Tipos De Cauchos

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Rubber Materials Characteristics:
Material Advantage ü Excellent resistance to petroleum products ü Excellent compression set ü Resistant to oil, water, and silicone greases, glycol basefluids ü Good abrasion resistance, cold flow, tear resistance ü Good low-temperature characteristics ü Good processing ü Low cost Disadvantage

û Poor resistance to weather aging û Not recommendedfor halogenated hydrocarbons, ketones, ozone
and sunlight

Nitrile (NBR)

û Hardening gradually during continuous high-temperature usage û Lack of exceptional heat

ü Outstanding resistance tothe effects of heat, chemicals, solvents ü Commonly chosen as high temperature replacement for Nitrile or Polyacrylate (ACM) Fluoroelastomer ü Good tensile resistance (VITON) ü Good low compression setü Compatible with wide range of fluids

û Poor low-temperature properties û Limited hot-water resistance and shrinkage û Cost is high

Ethylene propylene Rubber (EPDM)

ü Excellent weatherabilityü Good high and low temperature resistance ü Resistant to ozone, steam, water, alcohols, brake fluids, etc. ü Best overall temperature range of elastomers currently available ü Excellent resistanceto dry heat, low temperature, brake fluids, high aniline point oils ü Good ozone resistance ü Good heat resistance

û Low gas permeability û Poor resistance to petroleum oils, diester lubricants ûNot recommended for some dynamic applications due to poor
tensile strength and tear

Silicone

û Poor in petroleum oils and ketones û Poor dry-running characteristics

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ü Resistance to compression set

SiliconePolytetrafluoroethylene (PTFE)
ü Superior fluid and hear resistance ü Excellent dry-running characteristics ü Low coefficient of friction ü Good resistance to mineral oils, hypoid gear oils E.P. additives, greases,...