# Platinum Silicone / Grey V4 - good results

**URL:** <https://forum.formlabs.com/t/platinum-silicone-grey-v4-good-results/28011>\
**Category:** General Discussion\
**Created:** [June 20, 2020, 12:09pm UTC](https://forum.formlabs.com/t/platinum-silicone-grey-v4-good-results/28011 "2020-06-20T12:09:23Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![gmoneyphx](https://avatars.discourse-cdn.com/v4/letter/g/e9c0ed/32.png) [@gmoneyphx](https://forum.formlabs.com/u/gmoneyphx)\
**Post date:** [June 20, 2020, 12:09pm UTC](https://forum.formlabs.com/t/platinum-silicone-grey-v4-good-results/28011/1 "2020-06-20T12:09:23Z")

</div>

I printed small cups to test curing platinum silicone in parts form a Form 3. These results are specific to Smooth-On Ecoflex OO-20 and Grey V4 resin. Ecoflex OO-20 was chosen because Smooth-On support says it is one of the most sensitive platinums to cure inhibition.

After printing the test cups I did a 2 stage IPA rinse, then 2 hour cure with both heat (60 deg C) and UV. I waited 24 hours then did another 60C and UV cure for 4 hours. After this cure cycle the parts had NO odor whatsoever which I took as a good sign.

One test cup was coated with Inhibit-X (which helps to prevent inhibition) and the other left bare. I poured the rubber and left it for 12 hours. The rubber in the uncoated cup cured properly (have used this material a lot before so I have a good frame of reference). The rubber in the cup with Inhibit-X cured but also stuck and I mean STUCK to the surface. The Inhibit-X docs mention this sticking possibility and they seem to be correct.

Verdict - Grey V4 with extreme cure seems to play nice with platinum silicone. Different resins and rubbers will behave in their own manner of course. I think a specific test is the only way to know.

 ![IMG_9325](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/1/5129ec2080a3d2bb5c853ddae55f731bdec8bc8c.jpg) ![IMG_9326](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/4/7/4743d4caad5f62c3623783f0986ef5074c15bdb6.jpg)

---

<div class="post-metadata">

**Author:** ![gmoneyphx](https://avatars.discourse-cdn.com/v4/letter/g/e9c0ed/32.png) [@gmoneyphx](https://forum.formlabs.com/u/gmoneyphx)\
**Post date:** [June 22, 2020, 12:42pm UTC](https://forum.formlabs.com/t/platinum-silicone-grey-v4-good-results/28011/2 "2020-06-22T12:42:49Z")

</div>

Draft V1 results (same cure cycle as above):

Inhibit x - cured but again stuck to the point of being useless.  
Uncoated mold - failure. Uncured silicone remained at the interface between the rubber and mold.

Even after the long cure the parts made from Draft V1 still had a slight odor.