Polyurethane (AU, EU)

Polyurethane(PU,AU,EU)

The millable Polyurethane rubbers are distinguished into two types;one is polyester urethane(AU),the other is polyether urethane(EU).AU type urethanes have outstanding oil,fuel and solvent resistance but can be attacked by hydrolysis,EU type urethanes are not attacked by hydrolysis and still offer a fuel and oil resistance comparable to low ACN(18-22%ACN)Nitriles or HNBRs.Any type polyurethane has excellent wear resistance,high tensile strength and high elasticity in comparison with any other elastomers.We also can offer any type thermoplastic urethane(TPU)

Cure system-Sulfur-Cured

Standard PU compounds are peroxide-cured.

Other Common Variations

●Polyurethane usually is applied in mechanical industry,especially in the place where material must have higher wear resistance and higher strength.

●In some applying enviroment,moisture condensing will happen on the surface of rubber seal ,and this will cause hydrolysis of AU so choosing EU is better.But EU does not resist oil very well,thus higher aniline point oil must be used for lubricant application.

●Appling in hydraulic system,TPU will be better than millable Polyurethane

Performs Well In…

●Aliphatic hydrocarbon

●Mineral oil and grease

●Silicone oil and grease

●Ozone

●Water up to 50℃(EU type)

Doesnt Perform Well In…

●Alcohols

●Ketones

●Esters

●Acids

●Glycols

●Alkalis,amines

●Hot water and sream

General Information

ASTM D1418 Designation

AU,EU

ISO/DIN1629 Designation

AU,EU

ASTM D200/SAE J 200 Codes

BG

Standard Color(S)

Black

Hardness Range

60 to 93 Shore A

Relative Cost

Medium High

Service Temperatures

Standard Low Temperature

—40℃
—40℉

Standard high Temperature

80℃
176℉

Special Compound Low Temperature

—55℃
—67℉

Special Compound High Temperature

100℃
212℉