Applications of DuPont Elvax 670 EVA in Industrial Manufacturing

As a primary production manufacturer of DuPont Elvax 670 EVA, we support enterprises along the entire industrial value chain by supplying a consistent-grade copolymer suited for demanding downstream applications. Below are the main industry sectors and specific manufacturing scenarios where this material demonstrates measurable performance and meets established regulatory standards.

1. Hot Melt Adhesive Formulation for Packaging and Bookbinding

Manufacturers in the packaging and print finishing sectors rely on Elvax 670 EVA to enhance hot melt adhesive flexibility, rapid set speed, and durability under repeated stress. The resin’s moderate vinyl acetate content supports adhesive performance on challenging substrates such as coated paper, board, and some plastics. Formulators can modify tack, viscosity, and thermal stability according to real-world machinery needs—adjusting for environmental conditions and product thickness during operations.

Industry compliance standards

• FDA CFR 21 §175.105 (Adhesives, indirect food contact, US)
• EU Regulation (EC) No 1935/2004 (Materials in contact with food)
• REACH registration (EU chemicals management)
• BfR XIV and XXXVI (Germany food packaging paper/board coatings and adhesives)

Typical usage ratio

• 28%–45% by weight in total adhesive formulation; adjust for open time, viscosity, and target bond strength depending on application line speed and substrate permeability

Downstream process integration

• Batch addition to thermal mixers with compatible tackifiers and waxes, melted at 120–180°C prior to extrusion or application via roll coaters or slot die heads onto packaging or book spines

Final product types

• Folding carton adhesives, case and carton sealing adhesives, magazine & book spines, envelope side-seals, and laminating adhesives for flexible food packaging

2. Solar Photovoltaic Encapsulant Sheet Production

Photovoltaic module manufacturers select Elvax 670 EVA for its balanced melt flow and clarity when producing encapsulant sheets that protect and insulate cell assemblies. The copolymer chemistry supports crosslinking during lamination, preventing delamination under years of high UV and variable thermal loading outdoors. Sheet processors closely control additive incorporation and crosslinking profile to optimize electrical insulation and weatherability of modules under global energy standards.

Industry compliance standards

• IEC 61215 (Crystalline silicon terrestrial PV modules – Design qualification and type approval)
• UL 1703 (US Safety standard for flat-plate photovoltaic modules and panels)
• RoHS (Restriction of Hazardous Substances Directive, EU)
• JIS C 8918 (Japan photovoltaic module standards)

Typical usage ratio

• 60%–96% by weight in encapsulant compound; adjust for crosslinking agents and UV absorbers depending on required electrical and optical transmission profiles

Downstream process integration

• Compound pellet blending and sheet extrusion at 100–140°C, followed by calendaring and in-line film lamination with solar cell wafers and glass under vacuum and temperature (140–155°C, 10–20 min)

Final product types

• Photovoltaic module encapsulant films, back-sheets for solar panels, weather-resistant insulating laminates

3. Wire and Cable Insulation Compounds

Wire and cable extrusion plants incorporate this EVA grade into insulation and sheathing compounds to achieve a workable balance of mechanical strength, low-temperature flexibility, and dielectric properties. The resin’s melt characteristics support uniform compound dispersion of flame retardants and processing aids, allowing tight adherence to electrical and fire safety regulations across the power, data, and appliance cabling industries. Consistency of polymer grade supports automated high-throughput extrusion lines with minimal production downtime.

Industry compliance standards

• UL 62/758 (Flexible cords, appliance wiring material, North America)
• CSA C22.2 No.49 (Canada electrical cable compounding regulations)
• IEC 60227, IEC 60332 (International standards for PVC-insulated cables, fire testing)
• RoHS 2 Directive (EU chemical compliance for electricals)

Typical usage ratio

• 20%–45% by weight in insulation and sheathing compound blends; adjust for filler and flame retardant loading based on voltage requirements and certification class

Downstream process integration

• Addition to high-shear kneader extruders with synergists, silane crosslinkers, and fillers, followed by pelletizing and final extrusion over copper or aluminum wire at 110–150°C

Final product types

• Building wire insulation, flexible power cords, data cables, automotive low-voltage harness sheaths, appliance inner insulation jackets

4. Footwear and Injection Molded EVA Foam Manufacturing

Footwear and sporting goods manufacturers favor Elvax 670 EVA in injection- and compression-molded foam applications that demand controlled density, resilience, and fine cell structure. The MAP (melt-additive processing) properties ensure reliable foam expansion and bonding, giving producers a tunable platform for producing midsoles, insoles, and sport safety materials. Downstream compounding teams pair this base resin with precise quantities of foaming agents and crosslinkers, monitoring cell morphology and shape recovery on automated lines.

Industry compliance standards

• ISO 20344/20347 (Personal protective footwear standards)
• GB/T 15107 (China standards for molded rubber/plastic footwear materials)
• REACH Annex XVII (EU regulation on restricted substances in consumer products)
• Prop 65 (California Safe Drinking Water and Toxic Enforcement Act, material disclosure)

Typical usage ratio

• 70%–92% by weight in foamable compound, balance composed of blowing agent, crosslinker, colorant, and performance modifiers; ratio adjusted for target foam density and flexibility

Downstream process integration

• Blending into foam compound via high-speed mixers, pre-form extrusion or pelletizing, then injection or compression molding at 140–200°C, with controlled pressure/temperature cycling for desired cell size and hardness

Final product types

• Athletic shoe midsoles, anti-fatigue floor mats, sport helmet padding, children’s shoe outsoles, custom orthotic insoles

5. Flexible Film Production for Agricultural and Industrial Packaging

Film extrusion plants produce multi-layer blown or cast films using this EVA to increase tear resistance, low-temperature flexibility, and sealing performance—particularly in greenhouse covers, silage wraps, and specialty packaging. Material properties maintain transparency and high elongation even under frequent flexing and incident UV, which is essential for protecting agricultural produce and industrial goods during transport and storage. Formulators often balance percentage with LDPE or other co-monomers according to seasonal and geographic requirements for film durability.

Industry compliance standards

• EU Food Contact Plastics Regulation (EU) No 10/2011
• USDA standards for agricultural films
• ISO 16620-1 (Sustainability in plastics—biodegradable and biobased content reporting)
• ASTM D882 (Tensile properties of thin plastic sheeting)

Typical usage ratio

• 8%–30% by weight in co-extruded multilayer films; precise adjustment based on required mechanical properties, thickness, and atmospheric resistance

Downstream process integration

• Direct blending into LDPE or LLDPE matrix at film extrusion hopper, processed on single-screw or co-extrusion blown film lines at 120–150°C with in-line gauge and width monitoring

Final product types

• Greenhouse roofing films, silage stretch wrap, bag-in-box liners for liquids, shrink hood films, protective pallet wraps

6. Masterbatch and Color Concentrate Carrier Resin

Masterbatch producers use Elvax 670 EVA as a carrier resin for pigments and functional additives, which imparts good dispersion capability and compatibility with a broad array of thermoplastic hosts. The resin processability at moderate temperatures prevents pigment degradation, enabling the coloring of sensitive packaging, wire coatings, or technical injection-molded items. Its rheology aids masterbatch dosing accuracy on automated compounding and molding lines at customer facilities.

Industry compliance standards

• FDA 21 CFR 177.1350 (Ethylene–vinyl acetate copolymers for food contact applications)
• EN 71-3 (Toy safety: Migration of certain elements, Europe)
• ISO 9001:2015 quality management for polymer compounding
• UL Yellow Card (US polymer flammability and regulatory database)

Typical usage ratio

• 35%–65% by weight as pigment or additive carrier matrix; actual loading based on target masterbatch color intensity and dispersant compatibility with host polymer system

Downstream process integration

• High-shear twin-screw mixing with pigment or performance additive, pelletizing via strand or underwater die-face cutter for use in further extrusion, injection, or blow molding

Final product types

• Color masterbatches for cable sheathing, packaging, toys, and technical molded parts; additive masterbatches for anti-block, UV resistance, or antistatics in thermoplastics