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Formlabs Silicone 40A Resin enables direct 3D printing of silicone parts. With a Shore hardness of 40A, it produces soft, bendable components with pronounced elasticity. Custom shapes can be developed without first making a casting mould.
Application examples include bellows, soft grippers, protective pads and seal prototypes. Complex contours and tailored contact surfaces can be produced directly from a digital design. This makes the material particularly useful for rapid iterations and developing small quantities of functional silicone components.
Material-specific cleaning and post-curing are essential to the finished result. For seals and grippers, contact geometry, deformation range and the surrounding medium also matter. Resistance and function are assessed for the intended application; the material alone does not establish leak-tightness or a particular service life.
Material information: Formlabs
Application ideas
- Bellows and flexible connectors
- Soft grippers and contact surfaces
- Seal and protective-part prototypes
- Custom silicone parts in small quantities
Properties and test conditions
| Property | Value / condition |
|---|---|
| Manufacturer / grade | Formlabs · Silicone 40A Resin · Identity from input list; see PDF for version |
| Tensile strength | 5 MPa · ASTM D412-06 Type C, 500 mm/min; V1, Rev. 02, 2024-07-01; Form 3, 100 µm; wash: 20 min, 80% IPA/20% butyl acetate; Form Cure: immersed in water, 30 min / 60 °C |
| Elongation at break | 230 % · ASTM D412-06 Type C, 500 mm/min; V1, Rev. 02, 2024-07-01; Form 3, 100 µm; wash: 20 min, 80% IPA/20% butyl acetate; Form Cure: immersed in water, 30 min / 60 °C |
| Shore hardness | 40 A · ASTM 2240; V1, Rev. 02, 2024-07-01; Form 3, 100 µm; wash: 20 min, 80% IPA/20% butyl acetate; Form Cure: immersed in water, 30 min / 60 °C |
Source review: 2026-10-03
Limitations and post-processing
Suitability depends on geometry, orientation, print profile and material condition. Drying, annealing, or washing and post-curing are material- and profile-specific. Material data do not certify a part.