Non-toxic, natural, cheap and WATER-PROOF adhesive or glue, is this impossible?
I'm a quality engineer working for a company in Turkey, the company collects the coaldust ( powder form of the coal ) from all the cities of Turkey and makes them briquettes by pressing with very powerful machines. Of course we use some adhesives for mechanical strength of the briquettes. We use CMC (a kind of cellulose) and this material is soluable in water. So our briquettes are not very durable under rain or moisture. Now I have to change the binder or adhesive materials in order to produce waterproof briquettes. I dont know how it's possible. I have to use nontoxic natural materials, and cheap as well. Last week I tried to do something but we were unlucky maybe. I tried to use Technical Gelatin and Alum (Al. Sulphate ) together, the briquettes seemed very good after production but they were not durable when I left them in a cup of water. So I have to find a solution now. Can you help me about that? I'd be very pleased. Thanks.