Yes, you can. You could also use pipe dope, according to my dad. He works for infra source installing natural gas piping.
When the local codes allow its use on the piping as some codes do restrict the use of tape
There are approved Teflon tapes for "gas" but it depends on the HJA and what type of "gas" your asking about
Use the yellow tape. Its specifically for gas. I also use a small amount of pipe dope on the female fittings. Pressure test the new work separately, or if its a small add on use a soap solution to test your work.
Many fittings, except unions, require the use of teflon tape.
Teflon
If you are running natural gas or propane, gas teflon tape. Otherwise, any white teflon plumbers tape is fine.
Nothing, as long as you don't have tape over end of threads.
When the local codes allow its use on the piping as some codes do restrict the use of tape
There are approved Teflon tapes for "gas" but it depends on the HJA and what type of "gas" your asking about
Certain restrictions regarding Teflon such as gas piping require a different type of teflon appreoved for the type of fuel going though the piping When connecting tublar waste lampwick does an amazing job not to be confused with quickwick
Use the yellow tape. Its specifically for gas. I also use a small amount of pipe dope on the female fittings. Pressure test the new work separately, or if its a small add on use a soap solution to test your work.
Teflon tape is a solid.
Many fittings, except unions, require the use of teflon tape.
Teflon tape is a solid.
Teflon tape is a staple in any plumbers tool box. The tape is water proof and does not gum up, causing problems with connection.
While there are Teflon lubricants, Teflon (PTFE) thread seal tape is most definitely for sealing threads. There are relevant standards for these and they are UL listed for such use. Typically for propane & natural gas you would want to use yellow thread seal tape. It is thicker than the standard white. I prefer it over "pipe dope" as it does not harden up with time, and it is guaranteed to have even coverage. In addition to it's ability to seal, the lubricating effects of the tape allow easier tightening of joints, further reducing the liklihood of a leak.
No, teflon tape is not sticky and that's for a good reason. -Most people think of teflon tape as a sealant. However it was originally intended for plumbing use as a sealant AND a lubricant so you can get a tighter connection on the pipe joint.