Formlabs Silicone 40A Resin is a liquid silicone rubber material for the Form 4 SLA printer, producing flexible, transparent parts with a Shore A 40 hardness rating. Its biocompatible, skin-safe formulation makes it suitable for medical models, wearable prototypes, and soft-touch consumer product applications.

The 1-litre cartridge integrates directly with the Form 4 and Form 4L automated resin delivery system, enabling reliable dispensing throughout extended print runs. This material excels at overmolding inserts, custom gaskets, ear molds, and any component requiring a rubbery, elastic texture combined with good tear resistance.

Key features

• Shore A 40 hardness for a soft, rubber-like feel in finished parts.
• Biocompatible and skin-safe formulation, suitable for skin-contact and medical prototyping.
• Excellent elongation at break and tear resistance for durable, flexible end-use parts.
• Fully compatible with the Form 4 and Form 4L automated resin cartridge system.
• Transparent appearance straight from the printer for light-diffusing or visual inspection use cases.
• 1-litre cartridge volume minimises interruptions during longer production runs.

Compatible with: Formlabs Form 4, Form 4L