The product designated Versalis Impressio ABS C02 3D Printing Filament Grade ABS Polymer is an acrylonitrile-butadiene-styrene copolymer supplied for conversion into fused filament fabrication feedstock. The C02 suffix identifies a controlled-flow grade within the Impressio ABS series. According to lot-release data reported under ISO 1133-1:2022, the melt volume-flow rate at 220 °C and 10 kg load is typically held between 8 and 14 cm³/10 min; density measured under ISO 1183-1:2019 at 23 °C is 1.04–1.06 g/cm³. The product is available in natural and compounded colours, including masterbatch-matched formulations intended for 1.75 mm and 2.85 mm filament. On commercial filament extrusion lines, closed-loop diameter control is used with a target ovality below ±0.03 mm, supported by melt filtration through 60/80/100 mesh screen packs. This grade is not a high-heat ABS, an electroplating ABS, or an ASA; it is a medium-impact filament-grade ABS formulated to balance extrudate stability, interlayer adhesion, and dimensional stability.

The multiphase morphology of Versalis Impressio ABS C02 consists of butadiene rubber particles dispersed in a styrene-acrylonitrile matrix. The rubber phase provides crack-arrest capacity and low-temperature ductility, while the styrene-acrylonitrile phase contributes modulus, hardness, and chemical resistance. Differential scanning calorimetry under ISO 11357-2 typically places the styrene-acrylonitrile glass transition near 100–105 °C. This transition temperature is relevant to layer bonding in additive manufacturing because chain diffusion across a deposited bead interface requires local mobility above the glass transition of the matrix phase. The material is therefore processed in a chamber that keeps the previously deposited surface sufficiently hot, while avoiding gross flow or sag of the printed geometry.

Which Drying and Melt-Filtration Conditions Stabilise Filament Diameter?

Before conversion, residual moisture must be reduced below 0.02 wt% because moisture in the melt creates surface splay, micro-voids, and diameter variability in the final filament. The recommended drying condition is 80 °C for 3–4 h in a desiccant dryer with a dew point of -40 °C or lower. In high-humidity environments above 60% RH, storage in moisture-barrier bags is required after drying because open hoppers allow gradual moisture uptake. On single-screw extruders with an L/D ratio of 25:1 to 30:1 and a compression ratio of 2.5:1 to 3.0:1, barrel temperatures are profiled from 170 °C at the feed throat to 210 °C in the metering zone and 220 °C at the die. Melt temperature should remain below 250 °C; above this threshold the butadiene-grafted styrene-acrylonitrile phase degrades, leading to yellowing, reduced impact strength, and gel formation. Batch-to-batch melt volume-flow variation observed on twin-screw compounding lines is normally held within ±1.5 cm³/10 min to maintain consistent filament diameter and melt pressure. A gear pump or high-accuracy melt pump can reduce surging when filament tolerance is specified below ±0.02 mm.

Melt rheology under capillary conditions is shear-thinning. Typical apparent shear viscosity at 230 °C decreases from approximately 1.0 ×10³ Pa·s at 100 s⁻¹ to 1.2 ×10² Pa·s at 1000 s⁻¹ when measured by capillary rheometry in accordance with ISO 11443. This behaviour permits flow through a 0.4 mm nozzle while retaining sufficient melt strength to limit strand sag. If diameter variance exceeds ±0.05 mm at a haul-off speed of 60 m/min, filament producers normally adjust haul-off tension or melt temperature rather than raising melt temperature further, because higher temperature reduces viscosity but accelerates butadiene degradation.

On heated-chamber fused filament fabrication machines, a nozzle set point of 230–250 °C and a heated bed of 95–110 °C are used with a 0.4 mm brass or hardened steel nozzle. The chamber temperature is normally maintained at 50–70 °C to reduce corner lifting. Part-cooling fans are disabled or limited to 20% maximum because anisotropic shrinkage can detach the first layer. Adhesion is typically established on polyimide tape, ABS slurry, or polycarbonate build surfaces; nylon-based build surfaces may be insufficient above 60 °C chamber temperature. Linear moulding shrinkage, measured on injection-moulded plaques under ISO 294-4:2018, is approximately 0.4–0.7%. When printing with a 0.4 mm nozzle, volumetric flow rates above 12 mm³/s may produce under-extrusion unless the hot-end geometry supports higher melt throughput. Interlayer tensile strength in the build direction is typically 60–80% of xy-direction tensile yield when measured on printed ISO 527-2 type 1B specimens; the actual value depends on chamber temperature, extrusion width, and layer time. Parts longer than approximately 150 mm in the longest axis often require active chamber heating and controlled cool-down after printing; uncontrolled cooling produces corner lift exceeding 0.2 mm.

Mechanical Property Bands Obtained Under ISO 527-2, ISO 178, and ISO 180/A

On filament-extruded and injection-moulded specimens, the tensile modulus measured under ISO 527-2:2012 at 23 °C is typically 1900–2300 MPa. Yield stress ranges from 34 to 40 MPa, with yield strain between 2.4% and 3.0%. Elongation at break is grade-dependent but commonly falls between 10% and 30% at 23 °C. Flexural modulus under ISO 178:2019 is approximately 1900–2200 MPa, and flexural strength at 3.5% strain is 55–65 MPa. Notched Izod impact under ISO 180/A at 23 °C is typically 18–25 kJ/m²; at -20 °C, quoted values often decline to 8–12 kJ/m². Rockwell hardness under ISO 2039-2 is typically 105–112 on the R scale. These values are obtained on solid test specimens and are not direct guarantees for printed parts because layer interfaces and void population can reduce tensile and impact performance depending on print direction.

Thermal performance differentiates this ABS from PLA. Vicat softening temperature B50 under ISO 306:2022 is typically 94–98 °C. Heat deflection temperature under ISO 75-2:2013 is approximately 88–92 °C at 1.80 MPa and 96–100 °C at 0.45 MPa. The coefficient of linear thermal expansion is about 80–110 ×10⁻⁶ K⁻¹ between 23 °C and 80 °C. Continuous use in air without load is generally limited to 70–80 °C for dimensionally stable parts; above this range, modulus decays and creep accelerates. Annealing printed ABS at 80 °C for 1–2 h can reduce residual stress, but uncontrolled annealing of thin-wall parts can produce warpage. For service above 85 °C, a high-heat ABS or polycarbonate filament should be evaluated rather than this grade.

When Outdoor Durability and Low Moisture Sensitivity Are Prioritised Over Heat Resistance

Compared with PLA, Impressio ABS C02 offers higher HDT and ductile impact but higher warpage and greater odour during printing; PLA is preferred on non-enclosed machines with unheated beds. Compared with ASA, the ABS grade has lower ultraviolet resistance and tends to yellow more rapidly under ISO 4892-2:2013 xenon-arc exposure; ASA is selected when colour stability and outdoor weatherability are required. Compared with standard injection-moulding ABS, the filament-grade formulation has a narrower melt flow band and tighter gel control to stabilise extrudate diameter; it is not optimised for thin-wall injection moulding, electroplating, or high-gloss Class A surfaces. Compared with high-impact ABS, the C02 grade balances melt strength and layer adhesion rather than maximising notched impact at low temperature. Compared with PETG, ABS C02 offers higher heat deflection but greater warpage and higher solvent sensitivity; PETG is often selected for lower warpage and improved resistance to many dilute acids and alkalis, though PETG has lower HDT. Published data for this specific configuration is limited for long-term outdoor UV performance; outdoor service should not be specified without part-level xenon-arc or QUV testing.

The following comparison is compiled from public datasheet value ranges for filament-grade polymers; it is not a lot-specific certificate and should not be used for final part qualification without actual moulded or printed specimens.

Regulatory Documentation and Lot-Traceability Requirements

Compliance status must be verified on each lot certificate because colour concentrates and process aids can alter regulatory status. Under RoHS Directive 2011/65/EU Annex II, restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE should be confirmed by supplier declaration. REACH Regulation EC No 1907/2006 SVHC content should be stated on request. The material is not automatically compliant with food-contact standards; if direct food contact is required, lot-specific compliance to FDA 21 CFR 177.1020 or EU 10/2011 must be explicitly provided. Production traceability under ISO 9001 normally covers raw monomer, rubber phase, additives, and finished pellet lot, which supports PPAP-like qualification in automotive and appliance applications. Lot release for this grade typically includes melt volume-flow rate, tensile yield, flexural modulus, notched Izod impact, Vicat softening temperature, and colour coordinates. Certificates should report actual measured values against the specification band rather than nominal values only.

The chemical resistance of Impressio ABS C02 is typical of ABS. Concentrated oxidising acids, aromatic hydrocarbons, ketones, esters, and chlorinated solvents attack the polymer. Acetone exposure is used deliberately for solvent smoothing; however, prolonged immersion causes stress cracking, swelling, and loss of dimensional tolerance. Isopropyl alcohol is generally acceptable for cleaning, but wetted contact should be kept short because absorbed solvent can plasticise the surface and reduce layer adhesion. The material is not formulated as an antistatic compound; if static dissipation is required, volume and surface resistivity must be verified under IEC 62631-3-1. If ignition-resistant performance is required, a flame-retardant grade must be specified and tested under UL 94 because unfilled ABS is not inherently ignition-resistant.

Post-print finishing commonly includes sanding, filling, priming, and solvent smoothing. When acetone vapour smoothing is used, chamber temperature is typically maintained at 45–55 °C for 10–20 min; longer exposure collapses fine features and reduces fracture resistance. Painting systems should be screened for solvent attack on the ABS surface, and paint adhesion should be verified by cross-cut testing under ISO 2409 before production runs. Functional applications using this grade include assembly jigs, interior trim brackets, enclosures, and low-volume tooling templates where moderate heat resistance and post-machining are required.