The HSN (Harmonised System of Nomenclature) code for sunmica, a type of laminated sheet commonly used for surface finishing in furniture, falls under heading 3921. This heading includes Other plates, sheets, films, foils and strips of plastics.
Here is a description:
39: Plastics and products thereof
21: Other plates, sheets, films, foils and strips of plastics
Specifically, sunmica and similar laminated sheets can be classified under:
3921.90: Others
For GST purposes in India, the GST rate for goods classified under HSN code 3921.90 is generally 18%.