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What precautions should be taken when using silicone seals?
Time:
2022-09-20 11:58
Author:
Web scraping
Silicone sealing components are manufactured in a wide range of models and specifications. Due to their simple geometry, they are easy to produce and cost‑effective. Regardless of the overall size of the silicone seal, its cross‑sectional dimensions remain very small—typically just a few millimeters—resulting in light weight, reduced material consumption, and convenient handling, as well as straightforward installation and removal. An even more notable advantage is their excellent sealing performance and broad applicability.
Silicone sealant The production‑type specification sheet, owing to its simple shape, ease of manufacture, and low cost, is well suited for applications. Regardless of the overall dimensions of a silicone seal, its cross‑sectional size remains very small—typically just a few millimeters—resulting in light weight, reduced material consumption, convenient handling, and easy installation and removal. An even more notable advantage is the excellent sealing performance of silicone seals, coupled with their broad range of applications.
Silicone seals are commonly used in water pumps. Imported silicone seals feature a simple geometry, making them easy to manufacture and cost‑effective. Regardless of the overall dimensions, their cross‑sectional size remains very small—typically just a few millimeters—resulting in light weight, reduced material consumption, and convenient handling, installation, and removal. An additional key advantage is their excellent sealing performance and broad applicability: static seals can withstand pressures exceeding 100 MPa, while dynamic seals can handle up to 30 MPa. Operating temperatures range from –60°C to 200°C, accommodating a wide variety of media. Consequently, they are extensively employed in pump design.
The seal is installed between the groove and the sealing surface, with a certain amount of compression. The resulting elastic rebound generates an initial compressive stress on both the smooth sealing surface and the groove bottom, thereby achieving a sealing effect. As the pressure of the sealed fluid increases, the deformation of the inlet O-ring also increases, leading to a higher pressure transmitted to the sealing surface and an enhanced sealing performance. This is why imported silicone seals exhibit excellent sealing capabilities.
Although silicone seals are reliable, leaks can still occur if the operating conditions are not properly observed; these typically arise under the following circumstances:
1. The groove dimensions of the sealing element are out of tolerance, particularly when the depth exceeds the specified limit, resulting in insufficient compressive deformation after installation of the imported silicone seal and compromising its sealing performance. Typically, the compressive deformation of an installed imported silicone seal should fall within the range of 18% to 22%. When the cross-sectional dimensions are large, the relative compressive deformation is smaller; conversely, when the cross-section is small, the relative compressive deformation is greater.
2. The nominal dimensions of the sealing element differ significantly from its actual installed dimensions, causing the silicone seal to operate with a reduced cross-sectional area after being stretched. This results in insufficient compressive deformation and leads to leakage.
3. During seal installation, if the sealing surface at the inlet lacks a smooth chamfer or radius, the imported silicone seals may become scratched and leak.
4. The seal material is incompatible with the sealing medium, so it fails after being corroded.
5. When sealing elements are used for too long, they age and degrade, losing their elasticity and eventually failing. Therefore, during major equipment overhauls, silicone seals are typically replaced.
In addition, the hardness of the seal and the surface roughness of the groove and sealing interface also affect the sealing performance of silicone seals.
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