# What kind of silicone is used for moldable silicone earplugs?

**URL:** <https://boards.straightdope.com/t/what-kind-of-silicone-is-used-for-moldable-silicone-earplugs/917116>\
**Category:** Factual Questions\
**Created:** [August 2, 2020, 10:43pm UTC](https://boards.straightdope.com/t/what-kind-of-silicone-is-used-for-moldable-silicone-earplugs/917116 "2020-08-02T22:43:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Darryl\_Lict](https://avatars.discourse-cdn.com/v4/letter/d/7cd45c/32.png) [@Darryl\_Lict](https://boards.straightdope.com/u/Darryl_Lict)\
**Post date:** [August 2, 2020, 10:43pm UTC](https://boards.straightdope.com/t/what-kind-of-silicone-is-used-for-moldable-silicone-earplugs/917116/1 "2020-08-02T22:43:22Z")

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I was wondering what kind of silicone is used for Mack’s Pillow Soft® Silicone Putty Ear Plugs.

> **[Pillow Soft® Silicone Putty Ear Plugs - Mack's Ear Plugs](https://www.macksearplugs.com/product/pillow-soft-silicone-earplugs/)**
>
> USA's original and #1-selling moldable silicone ear plugs The ultimate in earplug comfort, Mack's® silicone putty molds to the unique contours of any ear #1 Doctor Recommended Brand to get a good night's sleep when sleeping with a snoring spouse ...

Is it something I can buy in bulk and not poison myself?

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**Author:** ![MrDibble](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/mrdibble/32/114_2.png) [@MrDibble](https://boards.straightdope.com/u/MrDibble)\
**Post date:** [August 4, 2020, 1:53pm UTC](https://boards.straightdope.com/t/what-kind-of-silicone-is-used-for-moldable-silicone-earplugs/917116/2 "2020-08-04T13:53:31Z")

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Ask [these guys.](https://www.smooth-on.com/). I’ve found them fairly helpful in the past. If any of their products are applicable, they’ll let you know.

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**Author:** ![Joey\_P](https://avatars.discourse-cdn.com/v4/letter/j/919ad9/32.png) [@Joey\_P](https://boards.straightdope.com/u/Joey_P)\
**Post date:** [August 4, 2020, 4:00pm UTC](https://boards.straightdope.com/t/what-kind-of-silicone-is-used-for-moldable-silicone-earplugs/917116/3 "2020-08-04T16:00:48Z")

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Smooth-on was who I was going to suggest as well. I’ve used some of their two part silicones for pouring into molds. They have a reference on their site that compares the hardness of the various shore ratings to household items (eraser, rubber band etc) so you can get an idea.  
I think some of their products meant for the stage (or to be brushed on to a person) might be squishier instead of rubbery-er. But I’m not sure.

A lot of their products are for sale on Amazon, so you if check the ratings, you may get an idea as to what people used them for and if it worked or not and they’re really popular so going out on google will get you a lot of information. Check forums/reddit too.

EDIT: I just looked the link in the OP. I don’t know if any of the smooth-on products can be reformed after they’ve dried (maybe they can, I really don’t know), so you might want to look into that.