HSN Code 3825 refers to "Residual products of the chemical or allied industries, n.e.s.; municipal waste; sewage sludge; clinical waste, waste organic solvents, wastes of metal pickling liquors, of hydraulic fluids, brake fluids and anti-freeze fluids and other wastes from chemical or allied industries (excluding wastes containing mainly petroleum oils or oils obtained from bituminous minerals)." This classification code is crucial for identifying various waste products for import/export purposes based on their nature and intended use. Common products under HSN Code 3825 include municipal waste, clinical waste, sewage sludge, waste organic solvents, and hydraulic fluids. Additionally, the GST rate for these residual products under this code supports trade compliance.