Nylon 12 Tough is a PA12 grade formulated for ductility. Elongation at break rises to 25% in X/Y and 15% in Z, and notched Izod impact reaches 60 J/m, almost double that of standard PA12 (32 J/m). In return the part is softer, with a modulus of 1450 MPa and 42 MPa tensile strength.
Formlabs recommends it for consistent dimensional accuracy across the whole build chamber and for low warpage on large sections. We use it for flat plates, long frames and bulky parts, which tend to curl in standard PA12.
It performs worse than PA12 at high temperature. Under a 1.8 MPa load it deforms from 46 °C, whereas PA12 holds up to 87 °C. Use it for clips and snap fits, and avoid it for brackets that sit under load in heat. It prints only on the Fuse 1+ 30W.