HSN 3913: Natural polymers

HSN code 3913 covers: Natural polymers (e.g. alginic acid) and modified natural polymers (e.g. hardened proteins, chemical derivatives of natural rubber), n.e.c. or included, in primary forms.

After the 22 Sep 2025 reform most goods fall under 5% or 18% GST (a few sin/luxury items are 40%). We don't show an exact rate for this specific code because it isn't verified — check the CBIC rate finder or your CA, then enter that rate when you invoice.

Rates were revised in the 22 Sep 2025 GST reform (now a two-slab 5% / 18% structure for most goods, with a 40% slab for sin/luxury items). This is a reference, not tax advice — confirm the exact rate for your specific item with your CA.