At Fakuma 2026, WACKER will present ELASTOSIL LR 3822 – a new oil-exuding liquid silicone rubber with coolant resistant properties – for the first time.

The new silicone rubber was specifically designed for applications in the field of e-mobility with a focus on connector seals and sealing elements in the cooling circuit of EV traction batteries.

The product was specifically developed for the manufacture of coolant-resistant sealing elements (red) in the cooling circuit of EV traction batteries. (Source: WACKER)

Molded parts made of the new liquid silicone rubber show a low compression set and high resilience. This makes it possible to manufacture sealing elements with high sealing performance.

First oil-exuding product with high coolant resistant

The new liquid silicone rubber is the first oil-exuding product that also offers high coolant resistance. Tests show that the silicone maintains most of its mechanical properties even after being stored for 1,000 hours in a glycol-water mixture at 125 °C. This becomes especially evident when examining its compression set.

In order to test the sealing performance of ELASTOSIL LR 3822, samples were stored in a glycol-water mixture at 125°C under high contact pressure. Compression set after 1,000 hours was 44 percent. This ensures that the silicone elastomer in the seal groove is sufficiently leak-proof. (Source: WACKER)

This test records the ability for rubber parts to return to their original thickness after prolonged pressure stresses. With a compression set of 44%, sealing elements made of ELASTOSIL LR 3822 have sufficient resilience to ensure a consistently high level of sealing performance in the seal groove during operation. This makes the product the ideal material for elastic seals in the field of e-mobility.

Processing benefits

ELASTOSIL LR 3822 offers processors a wide range of benefits. For example, the crosslinked elastomer continuously releases silicone oil from its surface. This creates a lubricant film that facilitates the machine assembly of molded parts significantly.

The silicone is also extremely durable and tear-resistant. After curing, the silicone rubber can be stretched by 270% without cracks or damage. Another advantage is its superior low-temperature flexibility. The elastomer retains its elasticity even at temperatures as low as 45°C.

ELASTOSIL LR 3822 has a Shore A hardness of 60, a specification commonly used in the sealing segment. Possible applications include weather packs or sealing elements in the cooling circuit of electric-vehicle batteries.

At Fakuma 2026, WACKER will also showcase a curing-free silicone rubber with self-adhesive properties, available under the name ELASTOSIL LR 5471. Click here to read more about this product.