Butaclor MA 40S Polychloroprene rubber Polimeri Europa Rubber - Elastomer >> Chlorinated rubber / Chloroprene, CR ADHESIVE Polychloroprene Rubber [CR ] Butaclor MA 40S Fast rate of crystallization. Adhesives Used either alone or combined with grades in the medium range of crystallization rate Polychloroprene rubber (CR). Used in adhesives. Possesses fast rate of crystallization. Can be used in alone or combined with medium crystallization CR.