Ateva 2803W EVA Copolymer Resin,28% VA,3 MI,Grau de fio e cabo,Baixo resíduo

Ateva 2803W is let down with aluminium trihydrate and magnesium dihydrate in a co-rotating twin-screw extruder having a screw diameter of 75 mm and an L/D ratio of 44:1, with side feed capability positioned downstream of the polymer melting zone so that filler is added only after the EVA phase has been fully plasticated. The addition ratio of Ateva 2803W in halogen-free flame-retardant sheathing compounds commonly falls between 20 wt% and 35 wt% of total formulation, while the total ATH/MDH filler loading is maintained at 150–180 phr on 100 phr polymer. The 28% vinyl acetate content of Ateva 2803W supplies sufficient polar repeat units to wet ATH/MDH surfaces and reduce interfacial void formation without producing the excessive tack and plateout observed with higher vinyl acetate grades at cable extrusion temperatures. The 3 g/10 min melt flow rate, measured according to ISO 1133-1, is low enough to retain compression resistance after sheathing and high enough to permit a 90 mm single-screw extruder to maintain a head pressure below 250 bar with a 200/400/200 mesh breaker plate pack. Pre-drying at 70 °C for 2 hours is required when ambient relative humidity exceeds 60%, because moisture absorbed in the vinyl acetate phase can produce surface roughness and internal microvoids in the jacket. A vacuum vent at the second mixing zone of the twin-screw compounder is operated at −0.08 MPa gauge pressure to strip residual water from the melt before the die face. The low residual catalyst package reduces acetic acid evolution at the die lip and suppresses the formation of hard deposits on the die face during long production runs. Finished compounds are evaluated against IEC 60754-1 and IEC 60754-2 for halogen acid gas and acidity of combustion gases, IEC 61034-2 for smoke density, IEC 60332-3-24 for vertical flame propagation on bundled cables, and IEC 60502-1 for sheathed power cables rated from 1 kV to 30 kV. The terminal product is a halogen-free outer sheath on station power cables and control cables used in underground railways, power distribution buildings, and data centre feeders, where low smoke, low acid gas, and acceptable mechanical strength are specified simultaneously.

In medium-voltage XLPE-insulated cable construction, Ateva 2803W is incorporated into the strippable semiconductive insulation screen compound as the carrier resin at 30–40 wt%, with conductive carbon black such as N550 or acetylene black at 28–35 wt%, an antioxidant system at 0.5–1.5 phr, and a processing lubricant at 1–3 phr. The compound is manufactured in a twin-screw mixer and then pelletised for use on a three-extruder triple-layer crosshead, where the Ateva 2803W-based screen layer is applied over XLPE insulation at a nominal thickness of 0.5–1.5 mm. Melt filtration through 325 mesh screen packs is used to remove carbon black agglomerates larger than 45 µm; oversized particles can create local electric field enhancements and cause partial discharge failures in high-voltage cable. The 28% vinyl acetate content provides controlled polarity for adhesion to the XLPE core, and strippability is adjusted by the ratio of Ateva 2803W to low-polarity polyolefin modifiers rather than by changing the carbon black grade alone. The 3 g/10 min melt flow allows the semiconductive compound to be extruded without excessive shear heating, which is material because overheating degrades the antioxidant package and increases carbon black dispersion defects at the screen-insulation interface. The low residual catalyst package lowers the ionic impurity concentration in the semiconductive layer, contributing to stable dielectric performance when the finished cable is subjected to IEC 60840 partial discharge testing at 1.5 U₀ for 30 min and IEC 60502-2 type tests. Surface smoothness and volume resistivity of the semiconductive layer are verified according to ASTM D3004-20. Terminal products are MV and HV power cable semiconductive screens for utilities and industrial installations, typically rated up to 36 kV for MV and higher for HV designs, where the screen must strip cleanly with a controlled force and leave no carbon black residue on the insulation surface. Published data for the exact stripping force profile of Ateva 2803W-based semiconductive compounds at different polyolefin modifier loadings is limited; therefore, each cable producer validates the formulation on the actual triple-layer extrusion line before full production.

When Low Residual Catalyst Content Limits Outgassing in EB-Crosslinked Heat-Shrink Sleeves

Heat-shrinkable sleeves for low-voltage and medium-voltage cable joints employ Ateva 2803W at 70–100 phr as the base resin, with low-density polyethylene or linear low-density polyethylene at 0–30 phr to adjust dimensional stability and recovery force. The compound is extruded into tube or sheet form on a single-screw extruder with a length/diameter ratio of 30:1, using a barrier screw with a compression ratio between 2.5:1 and 3.5:1 to avoid melt fracture at the low melt temperatures required for controlled distortion during expansion. The extrudate is then crosslinked by electron beam irradiation at a dose level determined through gel content testing; the target gel fraction is generally set between 40% and 70% depending on the shrink ratio and recovery force specification. The irradiated tube is heated above the crystalline melt temperature of the 28% vinyl acetate EVA phase and expanded by vacuum or internal air pressure, then cooled in the expanded state. Low residual catalyst and low volatile content minimise gas voids and surface defects during irradiation and during the recovery process at installation temperatures of 120–135 °C. Compliance is assessed under IEC 60684-3-247 for heat-shrink sleeving and IEC 60684-2 for test methods, while flame-retardant variants are evaluated under UL 224 VW-1. The terminal products are heat-shrinkable insulation and sealing sleeves for cable joints, terminations, and busbar insulation, where the recovered sleeve must retain longitudinal shrinkage below the maximum allowed by the accessory manufacturer after full recovery. Published data for the precise electron beam dose window of Ateva 2803W in 70–100 phr formulations is limited, so each compound must be mapped on the specific accelerator at the target line speed to avoid under-crosslinking or surface oxidation.

For photovoltaic array wire produced under IEC 62930 and EN 50618, Ateva 2803W is formulated at 15–40 phr in the jacket compound together with halogen-free flame retardants, processing stabilisers, and crosslinking co-agents such as triallyl cyanurate or trimethylolpropane trimethacrylate at 0.5–2 phr. The compound is extruded around a tinned copper conductor and XLPE insulation using a 60–90 mm single-screw extruder with a shallow compression screw, a 200/400/200 mesh filter pack, and low-draw vacuum venting. Electron beam irradiation is applied to achieve hot-set elongation below 175% under 0.2 MPa load at 200 °C as specified in IEC 62930; the exact dose is compound-specific and must be tuned against accelerator energy, beam current, and line speed. The 28% vinyl acetate content of Ateva 2803W contributes to low-temperature flexibility and filler wetting, while the 3 g/10 min melt flow allows thin-wall jacket extrusion at 0.6–1.2 mm nominal thickness without excessive head pressure. Low residual catalyst reduces microvoid formation during irradiation, which is relevant where the cable experiences daily thermal cycling on rooftop installations. Terminal products are PV1-F type solar cables and halogen-free photovoltaic wires rated for 1.5 kV DC or higher, installed in solar arrays and inverter connections where UV resistance, long-term wet ageing per EN 50618 clause 5.8, and dynamic penetration resistance per IEC 62930 clause 9 must be demonstrated. UL 4703 applies where North American installation codes are specified.

What Role Does a 3 MI EVA Serve in Irradiation-Crosslinked EV Charging Cable Jackets?

In electric vehicle charging cable jacket development, Ateva 2803W is used at 20–35 wt% of the total polymer phase in flexible LSZH jackets for mode 3 and mode 4 electric vehicle charging cables under IEC 62893-2 and EN 50620. The compound is processed on a 45–75 mm single-screw extruder with a temperature profile rising from 150 °C at the feed throat to 195 °C at the die, using a gear pump to maintain uniform wall thickness at 0.8–1.5 mm. The 3 g/10 min melt flow permits high-speed jacketing of complex multi-conductor assemblies without creating internal voids at the interstices; however, the same flow value can cause sag in thick sections, so screw speed and haul-off tension must be controlled within a narrow window. The 28% vinyl acetate content increases compatibility with phosphate-based and metal-hydrate flame-retardant systems and reduces the stiffness increase observed with highly filled compounds. Low residual catalyst is relevant for charging cables because ionic decomposition products can migrate to the connector contact surfaces and contribute to surface resistivity changes under humid conditions. The finished jacket is tested for low-temperature flexibility at −40 °C, long-term heat resistance at 105 °C or 125 °C depending on cable class, and flame propagation per IEC 62893-1, IEC 62893-2, and UL 62 VW-1 where applicable. Terminal products are flexible EV charging cable outer sheaths for AC and DC charging stations, including Type 2 and CCS configurations, where mechanical robustness must survive repeated coiling, vehicle runover, and outdoor immersion. The exact ratio of Ateva 2803W to elastomer co-resins must be customised because published data for complete formulation performance across all EV cable classes is limited and varies with connector and vehicle OEM specifications.

Marine Cable Bedding Compounds Must Fill Interstices Without Over-Compressing the Core

In marine and offshore cable manufacturing, halogen-free bedding and filler layers are formulated with Ateva 2803W at 25–35 wt% of the compound, using calcium carbonate, ATH, and processing oils to achieve a soft intermediate layer between the conductor assembly and the outer sheath. The material is applied with a 60 mm extruder operating at a melt temperature of 160–185 °C on a rotating screw line, often with a pressure die that forces the bedding compound into the cable interstices without over-compressing the core. The 28% vinyl acetate content permits the low-hardness compound to remain non-melting and dimensionally stable when exposed to the maximum operating temperature of the cable construction; the 3 g/10 min melt flow aids in the complete filling of small conductor gaps. Low residual catalyst reduces acetic acid release during processing, which lowers the risk of corrosion at the copper conductor if moisture is trapped in the bedding layer. Compliance is verified against NEK 606 for halogen-free marine cables, IEC 60092-359 for sheathing compounds for shipboard power and control cables, and IEC 60754-1/-2 for acid gas and acidity. Terminal products are halogen-free bedding layers used in shipboard cables, offshore platform cables, and floating production storage and offloading vessel cables, where the cable must maintain fire resistance under maritime conditions and avoid releasing halogens into enclosed compartments. The ratio of Ateva 2803W to EVA grades with higher or lower vinyl acetate must be adjusted to maintain the required tensile strength and elongation after ageing at 100 °C for 168 h, as specified by the relevant classification society.