China's spiral wound gasket industry has gradually matured alongside the advancement of heavy industries. In the 1980s and 1990s, demand for high-pressure equipment in industries like petrochemicals and power generation spurred mass production. Early products, typically carbon steel strip wound with asbestos tape, only met basic sealing needs under moderate pressure and temperature conditions. However, they posed environmental concerns (asbestos) and suffered from inadequate high-temperature sealing stability.

Since the turn of the century, stricter environmental policies and the upgrade of high-end equipment such as hydrocrackers and ultra-supercritical power plants have driven the industry's transformation toward non-asbestos, high-strength composites. Metal strips upgraded to corrosion-resistant alloys (304/316L stainless steel, Inconel). Non-metallic filler replaced with environmentally friendly materials like flexible graphite and PTFE. The spiral wound structure—V-grooved metal strip providing elasticity and resilience, combined with non-metallic filler for sealing—achieves reliable sealing under high pressure and temperature.

In recent years, the development of cutting-edge fields like nuclear power and deep-sea equipment, coupled with the evolution of standards, including GB/T 4622 (spiral wound gaskets for pipe flanges), is driving the industry toward more precise winding processes, multi-layer composite reinforcement, and extreme-condition customization.

Today, China is a leading global producer of spiral wound gaskets, covering all types: basic, with inner ring, with locator ring (centric/outer ring), suitable for critical equipment like shell-and-tube heat exchangers, reactors, and steam turbines—widely used in high-end industrial applications such as petrochemical refining, nuclear power, and advanced manufacturing.

We have set up a dedicated composite sealing testing team. Based on equipment pressure rating, media characteristics (hydrogen environment, strong acids/alkalis), and temperature range, we provide customized testing services—including seal leakage rate, winding layer bonding strength, and elastic recovery—to help secure sealing integrity in high-pressure equipment.