Which is the Best Material for Your Oil Seal?

May 03, Oil Seals | Material | Silicone

An oil seal is basically a simple device, which is used to stop dirt, dust, water, and other contaminants from entering the shaft equipment. It is also known by other names like elastomeric lip seal, lip seal, shaft seal, or rotary shaft seal. The seal, while doing its job, helps retain the lubrication of a rotary shaft equipment. These seals are mainly used to protect the bearings used in a rotating shaft.

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Materials Used to Make Oil Seals:

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Oil seals can be made from a vast range of materials depending upon the application. Some common materials used to manufacture oil seals include:

1. Silicone: The widest range of operating temperature range is provided by silicone compounds. They offer an amazing temperature range from -90°F to 340°F. Nonetheless, in dry running conditions, these compounds do not perform well. It is always advisable to avoid the usage of silicone compounds with oxidized oils and EP (Extreme Pressure) compounds.
   
   
2. Viton®: Viton® compounds are said to offer the widest operating temperature range varying from 40°F to 400°F. These are considered as the premium materials for the lip seals. In addition to this, these compounds are highly resistant to chemicals and abrasion. These qualities help Viton® deliver better good performance. Unlike silicone compounds, Viton® performs well in dry running applications.
3. Nitrile Buna-N: Most companies consider Nitrile Buna-N 70 durometer compound to be the perfect material for oil seals. The compound has several benefits, which makes it the first choice of material in a wide range of applications. Oils seals that are made from this material have a wide operating temperature range from -65°F to 250°F. In addition to this, this material is compatible to work with water, as well as common mineral oil and greases.
   
   

Above mentioned are some materials used for manufacturing oil seals. Each material has its own set of pros and cons. Therefore, selection of materials should be made on the basis of the application. There are quite a variety of materials to choose from. If you find it tricky to select the right material for oil seals, you can always ask an expert. SSP Manufacturing, Inc. is one such expert in manufacturing oil seals in the USA. Please contact us by : +1-888-238- or with any questions.

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I am trying to help a friend rebuild food-mixer rotary heads. They incorporate elastomer lip seals, one facing out to keep food out, and one facing in to retain lube. They are a proprietary size (M 8 x 20, IIRC), made by a Taiwan company that will not sell a few to me.

I know several companies make oil seals to order, machining them out of some elastomer rod stock instead of molding rubber or crimping leather or teflon on a drawn cup. Has anyone here done this? Suggestions on materials and sources?

Thanks! Thanks, Limy. Teflon is easy to come by and easy to machine, but takes a set or cold-flows. I think Teflon seals use a garter spring, which I do not want as a gunk-catcher. I thought it was a urethane or polyester that was used...but I may end up with Teflon.

Thanks, Limy. Teflon is easy to comer by and easy to machine, but takes a set or cold-flows. I think Teflon seals use a garter spring, which I do not want as a gunk-catcher. I thought it was a urethane or polyester that was used...but I may end up with Teflon.

Put it this way mag, I know where you're coming from, but making seals as I described has worked for me - I first did it as a get over, - I had to find some way of keeping oil in a gearbox until parts arrived! and found they worked that well they never were replaced with the pukka jobbies.

Allow planty of squeeze on the OD,and translate that to the big end of the ID Over here in the uk most serious seal suppliers can get custom made real cheap. IMHO if you don't want to spring energise it, you want to use Polyurethane rod and machine it from that. You need to be using a food safe grade too as if its in a food mixer it could well have accidental food contact etc. After i found a source i have not bothered makeing them in ages, poly is a pig to turn + the rods expensive and in my case i normally need large diamiters.

Seals like your discusing would be circa £10 each for just a couple, im sure it would be cheaper for qty too!

Other option might be just to hunt around single lip seals, see if you can find a off the shelf size thats narrow enough to get a pair in back to back? Your seal with an 8 x 20. That's a fairly large cross section. Have you considered using a seal with the same 8mm I.D but a smaller O.D, and just sleeving the bore they go into? They come in 12,15, 16 & 18mm O.D's.

Regards Phil. Thanks for all the good ideas The type of seal I can't seem to find for an 8mm rod or shaft looks like a rod-wiper, A regular oil seal has a recess on the "wet" side between the OD of the lip and the ID of the "can" that would fill with gunk. I am starting to think that I will just capture a Viton ot Teflon washer with undersize ID between SS washers.

Adama, you said you did find a sourde? Googleing Machinable Urethane has not yielded any thing promising..your UK supplier might not be convenient for me, but if you remember the name of the product, it might help. Have a look at an INA G or GR seal. They look more like a rod wiper, but tolerant rotary service.

And not much of a cavity for contamination. They only come 8 x 12 & 8 x 15, so you'd still have to sleeve.

Regards Phil.

http://www.schaeffler.com/remotemed...schaeffler_2/tpi/downloads_8/tpi128_de_en.pdf

Adama, you said you did find a sourde? Googleing Machinable Urethane has not yielded any thing promising..your UK supplier might not be convenient for me, but if you remember the name of the product, it might help.

Try googling polyurethane rod, Its what seals are, just everyone here seams to miss of the poly!

Polyurethane Rod - Direct Plastics Limited

Treat it a bit like stainless and it machines ok, IE sharp tools and take a cut. Have had succes using the upsharp alu polished alu inserts too on it.

In all honesty a std oil seal gearbox side then a rod wiper the other is probably what you realy want, Rod wipers that small are common in the Pnumatics world, they are defro out there, you just by the sounds of it need to make a adaptor to use a std of the shelf oil seal one side and a rod seal the other! Thanks for all the help! As usual for me this project started out as an effort to "help someone out", to repair an asssembly usually replace as a unit. Always a fun challenge. So I started by concentrating on the cheapest alternative: a stock item that the OEM marked up too much.

I'll have to decide if making adapters to use M8 x 12 or 15 will still save him anything over the oEM's replacement parts.

Thanks, all!!