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Fluorosilicone vs Buna-N (NBR) for O-Rings and Seals

Fluorosilicone (FVMQ, FSIL)

Buna-N (NBR, Nitrile, Buna)

Description
 Both materials are well suited for use in the -35 to 125°C range. Fluorosilicone has an advantage in lower temperatures and Fluorosilicone has an advantage in higher temperatures. Marco offers specific compound formulations extending these ranges even futher as can be seen in the following compound comparison chart. When comparing these materials with respect to electrical current resistance, Fluorosilicone has a significant advantage. The differences in compression set resistence show that Buna-N has a slight advantage. Additionally, Buna-N has a slight advantage when considering wear resistance. Also, Fluorosilicone has a slight advantage when comparing heat stability. Furthermore, Buna-N has a slight advantage when comparing short term resilience. Finally, Buna-N has a significant advantage when evaluating differences in permeation resilience. Both materials are resistant to common fuels, vegetable oils, diluted alkalies and silicone oils, with Fluorosilicone having specific resistences to ozone, compression set, aromatic hydrocarbons, chlorinated hydrocarbons, aging, weathering and sunlight, oxidizing chemicals, animal oils, chlorinated solvents, diester oils, aliphatic fluorocarbons, aromatic fluorocarbons, toluene, benzene, jet fuels, phosphate esters, dry heat, wide temperature range, ammonia, some acids and some petroleum oils. Buna-N has specific resistence to acids, solvents, mineral oils, greases, aliphatic hydrocarbons, hydraulic fluids, water, petroleum oils, ethylene glycol fluids, di-ester lubricants and alcohols.
Compounds
Marco
Compound
Number		DatasheetHardness
(Shore A)		ColorLow TempHigh TempFeatures
Compound: B1000Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: Lowest cost highest inventory general purpose commodity NBR compound. Compare to Parker N1470-70 and N0674-70 and Parco 4200-70 and 4900-70. Available in nearly any color and hardness.
Compound: B1001Datasheet: View DatasheetHardness: 90Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: General purpose, higher pressure applications. Compare to Parker N0552-90 and N1490-90 and Parco 4200-90 and 4900-90.
Compound: B1002Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: FDA compliant per 21 CFR 177.2600. Compare to Parker N0508-75 and N1069-70.
Compound: B1005Datasheet: View DatasheetHardness: 90Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: FDA compliant, higher hardness.
Compound: B1006Datasheet: View DatasheetHardness: 50Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: General purpose, lower hardness for lower closure force applications. FDA compliant and alternative colors available. Compare to Parker N0299-50.
Compound: B1010Datasheet: View DatasheetHardness: 80Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
225 °F
(110 °C)
Description: General purpose, higher hardness. Compare to Parker N0368-80.
Compound: B1011Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: Internally lubricated with PTFE to reduce friction. Silicone oil and Moly (MOS2) internal lubricants available. Alternative hardness and colors also available.
Compound: B1017Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-35 °F
(-40 °C)
High Temp:
250 °F
(125 °C)
Description: UL 157 listed for several approved uses.
Compound: B1039Datasheet: View DatasheetHardness: 70Color: WhiteLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description:
Compound: B1058Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: NSF 61 certified for drinking water applications.
Compound: B1063Datasheet: View DatasheetHardness: 95Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: Very high hardness for extreme pressure applications.
Compound: B1083Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-65 °F
(-55 °C)
High Temp:
275 °F
(135 °C)
Description: Improved lower and higher temperature resistance and improved oil resistance at higher temperature. Compare to Parker N0794-75 and M83461 and Parco 4367-70.
Compound: B1105Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: Metal detectable for contamination detection sensors. FDA compliant per 21 CFR 177.2600. Formulated for food contact and life science applications. Additional colors available.
Compound: B1115Datasheet: View DatasheetHardness: 70Color: BlueLow Temp:
-40 °F
(-40 °C)
High Temp:
250 °F
(125 °C)
Description:
Compound: B1122Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-30 °F
(-35 °C)
High Temp:
250 °F
(125 °C)
Description: NSF 51 certified for food contact.
Compound: M1000Datasheet: View DatasheetHardness: 70Color: BlackLow Temp:
-65 °F
(-55 °C)
High Temp:
275 °F
(135 °C)
Description: Mil Spec (Military specification) AMS-P-25732, MS28775-### per MIL-P-25732C-(1).
Compound: M1001Datasheet: View DatasheetHardness: 75Color: BlackLow Temp:
-65 °F
(-55 °C)
High Temp:
275 °F
(135 °C)
Description: Mil Spec (Military specification) AMS-P-83461, M83461/1-### per MIL-P-83461B#3. Improved low temperature resistance and hydraulic fluid resistance.
Compound: M1002Datasheet: View DatasheetHardness: 65Color: BlackLow Temp:
-65 °F
(-55 °C)
High Temp:
250 °F
(125 °C)
Description: Mil Spec (Military specification) MS29513-###, MS29512-##, AMS-P-5315B.
Compound: M1004Datasheet: View DatasheetHardness: 90Color: BlackLow Temp:
-65 °F
(-55 °C)
High Temp:
275 °F
(135 °C)
Description: Mil Spec (Military specification) MS28778, AMS-P-5510C.
Compound: M1005Datasheet: View DatasheetHardness: 65Color: BlackLow Temp:
-70 °F
(-60 °C)
High Temp:
200 °F
(95 °C)
Description: Mil Spec (Military specification) AMS7271, AS3578.
Compound: F1001Datasheet: View DatasheetHardness: 70Color: BlueLow Temp:
-100 °F
(-75 °C)
High Temp:
350 °F
(180 °C)
Description: Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/1-### per Mil-R-25988 CL-1 GR-70, jet fuel resistance
Compound: F1002Datasheet: View DatasheetHardness: 75Color: BlueLow Temp:
-80 °F
(-65 °C)
High Temp:
350 °F
(180 °C)
Description: Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/2, jet fuel resistance
Compound: F1003Datasheet: View DatasheetHardness: 60Color: BlueLow Temp:
-100 °F
(-75 °C)
High Temp:
350 °F
(180 °C)
Description: Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/3, jet fuel resistance
Compound: F1006Datasheet: View DatasheetHardness: 40Color: BlueLow Temp:
-100 °F
(-75 °C)
High Temp:
350 °F
(180 °C)
Description: Jet fuel resistance
Temperature Range Comparison
Box: Base Material Family Range
Whiskers: Specialty Compounds
General Information
Full Name
Fluorosilicone:
Fluorosilicone (FVMQ, FSIL)
Buna-N:
Buna-N (NBR, Nitrile, Buna)
Short Name
Fluorosilicone:
Fluorosilicone
Buna-N:
Buna-N
Common Names
Fluorosilicone:
Fluorosilicone, FVMQ
Buna-N:
Buna-N, Nitrile, NBR, Acrylonitrile Butadiene Rubber
Mechanical Properties
Specialty Resistances
Common Fuels
Common Fuels
Diluted Alkalies
Diluted Alkalies
Silicone Oils
Silicone Oils
Vegetable Oils
Vegetable Oils
Some Petroleum Oils
Alcohols
Some Acids
Di-ester Lubricants
Ammonia
Ethylene Glycol Fluids
Wide Temperature Range
Petroleum Oils
Dry Heat
Water
Phosphate Esters
Hydraulic Fluids
Jet Fuels
Aliphatic Hydrocarbons
Benzene
Greases
Toluene
Mineral Oils
Aromatic Fluorocarbons
Solvents
Aliphatic Fluorocarbons
Acids
Diester Oils
Chlorinated Solvents
Animal Oils
Oxidizing Chemicals
Weathering And Sunlight
Aging
Chlorinated Hydrocarbons
Aromatic Hydrocarbons
Compression Set
Ozone
Specialty Resistances
Fluorosilicone
Some Petroleum Oils
Some Acids
Ammonia
Wide Temperature Range
Dry Heat
Phosphate Esters
Jet Fuels
Benzene
Toluene
Aromatic Fluorocarbons
Aliphatic Fluorocarbons
Diester Oils
Chlorinated Solvents
Animal Oils
Oxidizing Chemicals
Weathering And Sunlight
Aging
Chlorinated Hydrocarbons
Aromatic Hydrocarbons
Compression Set
Ozone
Buna-N
Alcohols
Di-ester Lubricants
Ethylene Glycol Fluids
Petroleum Oils
Water
Hydraulic Fluids
Aliphatic Hydrocarbons
Greases
Mineral Oils
Solvents
Acids
Brands
Silastic®
Nipol®
Brands
Fluorosilicone
Silastic®
Buna-N
Nipol®
Limitations
Ketones
Ketones
Phosphate-ester Bases
UV Light
Adelhydes
Aldehydes
Hydrazine
Aromatic Fuels
Dynamic Applications
Esters
Amines
Polar Solvents
Brake Fluids
Glycol Brake Fluids (DOT 3, 4, 5.1)
Weathering And Sunlight
Non-flammable Hydraulic Fluids
Chlorinated Hydrocarbons
Aromatic Hydrocarbons
Limitations
Fluorosilicone
Phosphate-ester Bases
Adelhydes
Hydrazine
Dynamic Applications
Amines
Brake Fluids
Buna-N
UV Light
Aldehydes
Aromatic Fuels
Esters
Polar Solvents
Glycol Brake Fluids (DOT 3, 4, 5.1)
Weathering And Sunlight
Non-flammable Hydraulic Fluids
Chlorinated Hydrocarbons
Aromatic Hydrocarbons
Marco Rubber & Plastics is an industry leader in custom sealing solutions that go beyond the limits of catalog commodities. Since 1980, our solutions have delivered reliable, long-lasting success for customers worldwide. We offer the largest inventory of specialty and standard sealing solutions backed by best-in-class technology, service and support.
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