Full Answer
What is the force required to compress an O-ring?
O-RING COMPRESSION FORCE The force required to compress each linear inch of an O-ring depends principally on the hardness of the O-ring, its cross section, and the amount of compression.
How do you use a compression O ring?
Force a 1" wide flat hard object down until it compresses the O-Ring (.010) enough to make full contact. Have an associate test your compression by pulling a piece of paper out from both ends. When the paper is snug read the scale. Multiply this force by 6 for 6 inches.
How do you calculate the amount of force on an O-ring?
Moving vertically to either the 70 or 90 durometer band, you will find the expected range of load in pounds per linear inch of O-ring. Multiplying this number by the O-ring circumference in inches, you are left with the approximate range of compressive force, in pounds.
How do I use the O-ring compression chart?
To use the chart, first determine the o-ring diameter, material hardness, then your design compression on the o-ring. With this you can determine the estimated compression force per linear inch of your installed o-ring.
How much force does it take to compress an O-ring?
The expected range of force needed to compress an oring 20% with a 0.070” diameter cross section (purple) that is 50 durometer is between 4.5 and 14 pounds per linear inch.
How do you calculate an O-ring squeeze?
Find your o-ring's squeeze amount in inches by subtracting the gland depth from cross-sectional diameter with a calculator. For example, if your o-ring's cross-sectional diameter is 1.25 inches and its gland depth is 1.20 inches, subtract 1.20 from 1.25 to determine that the o-ring is able to squeeze out a total of .
How much crush does an O-ring need?
must be smaller than the piston groove diameter, so that the O-ring is slightly stretched, fitting snugly in the groove. This stretch should be between 1%-5% with 2% as the ideal in most applications.
Can you over compress an O-ring?
Over compression. Failing to limit the compression of an O-Ring can cause premature failure due to a higher level of compression set. Compression set failure appears very similar to abrasion failure, where there is flattening on one or both sides of the O-Ring cross section.
What is O-ring compression set?
When an elastomeric material fails to return to its original size after release from a constant compressive load, the amount of material that remains compressed is called a compression set. To be effective, o-rings require a complete, continuous seal to form between sealed surfaces.
How do you measure a gasket compression?
Gasket Compression Pecentage Calculation720 lb Clamp, Foot Print / Contact Area Foot Size: 3″ x 12″ each. ... HT-800 Silicone Pad Size: 3″ x 12″ each. ... Mounting Plate.Calculation: Load / Area = 720lb / 72 in² = 10 lb/in²Compression: From the Compression Force Deflection Curve, HT-800 will compress approximately 30%.
How do you make an O-ring seal better?
0:187:29O-Rings? O-Yeah! How to Select, Design, and Install O-Ring SealsYouTubeStart of suggested clipEnd of suggested clipThe fluid pressure is lower than the contact stress then the seal prevents the fluid from escaping.MoreThe fluid pressure is lower than the contact stress then the seal prevents the fluid from escaping. In general as the fluid pressure increases.
Are o-rings good for high pressure?
High-durometer o-rings are better suited for higher pressures and are more resistant to extrusion. Hard material yields higher pressure required to force the o-ring into extruding. The only drawback to a high durometer is the decreased squeeze of the o-ring.
What causes an O-ring to fail?
The most common causes of O-Ring failures include: Improper gland design, allowing for too much or too little compression, not enough for seal expansion and tolerance stack-up. Incorrect O-Ring size. Incompatibility of O-Ring elastomer and environmental elements.
What would happen if you did not lubricate the pump O-ring?
Allowing an oil pump O-ring leak to go unrepaired can lead to persistently low oil levels and seriously damage an engine. Common signs that your oil pump O-ring needs replacing include visible wear and cuts or gashes on the oil pump O-ring.
What is the expected range of force needed to compress an oring 20% with a 0.070” diameter cross section
The expected range of force needed to compress an oring 20% with a 0.070” diameter cross section (purple) that is 50 durometer is between 4.5 and 14 pounds per linear inch.
Which material has the highest compressive modulii?
Nitrile, Fluorosilicone, and Fluorocarbon are midrange. Silicone and EPDM generally have higher compressive modulii. The “per linear inch” scale is used to account for orings and seals of different sizes.
Re: O-Ring Compression force
In fact using the Parker chart you can obtain an equation and use it with very good results as I did many years ago because I wanted to determine the friction of O-rings in a special piston-cylinder couple.
Re: O-Ring Compression force
I appreciate the response, but doing an FEA run to get results is like using a sledgehammer to put a tack in corkboard. All I need is a simple equation that lets me plug in material and size coefficients that will give me a force/length number.
Re: O-Ring Compression force
I derived the equation from Parker's data. It is as simple as that. Today when almost everybody has a FEA soft (even I as a simple expert/consultant am equiped with ALGOR) it is not any more a too complex acces as before.
Re: O-Ring Compression Force
How about empirical? If you have access to a machine shop make a .060 groove in a block of wood, aluminum, plastic etc. Lay an O Ring in the groove set the whole thing on a bathroom type scale. Force a 1" wide flat hard object down until it compresses the O-Ring (.010) enough to make full contact.
O rings online tools
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What you can do with the O ring compression calculation tool?
O Ring dimensions for the use in a specific groove groove dimensions for the use of a specific O-Ring evaluation of both, any combination of O-Ring and groove for axial seals with inner or outer pressure, piston seals and rod seal applications. Worldwide unique online calculation tool taking into consideration of the thermal expansion of the construction parts and the O-Ring.
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How to lower compressive load of O-ring?
The simple solution to lowering the compressive load of an O-ring is to switch to a softer O-ring material. Changing to a softer material can reduce O-ring compression force up to 50%.#N#Learn More
Is it easier to change the seal than the hardware?
Many times it is easier to change the seal than the hardware. The issue with decreasing the seal compression is that this can compromise the O-ring’s life due to increased compression set. Testing shows the optimum amount of seal compression for static seal is generally in the 25% range.