3D Printing InfoFilament comparison
PA6/66 vs PP
Compare printing settings, strength, heat resistance, dated prices and sources.
2 selected · all documented properties
| Property | PA66 (Nylon 66)PA | Polypropylene (PP)POLYOLEFIN |
|---|---|---|
| Market snapshot | ||
| Listing priceUSD/kg; dated snapshots | Not documented | $46.56/kg median; $31.99–$53.00/kg across 4 dated product listings |
| Identity & Market | ||
| Base polymer / chemistry | Polyamide 66, condensed from hexamethylenediamine and adipic acid; melts around 40 °C above PA6[1] | Polypropylene — a semi-crystalline polyolefin with no polar groups, so it neither absorbs water nor bonds to most bed surfaces[2][3] |
| Densityg/cm³ | 1.14 (extruded unfilled PA66 stock)[4] | 0.91 (Prusa PP composite, ISO 1183) — the lightest common filament[5] |
| Typical priceUSD/kg | Not documented | 1 kg-equivalent spools span 27–53; the middle of the market is about 44[6][7][8][9] |
| Price range across brandsUSD/kg | Not documented | 27–53 across brands; Reli3D 32 on Amazon, SUNLU 44 at 0.8 kg, Fiberlogy 49 at 750 g, IEMAI 3D 53, and the 3DJake PP listing spans 27–49[6][10][7][8][9] |
| Market availability1–5 | Special order, 1–2 makers worldwide — no unfilled PA66 filament appeared in any catalogue searched, and the 3DXTech nylon range offers PA6, PA12 and a 6/66 copolymer but no straight PA66[11][12] | Available from several mainstream brands[10][7][6] |
| Spool sizes & diameters | Not documented | 1.75 and 2.85 mm; 0.75 kg spools are common[7] |
| Typical applications | Not documented | Living hinges, chemical-resistant containers, automotive clips and packaging prototypes[2] |
| Printing Parameters | ||
| Nozzle temperature°C | Not documented | 210–230 (Braskem-type PE/PP window); Formfutura's Centaur PP melts at 205 ± 15 °C[2] |
| Enclosure / chamber requirement1–5 | Enclosure required (passive)[1] | Enclosure recommended — Simplify3D lists an enclosure as a hardware requirement and Polymaker advises one below 70 °C ambient to stop warping and cracking[13][3] |
| Part cooling fan | Not documented | Part cooling fan required (Simplify3D)[13] |
| Bed surface & adhesion aid | Not documented | Packing tape, a polypropylene sheet, or a PP-specific adhesive such as Magigoo PP — ordinary PLA and ABS adhesives do not hold it[13][3] |
| Warping tendency1–5 | Not documented | High — enclosure needed for reliable large parts; PP's crystallinity drives shrinkage and Prusa recommends a brim on its PP grades[5][14] |
| Bed-adhesion difficulty1–5 | Not documented | Very difficult — special plates or slurry required. PP bonds to almost nothing; a polypropylene-specific tape or adhesive is the normal answer[5][3] |
| Stringing / oozing tendency1–5 | Not documented | Slight — Polymaker advises 1–2 mm retraction at 20–30 mm/s[3] |
| Overall printing difficulty1–5 | Advanced — enclosure, hardware upgrades, tuning[1] | Advanced — enclosure, hardware upgrades, tuning; bed adhesion is the whole problem[3][5] |
| Hardware Wear & Reliability | ||
| Nozzle hardness required1–4 | Not documented | Brass fine indefinitely for unfilled grades — Simplify3D states no special hotend is required[13] |
| Abrasiveness1–5 | Not documented | Non-abrasive when unfilled[13] |
| Nozzle clog risk1–5 | Very high — frequent jams without careful setup[15][16] | Low — Simplify3D lists no special hotend requirement for PP and clogging is not among its listed drawbacks[16][13] |
| Heat-creep / jam sensitivity1–5 | Not documented | Slightly sensitive[13] |
| Hotend requirement | Not documented | No special hot-end required (Simplify3D)[13] |
| Moisture Behaviour | ||
| Moisture absorption (hygroscopicity)1–5 | Very high (>2 %)[16] | Negligible (<0.1 % EMC) — Prusa measures 0.03 % in 24 h and 0.04 % in 7 days on its PP composite, the lowest figures it publishes for any filament[5] |
| Equilibrium moisture content at ~50 % RH% | 8.5 at saturation on extruded PA66 stock (ASTM D570) — the highest uptake of any polymer in this dataset[4] | 0.03 after 24 h and 0.04 after 7 days at 24 °C / 22 % RH (Prusa Polymers, measured on its PP composite)[5] |
| Drying temperature & time | Not documented | No drying step is published for PP; uptake is below the level that affects printing[5] |
| Symptoms when wet | Not documented | Bubbling and popping at the nozzle; Polymaker still advises a 70 °C dry for 4–6 h despite the low uptake[3] |
| Effect of moisture on strength | Measured dry against wet on printed specimens at 6.16 % moisture (Polymaker CoPA): tensile 78.0 → 34.3 MPa, Young's modulus 2703 → 724 MPa, flexural strength 109.8 → 22.6 MPa, while notched Charpy rises 6.9 → 27.7 kJ/m² and elongation 12.7 → 13.2 %[17][15] | Not applicable in practice — with equilibrium uptake at 0.04 %, there is no moisture-driven strength loss to measure. Polymaker's sensitivity tiers put polyolefins below even PLA[5][16] |
| Storage requirement | Not documented | No special storage needed[5] |
| Mechanical Properties | ||
| Tensile strength (XY)MPa | 82.7 at yield and 84.8 at break on extruded PA66 stock (ASTM D638; converted from 12,000 and 12,300 psi) — no printed figure exists because no unfilled PA66 filament was found[4] | 12 at yield (Formfutura Centaur PP, ASTM D638)[2] |
| Young's modulusMPa | 2413 on extruded PA66 stock (ASTM D638; converted from 350,000 psi)[4] | 724 on extruded PP stock (ASTM D638; converted from 105,000 psi)[18] |
| Elongation at break% | 50 at break on extruded PA66 stock (ASTM D638)[4] | Above 600 at break (Formfutura Centaur PP, ASTM D638)[2] |
| Flexural strengthMPa | 113.8 on extruded PA66 stock (ASTM D790; converted from 16,500 psi)[4] | 31.0 on extruded PP stock (ASTM D790; converted from 4500 psi)[18] |
| Flexural modulusMPa | 3034 on extruded PA66 stock (ASTM D790; converted from 440,000 psi)[4] | 402 flexural modulus (Formfutura Centaur PP, ASTM D790) — an order of magnitude below any rigid filament[2] |
| Other impact data | Izod 53 J/m on extruded PA66 stock, converted from 1.0 ft-lb/in (ASTM D256)[4] | Izod notched 112 J/m on extruded PP stock, converted from 2.1 ft-lb/in (ASTM D256)[18] |
| Brittleness1–5 | Not documented | Very ductile — bends far before failing[2] |
| Hardness (scale-specific)Shore A / Shore D / Rockwell | Shore D 86 and Rockwell 85 (108) — the source does not name the scales on extruded PA66 stock (ASTM D2240, D785)[4] | Rockwell R102 (and M95) on extruded PP stock (ASTM D785)[18] |
| Creep resistance / sustained load1–5 | Not documented | Below average[2] |
| Fatigue / repeated-flex resistance1–5 | Excellent — living hinges viable[1] | Excellent — living hinges viable, the classic polypropylene application[2] |
| Elasticity / flexibility1–5 | Semi-flexible[15] | Semi-flexible[2] |
| Wear resistance & friction | Wear factor 200e-10 in3*min/(ft*lb*h) on extruded PA66 stock (ASTM D3702); Ensinger lists very good slide and wear properties[4] | Not documented |
| Thermal Properties | ||
| HDT at 0.45 MPa°C | 232 on extruded PA66 stock (ASTM D648 at 66 psi; converted from 450 °F)[4] | 74 on extruded PP stock (ASTM D648 at 66 psi; converted from 165 °F)[18] |
| HDT at 1.8 MPa°C | 90 on extruded PA66 stock (ASTM D648 at 264 psi; converted from 194 °F) — the gap to the 0.45 MPa figure is the widest in the dataset[4] | Not documented |
| Melting point / Vicat°C | 255 melting on extruded PA66 stock (ASTM D2133; converted from 491 °F)[4] | 205 ± 15 melting (Formfutura Centaur PP)[2] |
| Continuous service temperature°C | 85 long term and 149 short term on extruded PA66 stock (converted from 185 °F and 300 °F)[4] | Bounded by a melting point of 205 ± 15 °C and by the 158 °C heat deflection of the carbon-filled grade; no loaded-bar service figure is published for unfilled PP[2][5] |
| Thermal expansion (CTE)µm/m·K | 81.0 (extruded PA66 stock, ASTM D696; source states 4.5e-5 in/in/°F)[4] | Not documented |
| Flammability / UL 94 | UL 94 V-2 on extruded PA66 stock[4] | Flammable; no UL 94 rating published for the grades surveyed[5] |
| Environment & Chemical | ||
| UV resistance1–5 | Not documented | Months outdoors before embrittlement — unstabilised polypropylene chalks under UV[3] |
| Chemical resistance | Not documented | Excellent against acids, alkalis and most solvents — the usual reason to choose PP[3] |
| Water / humidity resistance in service1–5 | Not documented | Excellent — essentially unaffected[5] |
| Food contact | Not documented | Polypropylene is a common food-packaging polymer, but no filament here carries a food-contact certification[3] |
| Biodegradability / compostability | Not documented | Not biodegradable[3] |
| Recyclability | Not documented | Mechanically recyclable as resin code 5, but printed waste is not accepted in household collection[3] |
| Electrical & ESD properties | Volume resistance 1e15 ohm-cm and dielectric constant 4 on extruded PA66 stock (ASTM D257, D150)[4] | Not documented |
| Health & Safety | ||
| Fume toxicity1–5 | Moderate — measurable VOCs and UFPs, ventilation advised[19] | Low hazard — minimal VOC and particle emission. Inferred: no polyolefin was among the nine filaments in the Azimi chamber study, so this is a family-level judgement rather than a measurement[19] |
| VOC emission rateµg/min | Up to 180 caprolactam, the dominant VOC from nylon; total VOC reached nearly 200 µg/min, the highest of the nine filaments tested[19] | Not documented |
| Ultrafine-particle emission rateparticles/min | ≈2 × 10⁸ median — low for ultrafine particles despite the highest VOC mass of any filament tested[19] | Not documented |
| Hazardous species emitted | Caprolactam, at up to 180 µg/min from nylon filament — the largest single-VOC emission rate measured in the study[19] | Not documented |
| Ventilation / filtration requirement1–5 | Ventilated room or enclosure recommended[19] | Open a window / occasional ventilation. Inferred — no polyolefin was measured in the chamber study[19] |
| Post-Processing | ||
| Sanding & machining | Not documented | Sands poorly — the waxy surface loads abrasive paper[13] |
| Painting & finishing | Not documented | Paint and adhesives do not key to untreated PP; flame or plasma treatment is normally needed first[3] |
| Gluing & solvent welding | Not documented | Nothing common bonds untreated PP; flame or plasma treatment is needed before adhesives key[3] |
| Vapour / chemical smoothing | Not documented | No practical vapour smoothing[13] |
| Support material pairing | Not documented | Prints its own supports; no soluble support is rated for PP[13] |
| Dimensional accuracy & detail | Not documented | Shrinkage and warping dominate; the low modulus means parts flex rather than hold tolerance[5] |
| Solvents & Solubility | ||
| Soluble in | Dissolved at 23 °C by formic acid above ~80 %, phenol, m-cresol, 96 % sulphuric acid or hexafluoroisopropanol — laboratory reagents.[20] | None at room temperature; chloroform dissolves it at 60 °C and xylene at about 118 °C — the xylene-solubles route.[21][22] |
| Softened or crazed by | Zinc chloride solutions stress-crack it — 10 % marginal, 37 % not resistant; alcoholic calcium chloride dissolves it.[20] | Xylene, decalin, CCl4 and chlorobenzene are heavily absorbed at 20 °C; oleum, chlorosulphonic acid and bromine destroy it.[21] |
| Solvent welding & smoothing agent | None — nylon's only solvents are formic acid, phenol and HFIP, all of which degrade the part they wet.[20] | None — nothing softens PP at room temperature, so joints have to be welded thermally rather than chemically.[21] |
Material entries describe families or representative grades, not an interchangeable specification for every spool. Test methods, orientations and conditions may differ. Unknown values are marked “Not documented”. Prices and source dates remain historical snapshots; check the linked guide for product details. Differences highlight text, not a universal winner.
Sources for this comparison
- PA (Nylon) — material basics Polymaker Wiki · 2026-08 · doc
- Centaur PP Technical Data Sheet Formfutura · 2026-08 · tds
- PP — material basics Polymaker Wiki · 2026-08 · doc
- TECAMID 66 natural (PA66) — stock shape properties Ensinger · 2026-08 · tds
- Prusament PP Carbon Fiber Technical Datasheet v1.0 Prusa Polymers · 2024-11 · tds
- SUNLU product catalogue SUNLU · 2026-08 · vendor
- Fiberlogy PP Natural — product page 3DJake International · 2026-08 · vendor
- Reli3D Low Warp PP Filament 1.75 mm 1 kg Black — Amazon listing Amazon.com · 2026-08 · vendor
- IEMAI 3D PP 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
- PP filament listing 3DJake International · 2026-08 · vendor
- 3DXTech product catalogue 3DXTech · 2026-08 · vendor
- Polymaker product catalogue Polymaker · 2026-08 · vendor
- Polypropylene — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
- Prusament PP Glass Fiber Technical Datasheet v1.0 Prusa Polymers · 2024-11 · tds
- Moisture Conditioning — effect on printed nylon properties Polymaker Wiki · 2026-08 · doc
- Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
- PolyMide CoPA Technical Data Sheet V5.4 (dry and wet status blocks) Polymaker · 2024-11 · tds
- TECAFINE PP natural — stock shape properties Ensinger · 2026-08 · tds
- Emissions of Ultrafine Particles and Volatile Organic Compounds from Commercially Available Desktop Three-Dimensional Printers with Multiple Filaments (Azimi et al.) Environmental Science & Technology 50(3) 1260-1268 · 2016-01 · paper
- Ultramid Nylon Chemical Resistance guide (unmodified PA6 B27E and PA66 A27E) BASF · 2026-08 · tds
- Pro-fax and Moplen polypropylene — Chemical Resistance Guide (20, 60 and 100 °C) LyondellBasell · 2026-08 · tds
- US 5,278,282 Polymer recycling by selective dissolution — xylene dissolution temperatures Nauman & Lynch, Rensselaer Polytechnic Institute · 1994-01 · paper