I was getting my home surveyed because we intend to change the boiler system which lives in its own cupboard. With the familar AIB panelling and chrystotile cement flue, but on getting the asbestos surveyor report was very surprised to see that some (unused - by the look of it) pipe in the cavity contains the Holy Trinity of white, brown and blue types of asbestos.

House was built in '72 (I think) so was surprised to see crocidolite listed when it was sampled along with amosite too. It was my thinking that just about all cement products were exclusively chrysotile. I'm curious what the pipe may be used for and what is in the middle of the pipe, could this have been a water pipe or just a bit of lagging left behind? It looks rather like a pipe within pipe. I didn't ask the surveyor at the time, but curious what this could be?

According to the safety score (MRS) it is low risk, but of course knowing that blue is the "worst" type does cause some concern. I know the fibres are supposed to be more bound it, but still, was not expecting that. I've had many properties sampled over the years and never found all three in cement.

I have seen a viraity of asbosetos types listed in lab reports. As you say its they type of material that determins the classification, so the more "bonded" the asbestos is the lower the risk. While some may argue that "white" asbestos is less of the risk due to it structure in UK we treat all asbestos fibers the same.