O-Ring Fluid Compatibility Guide – Parte 2

O-Ring Material Reference Guide (Fonte: Marco Rubber)

Material Recomended Use Not Recomended For Mechanical Properties
Buna-N  (Nitrile)

Standard: 70 Durometer Black
Temperature Range: -35ºF to 250ºF
Least Expensive / Readily Available

Silicone Greases / Oils
Water
Petroleum Oils / Fuels
Ethylene Glycol Fluids
Keytones (MEK)
Halogenated Hydrocarbons
Auto / Aircraft Brake Fluids
Strong Acids
Sunlight, Ozone,  Weathering
Good Wear Resistance
Good Compression Set Resistance
Good Short-Term Resilience
Good Permeation Resistance
Viton®  (Fluorocarbon Type A)

Standard: 75 Durometer Black
Temperature Range: -15ºF to 400ºF

Vacuum
Most Acids / Chemicals
Halogenated Hydrocarbons
Di-Ester Lubricants
Petroleum Oils / Fuels
Silicone Oils / Greases
Keytones (MEK)
Auto / Aircraft Brake Fluids
Amines (Ammonia)
Acetone, Skydrol, Ethyl Accetate
Hot Water and Steam
Low Molecular Esters and Ethers
Good Wear Resistance
Excellent Comp. Set Resistance
Moderate Short-Term Resilience
Excellent Permeation Resistance
Silicone

Standard: 70 Durometer Orange
Temperature Range: -65ºF to 450ºF

Dry Heat
Wide Temperature Range
Sunlight, Ozone,  Weathering
Odorless and Non-Toxic
Keytones (MEK)
Acids
Silicone Oils
Brake Fluids
Poor Wear Resistance
Excellent Comp. Set Resistance
Poor Short-Term Resilience
Excellent Permeation Resistance
EPDM  (Ethylene Propylene)

Standard: 70 Durometer Black
Temperature Range: -60ºF to 250ºF

Sunlight, Ozone,  Weathering
Hot Water and Steam
Auto / Aircraft Brake Fluids
Some Acids ans Bases
Keytones ans Alcohols
Plumbing
Petroleum Oils
Fuels
Good Wear Resistance
Good Comp. Set Resistance
Moderate Short-Term Resilience
Good Permeation Resistance
 
Material Recomended Use Not Recomended For Mechanical Properties
Chemraz® / Kalrez® / Simriz®
(Perfluoroelastomer)Various Compounds
Designed for Specific Applications
Temperature Range: -10ºF to 615ºF
High Temperature Resistance
Excellent Chemical Resistance
Low Out Gassing
Chlorine Wet/Dry
Petroleum Oil
Chlorinated Hydrocarbons
Molten metals
Gaseous Alkali Metals
Halogenated Freons/Fluids
Uranium Hexafluoride
Good Wear Resistance
Good Comp. Set Resistance
Moderate Short-Term Resilience
Good Permeation Resistance
Neoprene® (Chloroprene)

Standard: 70 Durometer Black
Temperature Range: -35ºF to 250ºF

Refrigerants (Freon)
Ammonia
Some Petrolium Oils
Dilute Acids
Silicone ester Lubricants
Keytones (MEK)
Gasoline
Auto / Aircraft Brake Fluids
Good Wear Resistance
Moderate Comp. Set Resistance
Moderate Short-Term Resilience
Good Permeation Resistance
Urethane

Standard: 90 Durometer Translucent
Temperature Range: -65ºF to 200ºF

Drive Belts
Some Petroleum Oils
Some Hydrocarbon Fuels
Oxygen / Ozone
Keytones (MEK)
Acids
Auto / Aircraft Brake Fluids
Chlorinated Hydrocarbons
Water
Excelent Wear Resistance
Poor Comp. Set Resistance
Excelent Short-Term Resilience
Fluorosilicone

Standard: 70 Durometer Blue
Temperature Range: -80ºF to 450ºF

Jet Fuel
Dry Heat
Wide Temperature Range
Some Petroleum Oils
Clorinated Solvents
Keytones (MEK)
Phosphate Esters
Some Acids
Auto / Aircraft Brake Fluids
Amines (Ammonia)
Poor Wear Resistance
ModerateComp. Set Resistance
Moderate Short-Term Resilience
Poor Permeation Resistance
Teflon Encapsulated

O-Ring Covered with Teflon Tube
Usually Silicone or Viton®

Depends on O-Ring Core
Chemical Resistance
Heat Resistance
Depends on O-Ring Core Good Wear Resistance
Good  Short-Term Resilience
Good Permeation Resistance
Teflon®

Standard: Non-Elastic White
Temperature Range: -250ºF to 450ºF

Chemical Resistance
Fuel Resistance
Low Coefficient of Friction
Non-Elastic Good Wear Resistance
Low Coefficient of Friction

 

Clecio Mayrink
Nascido no Rio de Janeiro, ingressou no mergulho em 1987 pela CMAS e realizou Dive Master em 1990 pela PADI. Hoje é mergulhador Técnico Trimix (Mergulho Profundo) e de cavernas (Technical Cave Diver e Advanced Cave Side Mount / No Mount). É juiz internacional de apneia pela AIDA e foi membro da expedição de mapeamento da Lagoa Misteriosa em Bonito-MS em 2008. Produziu documentários sobre as Bahamas, Bonaire, Galápagos e Laje de Santos, visitando mais de 30 países. Foi o idealizador do site Brasil Mergulho criado em 1998 (MTB 0081769/SP), atuou como consultor para a ONU, UNESCO, além de diversos órgãos públicos no Brasil.