The Clariant Polycarbonate + ABS White 3D Printer Filament is a compounded fused filament fabrication feedstock produced from an unfilled polycarbonate and acrylonitrile-butadiene-styrene blend containing a white pigment package. The material is supplied in nominal filament diameters of 1.75 mm or 2.85 mm, with commercial lot tolerances typically referenced at ±0.05 mm diameter and ovality below 0.03 mm; final conformance should be confirmed against the lot-specific certificate of analysis because regional product designations and spool formats may vary. The polycarbonate-rich phase increases heat deflection temperature and tensile modulus relative to unfilled ABS, while the ABS phase improves melt processability, lowers moisture sensitivity, and reduces the notch sensitivity associated with unfilled polycarbonate. The product is specified for functional prototypes, short-run tooling fixtures, and heated-tool aids where dimensional stability under moderate thermal load is required. Published mechanical data for this specific white Clariant filament configuration is limited, and design values should be derived from printed specimens rather than injection-moulded polycarbonate/ABS datasheets.

Before extrusion, controlled drying is mandatory for this class of moisture-sensitive PC/ABS feedstock. A desiccant dryer with supply-air dew point at or below -40 °C and a bed temperature of 80 °C to 90 °C for 4 h to 6 h reduces residual moisture to below 0.02 wt% when measured by Karl Fischer coulometric titration per ISO 15512:2019. On production-scale fused filament fabrication lines, failure to maintain closed-loop dry-air conveying at relative humidity below 10% has been observed to produce interlayer splitting and rough extrudate surfaces, because steam generated at the nozzle generates micro-voids at the polymer-polymer interface. The white titanium dioxide pigment can increase melt viscosity and is best dispersed during compounding on a co-rotating twin-screw extruder with an L/D ratio of 36:1 to 48:1 and barrel temperatures between 240 °C and 275 °C. Inadequate pigment dispersion is more likely to appear as surface streaking than as bulk mechanical failure.

What Distinguishes the White PC+ABS Filament From Unfilled ABS and Polycarbonate Monofilaments?

At the feedstock level, white polycarbonate/ABS occupies an intermediate position between unfilled ABS and neat polycarbonate. Melt volume-flow rate measured at 260 °C with a 5.0 kg piston load per ISO 1133-1:2022 is commonly reported between 8 cm³/10 min and 18 cm³/10 min. Printed tensile specimens tested in the XY plane according to ASTM D638-14 Type IV at a crosshead speed of 5 mm/min typically produce tensile strength between 41 MPa and 52 MPa, tensile modulus between 2.1 GPa and 2.6 GPa, and elongation at break between 5% and 15%. The unfilled ABS comparison is generally lower in heat resistance and modulus, while neat polycarbonate filament can exceed 60 MPa tensile strength but often exhibits higher warpage and greater moisture sensitivity during printing.

Because fused filament fabrication creates a weakly bonded layer-normal direction, the mechanical response of the white PC+ABS grade is not isotropic. Z-direction tensile strength is commonly 30% to 50% lower than XY tensile strength, and the reduction is greatest when the chamber is unheated and interlayer temperature falls below the glass transition region. A build plate temperature of 100 °C to 110 °C and a chamber air temperature of 70 °C to 85 °C maintain interlayer diffusion and reduce edge lift. This distinguishes the blend from unfilled ABS, which can often be printed in an open-chamber desktop machine with a 90 °C bed, and from neat polycarbonate, which requires aggressive chamber heating and thermal shielding to control warp and delamination.

When White PC+ABS Is Substituted for Unfilled ABS in Heated-Tool Functional Prototypes

For tooling fixtures exposed to local contact temperatures of 80 °C to 95 °C, the white PC+ABS blend maintains dimensional stability more reliably than unfilled ABS. Heat deflection temperature measured under 1.8 MPa flexural stress per ISO 75-2/A is typically 96 °C to 108 °C, compared with 80 °C to 95 °C for many FFF ABS grades. This difference enables temporary use in guarded low-pressure injection tooling or thermoforming aids when surface temperature remains below the Vicat softening temperature of 115 °C to 125 °C measured per ISO 306/B50. The substitution is not appropriate for continuous service above 90 °C under sustained mechanical load because creep in the ABS phase becomes measurable, and ISO 899-1 creep performance remains below that of glass-filled polycarbonate or engineering thermoplastics. Chemical resistance follows the unfilled PC/ABS pattern: diluted acids and aliphatic hydrocarbons are tolerated under short-term immersion, while ketones, esters, chlorinated solvents, and concentrated alkaline media cause stress cracking or surface attack.

Process-induced failure in white PC+ABS deposition is dominated by two interacting variables: melt residence time and part-cooling rate. The recommended extrusion temperature window is 260 °C to 280 °C, with the lower bound set by pressure drop at the nozzle and the upper bound set by thermal degradation of the ABS phase. At melt temperatures above 290 °C, gloss reduction and discoloration may appear after 5 min to 10 min of static residence time in a hot end. A hardened steel or stainless-steel nozzle with a bore diameter of 0.4 mm to 0.6 mm and a direct-drive extruder with an isolated feed zone are used to control oozing and maintain consistent filament feeding. Retraction distances of 0.8 mm to 1.5 mm at 20 mm/s to 30 mm/s reduce stringing without generating excessive drive-gear wear; Bowden arrangements require longer retraction and are more prone to hysteresis. Layer heights between 0.10 mm and 0.25 mm with extrusion widths of 0.40 mm to 0.60 mm are common, but interlayer strength improves when the layer height does not exceed 60% of the nozzle diameter.

Thermal History, Residual Stress, and White Pigment Effects on Printed Part Dimensions

The white pigment, typically rutile titanium dioxide at an addition of 1 wt% to 4 wt%, increases melt viscosity and can narrow the process window for large flat plates. In FFF deposition, the inorganic pigment phase raises the solidification front slightly, while residual stress develops as each deposited layer cools and contracts; without a chamber air temperature of 70 °C to 85 °C, corner lift can exceed 0.2 mm on parts with a footprint above 150 mm × 150 mm. The anisotropic contraction is reduced by printing with a 10 mm to 20 mm brim or a raft and by avoiding sharp corner radii below 5 mm. Dimensional checks after annealing at 80 °C for 2 h per ISO 294-4 may show shrinkage of 0.3% to 0.5% in the XY plane and up to 1.0% in the Z direction, and tool paths should be scaled accordingly for dimensionally constrained parts.

Compared with glass-fiber-reinforced polycarbonate filament, the unfilled white PC+ABS grade has lower tensile modulus and lower heat deflection temperature but substantially reduced abrasive wear on brass and aluminum nozzles because short glass fiber is absent. The tensile modulus of 2.1 GPa to 2.6 GPa compares with 5 GPa to 7 GPa for printed glass-filled polycarbonate tested under equivalent ASTM D638-14 conditions. The unfilled blend is also less notch-sensitive and easier to post-machine than highly filled PC, although it does not provide the dimensional flatness and thermal expansion control available from glass-filled grades. Against black-pigmented PC+ABS filament, the white variant is selected for optical reflectivity and visual inspection contrast, but it can show layer-line artefacts more readily than carbon-black-filled grades.

Regulatory Parameters That Govern Use in Enclosed Printing Cells

Regulatory classification for the Clariant Polycarbonate + ABS White 3D Printer Filament must be confirmed against the current safety data sheet, but the base PC/ABS chemistry is not typically classified as a hazardous mixture for transport. Under Directive 2011/65/EU and its delegated acts, the compound is expected to fall below the maximum concentration values for lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers; however, the white pigment and processing aids require lot-specific verification. The product is not positioned as a flame-retardant grade, and unfilled PC/ABS is generally classified at or below HB under UL 94 testing at 1.5 mm thickness.

During FFF extrusion at the recommended melt temperature, total volatile organic compound and ultrafine particle emission rates are influenced by the ABS phase, and local exhaust ventilation with a capture velocity of at least 0.5 m/s is recommended in enclosed printing cells. The product should not be exposed to open flame or to printing temperatures above 290 °C, because thermal decomposition products may include styrene, acrylonitrile, and bisphenol-A-derived compounds. Published emission data for this specific white filament configuration is limited; industrial hygiene monitoring per ISO 16000-6 during multi-machine production campaigns is therefore the appropriate verification route. The white colourant differentiates the material from natural and black PC+ABS grades in optical performance: visible-spectrum reflectance above 85% across 400 nm to 700 nm can be achieved on clean top surfaces, but gloss differences and layer-line scattering reduce perceived whiteness on sidewalls. Thin walls below 1.0 mm may retain some through-thickness translucency, which is a separate design constraint from mechanical strength and is not present to the same degree in carbon-black-filled polycarbonate/ABS filament.