Formlabs Silicone 40A Resin (Form 3+)

The first accessible 100% pure silicone 3D printing material

Formlabs Silicone 40A Resin is a breakthrough in additive manufacturing, powered by patent-pending Pure Silicone Technology™. It is the first accessible SLA material to offer the performance of 100% silicone without the need for expensive moulds or labour-intensive casting. With a 40A Shore durometer, this resin allows you to produce soft, pliable, and highly durable parts in-house in a matter of hours, significantly reducing lead times for functional silicone components.

Engineered for high-performance applications, Silicone 40A Resin delivers outstanding elastomeric properties, including a 230% elongation at break and a 12 kN/m tear strength. It is capable of withstanding repeated cycles of stretching, flexing, and compression, while maintaining excellent chemical resistance and thermal stability (-25°C to 125°C). This material enables the creation of complex geometries and fine features as small as 0.3 mm that are impossible to achieve through traditional silicone moulding or extrusion.

Key features and industrial benefits:

• Pure silicone performance: 100% silicone chemistry (no added acrylates) providing the superior resilience and feel of cast silicone.
• Outstanding surability: Withstands over 500,000 cycles of flexing fatigue (Ross Flexing test), ensuring long-term reliability for functional parts.
• Design freedom: Isotropic properties allow for complex internal channels and lattice structures that cannot be moulded.
• Cost-effective manufacturing: Eliminates the high cost of tooling for low-volume production and rapid prototyping of silicone parts.

Common applications:

• Industrial components: Custom seals, gaskets, grommets, dampeners, and connectors for automotive and robotics.
• Consumer goods: Flexible wearables, soft-touch handles, grippers, and ergonomic earplugs.
• Medical & healthcare: Patient-specific prosthetics, orthotic liners, audiology models, and medical device components.
• Manufacturing aids: Flexible jigs, fixtures, masking tools, and soft moulds for casting other resins or urethanes.

Post-processing:

Washing

The foundational step in any SLA post-processing workflow is to remove any excess resin on the surface of the parts through an alcohol or ether wash.

Curing

Post-curing Engineering and Specialty Resins is essential for parts to achieve their full strength and functionality. This step completes the chemical reaction initiated during printing, transforming the part from its green state into a fully finished component.

Technical Data Sheet (TDS)