Applications of Formosa Plastics TAISOX 7350F EVA in Industrial Manufacturing

Formosa Plastics TAISOX 7350F EVA is an established ethylene-vinyl acetate copolymer grade widely adopted across highly regulated industrial sectors. Its unique balance of melt flow, vinyl acetate content, and transparency supports specific production requirements in specialized manufacturing lines. Below, we present key application scenarios with industry-specific processing guidelines, quality regulations, and typical finished goods.

1. Photovoltaic Encapsulant Film Production

Major solar module manufacturers utilize TAISOX 7350F EVA as a key encapsulation layer due to its proven electrical insulation, strong adhesion to glass and silicon wafers, and optical clarity. The grade’s formulation ensures controlled melting and uniformity during the continuous extrusion calendaring process, vital for defect-free large-scale encapsulant film output.

Industry compliance standards

• IEC 61215 (Crystalline silicon terrestrial PV modules – design qualification and type approval)
• UL 1703 (Flat-plate photovoltaic modules and panels)
• TÜV Rheinland 2 PfG 1169/08.2007 (EVA sheet qualification for PV encapsulants)
• RoHS Directive (2011/65/EU) on hazardous substances

Typical usage ratio

• 65% – 100% as the matrix resin; usage tuned according to co-extrusion with UV stabilizers, crosslinking agents, or blending with anti-blocking additives (ratio adjustment aligns with required mechanical strength and lamination performance)

Downstream process integration

• Directly fed into twin-screw extruders for sheet formation, then calendared and cut; followed by crosslinking (peroxide cure or irradiation) to stabilize film properties before lamination onto solar cells

Final product types

• Photovoltaic encapsulant sheets for crystalline silicon modules
• Back-contact module encapsulant films
• Thin-film and heterojunction module interlayers

2. Hot Melt Adhesive Formulation

TAISOX 7350F EVA is a primary copolymer binder in the production of industrial and packaging hot melt adhesives, favored for its low-temperature processability, balanced flexibility, and strong cohesive strength. Producers leverage its consistent vinyl acetate content for predictable wetting performance on variable paper, film, and board substrates.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for food packaging indirect contact)
• REACH (EC 1907/2006) – substance registration for safety in the EU
• ASTM D3236 (Standard Test Method for Apparent Viscosity of Hot Melt Adhesives)
• ISO 19069-2 (Polyolefins—Melt mass-flow rate testing for quality control)

Typical usage ratio

• 15% – 55% as the main polymer phase; precise levels tailored according to additive plasticizer content, tackifier selection, and target viscosity (quantity adjusted for specific adhesion and open time requirements)

Downstream process integration

• Melt compounded with hydrocarbon resins, waxes, and anti-oxidants in high-shear batch reactors or continuous mixers; hot melt is then pelletized or directly pumped to coating lines

Final product types

• Hot melt adhesives for packaging closure and carton sealing
• Bookbinding glues
• Nonwoven hygiene assembly adhesives
• Pressure-sensitive adhesive formulations

3. Cable & Wire Insulation Compound Production

TAISOX 7350F EVA is widely selected by cable compounding plants for insulating and jacketing low-voltage wire and data cable, where flexibility, dielectric strength, and low-temperature crack resistance are required. Blending ratios align with fire safety and processing needs for power and telecommunication installations.

Industry compliance standards

• IEC 60228 (Conductors of insulated cables)
• UL 62, UL 1581 (Flexible cords and insulation test protocols)
• RoHS Directive (lead-free, phthalate-free integration)
• EN 50363 (Insulating, sheathing and covering materials for low-voltage energy cables)

Typical usage ratio

• 50% – 90% as the polymer base; dilution with flame retardants (ATH, magnesium hydroxide), plasticizers, and process aids based on cable mechanical and safety specifications (content modified to obtain target tensile and elongation values)

Downstream process integration

• Dry blended and compounded by single- or twin-screw extruders; pelletized compound is then extruded over conductors, followed by crosslinking (if required) and cooling in water baths before reel winding

Final product types

• Low-voltage electrical cable insulation
• LAN and data communication jacketings
• Flexible appliance cords
• Control and instrumentation wire coverings

4. Footwear Soling and Midsole Component Manufacturing

Leading shoe manufacturers incorporate TAISOX 7350F EVA in the direct injection molding and foam extrusion of lightweight outsoles and midsoles, valued for its cushioned feel, dimensional stability, and resistance to yellowing. The grade supports both closed-cell physical blown foam and chemical crosslinking for diverse sports and lifestyle products.

Industry compliance standards

• ISO 20871 (Footwear—Test methods for outsoles)
• ISO 20344/20347 (Safety, protective, and occupational footwear requirements)
• GB/T 3903.3-2011 (Physical testing—flex and abrasion of footwear solings)
• REACH Annex XVII (Restricted substances for consumer footwear)

Typical usage ratio

• 40% – 80% of polymer content, depending on the density and hardness target; often blended with PE or rubber modifiers—proportion adjusted for injection molding versus foam sheet extrusion

Downstream process integration

• Granulated raw material mixed with foaming agents, crosslinking additives, and pigments, then foam-expanded by injection molding or continuous sheet extrusion and cut to desired shape

Final product types

• Sports shoe midsoles
• Flip-flop soles
• Work footwear outsoles
• Comfort insoles and padding blocks

5. Flexible Film for Agricultural Greenhouse Coverings

Specialized processors use TAISOX 7350F EVA as a matrix resin in co-extruded greenhouse film, where high light transmission, cold flexibility, and UV stabilization are crucial. EVA’s optical and mechanical contribution improves plant growth and boosts the lifespan of plastic covers exposed to harsh outdoor conditions.

Industry compliance standards

• EN 13206 (Plastic films for agricultural covering—specifications and test methods)
• ISO 4892-2 (Plastics – Methods of exposure to laboratory light sources)
• OECD Principles of Good Laboratory Practice (for field-tested films)
• REACH compliance (absence of hazardous additives for agro use)

Typical usage ratio

• 10% – 40% in combination with LDPE or LLDPE; concentration set according to required transparency, elasticity, and film thickness (weather resistance and clarity balanced by adjusting EVA content)

Downstream process integration

• Chipped resin co-extruded via blown film lines at controlled line speeds, then surface treated (corona, anti-drip) prior to conversion into rolls for distribution to greenhouse installers

Final product types

• Multi-season greenhouse film covers
• Thermal insulation films for nurseries
• Tunnel covers for seasonal crop houses

6. Foam Sheet for Sports and Leisure Equipment

TAISOX 7350F EVA enables the foam processing sector to produce shock-absorbing, lightweight, and durable foam blocks and sheets. Its composition is optimized for high-resilience and low-odor performance, supporting sporting goods manufacturers who require consistent physical properties and color fastness in final products.

Industry compliance standards

• EN 71-3 (Safety of toys—migration of certain elements, for mats and sporting accessories)
• ISO 845 (Cellular plastics—apparent density testing)
• REACH Annex XVII (Consumer product chemicals regulations)
• ASTM D3575 (Testing for expanded flexible cellular materials—foam physical properties)

Typical usage ratio

• 60% – 100% as the core polymer phase, adjusted when combined with PE or crosslinkers for various demands on density and recovery speed (blowing agent and batch size define final ratio)

Downstream process integration

• Formulated with AC blowing agents, pigments, and stabilizers, then batch mixed and pressed in closed mold ovens, followed by post-expansion and die-cutting into shape as per product design

Final product types

• Yoga and exercise mats
• Athletic floor tiles
• Protective helmet lining inserts
• Camping and trekking pads