silicone grease for plumbing

Obviously you don't need it to be food safe, but won't hurt if you don't find anything else

For a stickier version:

Also good for outdoor RF connectors, so they say.

BES sell plumber's grease.

HT (High Tack) is thicker, where you don't expect movement, or where you want to be able to feel resistance to movement. Otherwise use the Low Tack grease where you expect the surfaces to slide.

from the comments section

"appears to be petroleum based rather than silicone based"

I normally order it in tubes from CPC. One will last for years!

That's often not silicone though (often something like a tub of "black swan" grease)

I've had mine for too long to say it's still the same, but mine's definitely silicone. It might have been changed, of course.

I got mine from Toolstation

The safety sheet on that page suggest petroleum based

The typical flash point for a silicone grease is 300C whereas that for the Plumbers Grease sold by Toolstation is 149C also indicating that it's probably not a Silicone Grease.

Not knowing why the manufacturer has specified a silicone grease it would be unwise to use anything else that may attack the seals rather than just lubricating threads.

Some Plumbers' Grease does seem to be silicone grease but the tub/tube mentions that in the name.

SF has

I presume that's the slimy liquid that the flopast 110mm soil fittings come slathered with ... good to make initial assembly easier, but not really intended to provide lubrication of working parts?

As I said in another post, silicone grease etc. isn't a good lubricant for plain, loaded, surfaces. I'm going to get some of the TS one to see what its like. Another point is that the TS one might be easier to remove. I've worked in an electroplating lab and in an electronics factory; silicone grease is v. bad if it gets near plating, painting, soldering or glueing, and it's bloody hard to remove.