What are green O-rings for?

Green o rings are hydrogenated Nitrile, also known as highly saturated Nitrile, or more commonly known as HNBR. These o rings have the green colour moulded into their rubber and were introduced with the refrigerant of 134a, suitable for high temperatures and fluctuating stress loads.

Why are different Colours used for O-rings?

Across the rubber industry, O-rings are not color coded. Many customers adopt a method of color-coding to help prevent mixed seal inventory. Seal materials cannot be conclusively identified by color.

Can you use green O-ring for gas?

Buna O-rings, also known as nitrile or NBR O-rings, offer excellent sealing and mechanical properties at a low cost. Buna O-rings have resistance to common lubricants and are recommended for crude oil, gasoline, propane, petroleum oils and water.

What are the different types of O-rings?

Some of the common types of O-ring materials include PTFE, Nitrile (Buna), Neoprene, EPDM Rubber and Fluorocarbon (Viton). Silicone and Kalrez® O-ring materials are also widely used, especially in high temperature applications.

How do you choose an O-ring?

O-Ring Size

The size of an O-ring can be determined by measuring the diameters and the width of the cross-section. The measurement you will need to include are the internal diameter (ID), outside diameter (OD), and the cross-section width (CS).

What O-ring material is best 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 type of O-ring is fuel resistant?

The name Viton is a trademark, a bit like Hoover or Sellotape, and refers to fluorocarbon o rings, or FKM/FPM for short. This material has an excellent tolerance for high temperatures, resistance to oils, fuels and hydraulic fluids as well as aromatics and solvents.

What are red O-rings for?

The red gasket, thanks to its particular mix, has a high resistance to aggressive fluids. For example, if the system distributes mineral oils or hydrocarbon oils, the red O-ring will be the right choice to guarantee the maximum tightness.

What are black O-rings used for?

The black O-Ring in EPDM is ideal for sanitary water, drinking water, fire prevention and heating applications.

What does shore mean in O-rings?

The Shore A type durometer scale is generally used to measure the hardness of most rubber compounds. Rocket Seals uses the Shore A scale. Normally, durometer hardness is referred to in increments of five or ten, such as 50 durometer, 70 durometer, 75 durometer, etc.

Why are some O-rings blue?

These blue o-rings are made from EP (ethylene propylene), which is more durable than silicone. These o-rings are also thicker than the red or black varieties, at 1.78mm, with a slightly smaller internal diameter.

What are O-ring seals?

O-ring seals are mechanical gaskets with a round cross-section. They are made from elastomer materials and used in pumps, cylinders, and other fluid applications to form a leak-proof seal between two parts.

How tight should an O-ring be?

To provide an effective seal, the O-ring's inside diameter (I.D.) 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. A stretch greater than 5% is not recommended.

What O-rings are best for hydraulics?

Nitrile (Buna-N) O-rings

Nitrile O-rings, which have a temperature range between -54 and 149 degrees Celsius, are suitable for use with water, petroleum oils and some hydraulic fluids.

What is the most durable O-ring material?

Fluorocarbon (Viton®)

Offering outstanding chemical and high-temperature resistance, fluorocarbon O-rings are among the most durable and versatile available. They are particularly valuable in aircraft engines and automotive fuel handling systems because they resist swell in high-octane and oxygenated fuels.

What is EPDM O-ring?

EPDM o-rings, or ethylene propylene o-rings, are a family of synthetic elastomers with lower cost steam and chemical resistance, particularly for applications involving solvents, acids and other mild chemicals.

Can you use two O-rings?

Yeah, it's fine. I have double o-rings on certain keys. It'll depend on how thick they are, but for mine, it took a little bit of time for them to squish in together since it made the keycap slightly taller than the other ones. If you want to do the whole keyboard, I suppose that would be less of an issue.

How do I know what size O-ring to buy?

If your O-Ring is cut or has snapped we can still work it out. Measure the length and the Cross section of the ring. Then divide the length by π (3.142), this will give you the circumference. Take the Cross section from this to give you the Inside diameter.

How much can you stretch an O-ring?

It's also important to be cognizant of how much you stretch the O-ring during installation—it should stretch no more than 50%, and any stretching should be performed uniformly rather than just one side.

What are Viton rings?

Viton® O-Rings

Viton is a brand of synthetic rubber and fluoropolymer elastomer commonly used in O-rings and other molded extruded goods. Viton is a registered trademark of DuPont and is sometimes generically referred to as FKM.

What are brown O-rings made of?

Brown O-Rings Buna-N - Nitrile (NBR) Duro 70: Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle.