An ointment for treating hemorrhoids "petrient"

For me it seems peculiar that you are only now getting problems.  

Before starting the analysis of the problem here is the qualitative composition of Orabase  :   Orabase is composed or gelatin , pectin and sodium carboxymethylcellulose in Plastibase (plasticised hydrocarbon gel).   Plastibase is a substitute for petroleum jelly. It is polyethylene resin dispersed with a special technique in liquid paraffin.

so Orabase is full of negatively charged polymers, which can certainly regaren with Zn ions, which we can find in the presence of water.  

So the first draw conclusion is "avoids all water". Starch is found In your composition. And starch is known as a carbohydrate, capable of adsorbing a very important amount of water without therefore being curable. So it must be ensured that drying at 110 ° C creates the starch powder dry.  

If no better result is obtained with this recommendation, the possibility of preparing a modified Orabase will continue.