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New Durable Resin for Engineering Available Now form Formlabs

Durable Resin, the fourth Formlabs Engineering Resin, is now available to order from the company’s online store

A plastic that’s both stiff and flexible, Durable Resin is perfect for prototyping polypropylene parts. Parts printed with this material bend without breaking, have high impact strength, and are smooth and glossy like an everyday plastic. Durable is ideal for prototyping consumer products, packaging, and low-friction and low-wear moving parts.

Read on to learn more about the range of applications for Durable, how Formlabs developed this material, and what’s changed about the formulation since it was first announced in October.

Strong and Flexible: What Polypropylene is Used For

durable_beadsThe thermoplastic polymer polypropylene (PP), first formulated in the 1950s, is now one of the most commonly used plastics in the world, chosen by product designers for its low modulus and high impact resistance. Common uses for polypropylene include car bumpers, plastic chairs, and food containers. Typically, final polypropylene parts are manufactured through CNC machining or injection molding.

Durable Resin can be used to prototype wear-resistant ball joints.

Durable Resin can be used to prototype parts that look, feel, and behave like polypropylene, for example, impact-resistant cases, snap fits, ball joints, flexures, vacuum formed parts, and large assemblies that need to be disassembled and reassembled. Use this wear-resistant, ductile resin for parts where deformation is preferred to breaking or cracking, or for parts that need to deform multiple times.

Durable Resin, Postcured


Tensile Strength (MPa)


25 – 40

Tensile Modulus (GPa)


1 – 1.5

Elongation (%)


100 – 400

Flexural Modulus (GPa)


1 – 1.5

IZOD Impact Strength (J/m)


100 – 160

HDT @ 0.45 MPa (°C)


70 – 80

To learn more about Durable Resin’s properties, download the material data sheet.

To print with this resin, you’ll need to make sure your software (PreForm and the Form 2 firmware) are up to date. Download the latest software update.

Developing Durable: Improved Properties, Different Color

durable_bottlesIf you’ve been following Formlabs closely, you might have noticed that this material’s color and formulation have changed a bit since it was first announced in October. Formlabs significantly reformulated Durable to improve its mechanical properties.

As the company begun to develop and test Durable in larger quantities, the team realized that it was worthwhile to change the formulation. The mechanical properties of the material we improved, and removed the component that lent to the original yellow color. Hence, the new, frosted clear Durable was born.

Within Formlabs library of engineering materials, the new Durable sits between our Tough and Flexible resins: it’s stiff and strong, but also pliable. Get a full overview of Durable’s properties and how it compares with other Formlabs Engineering Resins.

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