What is HRA and Vicalex?

Posted in: , on 8. Aug. 2007 - 12:30

Two simple questions here:

What is HRA? The only thing about it is: it is an additive for a fine plaster. But what is it?

What is Vicalex? I know it is, again, an additive for plasters but what? Google search gives irrelevant results.

Please help me.


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