Applications of Sumitomo Chemical Sumitate HA-20 EVA in Industrial Manufacturing

Sumitate HA-20 EVA is a high melt index ethylene-vinyl acetate copolymer produced to meet demanding industrial specifications across several downstream sectors. With tailored vinyl acetate content, controlled viscosity, and consistent purity, this material serves critical roles in advanced film production, hot melt adhesives, wire and cable, footwear foam, photovoltaic encapsulation, and pharmaceutical packaging. Below we present key application pathways, each with details on standards, precise formulation guidance, process entry points, and manufactured end products.

1. Photovoltaic Encapsulation Films

Leading PV module manufacturers rely on this grade for producing encapsulant films that demand precise melt flow and high transparency. Manufacturers blend this raw material with specific crosslinking agents, UV absorbers, and stabilizers to yield films that maintain performance under thermal stress and prolonged UV exposure. Cleanroom extrusion and lamination lines integrate the resin, ensuring batch-to-batch consistency of interlayer sheets for crystalline silicon and thin-film panels.

Industry compliance standards

• IEC 61215 (Crystalline silicon terrestrial PV modules performance)
• UL 1703 / IEC 61730 (Safety standards for PV modules)
• RoHS Directive (2011/65/EU) for restricted hazardous substances
• ISO 9001:2015 (Quality systems in film production)

Typical usage ratio

• 70–90% in base encapsulant blends, adjusted for specific crosslinking rate and UV additive package.
• Modification according to target gel content and final film thickness requirements.

Downstream process integration

• Batch mixing with initiators and additives in sealed hoppers.
• Sheet extrusion between chill rollers, followed by in-line crosslinking oven.
• Lamination onto glass substrates in vacuum presses.

Final product types

• Photovoltaic cell encapsulant films
• Solar panel module interlayers
• Transparent backsheet films for outdoor PV modules

2. Hot Melt Adhesive (HMA) Base Resin

Formulators of industrial hot melt adhesives select HA-20 for its fast melt and controlled flow properties, building cohesive strength in packaging, woodworking, automotive trim, and bookbinding adhesives. The vinyl acetate level supports tack, compatibility with tackifiers, and flexibility across a range of temperatures, allowing precise control over open and set times critical for automated high-speed assembly lines.

Industry compliance standards

• FDA 21 CFR 175.105 (Adhesives for indirect food contact in packaging)
• REACH Regulation (EC) No. 1907/2006 (Chemical safety in formulation)
• GMP (Good Manufacturing Practices) for adhesives in food packaging
• ASTM D1876-08 (Peel resistance test for adhesives)

Typical usage ratio

• 30–75% in total adhesive formulation, depending on tackifier, wax, and stabilizer system.
• Ratio tuning based on bond strength and operating temperature range of application.

Downstream process integration

• Melting in jacketed mixing vessels with continuous agitation.
• Blending with resins, waxes, and antioxidants under inert nitrogen atmosphere.
• Extrusion to pellet, block, or pillow adhesive forms for commercial use.

Final product types

• Hot melt adhesive sticks and granules
• Industrial packaging sealants
• Bookbinding adhesives for automated lines
• Automotive interior mounting adhesives

3. Wires & Cables Insulation and Sheathing

Electrical cable compounding facilities utilize this raw material for insulation and sheathing layers offering flexibility, dielectric strength, and resistance to weathering. The resin enters precise formulations with flame retardants, antioxidants, and process oils to meet national and international electrical safety standards. Advanced extrusion controls and downstream vulcanization enhance durability for telecommunications, power, and data cables.

Industry compliance standards

• IEC 60502 (Power cables with extruded insulation)
• UL 62 / UL 1581 (Flexible cords & cable standards)
• RoHS compliance for restricted substances in cable compounding
• ISO/TS 16949:2009 for automotive wire production

Typical usage ratio

• 50–85% of total compound matrix, varying according to flexibility and flame resistance targets.
• Lower dosages when high loading of fillers and flame retardants required.

Downstream process integration

• Dry blend with additives in intensive mixers.
• Continuous melt compounding using twin-screw extrusion.
• Extruded insulation/sheath application in crosshead dies around conductor under precise temperature control.

Final product types

• Low-voltage power cables (building wiring, equipment cords)
• Telecommunication wire jackets
• Automotive primary wire insulation
• Coaxial/Fiber optic cable sheaths

4. Footwear and Midsole Foam Production

Footwear manufacturers incorporate this grade in physically or chemically blown foam formulations to produce athletic shoe midsoles, insoles, and industrial safety footwear. The melt index and vinyl acetate percentage allow control of foam cell structure and resilience, supporting both lightweight cushioning and high return properties required for performance and sportswear markets. Injection molding and sheet foaming lines standardize quality for high-volume output.

Industry compliance standards

• EN ISO 20344:2011 (Safety footwear test methods)
• China GB/T 15107 (Sports shoes safety requirements)
• REACH Regulation for chemical content compliance
• SATRA TM77 (Chemical resistance in footwear materials)

Typical usage ratio

• 45–90% by mass in midsole foam blend, with ratio adjusted for physical blowing agent and crosslinking system employed.
• Variation based on target Shore hardness and rebound elasticity.

Downstream process integration

• Compound mixing with blowing agents, crosslinkers, and accelerators in heated mixers.
• Injection molding into midsole, outsole, or insole molds with cycle monitoring.
• Continuous sheet extrusion foaming for slabstock products.

Final product types

• Athletic shoe midsoles and insoles
• Work and safety footwear components
• Flexible foam sandals and slipper soles
• Orthopedic and comfort footbeds

5. Pharmaceutical and Medical Packaging Films

Medical-grade packaging producers use this raw material for flexible films in blister, strip, and sachet packaging applications. Its combination of purity and flexibility ensures security for sensitive pharmaceutical forms while maintaining barrier and sterilization compatibility. Batch traceability and cleanroom integration remain central for compliance in pharmaceutical packaging value chains serving regulated markets.

Industry compliance standards

• USP <661.1> (Plastic packaging systems for pharmaceutical use)
• EU Regulation (EC) No. 1935/2004 (Materials in contact with food and drugs)
• ISO 15378:2017 (GMP for pharmaceutical packaging suppliers)
• FDA 21 CFR 177.1350 (Ethylene-vinyl acetate copolymers for food and drug packaging)

Typical usage ratio

• 60–98% in monolayer or coextruded film blends, based on mechanical property and transparency requirements.
• Adjustment for blended barrier layers or anti-block agents.

Downstream process integration

• Resin feedstock loading in GMP-compliant extruders.
• Coextrusion with other polymers (e.g., PVDC, PE) for multilayer barrier construction.
• Slitting and winding under cleanroom conditions for shipment to packaging lines.

Final product types

• Pharmaceutical blister packs
• Pouch and sachet medical packaging films
• Chemistry reagent sample bags
• Sterile barrier system films for medical devices