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Oh, yes, I agree it's variable and not a uniform material, especially the old stuff. What I meant was that that the teacher seemed to think it was almost a trade in itself beyond us general plumbers requiring specialist equipment to cut and drill and I'd say pulling a passover accurately was a harder skill to learn. She more-or-less talked one of us out of taking on any job involving C.I. (and he had general skills far better than mine). I cut iron with a fine metal cutting disc on a grinder and drill it with a HSS drill bit on a cordless drill (with the torque set down to avoid cracking it if it catches).
I'd already installed 35 metres of the stuff (about half of that was second-hand and made of 5' bits cut off from the split 6' lengths) before I took my plumbing course and not had any real problems (apart from putting a 1:40 fall on some of it due to a typo in the 1969 Readers Digest DIY Manual and one split I hadn't noticed in one of the old bits). When my PVC next breaks, I have some more C.I. in my loft (off a mate's house) to replace it with.
The main problem I had was using bitumen mastic as a jointing compound (in spite of the manufacturer claiming suitability and the fact that the mastic was proper stuff, containing asbestos). I had success with 'dry glaze' rubber strips (designed for windows, but I wasn't paying out (for my own house) for the proprietary C.I. rubber gutter seals, not at the rip-off price I was quoted), but last lot I fitted was a year ago and I just used putty, and I think it's the best way.
If your interested in old skills look on eBay I got 2 sets of Plumbing books dating back to the 1930s show's all the old methods of doing things interesting how a lot of things haven't changed , even sections on gas ,I find the old photos of how cookers & fires & boilers were back then are good to look at