| HS Code | 226975 |
| Vinyl Acetate Content | 12% |
| Melt Flow Rate | 8 g/10 min (190°C, 2.16 kg) |
| Density | 0.940 g/cm³ |
| Melting Point | 95°C |
| Vicat Softening Temperature | 70°C |
| Tensile Strength | 14 MPa |
| Elongation At Break | 650% |
| Shore Hardness | D50 |
| Flexural Modulus | 70 MPa |
| Brittle Temperature | -76°C |
| Glass Transition Temperature | -35°C |
| Thermal Conductivity | 0.34 W/m·K |
As an accredited EVAtech EVA 120S/8 Ethylene Vinyl Acetate Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | EVAtech EVA 120S/8 Ethylene Vinyl Acetate Copolymer is supplied in 25 kg polyethylene bags, palletized and shrink-wrapped for safe handling and transport. |
| Container Loading (20′ FCL) | EVAtech EVA 120S/8 copolymer pellets are loaded into a 20′ FCL, secured in sealed bags, preventing moisture and contamination. |
| Shipping | EVAtech EVA 120S/8 is shipped as non-hazardous polymer pellets in sealed multi-wall bags on shrink-wrapped pallets. Keep dry, away from direct sunlight and excessive heat to prevent caking. Store in ventilated area, protect bags from tearing and puncture during transport. Full container or standard flatbed truckloads are typical. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, and open flames. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid contact with strong oxidizers. Maintain temperatures below 30°C (86°F). Under these conditions, shelf life is typically 12 months from production date. |
| Shelf Life | Shelf life is typically 2 years when stored in original, unopened packaging under dry, cool conditions. |
In hot-melt adhesive compounding, the nominal 12 wt% vinyl acetate content and 8 g/10 min melt flow rate measured at 190°C/2.16 kg under ISO 1133-1:2022 place EVAtech EVA 120S/8 in packaging side-seam and bookbinding systems where wax compatibility, substrate wetting, and low-temperature toughness are required. In a corrugated case-sealing formulation, the copolymer is incorporated at 20–35 wt%, C5 or rosin ester tackifier at 35–45 wt%, paraffin or Fischer-Tropsch wax at 5–15 wt%, and hindered phenolic antioxidant at 0.2–0.5 wt%; the addition ratio is adjusted within this range to hold Brookfield viscosity between 800 mPa·s and 2500 mPa·s at 180°C. Continuous compounding is performed on a 48:1 L/D co-rotating twin-screw extruder at 120–160°C, with 200-mesh melt filtration and slot-nozzle application at 160–180°C. Production-scale adhesive lines exhibit nozzle coking and stringing when cumulative residence time above 180°C exceeds 90–120 min, a failure mode traced to vinyl acetate scission to acetic acid. Indirect food-contact adhesive compliance is evaluated under 21 CFR 175.105, with migration testing according to EN 1186-1:2002 where EU 10/2011 applies. Terminal article types include corrugated case and carton sealing, perfect-bound book blocks, and paperboard tray assembly.
A reduction in seal initiation temperature is obtained when EVA 120S/8 is let down into low-density polyethylene at 15–30 wt%, with slip concentrate at 0.05–0.10 wt% and antiblock concentrate at 0.15–0.25 wt%. The vinyl acetate fraction lowers seal initiation by 8–15°C relative to unmodified LDPE when measured by hot tack and seal strength under ASTM F1921-18 and ASTM F88-21, with typical target seal strength above 2.5 N/15 mm. Downstream processing is performed on a three-layer blown film or cast line with a 250 mm die, 1.8 mm die gap, blow-up ratio 2.0:1, melt temperature 215–235°C, and corona treatment to 38–42 mN/m. The sealant web is coextruded with EVOH or polyamide barrier layers and is not suitable as a direct food-contact surface unless the final structure meets overall and specific migration limits under EU 10/2011. Resin compliance is assessed under 21 CFR 177.1350 and REACH Regulation EC No 1907/2006. Pre-drying at 60–70°C for 2–4 h is required when ambient relative humidity exceeds 60%; pellet moisture above 0.05 wt% produces bubble defects in the sealant web and gauge variance on cast film lines. Terminal articles include frozen vegetable pouches, medical device overwrap, and form-fill-seal snack laminates.
For additive masterbatches requiring a high-flow carrier with broad polyolefin compatibility and pigment wetting, EVA 120S/8 is incorporated at 30–38 wt% in a 40 wt% carbon black masterbatch, together with 4–6 wt% polyethylene wax dispersant and 0.2–0.4 wt% hindered phenolic antioxidant. When carbon black loading is increased to 45 wt%, the carrier fraction is reduced to 25–30 wt% to control melt impedance and prevent excessive screen-pack pressure. Compounding is conducted on a 44:1 L/D co-rotating twin-screw extruder with carbon black side-feeding at barrel zone 5, screw speed 400–600 min⁻¹, specific energy input 0.18–0.25 kWh/kg, melt temperature 170–185°C, and water-ring pelletizing at a maximum cooling-water temperature of 35°C. Filter pressure excursions above 8 MPa are observed when carbon black is introduced before a stable polymer melt seal is established in the side-feed zone. Regulatory compliance is assessed under RoHS Directive 2011/65/EU Annex II, REACH SVHC screening, and EN 71-3:2019 where the masterbatch may enter toy-related packaging. The carrier is incompatible with PET and polyamide matrices because of polarity differences, and pellet blocking during warehouse storage occurs when pelletizing water temperature exceeds 35°C. Terminal product types include carbon black masterbatch pellets for agricultural and construction films, color concentrates for injection molding, and additive masterbatches for extrusion coating lines.
Halogen-free flame-retardant cable jacket compounds use EVA 120S/8 at 10–25 wt% of total compound as a polar char-forming modifier, blended with LLDPE at 10–25 wt%, POE at 10–20 wt%, ATH or MDH flame retardant at 50–60 wt%, zinc borate at 2–5 wt%, and processing stabilizer at 0.3–0.6 wt%. The copolymer fraction improves filler wetting and raises limited oxygen index, but the processing window is confined to 160–175°C because ATH dehydration begins above 180°C; vent-port blockage and surface pinholes appear on 52:1 L/D twin-screw compounding lines when barrel temperature exceeds this limit. Cable extrusion is performed on a single-screw line with crosshead die, melt pressure 8–12 MPa, and water cooling at 30–40°C. Regulatory testing includes acid gas content to IEC 60754-1:2011, smoke density to IEC 61034-2:2005, limited oxygen index to ISO 4589-2:2017, tensile properties to IEC 60811-501:2012, and hazardous substance restrictions to RoHS Directive 2011/65/EU. Terminal products are low-voltage building wire sheathing, photovoltaic cable jackets, and industrial control cable outer sheaths. Amine-based stabilizer combinations should be avoided because residual amines accelerate ester hydrolysis at cable extrusion temperatures, producing surface migration and reduced insulation resistance.
Compound expansion in closed-cell EVA midsoles begins with EVA 120S/8 as the base resin at 100 phr, combined with azodicarbonamide blowing agent at 3.0–4.5 phr, dicumyl peroxide at 0.6–1.0 phr, zinc oxide at 1.0–1.5 phr, and zinc stearate at 0.5–1.0 phr. Mixing is carried out in an internal mixer at 105–115°C with ram pressure 0.6 MPa, followed by two-roll mill sheet-out at 90–105°C. Compression molding proceeds at 150–160°C under 15 MPa for 8–10 min; injection molding uses clamp force 600–1200 kN and mold temperature 165–175°C. Final density is controlled between 0.15 g/cm³ and 0.25 g/cm³ measured by ISO 1183-1:2019, with compression set to ISO 815-1:2014, tear strength to ISO 34-1:2015, and rebound to ISO 8307:2018. Regulatory compliance is managed through REACH Regulation EC No 1907/2006 Annex XVII restricted substance screening. A critical operational boundary is the onset of dicumyl peroxide decomposition above 115°C; premature microporous defects and batch-to-batch density variance of ±0.03 g/cm³ are associated with local hot spots during Banbury mixing. Terminal articles are running shoe midsoles, insole components, and sandal footbeds.
In extruded sealing profiles for appliance and transport interiors, EVA 120S/8 is blended at 20–35 wt% with PP or EPDM-rich TPE compounds, reducing Shore A hardness by 8–12 points measured to ISO 868:2003 and improving low-temperature impact at −20°C to −30°C tested by ISO 179-1:2010. The balance of the compound may contain polyolefin matrix at 40–55 wt%, EPDM at 10–20 wt%, paraffinic oil at 5–10 wt%, and antioxidant at 0.3–0.5 wt%. Profile extrusion is performed on a 30:1 L/D counter-rotating twin-screw extruder with vacuum degassing at barrel zone 8, melt temperature 190–210°C, calibration sleeve at 20°C, and haul-off speed 8–15 m/min. Edge tearing at the calibration unit occurs when melt temperature exceeds 210°C due to reduced melt strength in the EVA-rich phase. Long-term heat aging is evaluated according to ISO 188:2011, and automotive interior approvals require REACH SVHC screening as well as RoHS Directive 2011/65/EU for electrical-adjacent components. Terminal articles include refrigerator door gaskets, automotive door weatherstrip, and cable protection profiles. Published data for this specific gloss and scratch-resistance configuration is limited; surface property targets therefore require line trials before final specification release.
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Ethylene vinyl acetate copolymer EVAtech EVA 120S/8 is supplied as a pelletised extrusion and injection-moulding grade in which the designation 120S identifies a nominal vinyl acetate content of 12 wt% and the suffix 8 identifies a melt flow rate of 8 g/10 min measured at 190 °C under a 2.16 kg load in accordance with ISO 1133-1:2022. Density at 23 °C is typically 0.93 g/cm3 when tested by ISO 1183-1:2019. The 12 wt% vinyl acetate comonomer disrupts polyethylene chain ordering, reducing crystallinity, lowering the crystalline melting range to approximately 92–95 °C, and improving impact toughness and environmental stress-crack resistance relative to LDPE while retaining sufficient stiffness for technical components. Published data for the exact EVAtech 120S/8 configuration is limited; comparable 12% VA/8 MFR copolymers exhibit tensile yield stress of 8–12 MPa under ASTM D638-14 Type IV at 50 mm/min, elongation at break above 700%, and Shore D hardness of 40–45 after 24 h conditioning at 23 °C and 50% RH per ISO 868. The grade is applied in injection-moulded industrial parts, profile extrusion, crosslinked foam, and masterbatch carrier systems where intermediate comonomer polarity and medium melt viscosity are required.
Deacetylation of the vinyl acetate comonomer proceeds autocatalytically above 220 °C and accelerates when melt residence time exceeds 10 min at temperature. On a single-screw extruder with a 30:1 L/D barrier screw and 2.5:1–3.0:1 compression ratio, a production-scale barrel profile is set as follows: feed throat 40–60 °C, zone 1 150–170 °C, zone 2 170–180 °C, zone 3 180–190 °C, die 190–200 °C. Melt temperature measured by an immersible thermocouple at the die is kept below 210 °C. Screw speed on a 60 mm extruder is typically 50–80 rpm, with output of 90–140 kg/h reported for comparable 8 MFR EVA grades; throughput data specific to the exact 120S/8 grade has not been published in sufficient detail. Melt viscosity of comparable 12 wt% VA/8 MFR copolymers at 190 °C and 100 s−1 is reported between 400 and 700 Pa·s, which produces moderate back pressure and requires a breaker plate with a 60/80/100 mesh screen pack to retain degraded gel particles. Pre-drying at 60–70 °C for 2–4 h in a dehumidifying hopper dryer with a dew point of −40 °C is required when surface moisture exceeds 0.05 wt% by Karl Fischer titration. Moisture above this threshold releases acetic acid during processing and corrodes downstream tooling. Dead spots, long adapters, and poorly streamlined die entries are eliminated because stagnant melt degrades and black specks can appear within 15–20 min of hot shutdown. Purging with LDPE or HDPE before shutdown displaces EVA and reduces carbonised deposits.
During injection moulding, EVA 120S/8 is processed at melt temperatures of 190–210 °C and mould temperatures of 20–40 °C. The semi-crystalline solidification behaviour produces shrinkage of 1.5–2.0% in the flow direction and 1.0–1.5% transverse to flow; the 8 g/10 min MFR causes faster pressure decay than a 2 g/10 min grade, so gate dimensions and hold-pressure duration must be revalidated. Screw back pressure is set between 5 and 10 bar hydraulic, and hold pressure is typically 40–60 MPa specific pressure when gated components exceed 3 mm wall thickness. Tools should include cold slug wells and vents of 0.02–0.03 mm depth to release low-level acetic acid volatiles; vented barrels are not required under normal dried conditions. Clamp force requirement is approximately 2.5–3.5 kN/cm2 of projected area as a starting point. Compared with polypropylene, EVA 120S/8 requires lower melt temperature and higher mould release taper because the softer part has lower hot modulus and may adhere in deep ribs. A demoulding additive such as zinc stearate at 0.1–0.3 phr is incorporated where ejection forces are high.
Substitution of an 18 wt% vinyl acetate grade by EVA 120S/8 changes stiffness, low-temperature flexibility, and surface tack. The 12 wt% VA grade exhibits higher Shore D hardness, lower elongation at break, higher flexural modulus, and reduced low-temperature impact relative to the 18 wt% VA grade; it also reduces blocking, improves scratch resistance, and maintains dimensional stability in warm storage. The lower comonomer content shifts the glass transition region upward by approximately 2–4 °C, which narrows low-temperature impact performance below −30 °C. Peel adhesion to EVA-based compounds after surface roughening and solvent wiping is generally lower, so primer selection and bonding cycles require revalidation when changing grades. Quantitative differences are summarised in Table 1. Published data for the exact EVAtech 120S/8 configuration is limited; values are typical ranges for commercial EVA copolymers of equivalent composition and flow.
| Property | EVA 120S/8 typical | EVA 18% VA / 2 MFR typical | Test method |
|---|---|---|---|
| Vinyl acetate content | 12 wt% | 18 wt% | internal FTIR |
| Melt flow rate | 8 g/10 min | 2 g/10 min | ISO 1133-1:2022 |
| Density | 0.93 g/cm3 | 0.94 g/cm3 | ISO 1183-1:2019 |
| Shore D hardness | 40–45 | 32–38 | ISO 868 |
| Tensile yield stress | 8–12 MPa | 5–8 MPa | ASTM D638-14 |
| Elongation at break | 700–800% | 750–900% | ASTM D638-14 |
| Flexural modulus | 60–90 MPa | 30–50 MPa | ISO 178 |
| Vicat softening temperature | 60–70 °C | 45–55 °C | ISO 306 A50 |
Regulatory status must be confirmed through the supplier’s product stewardship documentation before commercial use. Ethylene vinyl acetate copolymers of this type may comply with FDA 21 CFR 177.1350 for food-contact applications when the finished article meets the specified end-use temperature and food-type restrictions; EVA 120S/8 has not been evaluated here for specific food-contact migration limits. Under EU 10/2011, overall migration testing according to EN 1186 and specific migration of vinyl acetate monomer must be completed on the final article. Compliance with REACH substance registration and RoHS 2011/65/EU depends on the absence of restricted heavy metals and phthalates in the supplied compound. Known incompatibilities include amine-based heat stabilisers and amine-functional slip additives, which interfere with peroxide crosslinking and can cause discolouration. Calcium oxide desiccants at high loading reduce foaming efficiency. Contact with copper or brass at melt temperatures above 200 °C can catalyse deacetylation; stainless steel or chrome-plated surfaces are used in screws, dies, and calender rolls. Storage in direct sunlight or above 30 °C accelerates blocking and antioxidant depletion. The product has limited resistance to strong oxidising acids, aromatic hydrocarbons, and chlorinated solvents.
On two-roll mills operating at 90–100 °C, EVA 120S/8 is compounded with dicumyl peroxide at 0.5–1.2 phr, azodicarbonamide at 2.5–4.5 phr, zinc oxide at 1.0–2.0 phr, and stearic acid at 0.5–1.0 phr to produce crosslinked foam sheet. The order of addition affects crosslinking agent dispersion; dicumyl peroxide is added after the EVA band is formed and after fillers to avoid premature cure. Mill nip gap is maintained at 2–4 mm with a friction ratio of 1:1.15–1:1.25. Compound strip temperature before press cure is kept below 100 °C because dicumyl peroxide begins rapid decomposition above approximately 130 °C. Expansion and cure in a compression press use 155–165 °C for 8–12 min at 10–15 MPa. Cured foam density is controlled from 0.12 to 0.25 g/cm3 depending on blowing agent loading and sheet thickness, measured by ISO 845. Compression set at 50% deflection after 24 h at 23 °C is typically 20–35% for comparable crosslinked EVA foams, while after 24 h at 50 °C it increases to 40–60%; published data for the exact 120S/8 grade is limited. The 8 g/10 min MFR gives lower melt strength than a 2 g/10 min grade, so blowing agent decomposition temperature and crosslink rate must be balanced to prevent cell coalescence and collapse. Reducing mould pressure or increasing cure time is preferred over raising temperature above 170 °C because elevated temperature accelerates deacetylation.
Where high-shear dispersion into masterbatch carrier resins is required, EVA 120S/8 functions as a viscosity-moderate carrier with better filler wetting than LDPE and lower tack than high-VA EVA. In co-rotating twin-screw compounding with a 40:1 L/D extruder, pigment or carbon black loadings of 20–40 wt% are distributed at screw speeds of 300–600 rpm and melt temperatures of 180–200 °C. The 12 wt% vinyl acetate content provides sufficient polarity for dispersed organic pigments without the high adhesion to chute walls and pelletiser strands seen with 25–28 wt% VA carrier resins. The resulting masterbatch is let down at 2–5 wt% in polyethylene and EVA moulding compounds. Because the carrier MFR is 8 g/10 min, dispersion occurs at lower back pressure than with 2 MFR carriers, but pellet hardness is lower and strand cooling must be completed before pelletising.
