3819.00.00.90 - Other

This HTS classification covers prepared liquids specifically designed for hydraulic transmission systems, excluding those primarily composed of petroleum oils or oils derived from bituminous minerals. These fluids are formulated to transmit power and lubricate components within hydraulic systems, such as those found in vehicles, industrial machinery, and specialized equipment. The key characteristic defining this category is its formulation, which deviates from the higher percentage of petroleum-based oils found in other related classifications.

Within the broader scope of hydraulic transmission fluids, this category is distinct from hydraulic brake fluids. While both are hydraulic fluids, their specific applications and formulations differ significantly. Brake fluids are engineered to withstand high temperatures and pressures associated with braking systems, often incorporating different chemical additives for viscosity control, corrosion inhibition, and compatibility with rubber seals. This "other" category encompasses hydraulic transmission fluids that do not meet the specific requirements or primary composition of brake fluids.

As a leaf node, this classification does not have further subdivisions. Therefore, the classification hinges on accurately identifying the fluid's intended use as a hydraulic transmission medium and verifying that it does not predominantly consist of petroleum oils or oils obtained from bituminous minerals, nor does it qualify as a hydraulic brake fluid based on its composition and performance characteristics. When classifying, consider the product's technical specifications, intended application, and the manufacturer's stated purpose.