Fitting O-ring into a square groove

29 Apr.,2024

 

Fitting O-ring into a square groove



http://www.parker.com/literature/ORD%205700%20Parker_O-Ring_Handbook.pdf

It's 9MB, so it'll take a bit to download if you live in the sticks. The groove is a square with generous radii, correct?

The proper amount of "squeeze" is built into the specifications of a particular groove, and is based on the cross-section of the O-ring itself. It should stay in the groove if it's cut correctly AND is the proper length. Sometimes if you kiss the face with a semi-loaded stone it will knock the burr left from cutting the groove down, and the O-ring will catch on that.

What is the size of the O-ring? If it's small, you can smear some grease on it with your finger and that will keep it in place. If it's a large cross-section, you can die grind or mill the groove so it's undercut near the bottom of the groove, on the "inside side".

The handbook is here:It's 9MB, so it'll take a bit to download if you live in the sticks. The groove is a square with generous radii, correct?The proper amount of "squeeze" is built into the specifications of a particular groove, and is based on the cross-section of the O-ring itself. It should stay in the groove if it's cut correctly AND is the proper length. Sometimes if you kiss the face with a semi-loaded stone it will knock the burr left from cutting the groove down, and the O-ring will catch on that.What is the size of the O-ring? If it's small, you can smear some grease on it with your finger and that will keep it in place. If it's a large cross-section, you can die grind or mill the groove so it's undercut near the bottom of the groove, on the "inside side".

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O-Ring General Groove Design

The color of an O-ring does not necessarily indicate its heat resistance. O-rings are made from various elastomer materials, and their heat resistance depends on the specific material used rather than their color.

Heat resistance of O-rings is determined by the elastomer material's formulation and its ability to withstand elevated temperatures without losing its sealing properties or degrading. Common elastomer materials used for heat-resistant O-rings include:
The color of an O-ring doesn't inherently signify a specific characteristic or quality; rather, it's often used as a means to identify different materials or specifications. Here's a general guide to what different colored O-rings might indicate:

1. Black: The most common color for O-rings, typically made of nitrile (Buna-N), neoprene, EPDM, or other general-purpose materials. These are widely used in various applications due to their good resistance to oils, fuels, and certain chemicals. However, it should be noted that virtually any elastomeric material can be, and will frequently be manufactured in black colorations. This includes specialty materials like Aflas, FFKM Perfluoroelastomers, and silicone.

2. Blue: Fluorosilicone O-rings are typically manufactured in blue colorations. Also, blue is often associated with FDA-approved materials that are safe for food, water, and beverage contact. Blue O-rings are also easily detectable, which helps in maintaining safety standards in food processing industries.

3. Green: Commonly indicates the presence of hydrogenated nitrile (HNBR), which offers better heat and chemical resistance compared to standard nitrile. Viton® (fluorocarbon rubber) can also frequently be found in green colorations.

4. Brown: Typically signifies the use of Viton® (fluorocarbon rubber), known for its excellent resistance to high temperatures and chemicals, including petroleum products.

5. Red, Orange, or Pink: Frequently used for silicone O-rings, which are known for their heat resistance and use in food-grade applications.

6. White or Clear: Often indicates that the O-ring is made from silicone, Teflon (PTFE), or another material that is suitable for sanitary or medical applications.

7. Yellow: May indicate special compounds, such as polyurethane, which are known for their wear resistance and strength.

8. Metal Detectable O-rings: These O-rings are infused with metal detectable materials and are often blue. They are used in the food and pharmaceutical industries where contamination by foreign objects is a critical concern.

It's important to note that these color associations are not universal and can vary between manufacturers. The color alone should not be relied upon to determine the material or suitability of an O-ring for a specific application. Always refer to the manufacturer's specifications or consult with a Canyon Components engineer when selecting an O-ring for a particular use.
To determine the heat resistance of an O-ring, it is crucial to identify the material it is made from and consult the manufacturer's specifications or datasheets to ensure that it meets the temperature requirements of your specific application. The color alone should not be used as an indicator of heat resistance.

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