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Nitrile Failing in Hydraulic Oil
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(Mechanical)
(OP)
20 Jun 07 18:43I am using a die cut nitrile bumper .25" thick inside of a shock absorber for an internal extension cushion. Some have failed some have not. When the part does fail its catastrophic destroying all the internals of the shock absorber due to contamination which plugs the ports, bends/breaks shims and makes a non damping unit.
I am trying to figure out why nitrile is failing in oil where it is supposed to be compatibile with and when the seals sealing the shock are nitrile...
Temps range from 60F to 150F..180F rarely so it is within the temp ranges of the material and the seals, sealing the shock are nitrile and we have never seen a failure.
Any help is appreciated. The bumper supplier and seal supplier are not the same.
(Materials)
21 Jun 07 15:53Could you better describe the failure of the die cut part? Does it swell, shrink or just break up?
(Mechanical)
(OP)
25 Jun 07 13:45It swells and breaks up. Failure looks identical to rubber submerged in oil that is agitated...nothing but pieces/chunks left and the oil is compleltly contaminated/black.
The cushion sees a compression loading of roughly 2000lbs everytime the tire unloads.
(Materials)
26 Jun 07 08:47First verify that it is in fact made from nitrile rubber. An FTIR analysis would tell you this. If it is, you will have to dig deeper. Look at state of cure. Find out what plasticizers are used in the rubber compound.
(Chemical)
3 Jul 07 13:27I agree about verifying that the rubber is indeed nitrile rubber. If it is, there can be significant differences between the quality of different nitrile rubber compounds. I'm assuming you're buying the nitrile rubber from a supplier and it's not your formula.
Nitrile rubber, the base rubber I'm talking about here, not compounds, comes in slightly different compositions, varying in the levels of acryloNITRILE and butadiene that are used to polymerize into nitrile (or NBR) rubber. Higher acrylonitrile (ACN), the better the oil and probably hydraulic fluid resistance. Higher butadiene, better low temperature properties, but poorer oil resistance. Also, compounds can be cheapened by adding higher amounts of fillers and plasticizers, giving poorer strength properties. Some compounds that don't need as good oil resistance can have other rubbers (e.g., polybutadiene or SBR rubbers) blended with it, as these are generally less expensive than nitrile rubber.
Regards,
tom
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So, what makes Nitrile Rubber (NBR) unique?
Nitrile rubber, also known as NBR, Buna-N, and acrylonitrile butadiene rubber, is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene.
Although its physical and chemical properties vary depending on the polymer’s composition of nitrile, this particular type of synthetic rubber is unusual in being generally resistant to oil, fuel, and other chemicals. So, the more nitrile within the polymer, the higher the resistance to oils but the lower the flexibility of the material.
Nitrile is the most widely used elastomer in the seal industry today. It is used in the automotive and aeronautical industry to make fuel and oil handling hoses, seals, grommets, and self-sealing fuel tanks, since ordinary rubbers cannot be used. NBR’s ability to withstand a range of temperatures from -40 to 108 °C (-40 to 226 °F) makes it an ideal material for aeronautical applications. Nitrile butadiene is also used to create moulded goods, footwear, adhesives, sealants, sponges, expanded foams, and floor mats. The uses of nitrile rubber include disposable non-latex gloves, automotive transmission belts, hoses, O-rings, gaskets, oil seals, V belts, static & dynamic hydraulic seals, synthetic leather, printer’s form rollers, and as cable jacketing; NBR latex can also be used in the preparation of adhesives and as a pigment binder.
Typical applications: Aircraft Fuel Systems, Automotive Fuel Systems, Off-Road Equipment & Marine Fuel Systems.
Its resilience also makes NBR a useful material for disposable lab, cleaning, and examination gloves. Nitrile rubber is more resistant than natural rubber to oils and acids, with superior strength, but does have less flexibility. Nitrile gloves are therefore more puncture-resistant than natural rubber gloves, especially if the latter are degraded by exposure to chemicals or ozone. Nitrile rubber is also less likely to cause an allergic reaction than natural rubber. Unlike polymers meant for ingestion, where small inconsistencies in chemical composition/structure can have a pronounced effect on the body, the general properties of NBR are not altered by minor structural/compositional differences.
Nitrile’s can be specially compounded to meet International Food Standards such as FDA 21.177 2600; (EC) 1935:2004; BfR XXI.
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