If you have ever visited a plywood shop, you’ve probably seen big numbers stamped on the sheets — IS 303 and IS 710.
The shopkeeper may have even told you:
“Madam/Sir, this is ISI plywood.”
But what does that really mean? And more importantly…
which one should you use for your home furniture?

First Things First – What Is an IS Code?

In India, plywood quality is certified by Bureau of Indian Standards (BIS).
They create “IS Codes” which are basically quality rulebooks.

If a plywood sheet follows the rules in the code, it can proudly carry the stamp:

• IS 303 or
• IS 710

Think of the IS code like a health report of plywood.

What IS 303 Actually Means

IS 303 is the standard for:

• Commercial plywood (MR grade)
• BWR plywood (Boiling Water Resistant)

It is mainly meant for areas that don’t stay wet all the time.

If a plywood has IS 303:

It means it has passed tests for:

• Basic moisture resistance
• Some boiling water exposure
• Moderate strength
• Resistance to normal household conditions

This is the plywood used in most indoor furniture in India.

Is IS 303 waterproof?

No.
It has some water resistance, especially BWR grade, but it is not made to survive long-term water contact.

What IS 710 Actually Means

IS 710 is the standard for:

Marine Grade Plywood (BWP)

BWP = Boiling Water Proof

This is the top-most grade of plywood for water resistance.
If a plywood has this stamp, it means it has survived tough tests like:

• Being boiled in water for hours
• Long exposure to moisture
• Strong bonding tests
• Humidity and temperature stress

This is designed for wet or risky areas, especially kitchens and bathrooms.

Is IS 710 waterproof?

Yes , fully waterproof.

Strength & Durability – Who Wins?

IS 303 plywood

• Strong enough for normal furniture
• Safe for dry areas
• Good for wardrobes, beds, wall units

IS 710 plywood

• Much stronger
• Bonding is far superior
• Designed for rough kitchen conditions
• Handles heat + water + steam

 

Where Should You Use IS 303?

Most homeowners overspend on plywood because they think everything should be waterproof.
Not true.

IS 303 works wonderfully in:

• Wardrobes
• TV units
• Book shelves
• Bedroom furniture
• Crockery units
• Study tables
• Loft storage
• Wall panels

These areas don’t see water every day.
You can safely save money here without compromising quality.

Tip:

Always prefer BWR grade (IS 303) over MR grade.

Where Should You Use IS 710?

There are places in your home where water, steam, or moisture is a daily guest.

Use IS 710 for:

• Kitchen under-sink cabinet
• Cabinets near the stove
• Cabinets near the dishwasher
• Washbasin counters
• Bathroom vanity units
• Any furniture touching damp walls

For the kitchen, especially:

• One small leak from the sink
• One day of pipe sweating

The Cost Difference – Is IS 710 Really Worth It?

Yes, IS 710 costs more.
But think of it like an insurance policy.

IS 303 price:

Medium
Good for 70% of the house

IS 710 price:

Higher
Needed only for specific areas

IS 303 = Everyday plywood for normal furniture

Reliable, affordable, safe for dry areas.

IS 710 = Heavy-duty waterproof plywood

The best choice for kitchens and bathrooms.

If someone tells you:
“Use IS 710 everywhere,”
they’re either selling or they don’t know practical carpentry.