# High Temp and Silicone Vulcanizing

**URL:** <https://forum.formlabs.com/t/high-temp-and-silicone-vulcanizing/31220>\
**Category:** General Discussion\
**Created:** [May 30, 2021, 12:55pm UTC](https://forum.formlabs.com/t/high-temp-and-silicone-vulcanizing/31220 "2021-05-30T12:55:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![estotim](https://avatars.discourse-cdn.com/v4/letter/e/5daacb/32.png) [@estotim](https://forum.formlabs.com/u/estotim)\
**Post date:** [May 30, 2021, 12:55pm UTC](https://forum.formlabs.com/t/high-temp-and-silicone-vulcanizing/31220/1 "2021-05-30T12:55:56Z")

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Hi!  
Does anyone had positive results making silicone molds with vulcanizing silicone where heat goes to 170 C?

I have made experiments with Castaldo and Nicem rubbers, but High Temp printed models stick to it like hell, i have used oil and teflon sprays, but no luck.

I have cured the printed parts well, with UV and heat - no problem in that. I know Formlabs have provided a White Paper where it stands out that High Temp sticks to most of the silicone rubber when vulcanizing, has anyone come over the issue?

I also know that there is possibility to use VLT rubber, but would be really happy if i could use “normal” silicone rubbers. Cheers!

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**Author:** ![alessiospritz](https://avatars.discourse-cdn.com/v4/letter/a/7993a0/32.png) [@alessiospritz](https://forum.formlabs.com/u/alessiospritz)\
**Post date:** [May 31, 2021, 1:54am UTC](https://forum.formlabs.com/t/high-temp-and-silicone-vulcanizing/31220/2 "2021-05-31T01:54:38Z")

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Hi Estotim, I normally use the High Temp resin, and yes, I must use somethimg for separete the resin from the ruber, like everyone resin.

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**Author:** ![Genadijs](https://avatars.discourse-cdn.com/v4/letter/g/e47774/32.png) [@Genadijs](https://forum.formlabs.com/u/Genadijs)\
**Post date:** [June 8, 2021, 10:23am UTC](https://forum.formlabs.com/t/high-temp-and-silicone-vulcanizing/31220/3 "2021-06-08T10:23:43Z")

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Hi, I tried many options and settled on this rubber ([https://www.srs-ltd.co.uk/products/silicone-rubber](https://www.srs-ltd.co.uk/products/silicone-rubber)). I only lightly powder the model with talcum powder before putting it in the rubber. For flat models, I would recommend CASTALDO white label ([https://www.gesswein.com/p-781-castaldo-white-label-mold-rubber-strips-5lb.aspx](https://www.gesswein.com/p-781-castaldo-white-label-mold-rubber-strips-5lb.aspx)). The model does not stick to this rubber at all, but it is problematic to pack it.