Bayhydur^® is a hydrophilically-modified polyisocyanate hardener for waterborne two-component (2K) polyurethane (PUR) systems.  Applications for Bayhydur products include adhesives, automotive coatings, parquet coatings, OEM primer surfacers, plastics coatings, industrial coatings, glass coatings, can coatings, coil coatings and pigmented coatings. Bayhydur water-dispersible polyisocyanates include aliphatic and blocked isocyanate grades.

Click the literature icon link  next to any Bayhydur grade in the listing below or click here to find the product index for Bayer's aliphatic isocyanates. Tables in the indexes let you compare Bayhydur and other isocyanate products by their chemistry and typical properties at a glance. (registration required)

To find links to more information about the benefits and uses of Bayhydur products with polyurethane dispersions, visit the Bayer Polyurethane Dispersions Center.

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3 Product Grade(s):
= data sheet(s) = other literature
	BAYHYDUR 302
	water-dispersible polyisocyanate based on hexamethylene diisocyanate (HDI); hardener in waterborne 2K-PUR systems for adhesives and automotive refinish, plastics and industrial coatings; outstanding weather stability and gloss retention, non-yellowing; NCO content 17.3% ± 0.5; solids 99.8% minimum; viscosity 2,300 ± 700 mPa­·s @ 25°C
	BAYHYDUR BL 5335
	water-dispersed aliphatic polyisocyanate resin based on dicyclohexylmethane diisocyanate (H12MDI); used as hardener component for 1-K waterborne components; flow time 15-30 sec @23°C; non-volatile content 34-36%; pH value 4.5-6.0; blocked NCO content 2.5%; equivalent wt. avg. 1680 as supplied; specific gravity 1l.04 @25°C;
	BAYHYDUR XP 7148
	water-dispersible polyisocyanate based on hexamethylene diisocyanate (HDI); hardener in waterborne 2K-PUR systems for adhesives and industrial finishing, special substrates and wood furniture coatings; good gloss, chemical resistance and flexibility; NCO content ca. 14.4%; solids 100%; viscosity ca. 3,000 mPa­·s @ 25°C