E. I. DuPont India P. Limited offers Commercial Flexible Sealant. E. I. DuPont India P. Limited products are ISO certified. Commercial Flexible Sealant Commercial Flexible Sealant is durable, flexible and helps to protect against air and water infiltration at critical interface areas, such as window and door installations and other commercial construction applications. This UV resistant, high performance sealant was developed for use in higher design pressure [wind load] applications that are typical in the rugged environment of today`s commercial building construction.