SLA Material – Elastic 50 A Resin

Elastic 50 A Resin For Soft Flexible Parts

Our softest Engineering Resin, this 50A Shore durometer material is suitable for prototyping parts normally produced with silicone. Choose Elastic Resin for parts that will bend, stretch, compress, and hold up to repeated cycles without tearing.

Common Applications:

Compliant features for robotics.
Wearables and consumer goods prototyping.
Low quantity production of small parts.
Medical models and devices.
Special effects props and models.
Compressible buttons.

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SLA: Elastic 50 A Material Properties Data:

	METRIC	ENGLISH	METHOD
Ultimate Tensile Strength	3.23 MPa	468 psi	ASTM D 412-06 (A)
Stress at 50% Elongation	0.94 MPa	136 psi	ASTM D 412-06 (A)
Stress at 100% Elongation	1.59 MPa	231 psi	ASTM D 412-06 (A)
Elongation at Break	160%	160%	ASTM D 412-06 (A)
Tear Strength	19.1 kN/m	109 lbf/in	ASTM D 624-00
Shore Hardness	50A	50A	ASTM 2240
Compression Set (23 °C for 22 hours)	2%	2%	ASTM D 395-03 (B)
Compression Set (70 °C for 22 hours)	9%	9%	ASTM D 395-03 (B)

SLA: Elastic 50 A Solvent Compatibility:

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%	< 1
Acetone	19.3
Bleach ~5% NaOCl	< 1
Butyl Acetate	18.2
Diesel Fuel	1.2
Diethyl glycol Monomethyl Ether	12
Hydraulic Oil	< 1
Hydrogen peroxide (3%)	< 1
Isooctane (aka gasoline)	< 1
Isopropyl Alcohol	13.3
Mineral oil (Light)	< 1
Mineral oil (Heavy)	< 1
Salt Water (3.5% NaCl)	< 1
Skydrol 5	9.9
Sodium Hydroxide solution (0.025% PH 10)	< 1
Strong Acid (HCl conc)	14.2
Water	< 1
Xylene	20.4

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SLA: Elastic 50 A 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 Elastic 50A material from Formlabs held up ok after 7 months out door weathering but with rough handling started to tear and break down.

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 also was stronger and could be handled roughly without tearing: