Applications of Xinjiang Tianli TL-2825 EVA in Industrial Manufacturing

Xinjiang Tianli TL-2825 EVA is an ethylene-vinyl acetate copolymer widely used in downstream industrial sectors requiring precise formulation, stable processability, and stringent compliance with international standards. Below, we detail its recognized applications in major manufacturing fields, based on direct production experience and customer application cases.

1. Photovoltaic Encapsulation Films

The photovoltaic industry uses this EVA grade for producing high-transparency encapsulation films mandatory in crystalline silicon solar module assembly. The material provides the requisite melt flow and crosslinking properties, allowing reliable lamination while maintaining optical clarity and weatherability to withstand outdoor conditions for more than 25 years. Its consistent vinyl acetate content supports both fast and stable crosslinking kinetics, reducing lamination cycle times while meeting strict performance testing of module manufacturers.

Industry compliance standards

• IEC 61215 Photovoltaic Module Qualification
• IEC 61730 Module Safety Qualification
• ISO 9001:2015 certified QC for solar materials
• RoHS Directive (EU) 2011/65/EU for restricted substances

Typical usage ratio

• 100% as main encapsulant layer formulation
• Can be blended at 70–90% with crosslinking agents and stabilizers as required by module design

Downstream process integration

• Fed into twin-screw extrusion for pelletizing
• Extruded or calendared into sheets of 0.4–0.6 mm thickness
• Laminated onto silicon cells with glass via vacuum lamination process, curing at 150–160°C for 12–18 minutes

Final product types

• Crystalline silicon solar modules (mono/poly)
• Bifacial solar modules
• Thin-film solar panels
• Building-integrated photovoltaic (BIPV) units

2. Hot Melt Adhesive Formulations

Many industrial adhesive manufacturers select this grade for blending hot melt adhesives used in packaging, woodworking, bookbinding, and automotive interiors. The vinyl acetate content and molecular weight ensure compatibility with tackifying resins and waxes, delivering controlled open time, adhesion strength, and low odor performance. Manufacturers adjust the EVA base to fine-tune viscosity and melting point per sector-specific machinery and substrate requirements.

Industry compliance standards

• FDA 21 CFR 175.105 for indirect food contact adhesives (US)
• EN 923:2015 Standard for Adhesives – Terms and Definitions
• GB 18583-2008 Indoor Decorating Adhesive Limits (China)
• REACH Regulation (EC) No 1907/2006 chemical safety

Typical usage ratio

• 40–70% in blend, adjusted for softening point and bond strength
• Ratio varies by addition of tackifiers, plasticizers, and waxes for required rheology and set time

Downstream process integration

• Gravimetric dosing with tackifying resins in Z-blade mixers or internal batch reactors
• Cooled, pelletized, and extruded or directly supplied as granules
• End users re-melt EVA blend in glue tanks or applicators at 120–180°C

Final product types

• Case and carton sealing adhesives
• Book spine adhesives
• Furniture edge-banding and assembly adhesives
• Automotive trim and carpet adhesives

3. Foam Manufacturing for Footwear and Sports Equipment

This EVA material enables production of crosslinked and non-crosslinked foams for midsoles, insoles, sports mats, and protective padding. Controlled VA content and melt index give reliable cell structure and resilience in batch or continuous foaming lines. Processors can compound with blowing agents, crosslinkers, and fi llers to optimize hardness, rebound, and density, matching product specifications of global footwear brands and sports goods suppliers.

Industry compliance standards

• ISO 20345:2022 Personal Protective Equipment – Safety Footwear
• ISO 1268:2021 Plastics – Cellular Materials – Test Methods
• CPSIA (Consumer Product Safety Improvement Act) for children’s goods (US)
• EN 71-3 Safety of Toys: Migration of certain elements (EU)

Typical usage ratio

• 60–95% in foam compound, depending on desired hardness and density
• Lower ratios (with polyolefin blends) for softer, lightweight foams in high-cushioning sports products

Downstream process integration

• Dry blend with blowing agents (azodicarbonamide, OBSH, etc.), crosslinkers (DCP), pigments, and fi llers
• Knead in Banbury mixer then sheeted through open mills
• Heat foam in batch or continuous ovens at 160–200°C to expand and crosslink
• Die-cut or mold to customer-specific dimension and pattern

Final product types

• Injection-molded and compression-molded shoe midsoles
• Yoga, gymnastics, and sports mats
• Protective padding and helmet liners
• Water-resistant beach sandals and slippers

4. Wire and Cable Insulation Compounds

Wire and cable compound processors use this EVA for sheathing and insulation in low-voltage electrical cables, telecom wires, and automotive harnesses. The copolymer’s balance of flexibility, dielectric property, and tensile strength ensures reliable extrusion without plate-out or scorch at typical line speeds. End users formulate with necessary flame retardants, stabilizers, and colorants to achieve insulation and jacket compounds that pass regulatory flame and aging tests.

Industry compliance standards

• UL 62 and UL 758 for flexible cords and appliance wiring (US)
• IEC 60227, IEC 60332-1 for flame tests
• RoHS Directive for hazardous substance limits
• GB/T 2951.21-2008 Electric Cables – Insulation and Sheath Testing (China)

Typical usage ratio

• 45–85% in compound depending on cable class and required mechanical strength
• Higher filler loading (e.g., ATH for flame retardancy) may reduce EVA ratio in some compounds

Downstream process integration

• Pneumatic transfer into high-intensity mixers with additives and flame retardants
• Compound pelletized, dried, then melted in single-screw or twin-screw extruders
• Extrude onto copper or aluminum conductors, followed by online crosslinking if specified

Final product types

• Low-voltage electrical wire insulation
• Data communication cable jackets
• Automotive primary wire insulation
• Flexible power cords and appliance cables

5. Film Applications for Flexible Packaging

Many flexible packaging film producers rely on this EVA type for blown and cast film processes serving food and pharmaceutical markets. The resin’s polarity and clarity aid in sealability and low-temperature heat sealing of multilayer structures such as coextruded pouches, lidding films, and shrink wraps. The grade facilitates blending with LDPE or LLDPE to enhance toughness and optical properties without sacrificing form-fill-seal runnability.

Industry compliance standards

• FDA 21 CFR 177.1350 Olefin Polymers for food contact (US)
• EU Regulation (EC) No 1935/2004 on Materials for Food Contact
• GB 9685-2016 Additives in Food Contact Materials (China)
• BRCGS Packaging Material Global Standard

Typical usage ratio

• 10–40% in film formulations depending on film thickness, sealing temperature, and flexibility
• Adjust level to optimize blocking, clarity, and tear resistance for specific end use

Downstream process integration

• Pellet blending with LDPE/LLDPE in gravimetric feeders
• Melt compounded and blown on film lines at 170–200°C with air cooling tower
• Laminated with barrier layers or surface-printed as required by packaging design

Final product types

• Frozen food and vacuum pouches
• Pharmaceutical strip packaging films
• Shrink and stretch wraps for beverage
• Breathable medical packaging and lidding

6. Injection and Injection-Blow Molding for Toys and Housewares

Downstream molders utilize this EVA grade in injection and injection-blow molding to manufacture flexible toy parts, soft handles, household utensils, and squeezable containers. The polymer’s melt flow rate suits a broad range of cavity fills, assuring part definition and demold without stress whitening or odor. Compounders can modify with pigments and plasticizers to achieve a range of shore hardness values and comply with strict migration and physical safety criteria for children’s articles.

Industry compliance standards

• EN 71-3 Safety of Toys: Migration of certain elements
• GB 6675.4-2014 National Toy Safety Technical Code (China)
• CPSIA sec. 101/108 for children’s products (US)
• ISO 8124-3 Safety of Toys – Part 3: Migration of certain elements

Typical usage ratio

• 70–100% resin content for single-material parts
• Can be blended with impact modifiers or fillers for enhanced performance

Downstream process integration

• Resin granules fed into injection molding machines
• Melted at 160–220°C, injected into precision molds under specified pressure
• Secondary finishing includes demolding, trimming, and polishing

Final product types

• Flexible toy figurines and components
• Soft bottle caps and container closures
• Ergonomic household grips and handles
• Baby care accessories