HSN Code 3820 refers to "Anti-freezing preparations and prepared de-icing fluids (excluding prepared additives for mineral oils or other liquids used for the same purposes as mineral oils)." This classification code is essential for identifying chemical products used in preventing freezing and facilitating de-icing for import/export purposes based on their nature, composition, and intended use. Common products under HSN Code 3820 include ethylene glycol-based anti-freeze, propylene glycol de-icing fluids, and other specialized formulations for automotive and industrial applications. Additionally, the GST rate for anti-freezing preparations and de-icing fluids under this code supports accurate trade compliance.