| HS Code | 669855 |
| Product Name | Mitsubishi PP 3D Printing Filament |
| Manufacturer | Mitsubishi Chemical |
| Material | Polypropylene (PP) |
| Filament Diameter | 1.75 mm |
| Diameter Tolerance | ±0.05 mm |
| Net Weight | 1 kg |
| Spool Diameter | 200 mm |
| Spool Width | 67 mm |
| Spool Hub Diameter | 53 mm |
| Density | 0.90 g/cm³ |
| Melt Flow Rate | 8 g/10 min |
| Melting Point | 160 °C |
| Nozzle Temperature | 220-240 °C |
| Bed Temperature | 90-110 °C |
| Print Speed | 30-60 mm/s |
| Cooling Fan Speed | 0-25% |
| Tensile Strength | 25-30 MPa |
| Elongation At Break | >300% |
| Flexural Modulus | 1000-1200 MPa |
| Water Absorption | <0.02% |
| Chemical Resistance | Good against acids, bases, and solvents |
| Food Contact | Generally food-safe depending on formulation |
| Uv Resistance | Poor |
| Color | Natural |
| Storage | Dry, cool place |
As an accredited Mitsubishi PP 3D Printing Filament factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Sealed 1 kg spool in vacuum foil bag, labeled Mitsubishi PP 3D Printing Filament, with desiccant and cardboard box. |
| Container Loading (20′ FCL) | 20′ FCL loading: Mitsubishi PP 3D printing filament, palletized in dry container, ambient and moisture-controlled, properly secured for ocean transport. |
| Shipping | Mitsubishi PP 3D Printing Filament ships as a non-hazardous solid in sealed spools and boxes. Store and transport at ambient temperature, away from moisture, direct sunlight, and heat. No special dangerous goods classification is required. Handle with care to prevent spool damage and filament contamination. Keep packages dry and intact. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and strong oxidizers. Keep sealed in original packaging or an airtight container with desiccant to prevent moisture absorption. Reseal after use and avoid prolonged humid air exposure. Protect from dust, physical damage, and ignition sources. Maintain stable room temperature; do not store near acids, bases, or solvents. |
| Shelf Life | Mitsubishi PP 3D Printing Filament: approximately 12–24 months if kept sealed, dry, and protected from UV light for optimal performance. |
Chemical labware and fluid-contact fixtures represent a direct application for Mitsubishi PP 3D Printing Filament because the olefinic backbone resists dilute acids, aqueous bases, and polar alcohol mixtures that attack PETG and ABS. The printed wall must be consolidated sufficiently to prevent interlayer capillary leakage. Consolidation is achieved by holding the nozzle at the upper end of the polypropylene melting range, 230–240 °C, and by limiting layer height to 0.20 mm with a 0.40 mm nozzle. Lower nozzle temperatures produce a melt with higher elongational viscosity. The deposited strand cools before it diffuses into the previous layer, leaving elongated voids along the z-axis. These voids are the primary leak path in printed fluid-contact parts. Build-platform adhesion uses cast PP sheet or PP film tape rather than polyimide, PEI, or cyanoacrylate surfaces, because the low surface energy of polypropylene prevents polar adhesives from wetting the substrate. A heated bed at 85–100 °C and a still air shield maintaining local temperature above 35 °C are required to slow crystallisation shrinkage. Corner lift and warpage are controlled by a continuous skirt or brim with a contact distance of 5–10 mm. For food-contact parts, the raw polymer must be evaluated under FDA 21 CFR 177.1520 and EU Regulation (EU) 10/2011, with overall migration tested by EN 1186-1. The applicable limit for general food simulants is 10 mg/dm². For laboratory components that do not enter the mouth, chemical resistance to aggressive acids is confirmed by immersion testing, but prolonged exposure to acetone, methyl ethyl ketone, toluene, or chlorinated hydrocarbons causes swelling and is outside the operational boundary. Printed parts should be annealed at 110–120 °C for 1–2 h to relax orientational stresses and reduce interlayer notch sensitivity. Terminal products include acid-resistant dip trays, pump inlet manifolds, wash bottle fittings, and custom bleed ports for aqueous processing lines. Published data for this specific filament configuration under constant hydrostatic pressure is limited. Any load-bearing fluid boundary should be qualified with a water immersion and differential pressure test before production release.
Thin-wall PP fluid reservoirs fail during printing when the extrudate exits the nozzle under excessive wall shear stress and the outer surface tears before the strand is laid onto the substrate. The condition is aggravated by the narrow molecular weight distribution of common polypropylene filament grades and by a rapid transition from shear thinning to plug flow in a 0.40 mm nozzle. Melt fracture is controlled by holding the nozzle temperature at 230–240 °C, reducing print speed to 15–25 mm/s, and maintaining a wall thickness of at least 1.2 mm for open-section prototypes. The extrusion flow path inside the hot end must not include abrupt diameter reductions greater than the 2:1 taper angle typical of hardened steel nozzles. A worn or oxidised brass nozzle with internal roughness increases the coefficient of friction at the die wall and triggers sharkskin at lower throughputs. Build chamber air temperature should be kept between 45 °C and 60 °C because the semi-crystalline solidification front advances rapidly below that window. A heated bed at 90–100 °C alone is not sufficient to suppress differential shrinkage through tall walls. The part should be printed with solid perimeters and an infill density of 100 % when the reservoir must hold coolant or wash fluid. Less than solid infill leaves internal cavities that concentrate stress under thermal cycling. Terminal products from this segment include prototype washer bottles, coolant overflow tanks, HVAC drain pans, and low-pressure reservoirs used in pre-production vehicle validation. Compliance testing for automotive fluid handling is governed by OEM-specific coolant ageing and heat-shock protocols rather than a single ISO standard, although tensile properties of the feedstock should be verified according to ISO 527-2 and flexural modulus according to ISO 178. A boundary condition is imposed by polypropylene oxidative resistance. Continuous exposure to hot coolant above 80 °C without heat-stabilised additive packages embrittles the printed shell over time. Users should review oxidative induction time according to ASTM D3895 for production-representative material. Published data for this specific filament in long-term coolant immersion is limited. Validation must be performed with the final printed wall thickness and annealing condition before any functional use.
Mitsubishi PP 3D Printing Filament is evaluated for automotive HVAC ducting and cable harness clip prototyping where density, vibration damping, and resistance to mild acidic condensate are required. The base density of unfilled PP is 0.89–0.91 g/cm³ per ISO 1183-1, which permits lightweight duct adapters compared to ABS or PC-ABS. HVAC air ducts printed from this material are typically produced with a layer height of 0.15 mm, a perimeter count of 4–5, and an infill density of 20–40 % for non-structural duct runs. Cooling fan speed during printing should be set to 0–10 %. Higher fan settings crystallise the PP surface too quickly and create a weak boundary between the skin and the next deposited layer. Cable clips in the underbonnet environment require solid infill of 100 % and a print orientation that places the clip flexure plane parallel to the build plate, because z-axis interlayer weakness limits latch arm retention. The part must be printed with the layer lines running along the clip beam rather than transversally across it. Transverse interfaces fail in fastening engagement. Continuous use under underbonnet temperatures above 90–95 °C is not recommended for unfilled PP without automotive heat-stabilised compounding. The heat deflection temperature of typical unfilled PP is in the range 90–110 °C at 0.45 MPa under ISO 75-2, but this value is not a continuous service temperature. Candidate parts must be checked for volatile condensate resistance by exposure testing to weakly acidic media representative of HVAC condensate. Terminal applications include cabin air duct adapters, defrost nozzle prototypes, cable harness clips, sensor brackets, and ancillary fluid tube clips. Environmental compliance for production-intent automotive parts follows EU 2000/53/EC end-of-life vehicle requirements, REACH SVHC candidate list screening, and EU 2011/65/EU RoHS restrictions. The raw polypropylene used in the filament must have a documented absence of restricted phthalates, heavy metals, and brominated flame retardants. Users should verify the manufacturer’s statement for the exact batch before quoting supply to an OEM.
In reusable steam-sterilised fixtures and non-fluid-contact device housings, Mitsubishi PP 3D Printing Filament is applied because polypropylene can withstand autoclave conditions provided the part is unstressed and wall thickness is uniform. The target sterilisation cycle is steam at 121 ± 1 °C for 15 min according to ISO 17665-1. Printed polypropylene parts must be annealed before the first autoclave exposure to prevent dimensional recovery and edge lift during repeated cycles. The recommended annealing step is 120 °C for 1–2 h in a convection oven with the part fixtured. Uncontrolled annealing allows thin walls to shrink differentially. The printed part must be produced with a layer height of 0.15 mm, a perimeter count of 4, and a solid top/bottom layer count of 5 to delay steam penetration into internal voids. The use of cooling fan air during printing is set to off or below 5 %. Interlayer adhesion is the governing variable for autoclave survival, not surface finish. Biocompatibility for patient-contact use is not automatically inherited from the base resin. The raw material should be validated to ISO 10993-5 for cytotoxicity and, where applicable, USP Class VI. The final printed and sterilised device must undergo biological evaluation according to ISO 10993-1 as a finished configuration. Terminal parts are instrument handles, quick-release locking calipers, pH probe holders, pipette racks, and trays for cleanroom transfer. The operational boundary is load during steam exposure. Parts under sustained clamp pressure or asymmetric metal inserts deform above 100 °C because PP modulus drops steeply near the crystallite melting point. Published data for repeated autoclave cycles on this filament is limited. Users should log dimensional drift across at least 20 sterilisation cycles before releasing reusable fixtures in a production environment.
Low-voltage electrical housings printed from unfilled PP are evaluated for dielectric performance, not for full flame-retardant enclosure approval. Unfilled polypropylene exhibits a volume resistivity typically above 1016 Ω·m under IEC 62631-3-1 and dielectric strength in the range 20–30 kV/mm under IEC 60243-1, but these values are measured on void-free injection-moulded plaque specimens. FFF interlayer voids reduce dielectric strength perpendicular to the build plane. The rear-side wall of a printed housing should therefore have a wall thickness of at least 2.0 mm and a perimeter count of 5–6, with the potential-bearing surface printed flat to keep layer boundaries parallel to the creepage path. Base polypropylene is classified as UL 94 HB. A housing that must pass UL 94 V-2 or V-0 is outside the capability of neat PP filament unless the filament grade is specifically compounded with a halogen-free intumescent flame-retardant system. Additive-loaded FR PP grades increase nozzle abrasion and may reduce layer bonding. A hardened steel nozzle of 0.40 mm or larger is required. The use of an external flame-retardant coating applied after printing does not alter the substrate flammability classification under UL 94. Terminal products in this segment are control box prototypes, sensor enclosures, junction box covers, and connector covers for dry indoor instrumentation. Compliance with low-voltage safety standards such as IEC 60950-1 or its successor IEC 62368-1 requires end-product testing under the actual enclosure configuration and wall thickness, not raw material data. RoHS compliance is evaluated under EU 2011/65/EU Annex II restricted substances, and REACH SVHC screening under EC 1907/2006. Published data for 3D printed unfilled PP as a standalone electrical enclosure is limited. Dielectric type tests on printed coupons are mandatory if the housing is used in a mains-connected assembly.
For any living-hinge prototype intended to match injection-moulded polypropylene, the thin flexural zone must be printed with the extrusion path parallel to the hinge axis. Living hinges are one of the most demanding functional applications for polypropylene because polymer chain alignment in a thin flexural zone determines cycle life. In injection moulding, the melt is oriented through a thin gate into the hinge line. In FFF, the process must be adapted to orient printed strands along the hinge axis. The hinge should be modelled with a thickness of 0.4–0.6 mm and printed with a solid line fill, with the extrusion path parallel to the hinge axis for every layer. A nozzle temperature of 230–240 °C and a layer height of 0.10–0.12 mm are used to reduce the size of interlayer notches in the flexural zone. The build plate is kept at 90–100 °C and the cooling fan is disabled. Forced convection cooling freezes the top surface of the thin hinge before the next pass and creates a weak plane. After printing, the hinge is flexed only after stress-relief annealing at 110–120 °C for 30–60 min. The first flex cycles should be run slowly to orient polymer chains in tension. Post-annealing static molecular ordering is not sufficient. Terminal products include access panel lids, snap-fit enclosures with integrated hinges, cable tie prototypes, and collapsible packaging fixtures. Tensile properties are verified according to ISO 527-2 on printed coupons oriented in the XY plane. Flexural stiffness is measured according to ISO 178. A direct comparison to injection-moulded PP living hinges must account for the fact that FFF parts have interlayer fusion boundaries and surface grooves. The resulting strain concentration reduces hinge cycle life relative to injection-moulded equivalents. Published data for the fatigue life of FFF PP living hinges is limited. Cycle testing on production-representative parts is required before design freeze.
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Mitsubishi PP 3D Printing Filament is an unfilled polyolefin monofilament produced for fused filament fabrication. The product line is positioned among Mitsubishi Chemical’s polyolefin materials; exact grade code, colorant loading, spool size, and diameter tolerance are specified on product-specific batch documentation. Common filament diameters offered in industrial FFF are 1.75 mm and 2.85 mm, with roundness tolerances generally controlled within ±0.05 mm to prevent bore-flow instability. The material’s low density of 0.89–0.91 g/cm³ by ISO 1183-1 is lower than PLA, ABS, and PETG, which directly reduces mass in large-format printed parts. Its semi-crystalline melting peak, typically 160–170 °C for a homopolymer by ISO 11357-3, sets a nozzle-processing window above 210 °C and below thermal-degradation thresholds near 270 °C.
In unfilled FFF-grade PP, a melt flow rate of 2–10 g/10 min at 230 °C/2.16 kg by ISO 1133-1:2022 balances hot-end flow with layer stability. The material is not a direct drop-in replacement for PLA; it requires a higher build-plate temperature and a matched polyolefin adhesion surface. The table below summarizes the representative property envelope for unfilled FFF-grade PP. It is not a certified Mitsubishi datasheet but a technical reference window based on published polypropylene FFF feedstock characteristics.
| Property | Representative Unfilled FFF-Grade PP Range | Test Method |
|---|---|---|
| Density | 0.89–0.91 g/cm³ | ISO 1183-1 |
| Melt flow rate | 2–10 g/10 min at 230 °C/2.16 kg | ISO 1133-1:2022 |
| Tensile stress at yield | 25–35 MPa | ISO 527-2 at 50 mm/min |
| Tensile modulus | 1,100–1,500 MPa | ISO 527-2 at 1 mm/min |
| Flexural modulus | 1,000–1,600 MPa | ISO 178 |
| Nominal tensile strain at break | 20–600% | ISO 527-2 |
| Melting peak | 160–170 °C | ISO 11357-3 |
| HDT at 0.45 MPa | 85–105 °C | ISO 75-2/B |
| Moisture absorption | 0.1% maximum at 23 °C/50% RH | ISO 62 |
Unlike amorphous ABS or PETG, PP solidifies through nucleation and spherulitic crystal growth. The density rise from the melt to the semi-crystalline solid causes volumetric contraction. In injection molding, unfilled PP linear mold shrinkage typically falls between 1.0% and 2.5% when measured under ISO 294-4; in fused filament fabrication, that contraction is directionally constrained by raster orientation, perimeter fusion, and the build platform. The resulting residual stress can lift a part edge from the print bed if the bed interface cannot sustain the contractile force.
Polypropylene has a low equilibrium surface energy of 29–31 mN/m. On high-energy surfaces such as bare glass, anodized aluminum, or untreated PEI, the melt can wet initially but the solid interface remains weak because adhesion is primarily mechanical. A polypropylene build plate, PP tape, or a two-part polyolefin primer is typically required. Bed temperatures in the range of 80–110 °C reduce the local thermal gradient, but they are seldom sufficient on large flat parts. Part-cooling fans should remain off during the first 10–15 layers, and the first-layer speed should be reduced to 20–40 mm/s to maximize contact-area development.
Thermal expansion also contributes to stress during cooling. Unfilled PP typically exhibits a coefficient of linear thermal expansion in the range of 80–150×10⁻⁶ K⁻¹ by ISO 11359-2. This is higher than glass, aluminum, and most filled build-platform materials, so differential contraction between the lowest printed layer and the bed can initiate delamination. Reducing bed temperature after the first few layers is therefore not a simple cure; it lowers adhesion enthalpy precisely when the upper layers begin to accumulate thermal strain.
Footprint geometry amplifies the defect. Long continuous rasters along a rectangular part periphery create axial tensile stress, while a segmented or circular footprint distributes contraction. If lift persists, the operator should lower nozzle temperature within the melt window, reduce infill density to limit internal contraction, or subdivide the part to reduce continuous-filament length. These measures are process-oriented; they do not compensate for an unsuitable bed surface.
On a production extrusion line, a low-MFR PP compound for FFF filament is commonly prepared on a co-rotating twin-screw extruder with an L/D ratio near 40:1. Gravimetric feeding, melt filtration, gear-pump metering, and closed-loop diameter gauging are used because small diameter excursions in PP propagate into visible under- or over-extrusion. If the MFR is too high, the hot end may exhibit melt backflow and inconsistent filament diameter; if too low, feed resistance increases and the extruder stepper may skip on a direct-drive or Bowden system. The practical nozzle-temperature profile must therefore be derived from the manufacturer’s MFR value, not from PLA or PETG presets.
PP is not hygroscopic in the manner of nylon or PETG. Moisture absorption is below 0.1% at 23 °C/50% RH by ISO 62, so hydrolytic drying is usually unnecessary. Surface condensation may appear when a cold spool is moved into a humid print room; in that case pre-drying at 60–70 °C for 2–4 h in a forced-air dryer removes adhered moisture. Thermal oxidative degradation of PP is a more relevant boundary: idle residence in the hot end above 250 °C can drive chain scission, reduce viscosity, and cause embrittled weld lines.
Interlayer strength in PP is established by molecular interdiffusion across the molten road interface. The available diffusion time is limited by the crystallization onset, which is influenced by cooling rate and by the melt temperature. If the interval between successive passes is long enough for the previous road to form a crystalline skin, the next layer cannot entangle with the surface, and the result is a weak weld. This mechanism is visible in axial tensile bars that fail in the Z direction at values far below the material’s bulk yield stress.
Large single-perimeter hollow shells and thin-wall tubes are especially sensitive because the distance between passes can exceed the time needed for the surface to cool through the crystallization onset. To maintain weld strength, layer time can be reduced by increasing print speed, reducing layer height, or using a hotter nozzle. Conversely, if the print speed is raised beyond the hot end’s melt-delivery capacity, the road width falls and the contact area at the weld is reduced. Published data for this specific Mitsubishi PP printed configuration are limited; operators should validate with tensile specimens cut transverse to the layer plane using ISO 527-2 and compare values against the filament’s in-plane yield stress.
Numerical heat-transfer calculations for PP FFF show that the top surface temperature decays at a rate dependent on layer height and part thermal diffusivity. Thick layers store more heat per pass but also produce longer cooling times before the next pass, so the process optimum is not always the maximum layer height. A layer height between 0.15 mm and 0.25 mm often balances thermal mass and interlayer contact for unfilled PP, but machine tests are required. High chamber temperatures can extend the open diffusion time, but if the chamber is above the crystallization onset, part geometry may distort under self-weight.
The following comparison places PP among common unfilled FFF feedstocks.
| Attribute | PP | PLA | ABS | PETG |
|---|---|---|---|---|
| Density | 0.89–0.91 g/cm³ | 1.24–1.26 g/cm³ | 1.03–1.07 g/cm³ | 1.27 g/cm³ |
| Tensile modulus | 1,100–1,500 MPa | 3,000–3,600 MPa | 1,800–2,600 MPa | 1,900–2,300 MPa |
| HDT at 0.45 MPa | 85–105 °C | 50–60 °C | 85–100 °C | 65–75 °C |
| Moisture uptake at 23 °C/50% RH | 0.1% maximum | 0.2–0.4% | 0.3–0.8% | 0.2–0.5% |
| Typical heated-bed setpoint | 80–110 °C | 20–60 °C | 90–110 °C | 60–80 °C |
| Nozzle processing range | 220–250 °C | 190–220 °C | 240–270 °C | 230–250 °C |
The primary performance advantage of PP over PLA is stress-crack resistance and low moisture embrittlement; the primary advantage over ABS is lower density and resistance to dilute aqueous chemicals; the primary advantage over PETG is lower density and better tolerance of repeated flexure, particularly in living-hinge designs. However, unfilled PP is less stiff than PLA and can exfoliate from standard build surfaces. FFF layer voids further reduce transverse elongation and chemical-barrier performance compared with injection-molded PP, so containment parts require informed safety assessment.
Chemical compatibility follows the behavior of polyolefins: dilute mineral acids, aqueous alkalis, and many polar solvents are tolerated; chlorinated hydrocarbons, aromatic hydrocarbons, and strong oxidizing acids can swell or degrade the surface. Immersion testing under ASTM D543 is the appropriate method when qualifying a printed PP part for a specific fluid. The printed material’s voids and weld lines are part of the test sample; they can permit fluid ingress even when the base polymer is resistant.
In low-temperature impact applications, homopolymer PP can become brittle below 0 °C, particularly with high crystallinity and sharp notches. Copolymer PP grades improve impact strength at subzero conditions, but the exact Mitsubishi PP formulation must be confirmed from the datasheet. FFF process-induced notches at layer boundaries are stress concentrators; impact test results may be significantly lower than injection-molded values when measured by ISO 179-1 or ASTM D256.
Pigment concentrates in PP filaments can shift crystallization kinetics. Certain organic pigments used for red, blue, or black grades can act as nucleating agents, raising crystallization temperature and reducing shrinkage but also lowering impact toughness. The color selected for Mitsubishi PP filament may therefore exhibit different warp behavior than natural or white PP. Batch-specific processing instructions should be checked.
Production operators should maintain nozzle temperatures within the manufacturer’s specified melt window, commonly 220–250 °C for FFF-grade PP, and bed temperatures between 80 °C and 110 °C. Enclosure heating is not essential if drafts are controlled, but chamber air circulation should not direct chilled air across the part. Short curtains or insulated build boxes reduce local quench. Print speeds above 60–80 mm/s may require increased melt throughput and higher nozzle setpoint; below 20 mm/s the polymer residence time in the hot end can rise, increasing thermal history. These are process limits, not material certification limits.
Regulatory statements depend on the exact Mitsubishi PP grade and colorant. Many unfilled PP feedstocks are manufactured from resin that is FDA 21 CFR 177.1520 listed for food-contact use, but the printed article may not meet food-contact requirements because of layer voids, process residues, and print-head metal migration. Compliance under RoHS Directive 2011/65/EU and REACH must be verified from the supplier’s SDS and regulatory certificate. The filament should not be combined with strong oxidizing environments above its upper service temperature, and continuous load-bearing parts should not exceed 80 °C unless creep is validated by ISO 899-1. It is not recommended for continuous contact with chlorinated or aromatic hydrocarbons unless validated by immersion testing.
