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

 

Por:

Clecio Mayrink
Editor - Brasil Mergulho

Nascido no Rio de Janeiro, ingressou no mergulho em apneia em 1983 e autônomo em 1986 pela CMAS, participando da primeira turma da PADI no Rio de Janeiro em 1990. É mergulhador Técnico Trimix, Technical Cave Diver, Advanced Cave Sidemount / No Mount IANTD, possuindo mais de 30 anos de experiência em mergulho, fotografia e vídeo subaquático.

Foi membro da expedição de mapeamento da Lagoa Misteriosa em Bonito-MS em 2008, sendo o idealizador do portal Brasil Mergulho criado em 1998 (MTB 0081769/SP) e responsável pelo tema Mergulho no 1° Atlas dos Esportes do Ministérios dos Esportes.

Atuou na produção de diversas matérias e documentários no Brasil e no exterior, sendo uma referência para a mídia, órgãos públicos e diversas entidades internacionais como a ONU e UNESCO, quando o assunto é naufrágio.

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