>>>I do not know, if I find an answer, but the reason that I am looking for
healthy substitutes for dichromates is that it is not allowed to use them
at many institutions in Scandinavia, where the security health regulations
are very strict.
>>I am not working with Ulano products as Murakami screen products are at
least just as good,they tell me. That is the reason why the whole
silkscreen industry in Norway turned over to it.
>>Compositions are firms secrets, I understand.
>>Could someone tell more about the principals for photopolymers. Why can
they be just as harmfull as dichromates ? Now I am talking about
photopolymers, that are developed in water.
Every silkscreen emulsion and silkscreen emulsion sensitizer I am aware of
DOES contain dicromate. I always suggest to others to use a premixed
product rather than compound it themselves. Dicromates are potentially
dangerious.
Dicromate sensitizers will harden and become insoluable to the action of
the developer (Water) upon exposure to UV light. Every protected ares will
wash out. It is this hardening action that makes dicromate based emulsions
so usefull. I can think of a hundred uses for these materials.
RM