Feroform F21

The Feroform range of materials has been developed by Tenmat to offer the design engineer the chance of replacing metal-based materials with unique, non-asbestos, wearing and bearing composites capable of duplicating and, in some cases, exceeding the performance of asbestos composites. Feroform materials possess strength, durability dimensional stability and excellent wear characteristics besides exhibiting good resistance to attack by many chemicals.

The resins used have been selected for their good mechanical properties and high thermal and dimensional stability. Both organic and synthetic fibres employed for reinforcement of the resins have been selected from the many types available for their high modulus and stability in water and various chemicals.

The “F” Grade range is primarily used in dry applications whilst the “T” & “PR” Grades have been specifically designed with very low water and moisture absorption, making them ideal for use in submerged applications yet still suitable to use dry.

The addition of selected friction modifiers, such as PTFE, graphite and molybdenum disulphide, enhances the wear properties and life of the materials, enabling them to be operated at higher speeds and loads.


Cured phenolic resin matrix carrying naturally occurring fibre and incorporating graphite evenly dispersed throughout the matrix for lower friction and improved wear properties. A general wearing and bearing grade, but not normally used for fully water-submerged applications. Feroform F21 has strength, durability, dimensional stability, low friction, and excellent wear characteristics. It is particularly useful in dirty and dusty environments.


Property Unit of measure Value
Tensile StrengthMpa50
Elongation at Break%
Modulus of ElasticityMPa
Impact Strengthkj/m²6
Compressive StrengthMPa180
Shear StrengthMPa30
Shore HardnessD Scale
Co-efficient of Frictionμ0.13
Water Absorption @ 23 Deg C%1.5
Service Temperature IntermittentᵒC150
Service Temperature ContinuousᵒC130
Melting pointᵒC
Thermal ConductivityW/m.ᵒC0.2
Dielectric StrengthkV/mm
Volume ResistivityΩ.cm
Surface Resistivity
Arc ResistanceSec