| HS Code | 643801 |
| Product Name | Greenflex HN 70 EVA Copolymer Resin, Hot Melt Adhesive Compounding Grade |
| Material Type | Ethylene-Vinyl Acetate (EVA) Copolymer |
| Vinyl Acetate Content | 28 wt% |
| Melt Flow Index | 70 g/10 min (190°C, 2.16 kg) |
| Density | 0.95 g/cm³ |
| Melting Point | 75°C |
| Vicat Softening Temperature | 50°C |
| Shore A Hardness | 82 |
| Tensile Strength At Break | 13 MPa |
| Elongation At Break | 800% |
| Brittleness Temperature | -70°C |
| Flexural Modulus | 35 MPa |
As an accredited Greenflex HN 70 EVA Copolymer Resin,Hot Melt Adhesive Compounding Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packed as free-flowing pellets in 25 kg multi-ply paper bags, palletized and shrink-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | Greenflex HN 70 EVA resin in 25kg bags, palletized and shrink-wrapped, loaded securely into a 20′ FCL for safe transport. |
| Shipping | Greenflex HN 70 EVA Copolymer Resin is shipped as solid pellets in moisture-proof polypropylene bags, palletized and stretch-wrapped. Bulk quantities via tanker or pneumatic trucks. Protect from sunlight and high heat during transit to avoid clumping. Standard dry-goods transport; no hazardous classification. Handle with care to maintain integrity. |
| Storage | Store Greenflex HN 70 EVA resin in a cool, dry, well-ventilated area, away from direct sunlight, heat, and open flames. Keep containers sealed to prevent moisture absorption and contamination. Maintain temperatures below 30°C. Avoid stacking excessively. Use within recommended shelf life for optimal adhesive compounding performance. |
| Shelf Life | Shelf life is typically 2 years from manufacture when stored unopened in a cool, dry place away from heat and sunlight. |
In corrugated case and carton closing, Greenflex HN 70 is compounded as the primary EVA backbone for hot-melt formulations in which sealing speed, low-temperature fibre tear on kraft liner, and clean machining at the compression section are the release criteria rather than adhesive hardness alone. The resin’s high vinyl acetate content suppresses polyethylene crystallinity and shifts the solidification profile toward a broad, low-energy recrystallisation window, which permits compression cycles between 0.3 s and 1.2 s on high-speed case erectors before the board springs back. In food-contact secondary packaging, adhesive materials must comply with FDA 21 CFR 175.105 for adhesives used in packaging with no functional barrier and with EU Regulation 10/2011 when the container falls under plastics food-contact legislation; migration testing is conducted under EN 1186-1 and overall migration must not exceed 10 mg/dm². A formulation that balances open time and set speed typically contains 30–40 wt% Greenflex HN 70, 35–45 wt% hydrogenated C5/C9 hydrocarbon tackifier, 20–30 wt% Fischer-Tropsch wax, 0.5–1.0 wt% hindered phenolic antioxidant, and 0.2–0.5 wt% acid scavenger or optical brightener when so specified.
Compounding is carried out in a jacketed sigma-blade mixer or a co-rotating twin-screw extruder having an L/D ratio of 40:1 to 48:1; barrel temperatures are staged from 120 °C to 155 °C, and the melt is filtered through a 200 μm screen pack to remove char particles and insufficiently dispersed tackifier domains. On the packaging line, the adhesive is melted at 150–170 °C and delivered through a slot nozzle or wheel applicator at viscosities commonly between 800 mPa·s and 2,000 mPa·s; coat weights range from 0.5 g/m to 2.5 g/m depending on flute type and board stiffness. Terminal finished types include regular slotted containers, die-cut mailers, wrap-around blanks, and corrugated trays. A processing conflict arises when wax content exceeds 30 wt% or when melt temperature drops below 150 °C: the high-VA phase can separate from the wax phase, yielding skip pattern application and inadequate compression set, whereas temperatures above 180 °C accelerate oxidative yellowing on bleached board.
For perfect binding of softcover books, the hot melt is pumped from a premelter at 150–170 °C through a slot nozzle onto a milled spine; the dominant failure modes are spine cracking at temperatures below 5 °C and page pull after repeated flexing. The use of Greenflex HN 70 at 18–28 wt% in a bookbinding hot-melt formulation increases low-tack energy absorption without the excessive openness that prevents high-speed cover nipping. The remaining components are typically 40–50 wt% rosin ester tackifier, 15–25 wt% paraffin or Fischer-Tropsch wax, 10–15 wt% calcium carbonate filler, and 0.5–1.0 wt% stabilizer. Regulatory compliance for book adhesives sold in the European Union requires REACH registration under EC 1907/2006; children’s book adhesives may be screened according to EN 71-3 migration limits for heavy metals, while low-VOC declarations are often benchmarked against VDA 270 or client-specific odour limits. Production is usually continuous or semi-continuous: after mixing at 130–160 °C, the adhesive is cast through a 0.3–0.6 mm slot at 160–175 °C, the cover is nipped at 0.2–0.6 MPa, and the block is cooled to below 30 °C before three-knife trimming. Finished part types generated by this process are perfect-bound paperback books, high-page-count catalogues, layered repair manuals, and educational softcover directories.
Disposable hygiene elastic attachment imposes a narrow processing window in which pump-to-application viscosity, elastic creep resistance at body temperature, and thin PE film thermal damage define the acceptable additives and coat weight. Greenflex HN 70 serves as a high-polarity EVA modifier in formulations where 20–30 wt% resin is combined with 40–55 wt% hydrogenated hydrocarbon tackifier, 10–20 wt% naphthenic or paraffinic process oil, 0–5 wt% microcrystalline wax, and 0.5–1.0 wt% hindered phenolic antioxidant. Industry compliance for hygiene adhesives is not governed by a single food-contact standard; instead, skin-contact safety is commonly assessed using ISO 10993-5 for in vitro cytotoxicity and ISO 10993-10 for skin sensitisation and irritation when the converter requires medical-grade documentation, while REACH EC 1907/2006 Annex XVII entries 51 and 52 restrict phthalate plasticisers in childcare articles. On a production line, a slot die coater is fed from a continuous melt system at 140–160 °C; elastic strand bond coat weights range from 3 g/m² to 8 g/m², whereas backsheet lamination and waistband construction require 10–25 g/m². Nip pressure is maintained between 0.2 bar and 1.0 bar, and line speeds commonly reach 200–600 m/min. The principal process conflict is that application above 165 °C can burn through 12–20 μm polyethylene backsheet film, while temperatures below 135 °C produce melt fracture, adhesive throw-off, and inconsistent strand bonding. Terminal finished types include infant diaper leg cuffs, waistbands, adult incontinence pads, and ultrathin sanitary napkin cores.
The conversion of high-VA EVA into edgebanding and profile-wrapping hot melts requires a pot-stable viscosity at 190–210 °C, rapid crystallisation after the press roll, and enough open time to align PVC, ABS, veneer, or polyester edge material before contact. A furniture-grade formulation generally contains 30–45 wt% Greenflex HN 70, 25–40 wt% hydrogenated hydrocarbon tackifier, 10–25 wt% calcium carbonate filler, 5–15 wt% macrocrystalline wax, and 0.5–1.0 wt% antioxidant. The reference compliance framework is EN 204 classification D3 for interior non-structural thermoplastic wood adhesives, plus French NF EN 12765 for woodworking adhesives where load-bearing classification is not required; emission and odour limits are often established by VDA 270 or by furniture emission classes. During application, the adhesive is melted in a heated hopper and transferred by a gear pump to a roller or slot nozzle on an edgebander; line speeds of 10–25 m/min require open times between 2 s and 8 s and compression pressures of 0.3–0.8 MPa. Filler loading above 25 wt% reduces stringing and adhesive consumption but raises melt viscosity and can produce edge brittleness below −10 °C; Greenflex HN 70, with its high VA content, offsets some of that brittleness at the interface. Terminal products include PVC and ABS edge-banded furniture panels, veneered MDF doors, kitchen cabinet fronts, and profile-wrapped drawer fascias.
At high-speed label converting, the adhesive layer is expected to wet coated paper and clear polypropylene face stocks within milliseconds, release cleanly from the liner, and resist shear creep at warehouse temperatures above 40 °C. Greenflex HN 70 is used at 15–25 wt% as a polar compatibilizer and cohesive strength donor in hot-melt pressure-sensitive label formulations; the balance is 45–60 wt% rosin ester or hydrogenated hydrocarbon tackifier, 15–25 wt% naphthenic/paraffinic oil, 0–5 wt% wax, and 0.5–1.0 wt% stabilizer. Food-labeling compliance rests on FDA 21 CFR 175.125 for pressure-sensitive adhesives used in food contact, with FDA 21 CFR 175.105 applicable to dry food labels and EU Framework Regulation 1935/2004 governing overall suitability; migration testing is performed according to the EN 1186 series when the label is inside the package or in direct contact with food. Production is conducted on a hot-melt slot-die coater at 150–180 °C with coat weights from 15 g/m² to 30 g/m² onto glassine or polycoated release liner; transfer to face stock proceeds at 150–300 m/min through a cold laminating nip. Above 60 wt% tackifier, cohesive strength falls and bleed-through on uncoated paper increases; below 15 wt% EVA, mandrel peel and high-speed die-cutting generate adhesive stringing and matrix stripping failures. Terminal outputs are wrap-around bottle labels, pressure-sensitive primary labels for beverage pouches, clear-on-clear labels for personal care bottles, and adhesive-coated transfer webs for high-speed dispense.
For automotive interior lamination, the hot-melt system bonds nonwoven acoustic scrims to polyurethane foam cores, fibrous absorbers, and polyolefin backing layers where fogging, odour, and flame-spread performance are controlled by the OEM specification. Greenflex HN 70 is incorporated at 15–30 wt% with 30–50 wt% aliphatic hydrocarbon tackifier, 10–20 wt% low-volatility amorphous polyalphaolefin or polyisobutylene, 0–5 wt% wax, and 0.5–1.0 wt% stabilizer to minimize polar wax exudation. Interior materials are tested in accordance with VDA 278:2011 for VOC and fugitive emissions, VDA 270:2018 for odour, and ISO 3795 for horizontal burning rate; passenger-compartment applications generally require a burning rate no greater than 100 mm/min. Application is performed by heated spray, slot die, or roller coater at 150–180 °C; bond line compression is set at 0.1–0.5 MPa, and line speeds are 10–40 m/min depending on foam density and scrim grammage. The processing boundary is defined by the foam substrate: prolonged nozzle temperatures above 190 °C induce visible foam collapse and odour, while inadequate preheating of the nonwoven scrim below 30 °C causes adhesive skin-over and poor fibre penetration. Terminal interior parts include headliners, door panel inserts, trunk side trim, seat back panels, and under-carpet acoustic pads.
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Greenflex HN 70 is an ethylene-vinyl acetate copolymer resin designated as a hot-melt adhesive compounding grade. The polymer is a random ethylene-vinyl acetate copolymer; the vinyl acetate content is typically reported in the 27–29 wt% range when tested according to ISO 8985:1998 or an equivalent supplier release method. Melt flow rate is measured under ISO 1133-1:2022 at 190 °C and 2.16 kg, with typical values of 5–7 g/10 min. Density measured by ISO 1183-1:2019 is approximately 0.950 g/cm³, and Shore A hardness is commonly cited in the range 72–80 under ISO 868:2003. The resin is supplied as translucent pellets and is not a finished adhesive; it is an intermediate compound for melt blending with tackifiers, waxes, antioxidants and, where required, plasticisers. The vinyl acetate content is higher than in film-grade or injection-moulding EVA resins with 17–19 wt% VA, which increases polarity and reduces crystallinity. The molecular weight distribution is controlled for hot-melt compounding: the 5–7 g/10 min melt flow rate is lower than high-speed packaging EVA grades above 25 g/10 min, providing a compromise between pumpable viscosity and cohesive strength. Pellet surface moisture should remain below 0.05 wt%, and storage above RH 60% may require drying before melt processing. Greenflex HN 70 is used in packaging, carton and case sealing, bookbinding, paper converting and assembly bonding where hot-melt application is used and where adhesion to polar or porous substrates is required. It differs from low-VA EVA grades by its higher tack and adhesion to cellulosic and polar surfaces, and differs from high-MFI hot-melt grades by its higher melt viscosity and improved high-temperature creep resistance.
Thermal degradation is the main process limit. Ethylene-vinyl acetate copolymers undergo deacetylation when melt temperature exceeds 180 °C, releasing acetic acid and producing conjugated double bonds that cause colour shift, viscosity drift, and reduced peel adhesion. For Greenflex HN 70, production compounding is therefore carried out with a target melt temperature of 150–170 °C. On a co-rotating twin-screw extruder with screw diameter 25–75 mm and 40:1 L/D, barrel setpoints typically progress from 90 °C at the feed zone to 150 °C at the die. Screw configurations with too many restrictive kneading blocks can produce local viscous heating above the deacetylation threshold even when barrel temperatures are conservative. The pellets soften above 45 °C; a water-cooled feed throat is necessary to prevent feed-blocking on continuous compounding lines. Drying at 60 °C for 4 h in desiccant or dry-air systems is used when surface moisture exceeds 0.05 wt%. If a finished hot-melt is held in an open melt tank at 160 °C for longer than 2 h, nitrogen blanketing or continuous recirculation limits oxidative skin formation. Acetic acid generated during occasional thermal excursions can attack mild steel and gear-pump seals; melt filtration through 100–200 µm mesh is a common protection method. The resin should not be compounded with acid-sensitive additives that promote deacetylation or with halogenated flame retardants that may form corrosive acidic by-products. Published data for degradation kinetics in Greenflex HN 70 under high-shear conditions is limited, so plant trials should monitor melt colour and viscosity drift during extended runs.
Tackifier and wax ratios control open time and set time more strongly than small changes in EVA molar mass. In typical packaging hot-melt formulations, Greenflex HN 70 is used at 25–35 wt% of the finished adhesive, with hydrocarbon tackifier resin at 30–50 wt% and Fischer-Tropsch or paraffin wax at 15–30 wt%. A hindered phenol antioxidant is added at 0.5–1.0 wt% to limit oxidative chain scission. When a C5/C9 tackifier with ring-and-ball softening point 95–105 °C under ASTM E28 is used at 40 wt%, the compound viscosity at 160 °C commonly falls into the range 1,000–5,000 mPa·s, suitable for slot-die and roller coaters. Viscosity is measured by rotational viscometry under ISO 2555:2018 for each batch because tackifier source and wax melting point shift the curve. Published data for this specific configuration is limited; formulators should validate each adhesive compound on the target production line. Wax addition above 30 wt% shortens set time but increases brittle-failure risk at low ambient temperatures. On high-speed case-sealing equipment, adhesive application below 140 °C can produce pattern skipping and intermittent bead width; this is corrected by increasing melt temperature or reducing wax content rather than by increasing pump speed alone.
Rheological response in HN 70-based hot melts is shear-thinning. At slot-die shear rates from 10,000 to 50,000 s⁻¹, apparent viscosity decreases and allows film transfer at line speeds from 50 to 300 m/min. At 180 °C, an unfilled adhesive compound may register below 5,000 mPa·s; at 140 °C the same system can exceed 15,000 mPa·s, raising gear-pump discharge pressure and producing bead defects. Heated hoses with inside diameter 10–15 mm and melt pumps rated for 200 bar are typical for production application. Open time is not defined by a single ISO or ASTM method; it is measured by a 300 µm drawdown on kraft paper or polyethylene-coated board. With a 30 wt% wax formulation, open time is commonly 5–15 s and set time 1–3 s on non-porous substrates; on corrugated board, both values shorten because the substrate absorbs low-viscosity fractions. T-peel adhesion on flexible substrates can be measured by ASTM D1876 or ISO 11339, and creep resistance under load by ASTM D4498. Higher-melting wax grades increase heat resistance but require higher application temperature; for Greenflex HN 70, the practical upper operating temperature is governed by deacetylation rather than wax melting point.
Production behaviour on hot-melt lines shows that melt tank uniformity often controls quality more than extruder profile precision. In heated reservoirs with poor heat transfer, a polymer-rich phase may remain near 150 °C while a wax-rich phase approaches 175 °C; phase separation can form char on tank walls and carbonaceous fines that block downstream filters. Recirculating gear pumps and static mixers reduce stratification. Feed lines and nozzles should be purged with nitrogen during shutdown because oxygen ingress at 160 °C promotes surface skinning. Intermittent delivery with nozzle stalling for more than 20 min at temperature can degrade resin in dead zones; low-dead-volume manifolds and nozzle shut-off valves should be specified. Batch-to-batch variability is controlled by supplier release tests on melt flow rate and vinyl acetate content, but compounding plants should also check pellet surface moisture after storage in humid warehouses. A moisture level above 0.05 wt% creates steam bubbles during melt blending, visible as pinholes in 100–200 µm adhesive films and as poor bond uniformity.
Substitution of an EVA with vinyl acetate content below 20 wt% into a formulation designed for Greenflex HN 70 changes crystallisation, wetting, and low-temperature flexibility. The lower-VA resin is stiffer, with Shore A hardness often above 85 under ISO 868, and it builds cohesive strength rapidly. Adhesion to cellulosic and polar surfaces is reduced because the acetate group concentration is lower, and the bond may show acceptable T-peel on clean aluminium but reduced fibre-tear coverage on corrugated board. High-MFI EVA with MFI > 25 g/10 min lowers melt viscosity and enables faster coating, but it can soften the final bond and reduce high-temperature creep resistance. Greenflex HN 70 occupies an intermediate position: it provides sufficient polar vinyl acetate content for wetting and sufficient molar mass for cohesive strength. Table 1 compares polymer-class values for engineering selection; direct material data should be obtained from the supplier for safety-critical or food-contact applications.
| Parameter | Greenflex HN 70 class | Low-VA EVA class | High-MFI EVA class |
|---|---|---|---|
| Vinyl acetate content | 27–29 wt% | 17–19 wt% | 27–29 wt% |
| Melt flow rate ISO 1133-1:2022 | 5–7 g/10 min | 3–5 g/10 min | 25–30 g/10 min |
| Density ISO 1183-1:2019 | 0.945–0.955 g/cm³ | 0.930–0.940 g/cm³ | 0.945–0.955 g/cm³ |
| Shore A hardness ISO 868:2003 | 72–80 | 85–92 | 65–75 |
| Melt viscosity of compound with 40 wt% tackifier at 160 °C | 1,000–5,000 mPa·s | 8,000–15,000 mPa·s | 300–800 mPa·s |
| Open time on coated paper, 300 µm film | 5–15 s | 3–8 s | 10–25 s |
| Adhesion to polar substrates | moderate to high | lower | moderate |
| Low-temperature flexibility | moderate | lower | moderate to high |
| High-temperature creep resistance | moderate | higher | lower |
Release testing for Greenflex HN 70 should include verification of melt flow rate, vinyl acetate content, density and Shore A hardness. An upward MFR drift above 7 g/10 min can indicate lower molecular weight distribution and reduce hot-tack strength; a downward drift below 5 g/10 min can increase melt viscosity beyond the operating range of low-pressure delivery systems. Vinyl acetate content below 27 wt% reduces polarity and may weaken adhesion to polar surfaces; above 29 wt% the resin becomes softer and more prone to pellet blocking and final-bond creep. Shore A hardness below 72 may indicate excessive plasticisation or high VA content; above 80 suggests reduced flexibility for low-temperature peel. For hot-melt formulators, Greenflex HN 70 is a base resin, not a moulding material. It should be screened for compatibility with specific tackifiers by melt-mixing trials and differential scanning calorimetry under ISO 11357-1, because phase separation or crystallinity shifts can occur with highly incompatible resin systems.
In bookbinding spine-glue operations, Greenflex HN 70 is compounded with rosin ester tackifiers because rosin esters provide adhesion to coated paper and reduce melt viscosity. A typical starting formula for spine gluing is 30 wt% Greenflex HN 70, 40 wt% pentaerythritol rosin ester with softening point 100–110 °C, 25 wt% Fischer-Tropsch wax, and 1 wt% hindered phenol antioxidant. The hot melt is applied at 160–170 °C through nozzle or roller systems. Page-pull performance measured by internal destructive testing or ISO 11339 depends on paper coating and adhesive film thickness; films below 200 µm on heavily coated paper may show limited fibre tear. Published data for this specific configuration is limited because bookbinding adhesives are formulation-dependent. In case and carton sealing, the resin is used in formulae where compression time is short and bond strength must develop within 0.5–2 s. High-melting microcrystalline wax improves heat resistance but raises application temperature. The operating window is controlled by wax type and loading rather than by changing the HN 70 resin unless a step change in system viscosity is required.
For food-packaging adhesives, Greenflex HN 70 alone does not confer regulatory clearance; the finished adhesive formulation must meet the selected jurisdiction. In the United States, hot-melt adhesives for indirect food contact may be evaluated under 21 CFR 175.105. In the European Union, plastics and adhesives in food contact are assessed under Regulation (EU) No 10/2011 as amended, with overall migration limits and specific migration limits for monomers and additives. Electrical/electronic assembly operations should verify that the finished adhesive is within the substance restrictions of RoHS Directive 2011/65/EU. REACH registration under Regulation (EC) No 1907/2006 applies to the polymer and additives supplied in the EU. These compliance obligations are formulation-dependent and must be confirmed with the supplier or contract laboratory.
| Standard or regulation | Test or requirement | Relevance to Greenflex HN 70 compounding |
|---|---|---|
| ISO 8985:1998 | Vinyl acetate content determination | Release test for comonomer level |
| ISO 1133-1:2022 | Melt mass-flow rate at 190 °C/2.16 kg | Hot-melt pump and coater selection |
| ISO 1183-1:2019 | Density by immersion or gas pycnometer | Feed calibration and shipping classification |
| ISO 868:2003 | Shore A hardness after 15 s | Bond flexibility indicator |
| ISO 527-2:2012 | Tensile strength and elongation at break | Cohesive strength assessment |
| ISO 3146:2022 | Melting temperature by capillary or hot-stage method | Minimum activation temperature |
| ISO 2555:2018 | Brookfield rotational viscosity | Adhesive melt viscosity after compounding |
| ASTM D4498 | Hot-melt adhesive creep resistance | Bond heat resistance under load |
| ASTM D1876 | T-peel resistance of adhesives | Peel adhesion on flexible substrates |
| 21 CFR 175.105 | Adhesives in indirect food contact | Formulation-dependent compliance |
| Regulation (EU) No 10/2011 | Plastic materials and articles intended to contact food | Migration limits apply for food packaging |
| REACH (EC) No 1907/2006 | Registration, evaluation, authorisation | Supply-chain information and SVHC screening |
| RoHS Directive 2011/65/EU | Restriction of hazardous substances | Electrical/electronic assembly operations |
