Ateva 1807EW EVA Copolymer Resin,18% VA,0.7 MI,Wire & Cable Grade,Low Residual

Ateva 1807EW is a low-residual ethylene-vinyl acetate copolymer with 18 wt% vinyl acetate and a melt flow rate of 0.7 g/10 min at 190 °C/2.16 kg according to ISO 1133-1:2022. The grade is placed in wire and cable compounding where the polar vinyl acetate repeat unit contributes to filler wetting, peroxide/silane crosslinking response, and low-smoke char formation, while the low residual catalyst fraction limits ionic impurity carryover into wet-electrical-ageing applications. All downstream compounds supplied into the EU are assessed under REACH and RoHS 2011/65/EU; the resin itself is addressed as a polymer within the applicable registration framework.

Silane-Grafted Moisture-Cured Photovoltaic Cable Insulation

In this segment, Ateva 1807EW is compounded as the silane-grafting vehicle before let-down into a moisture-crosslinkable photovoltaic insulation. The 18 wt% vinyl acetate content reduces crystalline amperometric modulus and improves low-temperature flexibility without displacing the silane-crosslinked LDPE network. The low residual fraction is relevant because trace transition-metal residues can accelerate oxidative chain scission during ISO 4892-2:2013 UV weathering and damp-heat testing. Insulation layers are qualified under EN 50620:2017 and EN 50618:2014 for single-core photovoltaic cables; low-smoke emission is tested by EN 61034-2, halogen-acid gas release by EN 60754-2, and long-term damp-heat performance by IEC 60068-2-78. The grafting formulation contains 100 phr Ateva 1807EW, vinyltrimethoxysilane at 1.5–2.5 phr, dicumyl peroxide at 0.1–0.3 phr, and a hindered phenolic antioxidant at 0.2–0.5 phr. The grafted batch is then blended with ungrafted LDPE or LLDPE to a final EVA content of 20–35 wt% in the insulation compound. Compounding is run on a corotating twin-screw extruder with 40:1 L/D, a barrel profile of 140–190 °C, vacuum devolatilisation below 50 mbar absolute, and an underwater pelletiser. On the wire line, the compound is applied by a 30:1 L/D single-screw extruder with compression ratio 1.8:1–2.5:1, melt temperature 155–180 °C, and insulation thickness 0.50–1.25 mm depending on voltage class. Moisture cure is completed in a hot chamber at 60–80 °C and ≥95 % relative humidity for 24–72 h. Finished product types include 1.5–35 mm² H1Z2Z2-K and PV1-F single-core solar cables, module interconnect leads, and array jumper assemblies.

In halogen-free sheathing lines producing building power cable, Ateva 1807EW is specified as the polar continuous phase in ATH/MDH-filled jackets because the vinyl acetate units reduce interfacial debonding between the polyolefin matrix and hydrated mineral fillers under bending and low-temperature impact. The primary regulatory route is CPR Euroclass Cca-s1a,d1a1 under EN 50575:2014+A1:2016, verified by EN 50399 heat release and flame spread testing, IEC 60332-3-24 vertical cable tray propagation, IEC 61034-2 smoke density, and IEC 60754-2 acid gas conductivity. A typical jacketing recipe contains 100 phr Ateva 1807EW, magnesium hydroxide at 120–180 phr, zinc borate at 10–20 phr, a silicone-acrylic impact modifier at 5–15 phr, an aminosilane coupling agent at 0.3–0.8 phr, and an antioxidant package at 0.5–1.0 phr. Silica-based processing aids are normally held below 2 phr to avoid torque instability at the feed section. Compounding begins in an internal mixer with a chamber temperature of 55–65 °C and a dump temperature of 150–165 °C, followed by a twin-screw extruder set to 150–180 °C and an 80–150 mesh screen pack. Sheathing is applied on a 25:1 L/D single-screw line with melt temperature 150–190 °C, head pressure 100–200 bar, and air-cooling over 5–10 m to control surface melt fracture. Pre-drying at 70 °C for 2–4 h is used when ambient relative humidity exceeds 60 %. The terminal product classes are N2XH and NHXMH low-smoke power cables, FRNC building installation cables, and flame-retardant multicore control cables covered by IEC 60502-1.

Does the Low Residual 18 wt% VA Grade Carry High Carbon Black in Peroxide-Cured MV Semiconductive Screens?

At medium-voltage extrusion lines, Ateva 1807EW is evaluated as a base polymer for conductor and insulation screens where its polar backbone accepts high-structure conductive carbon black without generating unacceptable volume resistivity drift after peroxide crosslinking. Screen layer requirements derive from IEC 60502-2:2014 for 6/10 kV to 18/30 kV XLPE cables, with semiconductive material testing under ASTM D3004-17 and volume resistivity measured by ASTM D991. The formulation uses 100 phr Ateva 1807EW, acetylene black or N550 conductive carbon black at 30–45 phr, dicumyl peroxide at 1.0–2.5 phr, an antioxidant at 0.3–0.8 phr, and an internal lubricant at 1–3 phr. The target volume resistivity is commonly controlled below 100 Ω·cm at 23 °C and below 500 Ω·cm at 90 °C for conductor screens, while insulation screens are permitted the upper portion of this range. Compounding uses a Banbury mixer with carbon black preheating to 60–80 °C to reduce agglomerate retention, followed by a two-roll mill and a pelletising extruder. Triple-head continuous vulcanisation lines apply the conductor screen at 0.6–1.2 mm, the XLPE insulation at 4.6–11.0 mm, and the insulation screen at 0.8–1.5 mm. Semicon extruder melt temperatures are maintained at 100–115 °C to avoid premature peroxide decomposition, while the CV tube operates at 1.0–1.8 MPa nitrogen pressure. A documented processing boundary is that semicon melt temperature above 120 °C produces surface scorch and increased die drool after 48 h continuous runs. Finished products are conductor and insulation screens for 6/10 kV, 12/20 kV, and 18/30 kV medium-voltage cables, including copper tape-screened and wire-screened designs.

Frequently used as a 20–30 wt% flexibilising comonomer in electron-beam crosslinked thin-wall automotive primary wire, Ateva 1807EW reduces crystalline modulus and improves strip compatibility on high-speed irradiation lines. The wire constructions are qualified to ISO 6722:2022 temperature classes, with flame testing under SAE J1128 and OEM specifications such as LV112. A representative blend consists of 20–30 wt% Ateva 1807EW, 60–70 wt% LDPE/LLDPE, trimethylolpropane triacrylate at 1.0–3.0 phr, a halogen-free flame-retardant package at 30–50 phr, and an antioxidant at 0.5–1.0 phr. The resin is melt-compounded and applied on a 24:1 L/D single-screw wire line at 135–165 °C, then extruded over stranded copper conductors at insulation thicknesses of 0.20–0.40 mm. Electron-beam irradiation follows at 40–120 kGy with wire speeds of 200–800 m/min, depending on accelerator current, multiple-pass geometry, and insulation mass per unit length. Hot-set tests at 200 °C and 15 min under 0.2 MPa are used to verify crosslink density and prevent reel-blocking after irradiation. Terminal finished products include FLR2Y and FLR9Y primary wires, thin-wall battery management system conductors, and sensor leads where halogen-free char integrity is required.

When Electron Beam Irradiated at 80–160 kGy, the Copolymer Functions as an Expansion-Stable Heat-Shrink Jacket

Processors manufacturing heat-shrink cable accessories use Ateva 1807EW in the outer jacket layer because the 0.7 g/10 min melt flow and narrow molecular weight distribution provide consistent bubble-free tube extrusion before radiation crosslinking. The product performance is controlled under IEC 60502-4:2010 for cable joints and terminations, IEEE 48-2020 for joint testing practices, and IEC 60684-3-100 for heat-shrink tubing specifications. Formulations are generally lean, with 70–80 wt% Ateva 1807EW, 20–30 wt% LDPE for crystalline shape retention, an antioxidant system at 1.0–2.0 phr, carbon black at 1–3 phr, and an ATH or phosphorus-based flame-retardant package at 30–60 phr where flammability rating is required. Tube extrusion temperatures range from 140–180 °C with a 1.6:1–2.2:1 compression screw and an in-line diameter gauge controlling wall thickness to ±0.05 mm. The extruded tube is crosslinked by electron beam at 80–160 kGy, then heated to 130–150 °C and expanded 2:1 to 4:1 over a cooled mandrel to freeze the expanded shape. Published data for the exact expansion-force hysteresis of this grade in accessory formulations is limited; manufacturers therefore validate recovery force and longitudinal shrinkage on each lot using 200 °C oil immersion and 5 min recovery tests. End products are heat-shrinkable outer sleeves for 0.6/1 kV and 12/20 kV cable accessory kits, breakouts, and busbar insulation tubes.

Because the 0.7 g/10 min melt flow of Ateva 1807EW permits high-fill calcium carbonate and ATH compounds to be extruded without excessive head pressure, the grade is metered into thermoplastic bedding compounds for multicore industrial cables. The application must satisfy construction and flame-retardation checks in IEC 60502-1:2020 for low-voltage power cables up to 1 kV, with single-cable flame propagation verified under IEC 60332-1-2 and smoke emission measured by IEC 61034-2. A representative bedding recipe contains 100 phr Ateva 1807EW, calcium carbonate at 60–100 phr, ATH at 30–80 phr, carbon black at 1–2 phr, an antioxidant at 0.5–1.0 phr, and a paraffinic processing aid at 3–8 phr. The compound is produced on a corotating twin-screw extruder with 36:1 L/D, a side feeder for mineral fillers, and vacuum venting below 80 mbar; the melt is filtered through an 80–120 mesh screen pack and pelletised. On the cable line, a low-compression screw at 1.4:1–1.8:1 in a 20:1–25:1 L/D single-screw extruder delivers the compound into the interstices of twisted cores at 140–170 °C, followed by water-cooling below 40 °C to prevent post-extrusion shrinkage. Terminal product types are filled bedding cores for 2-core to 5-core low-voltage power cables, instrumentation cables, and tray cables requiring a compact circular profile under IEC 60502-1.