FFKM vs Buna-N (NBR) for O-Rings and Seals
FFKM Perfluoroelastomer | Buna-N (NBR, Nitrile, Buna) |
Description | Both materials are well suited for use in the -15 to 125°C range. Buna-N has an advantage in lower temperatures and FFKM 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, FFKM has a significant advantage. The differences in compression set resistence show that both materials are equally Poor. Additionally, both materials are equally Poor when considering wear resistance. Also, FFKM has a slight advantage when comparing heat stability. Furthermore, both materials are equally Poor when comparing short term resilience. Finally, both materials are equally Poor when evaluating differences in permeation resilience. Both materials are resistant to solvents, aliphatic hydrocarbons and water, with FFKM having specific resistences to steam, ozone, broad spectrum chemical resistance, chlorinated hydrocarbons, aging, weathering and sunlight, ketones, esters, ethers, almost universal chemical resistance, extreme high temperatures, inorganic acids and organic acids. Buna-N has specific resistence to acids, common fuels, mineral oils, vegetable oils, greases, diluted alkalies, silicone oils, hydraulic fluids, 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: Z1029 | Datasheet: | Hardness: 75 | Color: White | Low Temp: 5 °F (-15 °C) | High Temp: 575 °F (305 °C) | Description: | |
Compound: Z1203 | Datasheet: | Hardness: 90 | Color: Black | Low Temp: 20 °F (-10 °C) | High Temp: 465 °F (245 °C) | Description: | |
Compound: Z1204 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: 20 °F (-10 °C) | High Temp: 450 °F (235 °C) | Description: | |
Compound: Z1028 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: 5 °F (-15 °C) | High Temp: 610 °F (320 °C) | Description: | |
Compound: Z1026 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: 5 °F (-15 °C) | High Temp: 485 °F (250 °C) | Description: | |
Compound: C505 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: -20 °F (-30 °C) | High Temp: 450 °F (235 °C) | Description: | |
Compound: C526 | Datasheet: | Hardness: 95 | Color: Black | Low Temp: -5 °F (-25 °C) | High Temp: 475 °F (250 °C) | Description: | |
Compound: C605 | Datasheet: | Hardness: 80 | Color: Black | Low Temp: -5 °F (-25 °C) | High Temp: 500 °F (260 °C) | Description: | |
Compound: C615 | Datasheet: | Hardness: 80 | Color: Black | Low Temp: 0 °F (-20 °C) | High Temp: 620 °F (330 °C) | Description: | |
Compound: K4079 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: 20 °F (-10 °C) | High Temp: 600 °F (320 °C) | Description: | |
Compound: K6375 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: -5 °F (-25 °C) | High Temp: 525 °F (275 °C) | Description: | |
Compound: K7075 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: 20 °F (-10 °C) | High Temp: 620 °F (330 °C) | Description: | |
Compound: K8575 | Datasheet: | Hardness: 60 | Color: White | Low Temp: 20 °F (-10 °C) | High Temp: 575 °F (305 °C) | Description: | |
Compound: K9100 | Datasheet: | Hardness: 75 | Color: Amber translucent | Low Temp: 20 °F (-10 °C) | High Temp: 575 °F (305 °C) | Description: | |
Compound: Z1206 | Datasheet: | Hardness: 75 | Color: White | Low Temp: 20 °F (-10 °C) | High Temp: 450 °F (235 °C) | Description: | |
Compound: Z1210 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: 20 °F (-10 °C) | High Temp: 525 °F (275 °C) | Description: | |
Compound: Z1216 | Datasheet: | Hardness: 75 | Color: White | Low Temp: 20 °F (-10 °C) | High Temp: 620 °F (330 °C) | Description: | |
Compound: Z1305 | Datasheet: | Hardness: 80 | Color: White | Low Temp: 5 °F (-15 °C) | High Temp: 590 °F (310 °C) | Description: | |
Compound: Z1307 | Datasheet: | Hardness: 75 | Color: Amber translucent | Low Temp: 5 °F (-15 °C) | High Temp: 525 °F (275 °C) | Description: | |
Compound: Z1317 | Datasheet: | Hardness: 90 | Color: Black | Low Temp: 5 °F (-15 °C) | High Temp: 500 °F (260 °C) | Description: | |
Compound: Z1319 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: 5 °F (-15 °C) | High Temp: 620 °F (330 °C) | Description: | |
Compound: Z1321 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: -50 °F (-50 °C) | High Temp: 480 °F (250 °C) | Description: | |
Compound: Z1322 | Datasheet: | Hardness: 90 | Color: Black | Low Temp: -50 °F (-50 °C) | High Temp: 460 °F (240 °C) | Description: | |
Compound: Z1352 | Datasheet: | Hardness: 80 | Color: Black | Low Temp: 5 °F (-15 °C) | High Temp: 500 °F (260 °C) | Description: | |
Compound: Z1401 | Datasheet: | Hardness: 80 | Color: Black | Low Temp: -20 °F (-30 °C) | High Temp: 615 °F (325 °C) | Description: | |
Compound: Z1403 | Datasheet: | Hardness: 80 | Color: White | Low Temp: -20 °F (-30 °C) | High Temp: 600 °F (315 °C) | Description: | |
Compound: Z1404 | Datasheet: | Hardness: 80 | Color: Black | Low Temp: -5 °F (-25 °C) | High Temp: 500 °F (260 °C) | Description: | |
Compound: Z1409 | Datasheet: | Hardness: 75 | Color: Black | Low Temp: 5 °F (-15 °C) | High Temp: 500 °F (260 °C) | Description: | |
Compound: Z1411 | Datasheet: | Hardness: 60 | Color: Clear-translucent | Low Temp: 5 °F (-15 °C) | High Temp: 535 °F (280 °C) | Description: | |
Compound: Z1412 | Datasheet: | Hardness: 90 | Color: Black | Low Temp: 5 °F (-15 °C) | High Temp: 590 °F (310 °C) | Description: | |
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. |
Temperature Range Comparison |
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Box: Base Material Family Range
Whiskers: Specialty Compounds
General Information | ||
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Full Name | FFKM: FFKM Perfluoroelastomer | Buna-N: Buna-N (NBR, Nitrile, Buna) |
Short Name | FFKM: FFKM | Buna-N: Buna-N |
Common Names | FFKM: Perfluoroelastomers, FFKM, Markez | 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 | |
Solvents | Solvents | |
Water | Water | |
Organic Acids | Alcohols | |
Inorganic Acids | Di-ester Lubricants | |
Extreme High Temperatures | Ethylene Glycol Fluids | |
Almost Universal Chemical Resistance | Petroleum Oils | |
Ethers | Hydraulic Fluids | |
Esters | Silicone Oils | |
Ketones | Diluted Alkalies | |
Weathering And Sunlight | Greases | |
Aging | Vegetable Oils | |
Chlorinated Hydrocarbons | Mineral Oils | |
Broad Spectrum Chemical Resistance | Common Fuels | |
Ozone | Acids | |
Steam |
Specialty Resistances | |
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FFKM | Organic Acids Inorganic Acids Extreme High Temperatures Almost Universal Chemical Resistance Ethers Esters Ketones Weathering And Sunlight Aging Chlorinated Hydrocarbons Broad Spectrum Chemical Resistance Ozone Steam |
Buna-N | Alcohols Di-ester Lubricants Ethylene Glycol Fluids Petroleum Oils Hydraulic Fluids Silicone Oils Diluted Alkalies Greases Vegetable Oils Mineral Oils Common Fuels Acids |
Brands | ||
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Chemraz® | Nipol® | |
Perlast® | ||
Markez® | ||
Isolast® | ||
Parofluor® | ||
Kalrez® |
Brands | |
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FFKM | Chemraz® Perlast® Markez® Isolast® Parofluor® Kalrez® |
Buna-N | Nipol® |
Limitations | ||
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Fluorinated Fluids | UV Light | |
Fluorinated Refrigerants | Aldehydes | |
Perfluorinated Lubricants | Aromatic Fuels | |
Extreme Low Temperatures | Esters | |
Dynamic Applications | Polar Solvents | |
Molten Alkali Metals | Ketones | |
Hot Amines | Glycol Brake Fluids (DOT 3, 4, 5.1) | |
Weathering And Sunlight | ||
Non-flammable Hydraulic Fluids | ||
Chlorinated Hydrocarbons | ||
Aromatic Hydrocarbons |
Limitations | |
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FFKM | Fluorinated Fluids Fluorinated Refrigerants Perfluorinated Lubricants Extreme Low Temperatures Dynamic Applications Molten Alkali Metals Hot Amines |
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 Aromatic Hydrocarbons |