What is MJF PA 12 nylon?
PA 12 is a production nylon (polyamide 12) printed on our MJF (Multi Jet Fusion) platform. It's watertight, dimensionally stable to a 175 °C heat deflection temperature and the lowest cost per part of any material we run — the workhorse for housings, enclosures, ducting and end-use production parts.
Is MJF PA 12 watertight?
Yes. MJF fuses the powder solid rather than depositing it in beads, so there are no layer gaps for fluid or air to weep through — ducting, fluid-adjacent housings and enclosures seal without a coating step. Vapour smoothing seals the surface further where the part has to hold pressure or be cleaned repeatedly. If the part is a pressure vessel or safety-critical, tell us at quote and we'll advise on testing.
What is MJF PA 12 used for?
Housings and enclosures, ducting and manifolds, watertight production parts, low-volume production runs, functional end-use parts, brackets and mounts, lattices and complex geometry, air vents and trims, and jigs and fixtures.
What is the difference between MJF PA 12 and SLS PA 12?
Same nylon, two powder-bed processes. MJF fuses whole beds at once using a fusing agent and infrared energy, which generally makes it faster and cheaper per part once the bed is nested full, and it produces watertight parts as standard. SLS uses a laser to sinter each cross-section and comes out slightly more ductile at 25% elongation against 20%. Send the CAD and the quantity and we'll tell you which suits the job.
How strong is MJF PA 12?
48 MPa ultimate tensile strength with 20% elongation at break and 3.5 kJ/m² notched impact. That is a solid production nylon — enough for housings, ducting and functional end-use parts, but not an engineering load-path material. For that, FDM PA6-CF reaches 109 MPa.
Is MJF cheaper than injection moulding?
It depends entirely on quantity. There is no tool to pay for, so MJF wins outright at low and mid volumes and gets you parts in 5–7 days rather than eight weeks. Injection moulding wins on unit cost once you are amortising the tool across very large runs. The crossover point depends on part size and geometry — tell us your annual quantity and we'll be straight with you about where you sit.
How many MJF parts can you produce?
Our instant quote handles anything from one part to 100,000. MJF prices by the build rather than by the part, so the cost per part falls as the bed fills — a nested batch prices far better than the same parts ordered one at a time.
What finishes are available for MJF PA 12?
Bead-blasted grey as standard — uniform matte grey with clean detail, ready to fit. Through-dyed black, so the colour runs through the section and won't chip or flake. Or vapour smoothed, chemically sealed to a semi-gloss skin that is easier to clean and genuinely sealable. All three happen in our building, on our machines, with no third party in the chain.
Where can I find MJF PA 12 material properties and a datasheet?
The key material properties are listed above, and you can download the full MJF PA 12 datasheet (PDF) or have the figures confirmed with your instant online quote.
How do I order MJF PA 12 nylon parts in the UK?
Upload your CAD to our instant online quote and select MJF PA 12. As a UK 3D printing service bureau we print, finish and inspect every part in-house in Shipston-on-Stour, Warwickshire, and ship UK-wide — from one part to a hundred thousand, in 5–7 days.
