# The optical refractive index of Elastic 50A
**URL:** https://forum.formlabs.com/t/the-optical-refractive-index-of-elastic-50a/35696
**Category:** Support & Troubleshooting
**Created:** [February 16, 2023, 10:04pm UTC](https://forum.formlabs.com/t/the-optical-refractive-index-of-elastic-50a/35696 "2023-02-16T22:04:10Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@hweichen](https://forum.formlabs.com/u/hweichen)
#### Post date: [February 16, 2023, 10:04pm UTC](https://forum.formlabs.com/t/the-optical-refractive-index-of-elastic-50a/35696/1 "2023-02-16T22:04:10Z")
Does anyone know what Refractive Index the Elastic50A resin comes out to after curing? I did find the value for the clear resin is around 1.5. Will it be close to the value of elastic resin?
Weichen
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### Author:  [@Jesse\_K](https://forum.formlabs.com/u/Jesse_K)
#### Post date: [February 17, 2023, 3:17am UTC](https://forum.formlabs.com/t/the-optical-refractive-index-of-elastic-50a/35696/2 "2023-02-17T03:17:28Z")
Hi @hweichen,
Thanks for reaching out! Although I can verify the ~1.5 value for Clear Resin, I wasn’t able to get any info on Elastic 50A. I would advise [getting in touch with our Support Team](https://support.formlabs.com/s/contact-support?language=en_US) for them to look into this further.
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### Author:  [@system](https://forum.formlabs.com/u/system)
#### Post date: [August 18, 2023, 3:18pm UTC](https://forum.formlabs.com/t/the-optical-refractive-index-of-elastic-50a/35696/3 "2023-08-18T15:18:15Z")
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