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Sindanyo L21

Sindanyo L21 is a well-established electrical insulation grade of Sindanyo which offers excellent mechanical properties, outstanding machinability and high dielectric strength. This grade if produced from a specially formulated blend of fibres, density modifiers and cement and is used in applications with continuous temperatures up to 250ºC.

Sindanyo L21 is often utilised as the base material in the manufacture of high voltage insulation for the switchgear industry. Its ability to be machined to tight tolerances, coupled with its excellent wear resistance, physical toughness and low thermal conductivity make it an outstanding choice for machining custom insulation components.

Density 1.9 g/cm³
Compressive Strength 95 MPa
Flexural Strength 25 MPa
Maximum Temperature 230°C
Water Absorption (24 hrs @ 23°C) 16%
Compressive Yield 3%


AG offers Sindanyo L21 in sheets measuring 1240mm x 940mm and custom component form. We can machine this high quality insulation material to suit your specific dimensional requirements and would be happy to assist with your application. For more information on Sindanyo L21, or to discuss its suitability for your application, please do not hesitate to contact your local AG branch.

For a high temperature, thermal insulation grade of Sindanyo, please consider Sindanyo H91 which is utilised in applications up to 700ºC.