# How to tell 5% saturation in the Form Wash

**URL:** <https://forum.formlabs.com/t/how-to-tell-5-saturation-in-the-form-wash/19133>\
**Category:** Form 2\
**Created:** [June 9, 2018, 8:53pm UTC](https://forum.formlabs.com/t/how-to-tell-5-saturation-in-the-form-wash/19133 "2018-06-09T20:53:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Thomas\_Anders](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/thomas_anders/32/11359_2.png) [@Thomas\_Anders](https://forum.formlabs.com/u/Thomas_Anders)\
**Post date:** [June 9, 2018, 8:53pm UTC](https://forum.formlabs.com/t/how-to-tell-5-saturation-in-the-form-wash/19133/1 "2018-06-09T20:53:07Z")

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So the Form Wash for doing Tough prints says:  
“Tackiness has been observed on part surfaces when washed in alcohol with more than 5% resin concentration.”

So my question is … how do I adjust my white bobber that came with the Form Wash so that it will show me to change the alcohol at 5% concentration.

I’m doing a lot more Tough prints for my work projects now and I really want to use my expensive Form Wash I bought (when I was originally working with just Black) with a dedicated Tough wash tank but have the prints still come out great by changing it at 5% concentration.

So would love to know the bobble setting to detect this … or some other really easy to way to tell 5% has been reached.

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**Author:** ![Rodrigue](https://avatars.discourse-cdn.com/v4/letter/r/f04885/32.png) [@Rodrigue](https://forum.formlabs.com/u/Rodrigue)\
**Post date:** [June 11, 2018, 9:25am UTC](https://forum.formlabs.com/t/how-to-tell-5-saturation-in-the-form-wash/19133/2 "2018-06-11T09:25:46Z")

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Hey @Thomas_Anders. Maybe the Below link will help you out.

First Use the finish kit to consume lesser the IPA percentage.  
Tough Material: 20 minutes | Tackiness has been observed on part surfaces when washed in alcohol with more than 5% resin concentration.

> **[Measuring IPA's Resin Concentration](https://support.formlabs.com/hc/en-us/articles/115001341970-Measuring-IPA-s-Resin-Concentration)**
>
> As more parts are cleaned, the IPA gradually becomes more concentrated with liquid resin, reducing the effectiveness of Form Wash. Replace IPA when the wash is no longer effective and when parts ha...

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**Author:** ![Thomas\_Anders](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/thomas_anders/32/11359_2.png) [@Thomas\_Anders](https://forum.formlabs.com/u/Thomas_Anders)\
**Post date:** [June 11, 2018, 4:30pm UTC](https://forum.formlabs.com/t/how-to-tell-5-saturation-in-the-form-wash/19133/3 "2018-06-11T16:30:10Z")

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Unfortunately that does that does not help because it only talks about calibration for 10% I need to calibrate for 5% and wanted to know if it’s just halfway or I need to do something else

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**Author:** ![system](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/3X/5/b/5bc2bdf993ff27c2e0eecab5010b25626fbb327a.png) [@system](https://forum.formlabs.com/u/system)\
**Post date:** [June 18, 2018, 4:30pm UTC](https://forum.formlabs.com/t/how-to-tell-5-saturation-in-the-form-wash/19133/4 "2018-06-18T16:30:24Z")

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