Why Choose Silicone 40A Resin

The First Accessible 100% Silicone 3D Printing Material

Silicone 40A Resin is a pure silicone, without added monomer or acrylate, enabled by Formlabs’ new patent-pending Pure Silicone Technology™. Silicone 40A Resin combines the superior material properties of cast silicone with the benefits of 3D printing.

Outstanding Elastomeric Performance

Fabricate soft, pliable, and durable parts with a 230% elongation at break and a 12 kN/m tear strength that can withstand repeated cycles of stretching, flexing, and compression. Produce highly functional silicone parts with excellent chemical resistance and thermal stability (-25°C to 125°C).

Cost-Effective Rapid Prototyping and Low Volume Manufacturing

Eliminate tooling and labor-intensive casting processes to enable custom and low-volume manufacturing of silicone parts.

Newfound Design Freedom

Create customized silicone parts with isotropic properties, fine features as small as 0.3 mm, and complex geometries that aren’t possible with casting or molding.

Fast and Easy Fabrication

Benefit from the streamlined Formlabs SLA ecosystem to produce pure silicone parts in-house, in a matter of hours.


Silicone 40A Resin is a cost and time-effective solution for fabricating functional prototypes, validation units, tooling, and small batches of silicone parts. Parts printed in Silicone 40A Resin are soft, durable, with excellent elasticity, chemical resistance, and thermal stability. They are used in industries such as consumer goods, automotive, robotics, manufacturing, and healthcare.

Consider Silicone 40A Resin for:

Seals, gaskets, grommets, connectors, and dampeners for automotive, robotics, and manufacturing.
Wearables, handles, and grippers for consumer products.
Customized prosthetics, orthotics, audiology models, and medical devices.
Flexible fixtures, masking tools, and soft molds for casting urethane or resin.

Material Properties

Post-cured for 30 minutes at 60 ºC

Shore Hardness


Ultimate Tensile Strength

5.5 MPa

Elongation at Break


Tear Strength

12 kN/m

Rebound Resilience


Glass Transition Temperature (Tg)

-110 °C

Ross Flexing Fatigue (-10 °C, notched)

> 500,000 cycles

Ross Flexing Fatigue (23 °C, notched)

> 500,000 cycles




Form Wash Settings


20 min 



Use Form Wash filled with 8 L of IPA and 2 L of n-Butyl Acetate. After washing, dry the parts for a minimum of 60 minutes.

Form Cure Settings


45 min



60 °C


Fully submerge the dry parts in water in a glass beaker placed inside Form Cure.