Lumaco supplies a variety of seat and "O" ring materials for their valves. Request the material desired on the original equipment only Viton® has an up charge. (see price list) Available Material for Each Valve Minidisc & Doubledisc Seat Teflon, Silicone, Buna, EPDM, Viton® "O" rings Buna, Viton® EPDM, Silicone, Calrez® (special order) Betterfly Seat Silicone,EPDM, Viton®, Teflon coated Viton® Check Seat & Body "O" rings EPDM, Viton® ITC Plug Bushings Teflon "O" rings Silicone TEFLON: Most commonly used seat material for food application. Has extensive chemical and temperature resistance. Not suitable for great temperature fluctuations: Teflon tends to coldflow and does not return to its original shape. Can be used as a coating on other elastomers. Useful temperature range : 30°F to 400°F BUNA N: Nitrile compound provides an elastic seat that makes for leak free, easy handling of valve. Least expensive elastomer. Good chemical resistance: excellent for use with petroleum solvents, gasoline, alcohol, etc... Recommended lubricant : silicone Useful temperature range : 40°F to 225°F SILICONE: Very good seat material, very elastic selflubricating provides a tight easy seal, reducing torque needed to close the valves. Sensitive to certain chemicals: do not use with solvents, petroleum products, etc. (check with us for nonfood usage) Useful temperature range : 85°F to 450°F EPDM: Good for steam and hot water to 350°F Good resistance to mild acids,

Seat & _O_ Ring Materials

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Seat and Oring Materials

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08/05/2015 Seat&"O"RingMaterials

http://www.lumaco.com/oringmat.htm 1/2

Lumacosuppliesavarietyofseatand"O"ringmaterialsfortheirvalves.RequestthematerialdesiredontheoriginalequipmentonlyVitonhasanupcharge.(seepricelist)

AvailableMaterialforEachValveMinidisc&Doubledisc

Seat Teflon,Silicone,Buna,EPDM,Viton

"O"rings Buna,VitonEPDM,Silicone,Calrez(specialorder)

Betterfly Seat Silicone,EPDM,Viton,TefloncoatedViton

Check Seat&Body"O"rings

EPDM,Viton

ITCPlug Bushings Teflon"O"rings Silicone

TEFLON:

Mostcommonlyusedseatmaterialforfoodapplication.Hasextensivechemicalandtemperatureresistance.Notsuitableforgreattemperaturefluctuations:Teflontendstocoldflowanddoesnotreturntoitsoriginalshape.Canbeusedasacoatingonotherelastomers.Usefultemperaturerange:30Fto400F

BUNAN:

Nitrilecompoundprovidesanelasticseatthatmakesforleakfree,easyhandlingofvalve.Leastexpensiveelastomer.Goodchemicalresistance:excellentforusewithpetroleumsolvents,gasoline,alcohol,etc...Recommendedlubricant:siliconeUsefultemperaturerange:40Fto225F

SILICONE:

Verygoodseatmaterial,veryelasticselflubricatingprovidesatighteasyseal,reducingtorqueneededtoclosethevalves.Sensitivetocertainchemicals:donotusewithsolvents,petroleumproducts,etc.(checkwithusfornonfoodusage)Usefultemperaturerange:85Fto450F

EPDM:

Goodforsteamandhotwaterto350FGoodresistancetomildacids,
08/05/2015 Seat&"O"RingMaterials

http://www.lumaco.com/oringmat.htm 2/2

dilutealkalis,siliconeoilsandgreases,ketonesandalcohol.Avoiduseforpetroleumoilsordiesterbaselubricants.Usefultemperaturerange:65Fto300F

VITON:

Bothextremetemperatureandgoodchemicalresistance.UsefulathightemperaturewhenbunaorEPDMisnotsuitable.Recommendedlubricant:siliconeUsefultemperaturerange:31Fto400F

VitonandCalrezareregisteredtrademarksofDuPontDowElastomers.

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