Predominantly linear hydroxyl polyurethane. Desmocoll® 621/1 is a flexible polyurethane with a high rate of crystallization and low thermoplasticity. It has good adhesion on many flexible PVC substrates. Desmocoll® 621/1 is characterized in particular by its long tack live after thermal activation. Properties / Applications: Desmocoll® 621/1 is suitable for the formulation of adhesives for use on various materials, e.g. leather, rubber, textiles, wood, various plastics (including polyurethane elastomers), plastic films and aluminum foils. Information provided by Covestro |