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 | Datasheet | Hardness (Shore A) | Color | Low Temp | High Temp | Features | |||
|---|---|---|---|---|---|---|---|---|---|
| Compound: B1000 | Datasheet:  | Hardness: 70 | Color: Black | Low 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. | Get Quote | Buy Online | |
| Compound: B1001 | Datasheet: | Hardness: 90 | Color: Black | Low 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. | Get Quote | Buy Online | |
| Compound: B1002 | Datasheet: | Hardness: 70 | Color: Black | Low 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. | Get Quote | Buy Online | |
| Compound: B1005 | Datasheet: | Hardness: 90 | Color: Black | Low Temp: -30 °F (-35 °C) | High Temp: 250 °F (125 °C) | Description: FDA compliant, higher hardness. | Get Quote | Buy Online | |
| Compound: B1006 | Datasheet: | Hardness: 50 | Color: Black | Low 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. | Get Quote | Buy Online | |
| Compound: B1010 | Datasheet: | Hardness: 80 | Color: Black | Low Temp: -30 °F (-35 °C) | High Temp: 225 °F (110 °C) | Description: General purpose, higher hardness. Compare to Parker N0368-80. | Get Quote | Buy Online | |
| Compound: B1011 | Datasheet: | Hardness: 70 | Color: Black | Low 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. | Get Quote | Buy Online | |
| Compound: B1017 | Datasheet: | Hardness: 70 | Color: Black | Low Temp: -35 °F (-40 °C) | High Temp: 250 °F (125 °C) | Description: UL 157 listed for several approved uses. | Get Quote | Buy Online | |
| Compound: B1039 | Datasheet: | Hardness: 70 | Color: White | Low Temp: -30 °F (-35 °C) | High Temp: 250 °F (125 °C) | Description: | Get Quote | Buy Online | |
| Compound: B1058 | Datasheet: | Hardness: 70 | Color: Black | Low Temp: -30 °F (-35 °C) | High Temp: 250 °F (125 °C) | Description: NSF 61 certified for drinking water applications. | Get Quote | Buy Online | |
| Compound: B1063 | Datasheet: | Hardness: 95 | Color: Black | Low Temp: -30 °F (-35 °C) | High Temp: 250 °F (125 °C) | Description: Very high hardness for extreme pressure applications. | Get Quote | Buy Online | |
| Compound: B1083 | Datasheet: | Hardness: 70 | Color: Black | Low 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. | Get Quote | Buy Online | |
| Compound: B1105 | Datasheet: | Hardness: 70 | Color: Black | Low 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. | Get Quote | Buy Online | |
| Compound: B1115 | Datasheet: | Hardness: 70 | Color: Blue | Low Temp: -40 °F (-40 °C) | High Temp: 250 °F (125 °C) | Description: | Get Quote | Buy Online | |
| Compound: B1122 | Datasheet: | Hardness: 70 | Color: Black | Low Temp: -30 °F (-35 °C) | High Temp: 250 °F (125 °C) | Description: NSF 51 certified for food contact. | Get Quote | Buy Online | |
| Compound: M1000 | Datasheet: | Hardness: 70 | Color: Black | Low 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). | Get Quote | Buy Online | |
| Compound: M1001 | Datasheet: | Hardness: 75 | Color: Black | Low 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. | Get Quote | Buy Online | |
| Compound: M1002 | Datasheet: | Hardness: 65 | Color: Black | Low Temp: -65 °F (-55 °C) | High Temp: 250 °F (125 °C) | Description: Mil Spec (Military specification) MS29513-###, MS29512-##, AMS-P-5315B. | Get Quote | Buy Online | |
| Compound: M1004 | Datasheet: | Hardness: 90 | Color: Black | Low Temp: -65 °F (-55 °C) | High Temp: 275 °F (135 °C) | Description: Mil Spec (Military specification) MS28778, AMS-P-5510C. | Get Quote | Buy Online | |
| Compound: M1005 | Datasheet: | Hardness: 65 | Color: Black | Low Temp: -70 °F (-60 °C) | High Temp: 200 °F (95 °C) | Description: Mil Spec (Military specification) AMS7271, AS3578. | Get Quote | Buy Online | |
| Compound: F1001 | Datasheet: | Hardness: 70 | Color: Blue | Low 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 | Get Quote | Buy Online | |
| Compound: F1002 | Datasheet: | Hardness: 75 | Color: Blue | Low 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 | Get Quote | Buy Online | |
| Compound: F1003 | Datasheet: | Hardness: 60 | Color: Blue | Low 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 | Get Quote | Buy Online | |
| Compound: F1006 | Datasheet: | Hardness: 40 | Color: Blue | Low Temp: -100 °F (-75 °C) | High Temp: 350 °F (180 °C) | Description: Jet fuel resistance | Get Quote | Buy Online |
| 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.
