On 30/03/2021 19:37, gareth evans wrote:
I#ve recently re-washered the H & C taps on the
bathroom handbasin.

Now, both washers were from the same batch, but
whereas that on the cold tap remains soft (and
requiring more and more turns to shut it off),
that on the hot tap has gone hard and seems to
be dripping again unless screwed down hard.

I suspect that the hot tap needs reseating,
but it there any explanation for the differing
performance between the H & C?

Rubber washers have a high temperature coefficient of expansion, so what
might be shut off when hot may not be when cold.

The other problem I have come across it the tap thread, where it becomes
stiff when under pressure. I would suggest an application of silicone
grease on the threads to see if this helps.