Formlabs Flexible 80A Resin is a specialized photopolymer material formulated for Stereolithography (SLA) 3D printing, particularly optimized for use in Formlabs’ range of 3D printers. This resin is designed to simulate the flexibility of rubber, featuring a blend of photopolymer resins, photoinitiators, and elastomeric additives.

Physical Properties

  • Density: Typically around 1.1–1.2 g/cm³
  • Tensile Strength: Generally in the range of 20-40 MPa, depending on the post-curing process
  • Elongation at Break: Exceptionally high, often exceeding 100%, giving it rubber-like flexibility
  • Shore Hardness: Approximately 80A, which is similar to rubber materials

Aesthetic Quality

Formlabs Flexible 80A Resin produces prints with a smooth surface finish, usually available in clear or lightly tinted colors. The material captures fine details well and is often used in applications where both aesthetic appeal and functional flexibility are required.

Durability and Usage

Engineered for high flexibility, this resin is designed for applications that require rubber-like elasticity and durability. It’s particularly suitable for gaskets, seals, flexible hinges, and other parts that need to bend, flex, or withstand torsional stress without tearing.


The post-processing steps typically involve washing the printed object in a solvent like isopropyl alcohol to remove uncured resin, followed by UV curing to achieve the best mechanical properties. The material can be further cut, sanded, and even lightly stretched. It also generally adheres well to common types of flexible adhesives.

Environmental Impact

Like most SLA resins, Flexible 80A is not biodegradable and should be disposed of responsibly to mitigate its environmental impact. The material is not derived from renewable resources, making it less eco-friendly compared to bio-based materials like PLA.

In summary, Formlabs Flexible 80A Resin offers a specialized material optimized for applications requiring high flexibility and durability. While not the most environmentally friendly option, its unique mechanical properties make it invaluable for specialized projects requiring elasticity similar to rubber. Responsible handling and disposal are essential given its environmental impact.

Formlabs Flexible 80A – Technical Data Sheet