UL Prospector

Baybond® PU 401 A

Covestro makes their documentation available in the regions indicated below:

Baybond® PU 401 A has anionic, non-ionic polyester urethane polymer, used as the film-forming component in glass fiber sizes. Commonly used as the film-forming component in glass fiber sizing. Glass fiber sizes based on its polyurethane dispersion have excellent film-forming properties and very good adhesion. As with any product, use of Baybond® PU 401 A polyurethane dispersion in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.


Covestro manufactures adhesive raw materials for use in the production of contact and heat-activated adhesives, as well as reactive and hot-melt adhesives for the transportation, furniture, footwear, packaging, and construction markets. Bayer offers a comprehensive range based on polyurethane and polychloroprene, with specialty raw materials that offer UV light and weather resistance.

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