The way I have sized o-ring grooves is simple and seems to work real well. Keep in mind I am in an industrial maint. setting, not manufacturing. Let's look at a 1/8" dia. o-ring. It will measure .141" in diameter. I use a square nosed grooving tool and make the groove .141" wide. I calculate that 85% of the o-ring needs to be in the groove, 15% above the groove. The reason for the square groove is to allow the o-ring a place to 'squish' on installation. A round bottom groove the same size as the o-ring with no allowance for 'squish' will shear the top of the o-ring. So, 85% of .141 is .120". My groove depth will need to be .120" deep on each side of the part (.240" total depth). Be sure to measure the actual thickness of the o-ring, don't take the 1/8" at face value. This simple method has worked well for me for 45 years in a machine shop. Good luck, KQ
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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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