I think you meant to type Sindanyo, but I understood anyway:)
Your best bet would be to look in the yellow pages for your nearest
injection mould toolmakers, and then ring them up and ask if they have
a bit spare, depending on how much you want.
Not always used on mould tools, but usually specified when we want to
put heat into a tool, rather than take it out.
Builders merchants should have something similar such as masterboard or
the modern equivalent of Asbestolux.
If you know anyone in a university science labs/workshop you might be
able to scrounge some of the genuine article.
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