Buna-N (NBR) vs Silicone for O-Rings and Seals
Buna-N (NBR, Nitrile, Buna) | Silicone (VMQ, SIL) |
Description | Both materials are well suited for use in the -35 to 125°C range. Buna-N has an advantage in lower temperatures and Silicone 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, Silicone has a significant advantage. The differences in compression set resistence show that Silicone has a slight advantage. Additionally, Silicone has a slight advantage when considering wear resistance. Also, Silicone has a slight advantage when comparing heat stability. Furthermore, Buna-N has a significant advantage when comparing short term resilience. Finally, Buna-N has a significant advantage when evaluating differences in permeation resilience. Both materials are resistant to vegetable oils, greases and silicone oils, with Buna-N having specific resistences to acids, solvents, common fuels, mineral oils, aliphatic hydrocarbons, diluted alkalies, hydraulic fluids, water, petroleum oils, ethylene glycol fluids, di-ester lubricants and alcohols. Silicone has specific resistence to ozone, compression set, weathering and sunlight, animal oils, oxygen, fungal growth, ketones, brake fluids, dry heat, wide temperature range, non-toxic and odorless. |
Compounds |
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Marco Compound Number | Datasheet | Hardness (Shore A) | Color | Low Temp | High Temp | Features | |
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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. | |
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. | |
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. | |
Compound: B1005 | Datasheet: | Hardness: 90 | Color: Black | Low Temp: -30 °F (-35 °C) | High Temp: 250 °F (125 °C) | Description: FDA compliant, higher hardness. | |
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. | |
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. | |
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. | |
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. | |
Compound: B1039 | Datasheet: | Hardness: 70 | Color: White | Low Temp: -30 °F (-35 °C) | High Temp: 250 °F (125 °C) | Description: | |
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. | |
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. | |
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. | |
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. | |
Compound: B1115 | Datasheet: | Hardness: 70 | Color: Blue | Low Temp: -40 °F (-40 °C) | High Temp: 250 °F (125 °C) | Description: | |
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. | |
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). | |
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. | |
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. | |
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. | |
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. | |
Compound: S1000 | Datasheet: | Hardness: 70 | Color: Orange | Low Temp: -75 °F (-60 °C) | High Temp: 400 °F (205 °C) | Description: General purpose and FDA compliant Silicone per 21 CFR 177.2600 (available in nearly any color and durometer) | |
Compound: S1001 | Datasheet: | Hardness: 70 | Color: Orange | Low Temp: -75 °F (-60 °C) | High Temp: 400 °F (205 °C) | Description: | |
Compound: S1004 | Datasheet: | Hardness: 40 | Color: Orange | Low Temp: -75 °F (-60 °C) | High Temp: 400 °F (205 °C) | Description: General purpose softer than standard Silicone to seal rough or warped glands and or low closure force applications | |
Compound: S1015 | Datasheet: | Hardness: 70 | Color: Orange | Low Temp: -65 °F (-55 °C) | High Temp: 600 °F (320 °C) | Description: Higher temperature resistant Silicone | |
Compound: S1020 | Datasheet: | Hardness: 70 | Color: Clear-translucent | Low Temp: -65 °F (-55 °C) | High Temp: 400 °F (205 °C) | Description: Clear-Translucent and FDA compliant Silicone per 21 CFR 177.2600 | |
Compound: S1032 | Datasheet: | Hardness: 70 | Color: Yellow | Low Temp: -75 °F (-60 °C) | High Temp: 400 °F (205 °C) | Description: | |
Compound: S1037 | Datasheet: | Hardness: 70 | Color: Clear-translucent | Low Temp: -65 °F (-55 °C) | High Temp: 400 °F (205 °C) | Description: Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Clean Room Manufactured | |
Compound: S1043 | Datasheet: | Hardness: 50 | Color: Orange | Low Temp: -105 °F (-75 °C) | High Temp: 400 °F (205 °C) | Description: Lower temperature resistant Silicone | |
Compound: S1081 | Datasheet: | Hardness: 65 | Color: Dark gray | Low Temp: -65 °F (-55 °C) | High Temp: 350 °F (180 °C) | Description: EMI RFI Shielding Nickel Coated Graphite filled Silicone, Volume Resistivity 0.10 ohm-cm | |
Compound: S1083 | Datasheet: | Hardness: 70 | Color: Clear-translucent | Low Temp: -65 °F (-55 °C) | High Temp: 400 °F (205 °C) | Description: Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured | |
Compound: S1146 | Datasheet: | Hardness: 70 | Color: White | Low Temp: -75 °F (-60 °C) | High Temp: 480 °F (250 °C) | Description: Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured | |
Compound: S1184 | Datasheet: | Hardness: 70 | Color: Red | Low Temp: -75 °F (-60 °C) | High Temp: 400 °F (205 °C) | Description: | |
Compound: S1206 | Datasheet: | Hardness: 80 | Color: | Low Temp: -75 °F (-60 °C) | High Temp: 400 °F (205 °C) | Description: |
Temperature Range Comparison |
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Box: Base Material Family Range
Whiskers: Specialty Compounds
General Information | ||
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Full Name | Buna-N: Buna-N (NBR, Nitrile, Buna) | Silicone: Silicone (VMQ, SIL) |
Short Name | Buna-N: Buna-N | Silicone: Silicone |
Common Names | Buna-N: Buna-N, Nitrile, NBR, Acrylonitrile Butadiene Rubber | Silicone: Silicone, VMQ, PVMQ |
Mechanical Properties |
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Specialty Resistances | ||
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Greases | Greases | |
Silicone Oils | Silicone Oils | |
Vegetable Oils | Vegetable Oils | |
Alcohols | Odorless | |
Di-ester Lubricants | Non-toxic | |
Ethylene Glycol Fluids | Wide Temperature Range | |
Petroleum Oils | Dry Heat | |
Water | Brake Fluids | |
Hydraulic Fluids | Ketones | |
Diluted Alkalies | Fungal Growth | |
Aliphatic Hydrocarbons | Oxygen | |
Mineral Oils | Animal Oils | |
Common Fuels | Weathering And Sunlight | |
Solvents | Compression Set | |
Acids | Ozone |
Specialty Resistances | |
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Buna-N | Alcohols Di-ester Lubricants Ethylene Glycol Fluids Petroleum Oils Water Hydraulic Fluids Diluted Alkalies Aliphatic Hydrocarbons Mineral Oils Common Fuels Solvents Acids |
Silicone | Odorless Non-toxic Wide Temperature Range Dry Heat Brake Fluids Ketones Fungal Growth Oxygen Animal Oils Weathering And Sunlight Compression Set Ozone |
Brands | ||
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Nipol® | Thermoflex® | |
Elastosil® | ||
Silastic® |
Brands | |
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Buna-N | Nipol® |
Silicone | Thermoflex® Elastosil® Silastic® |
Limitations | ||
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Aromatic Hydrocarbons | Aromatic Hydrocarbons | |
UV Light | Diluted Sodium Hydroxide | |
Aldehydes | High Gas Permeability | |
Aromatic Fuels | Dynamic Applications | |
Esters | Alkalis | |
Polar Solvents | Aromatic Mineral Oils | |
Ketones | Concentrated Solvents | |
Glycol Brake Fluids (DOT 3, 4, 5.1) | Concentrated Acids | |
Weathering And Sunlight | Hydrocarbon Fuels | |
Non-flammable Hydraulic Fluids | Steam | |
Chlorinated Hydrocarbons | Acids |
Limitations | |
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Buna-N | UV Light Aldehydes Aromatic Fuels Esters Polar Solvents Ketones Glycol Brake Fluids (DOT 3, 4, 5.1) Weathering And Sunlight Non-flammable Hydraulic Fluids Chlorinated Hydrocarbons |
Silicone | Diluted Sodium Hydroxide High Gas Permeability Dynamic Applications Alkalis Aromatic Mineral Oils Concentrated Solvents Concentrated Acids Hydrocarbon Fuels Steam Acids |