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TPU 90A TPU 90A · SLS powder

TPU 90A is a thermoplastic elastomer with a hardness of 90 Shore A, used for flexible parts such as gaskets, dampers, handles and grippers.
Get a quote in TPU 90A
Powder
Blasted part

TPU 90A is an elastomer, so the part can bend or compress and then return to its original shape. Its hardness is 90 Shore A, which means it is flexible in thin walls and nearly rigid in thick ones.

Elongation at break reaches 310% in X/Y and 110% in Z, and tear strength is 66 kN/m in the XY plane. Compression set is 20.5% at 23 °C and 59.9% at 70 °C, so a gasket kept compressed in heat stays flattened.

In SLS, TPU needs no supports, so you can make lattice structures for cushioning, bellows and parts with internal cavities. The surface is rougher than on the polyamides and dimensions are less accurate. We print it on the Fuse 1+ 30W, and on the Fuse X1 it is announced for June 2027.

Data sheet

TPU 90A properties

These are typical values, measured by the manufacturer on SLS printed test specimens. How your part behaves also depends on its geometry and orientation in the chamber.

Tensile strength (X/Y)
8.7 MPaASTM D412-16, method A
Tensile strength (Z)
7.2 MPaASTM D412-16, method A
Elongation at break (X/Y)
310%ASTM D412-16, method A
Elongation at break (Z)
110%ASTM D412-16, method A
Shore hardness
90AASTM D2240-15
Tear strength (X/Y)
66 kN/mASTM D624-00
Tear strength (Z)
39 kN/mASTM D624-00
Compression set
20.5% at 23 °C, 59.9% at 70 °CASTM D395-18, method B
Vicat softening temperature
94.3 °CASTM D1525
Density (sintered part)
1.14 g/cm³Formlabs internal method
Fresh powder per build
20%refresh rate; the rest is recovered powder

Source: Formlabs, TPU 90A Powder technical data sheet (TDS)

Colours

Colours for TPU 90A

You choose the colour in the quote form. The shades on screen are approximate.

  • Colour of the material

    after blasting

  • Black

    immersion dyed

We don't paint or coat flexible parts, because the coating cracks when the part flexes.

Good for

  • Gaskets and plugs for housings that work at room temperature
  • Dampers and anti-vibration mounts for electronics and drones
  • Grippers and soft fingers for robots
  • Handles and grip surfaces
  • Bellows and flexible covers
  • Lattice structures for cushioning

Limitations

  • The surface is rougher and the dimensional accuracy lower than with PA12.
  • Compression set reaches 59.9% at 70 °C, so it is not suitable for seals that work in heat.
  • It is weaker on Z, with 110% elongation at break against 310% in the XY plane.
  • For now it prints only on the Fuse 1+ 30W, so the part can be at most 165 × 165 × 300 mm.

Surface finishing

  • Blasting in the Fuse Blast (standard), after which the surface stays matte and slightly grainy
  • Vapour smoothing (on request)

Questions about TPU 90A

Can I use TPU 90A for a sealing gasket?

Yes, for static seals at room temperature. Compression set is 20.5% at 23 °C (ASTM D395). At 70 °C the value rises to 59.9%, so the gasket settles and stops sealing.

Why is TPU weaker on the Z axis?

The bond between layers is weaker than the bond within a layer. Elongation at break is 310% in X/Y and 110% in Z, and tear strength is 66 against 39 kN/m. Tell us which direction the part stretches in, so we can orient it with the stretch in the XY plane.

Is TPU 90A safe in contact with skin?

Formlabs tested it to ISO 10993 and found it non-cytotoxic, non-irritating and non-sensitising. You can use it for handles, straps, orthoses and wearable accessories.

Can TPU be printed on the Fuse X1?

Not yet. Formlabs has announced TPU 90A for the Fuse X1 by June 2027. Until then, TPU parts are made on the Fuse 1+ 30W, at a maximum of 165 × 165 × 300 mm.

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