Applications of Formosa Plastics TAISOX 7320M EVA in Industrial Manufacturing

Formosa Plastics TAISOX 7320M EVA serves as a high-performance ethylene-vinyl acetate copolymer with carefully controlled properties, offering reliable results in specialty industrial manufacturing sectors. The following sections illustrate actual downstream uses, reflecting our clients’ real project requirements, formulation standards, and continuous production integration.

1. Photovoltaic Encapsulant Films

Our material is widely specified in encapsulant layer production for solar photovoltaic modules, where reliable gel content, UV resistance, and optical clarity must meet evolving market requirements. Materials engineers select 7320M grade to balance processability with mechanical stability during lamination. This product facilitates crosslinking under controlled thermal cycles, contributing to encapsulant sheets that shield sensitive solar cells from environmental degradation across diverse climates.

Industry compliance standards

• IEC 61215: Terrestrial photovoltaic (PV) modules – Design qualification and type approval
• UL 1703: Flat-Plate Photovoltaic (PV) Modules and Panels
• RoHS Directive (2011/65/EU) for low content of hazardous substances
• REACH (EC 1907/2006) registration for chemical substances

Typical usage ratio

• 65%–80% base polymer by weight; ratio adjusted based on co-extruded additives and need for UV stabilizer Masterbatches in the total formulation

Downstream process integration

• Primary material compounded in twin-screw extruders; sheet extrusion and subsequent lamination on solar cell arrays under vacuum/heat crosslinking at 140–155°C; crosslinker and silane coupling agents added in-line as formulation requires

Final product types

• Solar cell encapsulant sheets
• Backsheet bonding layers
• Flexible photovoltaic film modules
• Building-integrated PV laminates

2. Hot Melt Adhesive Formulation

7320M grade plays a crucial role as the main polymer base in industrial hot melt adhesive (HMA) systems. Operations in packaging, bookbinding, and woodworking require polymer matrices that deliver precise melting ranges, open times, and tailored flexibility. Our raw material enables stable batch-to-batch viscosity, low gel formation, and fast line speeds. End users achieve tailored bond strength and reduced yellowing even under cyclical processing loads.

Industry compliance standards

• FDA 21 CFR 175.105 for indirect food contact (packaging adhesives)
• EN 923: Adhesives – Terms and Definitions
• ISO 9001:2015 quality management in adhesive manufacturing
• Directive 94/62/EC for packaging and packaging waste

Typical usage ratio

• 40%–60% of hot melt formulation; adjusts for tackifiers (such as hydrocarbon resins), plasticizers, and waxes according to melt flow and tack specifications

Downstream process integration

• Pneumatic feeding into high-shear mixers; direct blending with resin and wax under 130–160°C; pelletization for bulk shipment or use in on-site adhesive application lines

Final product types

• Hot melt glue sticks
• Pressure-sensitive adhesive tapes
• Bookbinding adhesive spines
• Carton sealing adhesives

3. Cable and Wire Insulation Compounds

TAISOX 7320M resin supports compounded insulation and sheathing for electrical cables, achieving durable mechanical and dielectric properties that comply with stringent local and export market regulations. Engineers blend the copolymer with dedicated fire retardants and processing aids to manufacture flexible yet strong cable jackets, maintaining consistent melt flow index throughout the extrusion series for high yield and uniform thickness.

Industry compliance standards

• IEC 60502-1: Power cables with extruded insulation and their accessories
• RoHS 2011/65/EU (Restriction of Hazardous Substances Directive)
• UL 62 and UL 758 (Flexible cords and wiring materials)
• GB/T 2951.31-2008 (Chinese National Standard for insulation and sheath materials)

Typical usage ratio

• 55%–75% by compound weight; loading level set by required softness/hardness, expansion requirements, and targeted flame-retardant dose

Downstream process integration

• Resin dry blending with flame retardants and plasticizers; dosing into single- or twin-screw extruder; direct application over copper/aluminum conductors and continuous curing in steam or hot air

Final product types

• Low-voltage power cables
• Communication and data wires
• Coaxial cable insulation
• Flexible extension cords

4. Footwear Injection Molding Compounds

Manufacturers of sports, fashion, and safety footwear use our EVA as a principle raw material for midsoles, outsoles, and specialty foamed inserts. Specifications demand fine particle dispersity and predictable melt flow during injection and compression molding. This allows controlled cell nucleation—yielding lightweight, shock-absorbing structures. The copolymer grants repeatable rebound and hardness tuning to align with the final shoe design, ensuring high comfort and durability.

Industry compliance standards

• ISO 20871:2018 – Footwear – Outsoles – Test methods
• GB/T 15107-2013 (Chinese National Standard for Sports Footwear)
• REACH registration (for imported finished goods in EU markets)
• PAS 2050 for life cycle analysis (LCA) of footwear

Typical usage ratio

• 50%–85% polymer in blend (with PE, crosslinking agents, chemical blowing agents, pigments and stabilizing modifiers); dosing tailored by target expansion and feel

Downstream process integration

• Dry blend and direct feeding into foam injection molding machines; in-mold crosslinking through temperature and time control; post-mold sizing and finishing as required for outsole/midsole style

Final product types

• Athletic shoe midsoles
• Fashion footwear soles
• Anti-static work boots
• Slipper and sandal base layers

5. Flexible Packaging and Film Extrusion

Process lines for high-clarity, flexible packaging films depend on this EVA grade for co-extrusion with LDPE and other polymers. Packagers require precise sealing temperatures, impact resistance at low gauge, and functional surface finish for lamination or printing. The material’s balance of flexibility and strength supports applications in primary and secondary food packaging, maintaining form and barrier properties during fill, shipping, and shelf life.

Industry compliance standards

• US FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers: food contact approval)
• EU 10/2011 (Plastic materials and articles intended to come into contact with food)
• ISO 22000 (Food Safety Management Systems in packaging)
• GMP Regulation (EC) No 2023/2006 for food packaging production

Typical usage ratio

• 15%–40% base polymer layer (with LDPE, LLDPE, tie-layer resins); ratio selected for target seal strength, clarity, and printing response

Downstream process integration

• Inline gravimetric blending; melt extrusion through blown or cast film dies; secondary orientation, corona treatment, and slitting to customer gauge

Final product types

• Laminate food pouch films
• Frozen food packaging sheets
• Lidding membranes
• Resealable zipper tapes