Metal Insulation Washers

Metal insulation washers can adopt a structure of multiple layers of stainless steel sheets stamped and stacked. Each layer is supported by evenly distributed micro-protrusions. Closed air gaps are retained between layers, and the thermal insulation effect is achieved by relying on the low thermal conductivity of air. According to the ASTM C518 steady-state heat flow meter test, the equivalent thermal conductivity of the structure is about 0.15 Watts per meter per Kelvin, and when the total thickness of the gasket increases from 0.5 mm to 1.0 mm, its in-plane thermal resistance can increase by about 30%. This is because the increase in the thickness of the air gap weakens the heat convection path. At the same time, according to the ASTM E9 normal temperature compression test, the overall height change of the gasket under the action of preload force is less than 0.05 mm. The bump contact between the multi-layer metal sheets can effectively transfer the load without crushing the air layer, ensuring that the thermal insulation performance remains stable during the bolt tightening process. It is especially suitable for precision instrument mounts that require both lightweight and low heat leakage.

For chemical corrosion and friction control scenarios, the gasket is made of 316L stainless steel base material and coated with polytetrafluoroethylene or nickel-based alloy composite coating to resist acid and alkali media erosion and improve the assembly process. According to the ASTM G31 metal material immersion corrosion test method, after being continuously immersed in a sulfuric acid solution with a mass fraction of 10% for 720 hours, there is no pitting or peeling on the surface of the gasket, and the mass loss rate is less than 0.1%. Its corrosion resistance is far better than that of ordinary uncoated stainless steel. In addition, according to the DIN 946 fastener friction coefficient measurement standard, the friction coefficient of the bearing surface on the coated surface is as low as 0.12, which is about one-third lower than the uncoated 0.18, which can effectively reduce the dispersion of tightening torque. At the same time, the coating and threads are matched to reduce the risk of seizure. This combination makes the gasket suitable for corrosive environments such as chemical reactors, electroplating tanks, and offshore platforms. It not only isolates heat conduction, but also ensures long-term connection safety.

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