant electrical sheathing.

4. Foam Shoes and Sports Soles Manufacturing

Levima UL00728 EVA serves as a core raw material for foamed sheet and molded footwear components, providing light weight, resilience, and cushioning. Manufacturers adjust the VA content and foaming agent levels to generate cellular structures suited for midsole, outsole, and full shoe fabrication. Process controls during injection or compression molding, as well as post-expansion and cooling, define product uniformity and end-use comfort, especially required for branded sports and leisure shoes.

Industry compliance standards

• ISO 20871: Footwear – Test methods for outsoles – Abrasion resistance
• REACH Regulation (EC No. 1907/2006): Chemical safety in consumer goods
• SATRA TM144: Resilience test for footwear materials
• EN 20344: Personal protective equipment – Test methods for footwear

Typical usage ratio

• 60–95% EVA resin by weight, with 3–8% chemical foaming/blowing agents; crosslinking agents and color masterbatches up to 5%. The precise ratio balanced for expansion factor, hardness, and abrasion resistance targets.

Downstream process integration

• Sheet extrusion or injection molding; chemical or physical foaming (via expansion ovens or molds); trimming and surface texturizing; multi-component lamination with textiles or rubber may follow based on final shoe design.

Final product types

• Sports shoe midsoles, flip-flop sandals, EVA foam slippers, anti-fatigue mats, children’s molded footwear, custom orthotics.

5. Film Modification and Lamination Layers

Film processors utilize this grade to modify LDPE or LLDPE resin-based films, targeting enhanced flexibility, optic clarity, and seal strength for packaging applications. Adjusted inclusion rates ensure processability during film-blowing or cast-film operations, and also support good printability and puncture resistance without sacrificing line speed or waste control. Quality control systems focus on thickness uniformity and absence of gel or optical defects for demanding converters in food and industrial markets.

Industry compliance standards

• FDA 21 CFR 177.1350: Ethylene-vinyl acetate copolymers in food-contact films
• EU 10/2011: Plastics regulation for materials intended to contact foods
• ISO 527-3: Tensile properties of film and sheeting
• JIS K6735: Test methods for vinyl acetate copolymer films

Typical usage ratio

• 3–20% EVA, depending on target flexibility and sealing properties; blended with PE resins in multi-layer or monolayer film structures. The content is optimized for individual converter film gauge and end-use packaging lines.

Downstream process integration

• Dry polymer blending or melt-compounding prior to film-blowing or cast-film extrusion lines. Lamination layers formed via in-line extrusion; subsequent corona treatment and slit-to-width for downstream print and bag conversion.

Final product types

• Flexible food packaging films, medical packaging, shrink sleeves, industrial lamination films, freezer bag films.

6. Masterbatch and Additive Carrier Systems

Color and additive masterbatch producers use Levima UL00728 EVA as a carrier resin for pigments, UV absorbers, slip agents, and other specialty additives. The grade’s balanced melt flow allows high pigment loading with dispersion stability, essential for customer compounding lines targeting consistent color and additive distribution in final plastic parts and films. During masterbatch production, temperature control and screw speed influence both quality and throughput, aligned with strict material certification requirements from downstream converters.

Industry compliance standards

• ISO 9001: Quality management for compounding operations
• EN 71-3: Safety of toys – Migration of certain elements (for toys and consumer goods)
• REACH Regulation: Substance-of-very-high-concern (SVHC) compliance in masterbatch composition
• FDA 21 CFR for specific colorants and additives (if masterbatch is for food contact)

Typical usage ratio

• 30–70% EVA carrier, up to 70% pigment or additive content by weight in concentrate; ratio is formulated per flow properties and customer requirements for color intensity or additive functionality.

Downstream process integration

• Melt-blending in twin-screw extruders, followed by strand pelletizing and cooling; granules are supplied to film, profile, or injection molders for repeatable dosing into final articles.

Final product types

• Pigment masterbatches, flame retardant masterbatches, UV-stabilizer concentrates, anti-static or anti-blocking additive masterbatches.