EVAtech EVA 110S /3N /1 Copolímero de acetato de etileno e vinil

Hot-melt adhesive formulations incorporating EVAtech EVA 110S/3N/1 are compounded with tackifiers and waxes to balance open time, set speed, and adhesive peel strength. A representative formulation window contains 25–35 wt% EVA copolymer, 30–45 wt% hydrogenated hydrocarbon resin or rosin ester, 15–30 wt% microcrystalline wax, and 0.5–1.0 wt% hindered phenolic antioxidant. The mixer is a jacketed sigma-blade vessel run at 150–175°C under a nitrogen blanket; discharge viscosity is checked by ASTM D3236-15 at 160–180°C and maintained between 1,200–2,400 mPa·s. Ram discharge passes through a heated melt pump into a strand pelletizer, with pellet temperature kept below 40°C to prevent blocking. Low vinyl acetate content, as declared on the batch certificate by ASTM D5594-18, reduces specific adhesion to aluminum and OPP relative to higher vinyl acetate grades but increases thermal stability at application temperatures up to 200°C. For indirect food-contact use, the finished adhesive must satisfy FDA 21 CFR 175.105 and EU Regulation (EC) No 1935/2004. End products include carton-side seam sealing, case erecting, bookbinding, and laminate construction. Lot-specific melt flow rate should be measured by ISO 1133-1:2022 before setting the wax-to-tackifier ratio; published data for this specific 110S/3N/1 configuration is limited and must be supplemented with a supplier certificate.

Dwell-Pressure Thresholds in EVA-Based Moulded Foam Footwear Soles

When EVAtech EVA 110S/3N/1 is used as a hardness modifier in blended EVA footwear compounds, the polymer fraction is typically combined with a higher vinyl acetate EVA resin, with 110S/3N/1 held at 10–30 wt% of the polymer phase to avoid over-stiffening and incomplete expansion. The batch is mixed in an internal mixer with a ram pressure of 0.5–0.7 MPa and a drop temperature of 105–120°C, followed by two-roll milling at 90–100°C. Crosslinking is initiated with dicumyl peroxide at 0.7–1.2 phr; azodicarbonamide blowing agent is dosed at 2.8–4.2 phr; zinc oxide at 1.0–1.5 phr and stearic acid at 0.5–0.8 phr serve as activator and release control. Amine-based stabilizers are excluded from the cure package because they scavenge the free radicals required for crosslinking. Expansion and curing occur in a compression press at 165–175°C under 150–200 kg/cm² for 8–12 min. The resulting foam is conditioned for 24 h at 23±2°C and 50±5% RH before testing. Hardness is measured by ISO 7619-1:2010 on an Asker C scale, tear resistance by ASTM D624-00 or DIN 53516, and flex fatigue by the Ross flex test under ISO 4643:2010. Compliance for this footwear sector includes REACH Regulation (EC) No 1907/2006 Annex XVII restrictions on phthalates and polycyclic aromatic hydrocarbons, and Directive 2011/65/EU RoHS where applicable. Terminal products include injection-moulded sport shoe midsoles, compression-moulded sandal sheets, and unit soles. The processing window is narrow because premature crosslinking in the mixer above 125°C raises compound viscosity and destroys cell uniformity; residence time must not exceed 7–9 min in the internal mixer once peroxide is added.

Halogen-free flame-retardant cable compounds built on EVAtech EVA 110S/3N/1 are processed with aluminum trihydrate and, in some grades, a secondary magnesium dihydrate filler. The upper processing temperature is constrained by ATH dehydration onset near 180–210°C and by EVA deacetylation acceleration above 230°C; barrel setpoints from feed to die are therefore maintained at 130/140/150/160/170/175°C on a 36–44 L/D co-rotating twin-screw extruder. The EVA copolymer contributes to char structure during combustion due to elimination of acetic acid from vinyl acetate units, while the 3N/1 additive package provides processing stabilization and demolding behavior. Residual moisture in the EVA pellets is kept below 0.05% by Karl Fischer titration before extrusion to avoid ATH hydrolysis degradation. Screw speed is set between 250–400 rpm depending on extruder diameter, and specific mechanical energy is kept below 0.25 kWh/kg to limit local shear heating. End products include building wire insulation and outer jacketing for low-smoke zero-halogen cables.

Flame retardancy is verified by limited oxygen index ISO 4589-2:2017, vertical flame propagation IEC 60332-1-2:2015, smoke density IEC 61034-2:2019, and halogen acid gas release IEC 60754-1:2011 and IEC 60754-2:2019. Tensile properties are measured by ASTM D638-14 after extrusion; elongation at break typically falls below 350% in 60 wt% filler compounds, requiring a minimum EVA/LLDPE ratio of 1.5:1 for process stability in thin-wall sheathing. Compound temperature at the die should not exceed 190°C; higher readings cause surface roughness and pre-drying is required when storage relative humidity exceeds 60%. Amine-terminated stabilizers are incompatible in this system because they can promote premature deacetylation and crosslinking in the EVA phase.

What Processing Window Changes Emerge When 110S/3N/1 Enters a Multilayer Barrier Film Coextrusion Line?

In extrusion coating and lamination, EVAtech EVA 110S/3N/1 is extruded at melt temperatures between 260°C and 295°C to achieve oxidative stability and adhesion to substrates; the exact melt temperature depends on substrate thermal sensitivity and the melt flow rate reported under ISO 1133-1:2022. Coating onto corona-treated PET, aluminum foil, or paper requires a substrate surface energy of 42–46 dyn/cm, measured by ISO 8296:2003; a 3N/1 slip package controls coefficient of friction below 0.4 by ISO 8295:1995 in the final laminate. The extrusion line is typically a single-screw extruder with 24–30 L/D and a barrier screw, feeding a slot die with an opening of 0.5–0.8 mm; coating weight is controlled between 15–30 g/m² for sachets and lidding films. Line speeds from 120–350 m/min are used, with higher speeds requiring a melt flow rate at the upper end of the grade specification. End products include retort lidding, condiment sachets, aseptic brick laminates, and medical peelable webs. Compliance for these food-contact structures is evaluated under Commission Regulation (EU) No 10/2011 for plastics intended for food contact and FDA 21 CFR 177.1350 for ethylene-vinyl acetate copolymers.

Agricultural cladding film incorporating EVAtech EVA 110S/3N/1 is coextruded in three-layer blown-film lines with die diameters from 100–250 mm, die gaps of 1.6–2.2 mm, and blow-up ratios between 2.0 and 2.8. The EVA is dosed into the middle or outer layer at 10–20 wt% of the total film, with the balance split between LLDPE and LDPE; this modification reduces low-temperature brittleness measured by ISO 527-3:2018 at -20°C and lessens stress whitening in folded edges. Film thickness for greenhouse and tunnel covers is maintained at 150–200 μm. Melt temperature is held at 190–210°C to limit acetic acid evolution. The film is tested for tensile stress at break by ISO 527-3:2018, tear resistance by ISO 6383-2:1983, light transmittance by ISO 13468-1:2019, and haze by ASTM D1003-21. Compliance for agricultural films is substantiated under EN 13206:2017 for covering thermoplastic films and REACH Regulation (EC) No 1907/2006. End products include multi-season greenhouse outer covers, low tunnels, and silage pit covers. The narrow processing band arises because EVA with low vinyl acetate content can generate acetic acid at high residence time; frost-line height is set at 1.5–2.0 times the die diameter to stabilize bubble cooling.

When 110S/3N/1 Forms the Carrier Matrix for High-Stability Polyolefin Masterbatches

In masterbatch production, EVAtech EVA 110S/3N/1 serves as a carrier for organic pigments, carbon black, and slip or antiblock concentrates because the vinyl acetate comonomer increases pigment wetting compared to pure LDPE while preserving compatibility with polyethylene let-down. Pigment loading is set at 20–60 wt% depending on color strength requirements; the carrier is dosed at 30–60 wt%, with the balance consisting of wax dispersants and processing aids. Compounding is performed on a co-rotating twin-screw extruder with 40–50 L/D, side feeding the pigment downstream after polymer melting; barrel temperatures are staged from 160°C at the feed zone to 200–220°C at the die, and screw speed is maintained at 400–600 rpm. Specific energy input ranges from 0.15–0.35 kWh/kg; the 3N/1 stabilizer package controls melt viscosity drift below 8% after 10 min residence time in a Brabender torque rheometer at 200°C. Let-down ratios in film and injection moulding are typically 2–5 wt% of compounded masterbatch. Compliance for color concentrates includes REACH Annex XVII and, where applicable, EN 71-3:2019 migration limits for toys; published data for this exact carrier grade in high-carbon-black masterbatch is limited, so production trials with lot-specific melt flow rate and pigment oil absorption are required. End products include masterbatch pellets for polyethylene film, thin-wall injection moulded packaging, and blow-moulded containers.