WEBSOLUTIOW RUBBER-COVERED ROLLS - Maxcess

1 Fax this page with your orderFax: 1-920-725-9992 Prices are Neenah, WI. Prices subject to change without notice. Delivery from stock based on priorcommitments. This revision effective 7/01/00. 2000 Webex, Inc. All rights ROLLSE lastomerSelection GuideNEOPRENE: Neoprene is considered a good choice for general purpose applications. It has good mechanicalproperties, good chemical resistance and high is a workhorse in the industry. It is used on niprolls, pull ROLLS , feed ROLLS and in flexo and gravure : Also known as NBR or Buna-N, Nitrile is the most commonly used elastomer in the industry. It has good resistance to oils, chemicals and water. Nitrile is also a workhorse covering with applications as nip ROLLS ,pull ROLLS and ROLLS in printing applications. CarboxilatedNitrile is a modified Nitrile rubber, possessing most of the properties of Nitrile along with outstanding abrasionresistance and other physical characteristics, includingtensile strength.

2 Nitrile/PVC blends are also very popular in the web converting industry. The addition of PVCenhances the physical properties, abrasion resistance,strength, chemical and ozone resistance of :Urethane rubber is available in two basic chemical types, polyester and polyether. Polyesterurethane is a tough elastomer with good chemical and solvent resistance while polyethers work better inapplications that come in contact with water. Urethane is typically used in applications where toughness, wearresistance and cut resistance are desired. Urethanegenerally has high-friction characteristics making it a favorite for pull ROLLS . SILICONE:Silicone rubber is known for two mainattributes, high temperature (500 F) capability andimproved release characteristics. Silicone is a moreexpensive covering but along with heat resistance andrelease it has good chemical resistance and excellent ozone resistance.

3 Silicone has generally weak physicalcharacteristics but is widely applied in situations where its temperature and release characteristics are :Sometimes called EPT, EPDM consists mostly ofEthylene and Propylene. It has excellent ozone resistanceand chemical resistance, especially with polar solvents such as keytones. EPDM is also heat resistant to 350 F. It is typically used where its chemical and temperaturecapabilities are required such as coating :Hypalon has good physical characteristics,good chemical resistance, excellent ozone resistance andgood temperature (350 F) capability. Hypalon is ideal formany roller applications and is a favorite as a covering for nip :Viton is known for its excellent chemicalresistance and high temperature (500 F) capability. Viton is very expensive so its applications are limited to extremecases where other compounds fail and the high price canbe : Any of the ROLLS in the Idler Master Catalog can be RUBBER-COVERED to meet appropriate selection of a rubber cover is important to the success of manyprocess applications.

4 The following is a summary guide to a few of the most popularchoices of rubber elastomers used in the web converting industry. For specific strengthsand weaknesses of each elastomer, refer to the polymer properties to specify the right elastomerUse this elastomer chart to help determine which rubbercompound is best suited to yourparticular situation. If in doubt,call us. We ll help you determinethe best possible covering basedon the web handling parametersyou have to share with to specify the right groovedrubber rollThe Idler Master Catalogpresents four different grooveconfigurations for the standardrubber-covered idlers. Otheroptions are also available,including additional groovevariations and non-groovedesigns. To specify the bestpossible groove or rubber rolldesign, call us. Chances arewe ve already designed arubber-covered roll for anapplication similar to RATINGE xcellentAbove AverageAverageFairPoorNEOPRENENITRILECAR BOXYLATED NITRILEPOLYURETHANESILICONEEPDMHYPALONVI TONH ardness RangeTensile StrengthModulusElongation at BreakTear StrengthCut ResistanceResistance to Compression SetResistance to Permanent SetResilienceResilience to Heat Build-upResistance to AbrasionOzone ResistanceHydrolytic StabilityDielectric StrengthRelease CharacteristicsMaximum Service Temperature ( F)Acids(Mineral) Nitric, SulfuricHydrochloric, Phosphoric(Organic)

5 Acetic, BoricCausticsSodium Hydroxide, Calcium HydroxideAliphatic HydrocarbonsKerosene, Gasoline, Hexane, Naphtha,Mineral Spirits, Most Offset/LetterpressPrinting Inks, Many lubricants andgreasesAromatic HydrocarbonsToluol or Toluene, Xylol or XyleneChlorinated HydrocarbonsMethylene Chloride, 1, 1, 1-Trichloroethylene, PerchloroethyleneEstersEthyl Acetate, Dioctyl Phthalate,Tricresyl, PhosphateAlcoholsMethanol, Ethanol, Isopropyl AlcoholWaterGlycolsEthylene Glycol, GlycerineKetonesMethyl Ethyl Ketone (MEK), MethylIsobutyl Ketone20-95 20-100 45-95 40-95 30-90 25-95 30-90 55-90250250275212500350300500