Formlabs Silicone 40A Resin (Form 4).
Formlabs Silicone 40A Resin.
Silicone 40A Resin 5 L

RS-C2-SI40-01

Formlabs | Silicone 40A Resin

$349.00

Silicone 40A Resin is the first accessible 100% silicone 3D printing material, powered by Formlabs’ patent-pending Pure Silicone Technology™. It eliminates the need for molding or labor-intensive casting, enabling fast in-house production of pure silicone parts in just hours.

With a 40A Shore durometer, 230% elongation at break, and 12 kN/m tear strength, this material produces soft, pliable, and durable parts that withstand repeated stretching, flexing, and compression.

Silicone 40A Resin combines the high performance of silicone with the design freedom of 3D printing, allowing the creation of highly functional parts with excellent chemical and thermal resistance (–25 °C to 125 °C), fine features down to 0.3 mm, and complex geometries not achievable with traditional methods.

IMPORTANT: 5 L Container Requires a Resin Pump to work.
Size

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Post-cured for 45 minutes at 60 ºC in a beaker of water

Shore Hardness

40A

Ultimate Tensile Strength

5.5 MPa

Elongation at Break

230%

Tear Strength

12 kN/m

Rebound Resilience

34%

Glass Transition Temperature (Tg)

-110 °C

Ross Flexing Fatigue (-10 °C, notched)

> 500,000 cycles

Ross Flexing Fatigue (23 °C, notched)

> 500,000 cycles

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Need more information?

We’re committed to providing expert insights and responsive service to guide you every step of the way. To get started, simply fill out the form below and we’ll be in touch shortly.

Silicone 40A Resin by Formlabs

Experience the Benefits

Exceptional elasticity & durability

With ~230% elongation at break and a tear strength of ~12 kN/m, this material performs like molded silicone even for repeated use.

Design freedom with detail

Can create soft, complex geometries and fine features as small as 0.3 mm, unlocking possibilities that traditional silicone methods cannot.

True 100% silicone material

Enables you to 3D print parts made from pure silicone, eliminating the need for expensive molding or casting processes.

Chemical & thermal resilience

Engineered to operate between –25 °C and 125 °C, and resistant to many solvents and chemicals.

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frequently asked questions

What is Silicone 40A Resin used for?

It’s designed for functional prototypes, seals, gaskets, wearables, and medical or consumer products that require flexibility and durability.

Is Silicone 40A Resin made from real silicone?

Yes — unlike flexible photopolymers, it’s a true 100% silicone material, offering authentic softness, elasticity, and biocompatibility.

How flexible is Silicone 40A Resin?

It has a Shore A hardness of 40A, with ~230% elongation at break and excellent tear resistance, making it comparable to molded silicone.

What are the thermal and chemical properties of Silicone 40A Resin?

It withstands temperatures from –25 °C to 125 °C and resists many solvents, oils, and chemicals, ideal for tough environments.

Which Formlabs printers are compatible with Silicone 40A Resin?

It’s compatible with Form 3+, Form 3B+, Form 3L, and Form 4 printers, ensuring smooth, accurate printing of flexible parts.