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-220 S70 FDA Silicone (VMQ) 70 Duro O-Ring


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Min:  3
  • Model: S70220
  • 94 in Stock
  • 1-3/8"ID X 1-5/8"OD X 1/8"CS
  • Actual: 1.359"ID X 0.139"CS
  • Metric: 34.52mm ID X 3.53mm CS
  • PDF Data Sheets

1-3/8"ID X 1-5/8"OD X 1/8"CS

Silicone O-Rings (VMQ) Duro 70 - Brick Red - FDA:

The term silicone covers a large group of materials in which vinyl-methyl-silicone (VMQ) is often the central ingredient. Silicone elastomers as a group have relatively low tensile strength, poor tear and wear resistance. However, they have many useful properties as well. Silicone has a good heat resistance, good cold flexibility, and good ozone and weather resistance as well as good insulating and physiologically neutral properties.

Operating temperature:

  • Heat resistance-Up to approximately 400°F (204°C)
  • Cold flexibility-Down to approximately –75°F (–59°C)

Chemical Resistance:

  • Engine and transmission oil (e.g.: ASTM oil No.1)
  • Animal and vegetable oil and grease
  • Brake fluid (non-petroleum base)
  • Fire-resistant hydraulic fluid, HFD-R and HFD-S
  • High molecular weight chlorinated aromatic hydrocarbons (including flame-resistant insulators, and coolant for transformers)
  • Beer, Coffee, Whiskey and Milk
  • Moderate water resistance
  • Diluted salt solutions
  • Sea Water
  • Ozone, aging and weather resistant.

Not Compatible with:

  • Silicone Grease and Oils
  • Super-heated water steam over 250°F (121°C)
  • Acids and alkalis
  • Low molecular weight chlorinated hydrocarbons (trichloroethylene)
  • Chlorine wet or dry
  • Aromatic mineral oil
  • Transmission Fluid
  • Hydrocarbon based fuels
  • Diesel Oil
  • Aromatic hydrocarbons (benzene, toluene).
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Stock O-Rings in over 20 different compounds and durometers the following six are the standard rubber materials in a range of durometers (Shore A) hardness to satisfy practically any service condition:

Viton® O-Rings / FKM: Fluorocarbon (Viton®) exhibits exceptional resistance to chemicals, oils, temperature extremes (-13°F to +446°F), low compression set, low gas permeability and excellent aging characteristics. Applications include: aircraft engines, automotive fuel handling systems, and chemical processing industries. FKM is also suitable for high vacuum applications. It is not recommended for exposure to ketones, alkalis, and Skydrol® fluids. Custom compounds are available with improved chemical and low temperature resistance.
AS-568 Viton® O-Rings | Metric Viton® O-Rings

Buna-N O-Rings / Nitrile O-Rings / NBR: Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-40°F to +257°F) and one of the best performance-to-cost values. It's an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F.
AS-568 Buna-N O-Rings | Metric Buna-N O-Rings

Ethylene-Propylene / EPDM O-Rings: EPDM has outstanding resistance to heat, water and steam, alkali, mild acidic and oxygenated solvents, ozone, and sunlight (-40ºF to +275ºF); but it is not recommended for gasoline, petroleum oil and grease, and hydrocarbon environments. This popular rubber compound is usually the first choice for low torque drive belt applications.
AS-568 EPDM O-Rings | Metric EPDM O-Rings

Fluorosilicone O-Rings / FVMQ: Fluorosilicone (-75º to +400ºF) combines the good high and low temperature stability of silicones with the fuel, oil, and solvent resistance of fluorocarbons. FVMQ is unparalleled for aerospace fuel systems, auto fuel emission control systems and to meet or exceed government, military, aerospace, automotive, industrial and commercial specifications. However, due to relatively low tear strength, high friction and limited abrasion resistance of these materials, they are generally not used in dynamic applications. They are also not recommended for exposure to brake fluids, hydrazine, or ketones.
AS-568 Fluorosilicone O-Rings | Metric Fluorosilicone O-Rings

Silicone O-Rings / VMQ: In the Silicone family, you will find compounds which are superior as static seals in extreme temperature conditions. Standard compounds handle operating temperatures -85º to +400ºF. Silicone compounds are popular in food and medical applications because they are very clean and do not impart odor or taste. Special Phenyl silicones can be used down to -148°F.
AS-568 Silicone O-Rings | Metric Silicone O-Rings

Neoprene® O-Rings / CR: Neoprene (-40º to +250ºF) is reasonably priced and features good resistance to petroleum oils, ozone, sunlight and oxygen aging, relatively low compression set, good resilience and outstanding physical toughness. It is the preferred sealing material for the refrigeration industry because of its resistance to ammonia and Freon®.
AS-568 Neoprene® O-Rings