Formlabs® Silicone 40A


Silicone 40A

Produce 100% silicone parts in-house, in a matter of hours

Formlabs Silicone 40A Resin is an ideal SLA 3D printing material for fabricating functional prototypes, validation units, tooling, and small batches of silicone parts without expensive production costs and low production lead-times.

Silicone 40A. The first accessible pure silicone 3D printing material

Formlabs Silicone 40A resin is the first pure silicone SLA 3D printing material enabled by Formlabs’ Pure Silicone Technology™ to 3D print parts that require pliability and durability even through repeated stretching, flexing or compression. 

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Material Properties

Proto3000_Icons_Tensile Strength


5.0 MPa

Proto3000_Icons_Elongation at Break






Proto3000_Icons_ViscosityVISCOSITY @ 35 ºC

7800 cP

Say goodbye to complicated molding and time-consuming casting processes!


What’s Great about Formlabs Silicone 40A Resin?


Elastomeric Performance  

Manufacture flexible and resilient components with a 230% elongation at break and a tear strength of 12 kN/m, engineered to withstand repetitive stretching, bending, and compression. To ensure peak performance, 3D print silicone parts with outstanding chemical resistance and thermal stability (-25°C to 125°C).

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Freedom of Design with Fast and Easy Fabrication

With Formlabs Silicone 40A resin, you can 3D print custom parts with isotropic properties, fine features as small as 0.3 mm, and complex geometries that aren’t possible with casting or molding.

Image show silicone parts 3D printed with Formlabs Silicone 40A resin


No-tooling Equals Cost Savings

For rapid prototyping and low-volume manufacturing, you can eliminate tooling and labour-intensive casting processes to enable custom and low-volume production of silicone parts.

Image shows 3D printed watch band made with Formlabs Silicone 40A material


The parts 3D printed with Formlabs Silicone 40A material are used in various industries such as consumer goods, automotive, robotics, manufacturing, and healthcare.

Proto3000_Icon_Consumer ProductWearables, handles, and grippers for consumer products

Proto3000_seals gaskets iconSeals, gaskets, grommets, connectors, and dampeners for automotive, robotics, and manufacturing

Customized prosthetics, orthotics, audiology models, and medical devices

Molding-icon-recreated-Proto3000 Flexible fixtures, masking tools, and soft molds for casting urethane or resin

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Formlabs® Best Practices for Designing with
Silicone 40A Resin


Why 3D Printing with Formlabs® Silicone 40A?

Technical Specifications

Mechanical Properties*
Mechanical Properties*
  • Ultimate Tensile Strength: 5 MPa
  • Elongation at Break: 230%
  • Tear Strength: 12 kN/m
  • Stress at 50% elongation: 0.4 MPa
  • Stress at 100% elongation: 1 MPa
  • Stress at 150% elongation: 2.1 MPa
  • Compression Set 23 °C for 22 hours: 20%
  • Bayshore Resilience: 34%
  • Ross Flexing Fatigue at 23 °C: >500 000 cycles
  • Ross Flexing Fatigue at -10 °C: >500 000 cycles
General Properties
General Properties
  • Shore Hardness: 40A
  • Colour: Dark Grey
  • Viscosity (@ 35 ºC): 7800 cP
Thermal Properties
Thermal Properties
Glass Transition Temperature: -107 °C / -161 °F

*The measured properties have been determined through internal testing and will be updated with results from an external lab. Material properties may vary based on part geometry, print orientation, print settings, temperature, and disinfection or sterilization methods used. Data for post-cured samples were measured on Type C tensile bars printed on a Form 3 printer with 100 µm Silicone 40A Resin settings, washed in a Form Wash for 20 minutes in 80% Isopropyl Alcohol / 20% Butyl Acetate, and post-cured at 60 °C for 30 minutes submerged in water in a Form Cure.

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Material Safety Datasheets

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