Water is notoriously difficult to seal dynamically because it lacks the natural lubricity of hydraulic oil and can cause certain elastomers to swell. Our seals are molded from a highly cross-linked, high-density Nitrile Butadiene Rubber (NBR) specifically formulated for aqueous environments. This compound prevents water absorption and resists the localized cavitation damage that often destroys lesser seals. Operating reliably in temperatures up to 90°C, this specialized NBR matrix provides a low-friction interface that significantly reduces heat generation at the seal lip, thereby extending the overall service life of the pump.

From a maintenance engineering standpoint, the leading cause of premature water seal failure is “dry running” during initial pump commissioning. When installing the 18x32x5.5mm seal, it is critical that the dynamic lip is pre-lubricated. While water is the pumped media, a light coating of silicone grease or a dedicated assembly fluid should be applied to the shaft and seal lip before startup. Additionally, the shaft surface finish must be meticulously maintained—ideally between 0.2 and 0.4 μm Ra. A scratched or heavily oxidized shaft will act like a microscopic file, rapidly shredding the NBR lip regardless of its pressure rating.