Eastman CAB-531-1 is a low–molecular weight, mixed cellulose ester with high butyrate content. CAB-531-1 is the ideal resin for coatings that require best-in-class appearance and performance. Pigment orientation, flow, leveling, durability, and gloss are all improved with Eastman CAB-531-1. When combined with thermoplastic acrylic resins, this cellulose acetate butyrate forms durable films with excellent weathering resistance.

CAB-531-1 has better flexibility than lower-butyrate CABs and is compatible with a broader range of solvents and resins. Due to this increased flexibility, CAB-531-1 requires less plasticizer modification. As this cellulose acetate butyrate has a higher viscosity than other Eastman CABs, it is very effective in increasing cold-crack resistance. CAB-531-1 has also been used in nail care applications as a replacement for nitrocellulose due to superior UV stability and product safety since cellulose esters are much less flammable than nitrocellulose.