Fenske Spiral is a type of chemical packing made from metal wire, similar in appearance to a spring, and is also known as triangular spiral packing or triangular spring packing.

The characteristic of this packing is that each loop is triangular rather than circular, with the triangles in adjacent loops offset by a certain angle, forming a polygon when viewed from the end.

This design gives Fenske Spiral packing a high separation efficiency, but also results in relatively higher resistance.

Fenske Spiral packing is mainly used in laboratories, especially in the nuclear industry for the separation and purification of isotopes.

Due to its high efficiency and applicability, Fenske Spiral packing has been widely used in laboratory research.

The specifications of Fenske Spiral packing are as follows:

Size: Edge length × Height, such as 1.5×1.5, 2×2, 3×3, 4×4, etc.

Specific surface area: The specific surface area varies with different sizes of packing. For example, the specific surface area of 1.5mm packing is 3500.

Voidage: The voidage also varies with different sizes of packing. For example, the voidage of 1.5mm packing is 80%.

Bulk density: The bulk density also varies with different sizes of packing. For example, the bulk density of 1.5mm packing is 1.5kg/L.

Height equivalent to a theoretical plate (H.E.T.P.): Approximately in the range of 25–58mm.

Number of theoretical plates: Up to 45 plates per meter.