19/05/2026
Innovate.Educate.Enjoy
The final area I want to cover in this series is sealing and abrasion resistance. There are three main products that we utilise to seal the loom and make it more resistant to external abrasions, wear and contaminants.
Raychem DR25 is the heat-shrink that we use, this product is universally accepted as the go to when covering and sealing motorsport wiring, while sealing the wiring from the environment it also offers superior protection from chemicals and abrasions.
SCL, is a dual wall, semi-rigid, encapsulant lined heat shrink that we use internally to cover crimped splices and externally to seal the DR25 heat shrink ends and joins. When heated the encapsulant melts, when it cools it resets and seals off the area covered by the heat-shrink forming a barrier to moisture and other contaminants.
The third type of product we use are heat shrink moulded boots, these come in an extensive range of shapes and sizes, we use them to cover branch points, transitions and the wire entrance point on connectors. These boots are either encapsulant lined or used with epoxy resin to form a seal, the boot while sealing the wire will also form a rigid point adding support to wire junctions and terminals in connectors,reducing the strain on the wire and adding to the durability and longevity of a harness.
The products and methods mentioned above all combine to seal the loom, we try to limit the possibility of dirt and moisture entering the loom or any wire/terminal crimps which reduces the possibility of issues. It is difficult to fully seal a loom that incorporates OEM connectors, which is another reason why we would pot sensors, eliminating the OEM connectors and using a more robust after market connector, like a Deutsche DTM or Autosport.
