Polyurethane (PU, AU)
Selection Guide
Polyurethane is an organic polymer formed by reacting a polyol alcohol with a cyanate in the presence of suitable catalysts and additives. The result of this reaction is a thermoplastic elastomer, and therefore demonstrates drastically different mechanical properties than elastomeric rubbers. For example, Polyurethane O-rings, gaskets, & custom molded parts generally have two or three times greater tensile strength and wear resistance than Nitrile and comparable polymers. Polyurethane O-rings, gaskets, & custom molded parts also provide excellent permeation resistance when compared to most rubbers. However, the plastic material becomes brittle at low temperatures and will begin to warp and flow at high temperatures, making polyurethane O-rings, gaskets, & custom molded parts not suitable for some applications. Polyurethane O-rings, gaskets, & custom molded parts are most commonly used in hydraulic systems and other applications where high pressure and wear resistance are critical, but extreme temperatures are not a factor.
Common names include: PU (Polyurethane), Urethane, AU, EU Trade Names: Parker Resilon®, Adiprene®, Millathane®, Vibrathane®
Features of Polyurethane
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Polyurethane O-rings, gaskets, & custom molded parts have excellent tear and abrasion resistance
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Polyurethane O-rings, gaskets, & custom molded parts have good resistance to hydraulic oil and gasoline
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Polyurethane O-rings, gaskets, & custom molded parts have resistance to pure aliphatic hydrocarbons (propane, butane, fuel)
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Polyurethane O-rings, gaskets, & custom molded parts are resistant to mineral and silicone oils and greases
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Polyurethane O-rings, gaskets, & custom molded parts are resistant to water, oxygen, ozone and aging
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Available in multiple compounds to meet performance and cost requirements
Limitations of Polyurethane
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Polyurethane O-rings, gaskets, & custom molded parts have poor resistance to acids, ketones, esters, ethers, alcohols, glycols
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Polyurethane O-rings, gaskets, & custom molded parts are not compatible with hot water, steam, alkalis and amines
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Polyurethane O-rings, gaskets, & custom molded parts have a typical Service Temperature Range of (varies with application): -65°F to 225°F (-54°C to 107° C)
Please consult a Canyon Components Engineer about your specific application and we will use our decades of experience to formulate a solution that fits your need.
COMPARABLE MATERIALS
COMPOUND
Canyon™ PU
Color
Shore A
Temp (°C)
Description
Parker®
PU70BK00
Black
70
-55 to +110
Black General Purpose
P0642-70
PO642
PU70TR00
Clear
70
-35 to +85
Translucent General purpose Rubber type PU
PU70TY01
Yellow-Clear
70
-55 to +125
Translucent thermoplastics high performance
PU90TY00
Yellow-Clear
90
-35 to +85
High Durometer for high pressures and high abrasion resitsance applications, rubber type PU
PU90TY01
Yellow-Clear
90
-55 to +125
High Durometer High performance for aggressive dynamic and high rpessure applications, Thermoplastic type.
PU70WH02
White
70
FDA compliant for Pharma ceutical and some food applications
PU70WH09
White
70
FDA and USDA 3A compliant for Dairy and food applications
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