# Why is there a Tough V4 resin at Preform? New formulation?

**URL:** <https://forum.formlabs.com/t/why-is-there-a-tough-v4-resin-at-preform-new-formulation/13220>\
**Category:** General Discussion\
**Created:** [May 9, 2017, 11:29am UTC](https://forum.formlabs.com/t/why-is-there-a-tough-v4-resin-at-preform-new-formulation/13220 "2017-05-09T11:29:03Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Demetrio](https://avatars.discourse-cdn.com/v4/letter/d/cab0a1/32.png) [@Demetrio](https://forum.formlabs.com/u/Demetrio)\
**Post date:** [May 9, 2017, 11:29am UTC](https://forum.formlabs.com/t/why-is-there-a-tough-v4-resin-at-preform-new-formulation/13220/1 "2017-05-09T11:29:04Z")

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Why is there a Tough V4 resin at Preform? New formulation?

I saw it few weeks ago and I thought it was going to be presented soon.

New colour? I saw the website update yesterday, and when you go to Engineering Resins, it looks completly different.

![](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/b/bd6b27ea9e2afa85c5f10388d29346cbaf208be7.PNG)

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**Author:** ![reinerbenz](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.formlabs.com/reinerbenz/32/6952_2.png) [@reinerbenz](https://forum.formlabs.com/u/reinerbenz)\
**Post date:** [May 9, 2017, 11:47am UTC](https://forum.formlabs.com/t/why-is-there-a-tough-v4-resin-at-preform-new-formulation/13220/2 "2017-05-09T11:47:11Z")

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> [@Phasing out Tough V3](http://forum.formlabs.com/t/phasing-out-tough-v3/12804):
>
> Typically, when we announce a re-formulation, it’s because we’ve made significant changes to a material. In the case of Tough Resin V4, it’s a bit different. Tough V4 will be available through our North American and International stores shortly and can be purchased in the EU thereafter. We switched suppliers for one of the components in Tough Resin and this is the reason for the re-formulation. Mechanical properties are nearly identical for both versions and the primary difference is a more bl…

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**Author:** ![Demetrio](https://avatars.discourse-cdn.com/v4/letter/d/cab0a1/32.png) [@Demetrio](https://forum.formlabs.com/u/Demetrio)\
**Post date:** [May 9, 2017, 12:06pm UTC](https://forum.formlabs.com/t/why-is-there-a-tough-v4-resin-at-preform-new-formulation/13220/3 "2017-05-09T12:06:50Z")

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Thanks! 😃

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**Author:** ![BilsteinUSA](https://avatars.discourse-cdn.com/v4/letter/b/bc8723/32.png) [@BilsteinUSA](https://forum.formlabs.com/u/BilsteinUSA)\
**Post date:** [June 5, 2017, 10:24pm UTC](https://forum.formlabs.com/t/why-is-there-a-tough-v4-resin-at-preform-new-formulation/13220/4 "2017-06-05T22:24:49Z")

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I received the Tough V4 and downloaded the latest preform software update and the V4 is not showing up. Should I just use V3 or is there another software update I am not seeing?

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**Author:** ![Demetrio](https://avatars.discourse-cdn.com/v4/letter/d/cab0a1/32.png) [@Demetrio](https://forum.formlabs.com/u/Demetrio)\
**Post date:** [June 7, 2017, 6:53am UTC](https://forum.formlabs.com/t/why-is-there-a-tough-v4-resin-at-preform-new-formulation/13220/5 "2017-06-07T06:53:42Z")

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![](https://us1.discourse-cdn.com/flex025/uploads/formlabs/original/2X/0/0e83d8c1dc60144cbfb10b7503e93ef8b316f6b4.png)

Since 2.11.1, now we are at 2.11.3.