Butaclor MH 30 Polychloroprene rubber Polimeri Europa Rubber - Elastomer >> Chlorinated rubber / Chloroprene, CR ADHESIVE Polychloroprene Rubber [CR ] Butaclor MH 30 Medium rate of crystallization. General purpose grades. Used in adhesives applications when low crystallization rate is desired, also in blend with fast crystallization Butaclor (MA 40 and MA 41) Polychloroprene rubber (CR). Used in adhesives. Possesses medium rate of crystallization. Can be used in blend with fast crystallization CR.