Is a "neutrally cross-linked alkoxy silicone sealant" for threaded fittings reef-safe?

Muffin87 · Dec 3, 2021

I'm using Fermit Plastic Thread Seal (more info here) to seal my threaded fittings.
The sealant is suitable for drinking water, and salt water. So I assumed it should be reef-safe?

Any chance anyone can tell me if a "neutrally cross-linked alkoxy silicone" is reef-safe? That's the main ingredient of the sealant.

Thanks a lot!

KrisReef · Dec 6, 2021

I think that you've made a safe assumption based upon the suitability of the product to be used in drinking water, combined with the products good performance with fresh or salt water seals. I wouldn't squeeze a tube directly in the tank but If its safe to "drink" then I think it will work well to seal threads in reef tank plumbing.

I know I didn't give you a completely robust chemistry analysis but the proper understanding of neutrality is likely that it doesn't react with substances found in salt or fresh water that could create a toxic situation as a result of product degredation.

I use a (water supply safe) silicon grease (I didn't read the chemical part of the label) for threaded plastic fittings and o-rings connected to my reef routinely and thus far I have not had any fires as a result.