I need help from any one who has faced a similar problem and
managed to solve this. I do a lot of liquid silicon molds, and the
problem, +there is no writing instrument whose ink stays
permenanetly on the silicon surface. Any suggestions, solutions ?
Several. If you’re using the clear/transparent rubbers, you can
imbed a small printed paper label within the mold when you pour it.
Or, cut a slit into the rubber and insert such a label after making
the mold. Either way, you can read it through the rubber. If you’re
using opaque rubbers, then it gets a bit more complex. What I did,
and ended up doing with ordinary vulcanized molds too, is take some
small pieces of aluminum sheet, and using “reverse” metal
letter/number stamps, I made a series of little plates comprising a
small font of the needed letters and numbers. These can be stuck to
the inside of the mold frame, and they then leave an impression in
the rubber. The plate is recessed into the rubber and the letter or
number is raised from that recessed surface. The little plates are
pried out and saved for reuse. This works for generic labeling giving
the mold a stock number, date, etc. Not as useful if you wish to put
detailed info onto the mold, but you get the idea. A bit of work to
make the initial set of stamped pieces, but after that, it’s quick
and easy to use.