Polyurethane vs Buna-N (NBR) for O-Rings and Seals
Polyurethane (PU, TPU) | Buna-N (NBR, Nitrile, Buna) |
Description | Both materials are well suited for use in the -23 to 66°C range. Buna-N has an advantage in lower temperatures and Buna-N 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, Polyurethane has a slight advantage. The differences in compression set resistence show that Buna-N has a significant advantage. Additionally, Buna-N has a significant advantage when considering wear resistance. Also, Buna-N has a significant advantage when comparing heat stability. Furthermore, Polyurethane has a slight advantage when comparing short term resilience. Finally, both materials are equally Poor when evaluating differences in permeation resilience. Both materials are resistant to common fuels, mineral oils, greases, aliphatic hydrocarbons, silicone oils, hydraulic fluids and water, with Polyurethane having specific resistences to ozone, chlorinated hydrocarbons, aging, weathering and sunlight, oxygen, tear, brake fluids, silicone greases, some petroleum oils and some hydrocarbon fuels. Buna-N has specific resistence to acids, solvents, vegetable oils, diluted alkalies, petroleum oils, ethylene glycol fluids, di-ester lubricants and alcohols. |
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: P1000 | Datasheet: | Hardness: 70 | Color: Yellow translucent | Low Temp: -65 °F (-55 °C) | High Temp: 250 °F (125 °C) | Description: High performance 70 durometer Polyurethane | |
Compound: P1001 | Datasheet: | Hardness: 90 | Color: Yellow translucent | Low Temp: -65 °F (-55 °C) | High Temp: 250 °F (125 °C) | Description: High performance 90 durometer Polyurethane | |
Compound: P1004 | Datasheet: | Hardness: 90 | Color: Translucent | Low Temp: -30 °F (-35 °C) | High Temp: 180 °F (85 °C) | Description: General purpose 90 durometer Polyurethane | |
Compound: P1006 | Datasheet: | Hardness: 70 | Color: Translucent | Low Temp: -30 °F (-35 °C) | High Temp: 180 °F (85 °C) | Description: General purpose 70 durometer Polyurethane |
Temperature Range Comparison |
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Box: Base Material Family Range
Whiskers: Specialty Compounds
General Information | ||
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Full Name | Polyurethane: Polyurethane (PU, TPU) | Buna-N: Buna-N (NBR, Nitrile, Buna) |
Short Name | Polyurethane: Polyurethane | Buna-N: Buna-N |
Common Names | Polyurethane: Urethane, AU, EU, PU | Buna-N: Buna-N, Nitrile, NBR, Acrylonitrile Butadiene Rubber |
Mechanical Properties |
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Specialty Resistances | ||
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Aliphatic Hydrocarbons | Aliphatic Hydrocarbons | |
Common Fuels | Common Fuels | |
Greases | Greases | |
Hydraulic Fluids | Hydraulic Fluids | |
Mineral Oils | Mineral Oils | |
Silicone Oils | Silicone Oils | |
Water | Water | |
Some Hydrocarbon Fuels | Alcohols | |
Some Petroleum Oils | Di-ester Lubricants | |
Silicone Greases | Ethylene Glycol Fluids | |
Brake Fluids | Petroleum Oils | |
Tear | Diluted Alkalies | |
Oxygen | Vegetable Oils | |
Weathering And Sunlight | Solvents | |
Aging | Acids | |
Chlorinated Hydrocarbons | ||
Ozone |
Specialty Resistances | |
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Polyurethane | Some Hydrocarbon Fuels Some Petroleum Oils Silicone Greases Brake Fluids Tear Oxygen Weathering And Sunlight Aging Chlorinated Hydrocarbons Ozone |
Buna-N | Alcohols Di-ester Lubricants Ethylene Glycol Fluids Petroleum Oils Diluted Alkalies Vegetable Oils Solvents Acids |
Brands | ||
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Vibrathane® | Nipol® | |
Millathane® | ||
Adiprene® |
Brands | |
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Polyurethane | Vibrathane® Millathane® Adiprene® |
Buna-N | Nipol® |
Limitations | ||
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Esters | Esters | |
Ketones | Ketones | |
Hot Water | UV Light | |
Alcohols | Aldehydes | |
Alkalis | Aromatic Fuels | |
Ethers | Polar Solvents | |
Glycols | Glycol Brake Fluids (DOT 3, 4, 5.1) | |
Amines | Weathering And Sunlight | |
Steam | Non-flammable Hydraulic Fluids | |
Acids | Chlorinated Hydrocarbons | |
Aromatic Hydrocarbons |
Limitations | |
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Polyurethane | Hot Water Alcohols Alkalis Ethers Glycols Amines Steam Acids |
Buna-N | UV Light Aldehydes Aromatic Fuels Polar Solvents Glycol Brake Fluids (DOT 3, 4, 5.1) Weathering And Sunlight Non-flammable Hydraulic Fluids Chlorinated Hydrocarbons Aromatic Hydrocarbons |