Re: Grundig TK24 mystery substance
It looks like a piece of white asbestos, very common in radios and TVs of the period. It is not brown or blue asbestos which are the more hazardous types. This type of asbestos was fitted to millions of ironing boards up until the 1960's and in its cement form is present in roofing, garages and guttering throughout the UK. I would just give it a water spray if you want to work around it to reduce the spread of fibres. It is there for a reason, possibly to protect the capacitors from heat, so is difficult to replace with anything else.
Neil
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