Silicone 40A Resin is the first accessible 100% silicone 3D printing material, enabled by Formlabs' patent-pending Pure Silicone Technology. Unlike flexible resins that blend silicone with monomers or acrylates, Silicone 40A contains no added monomer or acrylate, delivering the superior material properties of cast silicone combined with the speed and design freedom of SLA 3D printing.

Silicone 40A Resin has a 40A Shore durometer, placing it in the soft, pliable range. Parts printed with this material can stretch, flex, and compress repeatedly without failure, with a 230% elongation at break and a 12 kN/m tear strength.

The material offers excellent chemical resistance and thermal stability across a range from -25 °C to 125 °C. Its Ross Flexing Fatigue rating exceeds 500,000 cycles at both -10 °C and 23 °C (notched), making it well suited for parts that undergo repeated mechanical stress.

Silicone 40A Resin can resolve fine features as small as 0.3 mm with a minimum layer thickness of 100 microns, allowing for detailed and geometrically complex parts that are not achievable with traditional casting or molding methods.

The material carries a skin contact biocompatibility rating and is used in applications such as customized prosthetics, orthotics, audiology models, and medical devices. For specific regulatory guidance or to review the latest biocompatibility documentation for your project, contact the Formlabs Regulatory and Quality Assurance team directly.

Silicone 40A Resin is recommended for seals, gaskets, grommets, connectors, and dampeners for automotive, robotics, and manufacturing applications, as well as wearables, handles, and grippers for consumer products. It is also used for customized medical devices, flexible fixtures, masking tools, and soft molds for casting urethane or resin.

Silicone 40A Resin eliminates the tooling and labor-intensive casting processes required by traditional methods. Parts can be produced in-house in a matter of hours, making it a cost-effective solution for functional prototypes, validation units, and small batch production of silicone parts. Complex geometries that are not possible with casting or molding can also be achieved with 3D printing.

Silicone 40A Resin is compatible with the Form 4, Form 4B, Form 3, and Form 3B printers. Compatible tanks include the Form 4 Resin Tank and Form 3 Resin Tank V2.1.

Post-processing involves two main steps. First, wash the part using isopropyl alcohol or an ether-based solution to remove uncured resin from the surface. Formlabs Form Wash or Form Wash L are both compatible. Second, post-cure the part using a Form Cure or Form Cure L unit. Post-curing is essential for parts to achieve their full strength and intended functional properties by completing the chemical reaction initiated during printing.

Wash time settings are available on the Formlabs support site for Form Wash and Form Wash L. Cure settings are available separately for Form Cure V1, Form Cure V2, Form Cure L V1, and Form Cure L V2.

Yes. Formlabs offers a 3D printed sample part so you can see and feel the quality of Silicone 40A Resin firsthand before committing to a purchase. You can request a sample part and have it shipped to your office. For pricing, volume discount tiers, and bulk order options, contact the Formlabs sales team.