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This has been beaten to death in threads already. I am not going to debate it with you. Teflon has no reaction to butane. Silicone does have a reaction to butane. This is science fact. http://www.coleparmer.com/Chemical-Resistance Teflon is of course PTFE on the list of materials.

Whether or not you asked for help is irrelevant. You posted information that some may feel unsafe. We don't need that. So I posted better information. I'm not trying to help you. I'm trying to prevent the spread of potentially bad information and help the community. Good day, sir.

Take that piece out and blast butane through a well packed SSTB tube. Depending on the fit of your pieces butane WILL start to seep out there eventually with a well pressurized tube. Butane deffinatley touches that, there is no question. I never replace the Teflon wrap unless I feel the need to...

I don't see any point to putting that silicone piece on the threading there. I just use some Teflon pipe thread sealer tape right there to seal that!!! Its impervious to butane.. That silicone I don't know...

It means you won't have butane spraying all over the place or running down the outside of your tube and it will ALL be going through the tube. Of course butane that doesn't make it through the tube doesn't do any extracting, so it can only help to have improved sealing. A better seal will allow...

I don't bother with any of the bullshit plastic tips that come with the tane bottles. If you are going to use tane out of a bottle the best seal you can make is with a few wraps of teflon pipe thread sealer tape. Plastic tips like vectors won't give you a perfect seal. A good fat wrap of teflon...

Ground up, 20-22 grams max. I have 2 of them. I ball up half an unbleached coffee filter and toss that in and pack it into the tube before adding the herb to prevent any material blowing out the top when the can is removed if there is still pressure. Theres no way you could fit an ounce or more...