Formlabs Silicone 40A Resin (Form 4)

A true 100% silicone resin for the Form 4 Series, designed to produce soft, pliable, durable parts with excellent elasticity, tear resistance, chemical resistance, and thermal stability — without molding, casting, or tooling.

Formlabs Silicone 40A Resin (Form 4) cartridge
Category: Elastomeric
Technology: SLA
Material: 100% Silicone
Durometer: Shore 40A
Best for: Seals, gaskets, soft prototypes

Important: Silicone 40A Resin requires a validated wash + post-cure workflow. Follow the manufacturer documentation for approved solvents, wash times, and curing settings.

Print true silicone parts in-house — soft, durable, and ready to validate

Formlabs Silicone 40A Resin enables cost- and time-effective production of functional silicone parts for prototyping, validation units, tooling, and small-batch manufacturing. Produce flexible components that feel like silicone you already specify — with excellent rebound resilience and durability.

Ideal for applications that demand soft touch + tear resistance + environmental stability, Silicone 40A is a strong choice for seals, gaskets, connectors, wearables, grips, and soft robotic components.

Authorised Formlabs Reseller
Optimised for: Form 4 workflow

Why Choose Formlabs Silicone 40A Resin?

True 100% Silicone Parts

Produce soft silicone components directly, eliminating molds and labor-intensive casting steps for faster iteration.

Soft, Durable, and Elastic

Excellent elasticity and tear resistance for functional prototypes and end-use oriented parts that flex repeatedly.

Chemical & Thermal Stability

A strong option for seals and components exposed to demanding environments where typical elastomer-like resins fall short.

Ideal “Validation” Material

Great for proving fit, feel, sealing performance, and ergonomics before committing to tooling and production.

Applications

Silicone 40A Resin is designed for soft, pliable, durable silicone parts across engineering, product design, manufacturing, robotics, automotive, and healthcare prototyping workflows.

Consider Silicone 40A Resin for:

  • Seals, gaskets, and connectors for industrial and automotive applications
  • Wearables and consumer goods prototypes requiring a soft-touch silicone feel
  • Grippers and soft robotics components that need resilience and tear resistance
  • Tooling and fixtures where compliant contact surfaces reduce marking and improve grip

Design tip: Silicone parts benefit from generous radii and smooth transitions to reduce tear initiation points in highly flexed regions.

Workflow Overview

Silicone 40A Resin uses a validated print + wash + post-cure workflow. For successful results, follow manufacturer guidance on approved solvents, wash duration, and post-cure settings.

  • Print using the recommended Silicone 40A preset for your Form 4 printer.
  • Wash using the validated solvent and timing specified by the manufacturer.
  • Post-cure using the validated cycle to achieve intended mechanical performance.
  • Finish carefully — optimise support strategy to minimise marks on cosmetic or sealing surfaces.

(70857)

SKU 70857
Brand Formlabs

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