Acrotech, Inc.

Custom Urethane Manufacturing

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    • k-prene-urethaneK•Prene®Polyurethane
      • Round Rods
      • Precision Cast Sheets
      • Square & Rectangle Bars
      • Versa Rolls™For wheels, casters, rollers, sheaves
      • Metric Sized Products
      • Solid Urethane Balls
      • Tubes & Springs
      • Additional Tubes/Spring Sizes
    • acrotech-metalworkingMetalworkingApplications
      • Large Radius Forming
      • K•Prene Press Brake Dies
      • Acroform™ InsertsSimple & economical
      • Acro-hyde™ Urethane FilmFor Press Brake Forming
      • SurStrip™ Punch Strippers
      • Wiedeman® Punch Strippers
      • Piranha® Punch Strippers
      • Di-Acro Punch Strippers
    • acrotech-industrialIndustrial ProductsAPPLICATIONS
      • Washers, Seals & Gaskets
      • Slick Strip™ Tape
      • Bumpers
      • Metal Backed Sheets
      • K-20 Adhesive
      • Tool Holsters
      • FDA Approved Polyurethane
      • Custom Bumpers
      • Urethane Tool Holster and Hammer
    • drive-wheelsWoodworkingAPPLICATIONS
      • Urethane for the Wood Industry
      • Powerfeed Replacement Tires
      • Power Feed Tires and Reuseable Hubs
      • OEM Replacement/Recovering
      • OEM Replacement Parts
    • acrotech-automotiveAutomotiveAPPLICATIONS
      • Automotive ApplicationsSpring Rubbers
      • Automotive High PerformanceIncluding Motorcycle and snowmobiles
  • Roll Bending Machines
    • small-model-roll-bending3Benefits & Custom RollingVarious Models Available
    • LD and HD Models
    • Models 1212, 1618, 1824
    • Model V-1006
    • Roll Bending Machine Restoration
    • Art of Bending
  • Custom Urethane
    • custom-molding1Custom MoldingAPPLICATIONS
      • Industries Served
      • Roller Manufacturing
      • Roller Recovery Service
      • Custom Machining
      • Custom Urethane Colors
  • Custom Metal Rolling
  • Request A Catalog
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  • Compression & Deflection Charts
  • Shape Factor & Modulus of Elasticity
  • Acrotech SDS Data Sheets
  • Environmental Properties of K•Prene®
  • Oil, Chemical & Solvent Resistence
  • Additional K•Prene Properties
  • Application Chart of K•Prene
  • Machining of K•Prene
  • Physical Properties of K•Prene®
  • Metal Forming Applications Using Urethane
  • Urethane Compared with Natural & Synthetic Rubbers

Environmental Properties of K•Prene®

The superior mechanical properties of K•Prene® urethane are not greatly affected by many environmental influences. In comparison with other elastomers, K•Prene® shows outstanding performance over a wide temperature range. K•Prene® exhibits excellent resistance to most common lubricants and aliphatic solvents, and has outstanding water resistance. This section covers the effects upon K•Prene® of normally encountered environmental influences.

Cold Resistance

K•Prene® remains flexible at very low temperatures and possesses outstanding resistance to thermal shock. Standard grades remain  flexible at temperatures below -80°F., although stiffening does occur as the temperature is reduced below 0°F. Special compositions can be formulated which retain a degree of flexibility at temperatures as low as -125°F.

Heat Resistance

K•Prene® can be used for service applications at temperatures up to 200-250°F., with only a minor decrease in physical properties as tested at ambient temperatures (75°F.). Use of K•Prene® above 250°F., even if only intermittent, is not recommended and each contemplated use at 200°F., or above should be evaluated individually beforehand.

Resistance to Aging

Properly compounded products of K•Prene® are not affected by the passage of time under static ambient temperature conditions. This statement can be substantiated by data on specimens stored for periods of six years or more. Prolonged use in normal service is not a problem, nor is there any indication of shelf aging.

However, the introduction of certain other environmental influences combined with the passage of time can accelerate deterioration. For instance, chemical agents or dynamic forces acting upon a K•Prene® product over a period of time can intensify the aging process. Normally in multiple attacks such as these the effects strictly due to aging may be so masked as to become unrecognizable.

Weatherability and Color Stability

Prolonged exposure to ultraviolet light will gradually degrade physical properties of K•Prene®. For applications in which long term UV exposure is required, special formulations are available.

Outgassing

Products made from K•Prene® are very stable under high vacuum conditions. They show extremely low weight losses in standard outgassing tests. This property, combined with excellent low temperature performance, suggests logical applications in the aerospace field.

Flame Resistance

All K•Prene® grades are either extremely slow burning or self-extinguishing as tested in accordance with ASTM 0635. It is possible to obtain special compounds containing flame retardants which are completely non burning under test conditions.

Mold, Mildew, Fungus Resistance

Standard compounds of K•Prene® do not support fungus and are generally resistant to fungus attack and mildew growth. Samples buried for one year in moist inoculated soil showed no evidence whatever of attack, and the vulcanizate properties were essentially unchanged.

Oxygen and Ozone Resistance

K•Prene® resists oxidation and is immune to the powerfully destructive attack of ozone. Oxygen and ozone in atmospheric concentrations have no observable effect on K•Prene®. In one test specific, K•Prene® grades were exposed to three parts per million ozone under 20% static strain conditions for 500 hours with no signs of surface cracking or crazing. It is this property in combination with insulating electrical properties that makes K•Prene® ideal for use around electrical equipment where ozone concentrations are highest. Likewise, stress-strain properties of K•Prene® are little changed after oxygen exposure for four weeks at 158°F., under 300 PSI oxygen pressure.

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News + Videos

  • Easy to Use Urethane Punch Strippers with SurStrip™ December 7, 2020
  • Urethane Press Brake V-Dies Bend Metal with No Marks November 10, 2020
  • Custom V-1006 Sheet Metal Rolling Machine August 11, 2020

(800) 345-0583

K•Prene® Urethane products & services for…
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Acrotech, Inc.

980 West Lakewood Avenue
P.O. Box 466
Lake City, MN 55041
Toll Free: (800) 345-0583
Fax: (651) 345-3759

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