The material sold as Clariant Thermoplastic Urethane White 3D Printer Filament is a white-pigmented thermoplastic polyurethane monofilament intended for fused filament fabrication. The product is identified by polymer class, white pigmentation, and filament geometry rather than by a widely published numeric resin grade. Distributor listings typically present the material in nominal diameters of 1.75 mm and 2.85 mm, with net spool weights of 0.5 kg or 1 kg; these dimensions should be verified against the current bill of lading and supplier lot documentation. The polyurethane matrix derives from segmented hard and soft blocks, which impart high elongation, low flexural modulus, and strong layer-to-layer fusion relative to rigid styrenic and polylactic acid feedstocks. White pigmentation is normally accomplished with dispersed titanium dioxide, which raises opacity and also modifies melt viscosity and nozzle wear behavior. Because a formal Clariant technical data sheet for this specific white thermoplastic urethane filament is not consistently available in public repositories, published data for this specific configuration is limited; the following sections therefore draw on standardized flexible-filament test protocols and typical industrial baseline values for similar white pigmented TPU monofilaments.

How Does Flexible Urethane Feedstock Compare With Rigid PLA and ABS in Fused Filament Fabrication?

The primary functional difference is tensile elongation at break. Rigid PLA and ABS typically exhibit elongations below 25 % when tested according to ASTM D638-14 or ISO 527-2:2012. Flexible thermoplastic urethane filament grades commonly range from 400 % to 700 % at 23 °C, depending on Shore hardness and soft-segment molecular weight. Tensile strength is inversely lower: TPU typically fall between 20 MPa and 40 MPa, whereas PLA is commonly reported at 50 MPa to 65 MPa and ABS at 35 MPa to 45 MPa. Hardness measured by ASTM D2240-05 places white TPU in the 85A to 95A range, while PLA and ABS are more appropriately measured on the Shore D or Rockwell scales. Interlayer adhesion in TPU is characteristically higher because the molten layer remains above the glass transition and soft segments permit chain interdiffusion; rigid PLA parts, by contrast, often fail along layer boundaries at elongations below 10 % in the Z axis. The thermal boundary conditions also differ: PLA softens above approximately 55 °C, ABS requires build-plate set points of 100 °C to 110 °C to control warpage, and flexible TPU is typically processed with a build-plate temperature of 40 °C to 60 °C.

The table is not a substitute for the Clariant certificate of analysis. It situates the white urethane product among standard filament classes rather than assigning exact lot-specific properties.

In direct-drive extrusion systems with a constrained filament path and a hardened steel nozzle, white pigmented TPU is typically printed at a nozzle set point between 220 °C and 250 °C, with build-plate temperatures from 40 °C to 60 °C. The use of a 0.4 mm nozzle and layer heights from 0.10 mm to 0.20 mm keeps volumetric throughput below the point at which hobbed drive gears begin to score or shear the filament. Linear print speeds of 15 mm/s to 40 mm/s are common; higher speeds are constrained by melt elasticity and the low column strength of flexible monofilament. Retraction distance is kept between 1.0 mm and 2.5 mm on direct-drive extruders, with retraction speed from 20 mm/s to 40 mm/s. On Bowden systems, retraction distances of 3 mm to 6 mm are sometimes reported, but the long flexible filament path increases the risk of buckling, dusting, and inconsistent extrusion pressure. Print heads operating at 70 °C to 90 °C can soften the filament if the material dwells against warm metal surfaces; cooled heat breaks and all-metal hot ends with boron nitride heat transfer compound are preferred. A geared direct-drive extruder with a 3:1 or higher reduction ratio reduces stepper-induced filament slip. Published data for this specific configuration is limited, but the processing envelope above reflects the general behavior of white pigmented TPU monofilaments on production-scale material extrusion machines.

When White Pigmented TPU is Processed Through Direct-Drive and Bowden Toolheads

Titanium dioxide pigmentation introduces an abrasive phase with Mohs hardness between 6 and 7. Unhardened brass nozzles exhibit measurable orifice enlargement after approximately 1 kg of white TPU throughput, particularly at temperatures above 230 °C. Hardened steel or ruby-tipped nozzles are therefore specified for sustained runs. The pigment also raises melt viscosity relative to natural TPU; if extrusion force becomes unstable, increasing the nozzle set point by 5 °C to 10 °C or reducing volumetric speed by 10 % to 20 % often restores consistent flow. On direct-drive toolheads, the dominant failure mode is filament buckling at the extruder drive roller rather than hot-end clogging; on Bowden machines, the dominant failure mode is filament compression inside the guide tube. Both failure modes are aggravated by excessive retraction, worn idler bearings, and badly cut filament ends. For white TPU, a flat-side or dual-drive extruder gear with 0.5 mm to 1.0 mm tooth engagement is preferred over aggressive tooth profiles that tear the surface. Because the white pigment can settle or agglomerate if melt residence time is excessive, purging with a natural TPU or polypropylene purge compound at the end of a run is advisable.

Predrying Thresholds Above 60 Percent Relative Humidity Are an Operational Boundary

Thermoplastic urethane is hygroscopic. When spooled monofilament is exposed to ambient air above 60 % relative humidity for more than 6 h, moisture uptake produces hydrolysis during extrusion, leading to brittle layers, surface splay, and reduced interlayer adhesion. Drying in a forced-air oven at 80 °C for 4 h to 6 h, or at 60 °C for 12 h using a dew point below -30 °C, is recommended before processing. Storage after drying should be in a sealed container with desiccant at 10 % RH or lower. Water absorption values for TPU filament are commonly measured by ISO 62:2008 in the range of 0.2 % to 0.5 % at 23 °C saturation; even these relatively small amounts affect melt viscosity and layer-tie strength. If a production run is interrupted for more than 30 min in an uncontrolled environment, the spool should be returned to the dryer. Moisture-induced printing defects are often misattributed to nozzle clogging; before disassembling the hot end, the operator should verify spool dew point and weigh a spool segment to record weight change against the supplier’s moisture specification.

Tear, Abrasion, and Compression Set Data Anchored to ASTM and ISO Test Methods

For flexible end-use parts such as seals, bellows, and protective covers, three mechanical parameters distinguish TPU from standard flexible TPE and rigid materials: tear strength, abrasion volume loss, and compression set. Typical unfilled thermoplastic urethane filament materials report tear strengths from 70 kN/m to 120 kN/m when tested according to ASTM D624 Die C. Abrasion volume loss measured by ISO 4649:2017 or DIN 53516:2008 is commonly in the range of 25 mm³ to 50 mm³. Compression set after 22 h at 23 °C under ASTM D395 Method B can range from 20 % to 50 %, and at 70 °C the value is typically higher. These ranges are material-class data, not batch-certified values for the Clariant product. Because white TiO₂ pigmentation can reduce elongation and tear strength by a few percentage points relative to unpigmented TPU, incoming inspection should include ASTM D624 Die C and ASTM D395 Method B if the printed part functions as a compressed gasket. Flexural modulus measured by ISO 178:2019 for TPU filament is generally between 20 MPa and 80 MPa, which is one to two orders of magnitude lower than unfilled PLA or ABS. This difference permits snap-fit designs without localized stress whitening at hinge points.

Before this white thermoplastic urethane filament is released into an electrical appliance or toy supply chain, the supplier’s most recent REACH declaration and European Union RoHS Directive 2011/65/EU certificate should be obtained. White pigments based on titanium dioxide normally do not contain cadmium, lead, or mercury above the concentrations restricted by RoHS, but the absence of a published Clariant certificate for this exact article prevents reliance on general industry assumptions. If food-contact use is proposed, the polymer must be evaluated against the relevant national migration limits; FDA 21 CFR 177.1680 may be referenced for certain polyurethane resins but does not automatically apply to a compounded pigmented filament. For skin-contact applications, the cured printed article should be tested for residual monomer and heavy metal migration under ISO 10993-5:2009 if biocompatibility is claimed. No conclusion about substantial equivalence should be inferred from this document.

For Flexible Urethane Print Jobs, Moisture Sensitivity and Elastic Recovery Determine Substitution Feasibility

Thermoplastic copolyester filament offers higher upper service temperature and better chemical resistance in some automotive oils, but its elastic recovery after cyclic strain is generally lower than TPU. Nylon blends provide higher tensile modulus and abrasion resistance but absorb moisture more rapidly; polyamide-12 can exceed 0.5 % water absorption under ISO 62:2008 and requires similar drying disciplines. TPU offers lower hardness without external plasticizer migration; this is significant where the part contacts polycarbonate or acrylic because external plasticizers can cause environmental stress cracking. In vibration isolation applications, TPU’s tan δ and hysteresis characteristics are more tunable than TPC; however, TPU has a narrower processing window at high shear rates and can lose mechanical properties if held above 250 °C for extended residence. White pigment additionally reduces visibility of surface defects but makes melt viscosity more sensitive to nozzle temperature fluctuations.

For white TPU production parts, the print chamber is often maintained at 30 °C to 40 °C to reduce warping while avoiding excessive softening. Garolite, polyetherimide, or sanded glass build plates with a polyvinyl alcohol-based adhesive provide acceptable adhesion without the excessive bond strength that can tear flexible parts during removal. A purge tower and minimal retraction are used in dual-material jobs where TPU is combined with a rigid support material; the white pigment can carry over into the support interface if purging time is below 10 s. Part cooling fans are set to 20 % to 50 % rather than full speed because rapid solidification of flexible layers increases interlayer anisotropy. Observed production bottlenecks include spool tangling from uneven winding, ovality above 0.05 mm causing under-extrusion, and filament softening in the extruder if chamber temperatures exceed 45 °C. Incoming inspection should record filament diameter at multiple angular positions with a calibrated micrometer and verify Shore A hardness, tear behavior, and moisture content before process commissioning. Published data for this specific configuration is limited; batch certification against tensile, tear, and moisture content should be requested from the supplier.