Polyurethanes(PUR) may be thermosetting or thermoplastic, rigid and hard or flexible and soft, solid or cellular with great property variances. Principal applications are in coatings, elastomers and foams.
The Advantages of the Polyurethane
Polyurethanes(PUR) may be thermosetting or thermoplastic, rigid and hard or flexible and soft, solid or cellular with great property variances. Principal applications are in coatings, elastomers and foams.
Polyurethane has excellent abrasion resistance but high hysteresis. Rigid polyurethane foams have become widely used as insulation materials because of their combination of low heat transfer and good cost effectiveness. Use as insulation and other applications are restricted by an upper temperature capability of about 250°F. Polyurethanes do not survive well in direct sunlight or in contact with most organic solvents.
Advantages
High abrasion resistance
Good low temperature capability
Wide molecular structural variability
Ambient curing possible
Comparatively low cost
Disadvantages & Limitations
Poor thermal capability
Poor weatherability
Attacked by most solvents
Utilize toxic isocyanates
Flammable
