SLA – Flexible 80A Resin

Flexible 80A Resin For Hard Flexible Prototypes

Flexible 80A Resin is the most stiff soft-touch material in our library of Flexible and Elastic Resins, with an 80A Shore durometer to simulate the flexibility of rubber or TPU. Balancing softness with strength, Flexible 80A Resin can withstand bending, flexing, and compression, even through repeated cycles. This makes it firmer than Elastic 50A Resin while still offering flexibility and durability. This material is well suited for cushioning, damping, and shock absorption.

Key Material Facts:

• Shore Hardness 80A: The resin has a Shore hardness of 80A, offering a firmer feel compared to softer elastomers like Elastic 50A Resin. This makes it ideal for parts that need to flex but also maintain their shape under stress.
• Durable and Impact Resistant: Flexible 80A Resin has good impact resistance and can withstand repeated stress without cracking or breaking. It is suitable for parts that need to endure bending or compression.
• Tear Resistance: The material exhibits good tear resistance, making it durable for applications that require repeated flexing or loading.
• Smooth Surface Finish: Like other SLA materials, Flexible 80A Resin produces parts with a smooth surface finish, making it suitable for applications where appearance is important.
• Compression and Flexural Strength: The resin maintains good structural integrity under compression and

Common Applications:

• Compliant features for robotics.
• Handles, grips, over molds.
• Low quantity production of small parts.
• Cartilage and ligament anatomy.
• Special effects props and models.
• Seals, gaskets, masks.
  • Check out our page on vacuum / pressure testing tooling using this material.

Material Reference Data:

• For more information on how the SLA printing process works please check out this page.
• For SLA part design trick and tips check out this page.
• Material manufacturers website

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SLA: Flexible 80A Resin Material Properties Data:

	METRIC	ENGLISH	METHOD
Ultimate Tensile Strength	8.9 MPa	1290 psi	ASTM D 412-06 (A)
Stress at 50% Elongation	3.1 MPa	433 psi	ASTM D 412-06 (A)
Stress at 100% Elongation	6.3 MPa	909 psi	ASTM D 412-06 (A)
Elongation at Break	120%	120%	ASTM D 412-06 (A)
Tear Strength	24 kN/m	137 lbf/in	ASTM D 395-03 (B)
Shore Hardness	80 A	80 A	ASTM 2240
Compression Set (23 °C for 22 hours)	3%	3%	ASTM D 624-00
Compression Set (70 °C for 22 hours)	5%	5%	ASTM D 395-03 (B)

SLA: Flexible 80A Resin Solvent Compatibility Data:

Percent weight gain over 24 hours for a printed and post-cured 1 x 1 x 1 cm cube immersed in respective solvent

Solvent	24 hr weight gain, %
Acetic Acid 5%	0.9
Acetone	37.4
Bleach ~5% NaOCl	0.6
Butyl Acetate	51.4
Diethyl glycol Monomethyl Ether	19.3
Hydraulic Oil	1.0
Hydrogen peroxide (3%)	0.7
Isooctane (aka gasoline)	1.6
Isopropyl Alcohol	11.7
Mineral oil (Light)	0.1
Mineral oil (Heavy)	<0.1
Salt Water (3.5% NaCl)	0.5
Skydrol 5	10.7
Sodium Hydroxide solution (0.025% PH 10)	0.6
Strong Acid (HCl conc)	28.6
Water	0.7
Xylene	64.1
Diesel Fuel	2.3

DOWNLOAD THE FULL MATERIAL DATA SHEET

SLA: Flexible 80A Resin Outdoor UV Weather Test:

These parts were left outside from July 2023 – February 2024 to see how this material would hole up to long term UV exposure and weathering (rain and snow), here are the results:

Fresh parts, July 2023:

Outdoor aged parts, February 2024, 7 months:

In conclusion this Flexible 80A material from Formlabs held up very well after 7 months of outdoor weathering even with rough handling.

We also set another copy of this part inside our building next to a window but not where it could get direct sunlight, it showed less over exposure (yellowing) and very similar strength and tear resistance characteristics.

Indoor aged parts (no direct sunlight or weather), February 2024, 7 months:

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SLA: Flexible 80A Resin Part Gallery: