Direct Factory Supply: 58/47 Size Silicone Sealing Rings for Solar Tubes | Waterproof, High-Temperature, High-Pressure & Corrosion Resistant

I. Raw Material Specification

The special sealing rings for solar vacuum tubes are refined from premium 50-grade silicone raw materials. Featuring moderate hardness and stable performance, they are dedicated sealing materials suited for the operating conditions of solar water heaters.

50-grade silicone boasts excellent flexibility and elastic deformation capacity with well-balanced softness and hardness. It avoids laborious installation and cracking caused by excessive hardness, as well as seal collapse and insufficient rebound stemming from overly low softness.

The raw material features outstanding resistance to high and low temperatures. It can withstand extreme temperature differences in outdoor solar environments, including prolonged exposure to intense sunlight in hot weather and freezing conditions in winter, resisting aging, hardening and deformation.

It also delivers excellent water resistance, anti-ultraviolet, anti-aging and anti-corrosion properties. When immersed in hot water and scale-laden environments for long periods, it will not swell, deteriorate or get moldy. Non-toxic and odorless, it is environmentally safe with no harmful substance precipitation, fully meeting safety standards for civil hot water equipment.

In addition, the material is wear-resistant and features high tensile strength. It resists damage under repeated assembly and disassembly as well as long-term pressure, fundamentally guaranteeing the long-lasting sealing performance and service life of the sealing ring.

II. Raw Material Performance Parameters

III. Production Process

The product is entirely manufactured by compression molding with a vulcanizing machine. This mature and precise process delivers excellent consistency in quality. The whole production strictly follows standardized procedures: first, the Shore A 50 silicone raw material undergoes accurate proportioning, mixing and static maturation treatment to ensure uniform texture and consistent performance, eliminating uneven hardness and residual impurities.

Subsequently, high-precision custom molds are used for positioning. The material is formed in one step under high temperature and high pressure via the vulcanizing machine, accurately reproducing sealing rings of two standard sizes: 47 mm and 58 mm. The finished products feature neat edges, uniform wall thickness, precise roundness and zero dimensional deviation, making them perfectly compatible with solar vacuum tubes of corresponding specifications. High-temperature vulcanization fully cures the silicone material, improving compactness, resilience and structural stability, and effectively boosting resistance to aging, deformation and pressure.

After molding, multiple procedures including trimming, quality inspection and defect screening are carried out to remove defective items with burrs, deformation or material shortages. The finished products have smooth, burr-free surfaces and excellent sealing adhesion. The process precision far exceeds ordinary injection-molded products, effectively preventing faults such as water seepage, leakage and loosening after installation.

IV. Product Application Scenarios

This product is a dedicated sealing fitting for 47 mm and 58 mm solar vacuum tubes. It fits most domestic and commercial solar water heater vacuum tubes available on the market, serving as a core sealing component for solar heat collection systems with a wide range of applications.

1.Domestic Solar Water Heaters

Suitable for integrated domestic solar water heaters in rural self-built houses, residential communities and standalone buildings. It provides sealing at the joint between vacuum tubes and tank holes, filling assembly gaps to prevent tank water leakage and seepage. Meanwhile, it blocks external dust, insects and cold air, maintaining heat collection and insulation performance and avoiding heat loss.

2.Commercial Solar Heat Collection Equipment

Applied to large-scale centralized water supply solar heating projects in factories, dormitories, hotels, homestays, schools and other sites. Matched with 47/58 mm vacuum tube assemblies for mass installation, replacement and maintenance. It delivers stable pressure resistance and reliable sealing, adapting to high-frequency and long-duration continuous commercial operating conditions.

3.Maintenance & Replacement of Solar Equipment

Used as a universal replacement part to solve failures such as aging, hardening, cracking, water leakage and malfunction of old sealing rings on solar water heaters. Compatible with 47/58 mm vacuum tubes of most mainstream brands. Featuring easy installation and strong versatility, it quickly fixes water leakage and restores normal operation of water heaters.

4.Outdoor Exposed Solar Equipment

Benefiting from outstanding anti-ultraviolet, high/low temperature resistance and weatherability, it adapts to complex exposed installation environments such as rooftops and balconies exposed to direct sunlight, rain, frost and freezing. It withstands harsh outdoor weather and maintains stable performance for year-round reliable operation of solar equipment.