"ss" wrote in message ...
On 24/02/2017 10:12, Martin Brown wrote:
Very hard to tell from a photo.

How it fractures (or not) when bent would distinguish brittle epoxy from
the more flexible silicone or acrylic fillers. It could even be a hot
melt PU glue which would soften when warmed up.

None of the obvious cured polymers will be easily softened by heat apart
from a PU hot melt glue.

I think his best bet is a razor blade or scalpel in parallel to the
bench and done with great care to avoid scratching the granite or
personal injury with sharp thin blades that may shatter if forced.

Some tools sold for dismantling iPads spring to mind as suitable.

Apparently it is `soft/bendy` like silicone so I reckon trying heat to start with.

Acetone will soften silicone.

Pour some acetone into a cup (taking care to read all the hazard labels,
and donning the requisite breathing apparatus, goggles, safety
helmet. boots overalls etc. according to taste - or just leave a window
open) and dip the end of a thin bladed pallet knife into the cup then into the
joint. Alternatively using an artists size bristle brush, dip this into the acetone
and paint along the join.Wait a few minutes and if this is successful then dip
and insert the pallet knife as before.
Soft materials like silicone bond as much by suction as by adhesive properties
as such, and so it may be possible as some stage to lever the hob off.
But only after a bit of "give" can be felt in the joint otherwise there's be a risk
of fracture.