Plywood is graded by how it behaves in water. MR grade — moisture resistant — is fine for a bedroom wardrobe in a dry room. BWP, boiling water proof, is what belongs in a kitchen or a bathroom vanity.
IS:710 is the Indian standard for BWP plywood. A genuine 710 board carries the ISI mark and the standard number stamped on the edge, not printed on a sticker.
The test that matters is the boil test: a 710 board survives 72 hours in boiling water without delaminating. Ask your vendor for an offcut and boil it if you want to be certain. Reputable suppliers will not object.
Weight is a rough field check. A genuine 19 mm 710 sheet of 8x4 feet weighs around 32 to 35 kg. A light sheet usually means gaps in the core.
We use 710 BWP for kitchens, bathrooms and all carcass work, and we show you the stamped edge before pressing. It costs about 18 per cent more than MR and is the cheapest insurance in the whole project.