What durometer O-ring should I use?
Table of Contents
What durometer O-ring should I use?
70-durometer
70-durometer hardness should be used whenever possible as it offers the best combination of properties for most o-ring applications.
How much pressure can an O-ring seal?
1,500 psi
Most o-rings are designed to operate at pressures up to 1,500 psi. At higher pressures, the material must have enough strength to resist extruding into the clearance gap. The chart shows the recommended combined limits of clearance, gap, material hardness and system pressure differential.
How much heat can a rubber O-ring take?
Excellent resistance to extreme temperatures -50°C to + 232°C (-58°F to +450°F). Some special compounds resist even higher temperatures. Retention of properties of silicone at high temperature is superior to most other elastic materials.
What is the number one cause of O-ring failures?
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.
Which is harder 70 or 90 durometer?
The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound. 70-durometer hardness should be used whenever possible as it offers the best combination of properties for most O-Rings applications.
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.
Are O-rings good for high pressure?
How heat resistant are O-rings?
PTFE O-Rings have the ability to handle temperatures of up to 250°C and offer chemical resistance to acids, alkalis and solvents. In actual fact, it also has the ability to withstand temperatures as low as -200°C.
What is the difference between black and green O-rings?
Difference between black o rings and green o rings Black o rings are most commonly used for auto air conditioning applications. Green o rings are hydrogenated Nitrile, also known as highly saturated Nitrile, or more commonly known as HNBR.
What is the strongest 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.
Are o-rings good for high pressure?
What temp do O-rings melt?
O-Ring Material Temperature Guide
| Degrees in Fahrenheit (F◦) | Degrees in Celsius (C◦) | Polymer Type |
|---|---|---|
| – 30° to 250° | – 34° to 121° | Nitrile (General Service) |
| – 65° to 225° | – 55° to 107° | Nitrile (Low Temperature) |
| – 15° to 500° | – 26° to 260° | Perfluoroelastomer (Parofluor) |
| – 5° to 350° | – 21° to 177° | Polyacrylate |
Are Nitrile O-rings heat resistant?
About NBR. Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -35°C to +120°C (-30°F to +250°F), Nitrile /NBR is the most widely used elastomer in the seal industry today.
What is the difference between high durometer and hard material O-rings?
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 is the maximum pressure for an O-ring?
Most o-rings are designed to operate at pressures up to 1,500 psi. At higher pressures, the material must have enough strength to resist extruding into the clearance gap. The chart shows the recommended combined limits of clearance, gap, material hardness and system pressure differential.
What is durometer (Shore durometer)?
What Is Durometer (Shore durometer)? The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound. 70-durometer hardness should be used whenever possible as it offers the best combination of properties for most O-Rings applications.
What is cycling pressure and how does it affect O-rings?
Cycling pressure can cause the o-ring to move back and forth within the gland. This motion can damage seals with low abrasion resistant materials. A higher durometer or an abrasion resistant material is recommended for these applications.
