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Silicone Sealing Design for Outdoor Equipment: UV Exposure, Rain, and Temperature Cycling
The challenges of sealing outdoor equipment stem from UV exposure, rain, dust, and daily temperature fluctuations. During the design phase, it is essential to select weather-resistant materials while also allowing for enclosure deformation, drainage, and assembly tolerances. 1. Analyze External Exposure: The levels of sun exposure, water accumulation, and pollution vary significantly across different regions and installation locations. Determine whether the unit will be exposed to direct sunlight, shade…
Storage and Shelf Life of Silicone Seals: Preventing Deformation, Contamination, and Performance Degradation
Even after leaving the factory, silicone parts may still undergo changes in appearance or performance due to temperature, light exposure, compression, and contact with other materials. Proper packaging and first-in, first-out (FIFO) management are critical to ensuring assembly quality. 1. Control the Storage Environment High temperatures, ozone, ultraviolet light, and humid conditions can increase the risk of material aging or contamination. Store in…
How to Specify Dimensional Tolerances for Silicone Parts: Shrinkage, Critical Dimensions, and Inspection Methods
Silicone is an elastic material, and dimensional results are affected by shrinkage, demolding, curing time, and measurement methods. Appropriate tolerances should be established based on functional dimensions, rather than setting all dimensions to very tight tolerances. 1. Distinguish between critical dimensions: Prioritize controlling dimensions related to sealing, assembly, and button travel; non-functional geometric dimensions may be allowed some leeway…
Causes and Solutions for Sticky Surfaces on Silicone Products: Materials, Curing, and Storage
A sticky surface on silicone parts can affect their feel, assembly, and appearance. Troubleshooting should cover material migration, curing status, surface treatment, and storage conditions, rather than relying solely on wiping. 1. Distinguish Between Types of Stickiness: The root causes of initial stickiness and stickiness that develops after storage differ; first, record the time of occurrence and the affected areas. Confirm whether it is concentrated…
How to Select the Thickness of a Silicone Sealing Gasket: Compression, Tolerance, and Sealing Surface
The thickness of a silicone seal determines the initial compression and assembly tolerance. When selecting the thickness, a comprehensive evaluation should be conducted, taking into account the housing clearance, tolerances, screw preload, and long-term rebound. 1. First, establish a dimensional chain. Selecting gaskets based solely on nominal clearance can easily lead to overlooking housing flatness and cumulative part tolerances. List the housing, grooves, and gaskets…
Design of Silicone Footpads and Shock-Absorbing Pads: Hardness, Friction, and Long-Term Compression
Silicone footpads are commonly used for anti-slip protection, cushioning, and noise reduction in equipment. Their effectiveness is determined by a combination of hardness, contact area, texture, load, and long-term compression. 1. Identify the primary function of the footpad. Since the design priorities differ for slip resistance, shock absorption, and position limiting, you should prioritize your requirements first. For slip resistance, focus on the coefficient of friction and the texture of the base surface; for shock absorption, focus on…