How to seal pipes or entire openings

Since I work from home and also sleep in the basement, I have been thinking about the issue of radon gas. Although I do not live in a risk area, I want to play it safe and seal the pipes or the gaps between the pipes. Most of the pipes are installed only inside the house, but at least one of them goes into the ground.

So far, I have come across silicone or acrylic. Which one is better, or is there anything else? Would hot glue actually work?

Best regards

Michael

So seal the pipe? Expanding foam.

Sorry, forgot to write, yes I definitely want to seal the pipes. Isn't PU foam too high an air pollutant in the sleeping area?

Neither silicone nor acrylic, and also expanding foam is not the right solution. There are sealants such as Sikaflex for something like this.

Which Sikaflex exactly? I just looked at some products randomly, they only go up to 40mm. That’s no good for filling a pipe -> construction foam, even though left me an angry smiley there :)

Acrylic and silicone are out for the same reason, they won’t dry in the required thickness.

Why does silicone actually not work, does it become leaky over time? What time frame are we talking about? I thought I would try silicone with screws inserted (for removal) and renew it after 10 years? This Sikaflex, does it then last forever? You can't get it off anymore, can you?

How do I prevent the silicone / Sikaflex from running further into the pipe? Is there a trick for that?