We can produce the PU o ring size for standard and custom,A
polyurethane, commonly abbreviated PU, is any polymer consisting of
a chain of organic units joined by urethane (carbamate) links.
Polyurethane polymers are formed through step-growth polymerization
by reacting a monomer containing at least two isocyanate functional
groups with another monomer containing at least two hydroxyl
(alcohol) groups in the presence of a catalyst.
Polyurethane formulations cover an extremely wide range of
stiffness, hardness, and densities. These materials include:
Low-density flexible foam used in upholstery and bedding
Low-density rigid foam used for thermal insulation and RTM cores
Soft solid elastomers used for gel pads and print rollers
Hard solid plastics used as electronic instrument bezels and
Polyurethanes are widely used in high resiliency flexible foam
seating, rigid foam insulation panels, microcellular foam seals and
gaskets, durable elastomeric wheels and tires, automotive
suspension bushings, electrical potting compounds, high performance
adhesives and sealants, Spandex fibers, seals, gaskets, carpet
underlay, and hard plastic parts.
Polyurethane products are often called "urethanes". They should not
be confused with the specific substance urethane, also known as
ethyl carbamate. Polyurethanes are not produced from ethyl
carbamate, nor do they contain it. Millable polyurethane exhibits
excellent abrasion resistance and tensile strength as compared to
other elastomers providing superior performance in hydraulic
applications with high pressures, abrasive contamination and shock
Fluid compatibility is similar to that of nitrile at temperatures
up to approximately 158 °F. At higher temperatures, polyurethane
has a tendency to soften and lose both strength and fluid
resistance advantages over other elastomers.