Compression Set Data
When referring to the compression set of Teflon™ Encapsulated O-Rings produced by M-Cor Inc. Basically, the compression set represents the anticipated loss of rebound or “memory” of a seal under use and over time. The measurement involves compressing an O-ring sample between flat plates, then heating it for a specified period of time. Upon removal, the compression set is measured by determining the thickness ratio that doesn’t recover, as a percentage.. For those interested in more detail, you can view the complete analysis at the Compression Set Blog [Click Here].
Additionally, an understanding of the compression set is important because this relates to the long-term performance of the seal.
As a result, for applications needing a good sealing force and long-term performance, choosing a material with a low compression set is crucial. During the heating process of the test, operating conditions that the O-ring will face in real life are simulated. Thus, the result measures the true durability of an O-ring. This percentage provides engineers with a clear metric to compare different materials and designs, aiding in decision-making for optimal seal performance. In short, the theory of compression set is fundamental to designing and selecting Teflon™ Encapsulated O-Rings. By understanding and measuring it in detail, M-Cor Inc. ensures its seals are reliable and effective for a wide range of applications.. Check out all the analysis at the Compression Set Blog [Click Here].
Compression Set Data and Cross Section Squeeze:
In general, cross-section squeeze is the act of reducing the cross-section of the seal. It occurs because the depth of the gland is less than the diameter of the seal’s cross-section. For a static seal, it is normally recommended to achieve 20-25% squeeze considering maximum gland fill. This specific range ensures both the sealing footprint and the sealing force are adequate to the application requirements. For dynamic seals, a little lower percentage of squeeze is suggested: from 12% to 18%. This is to minimize friction and abrasion, hence improving the performance and life of the seal. The percent-squeeze is systematically calculated using the following formula:
SQUEEZE FORMULA:
Squeeze % = [(O-ring Cross Section – Groove Cross-Section) / (Seal O-ring Cross-Section)]. In developing a good sense for the term, one must understand that cross-section squeeze is an important parameter for the seal to effectively function. Naturally, a reduction in gland depth results in the compression of the seal, hence creating a proper seal.
To significantly reduce the chances of leakage, a very vital aspect for the reliability of any such application, it maintains the recommended squeeze percentages for static seals. In dynamic seals, the lower intended squeeze percentage results from the need for effective sealing and the necessity to reduce wear and tear. This balance ultimately contributes to the seal’s longevity and efficiency. By contrasting static and dynamic seals, it becomes evident that one must optimize the squeeze percentage based on the demands of each application. This systematic calculation of the squeeze percentage, demonstrated through the formula, accurately meets sealing demands. By observing these principles, we achieve the best combination of sealing force and strength, ensuring the seal’s effective function under all operational conditions.Click Here for Compression Set Blog.
GLAND VOLUME FILL FORMULA
Gland Volume Fill is defined as the percentage of total gland volume that will be occupied by any combined or compressed seal. Ideal Gland Volume Fill Percentage (%), Static Application 85-90%, Dynamic 80-85%.These ranges are recommended because they make allowance for tolerance variations, thermal expansion and fluid volume. In addition, they stop the seal moving in its gland. The formula for gland fill is O-Ring Volume/ Groove volume x 100 % = Gland Fill %. This helps to maintain efficient performance and longer life for the seal in multiple application cases..Click Here for Compression Set Blog.
