When it comes to large-scale construction—bridges, flyovers, tunnels, dams, or even high-rise buildings—the quality of shuttering plywood can make or break the project. Shuttering isn’t just about providing temporary support; it determines the finish, strength, and durability of the concrete structure.
This is where IS:4990 (2011) comes in. It is the Indian Standard that defines the specifications for plywood for concrete shuttering work, ensuring that builders and engineers can rely on consistent, durable, and safe materials. Let’s understand why this standard is critical and how it elevates the performance of shuttering plywood like Plystory’s Red Shuttering Plywood.
What is IS:4990?
IS:4990 is the Bureau of Indian Standards (BIS) specification for shuttering plywood. It was first introduced in 1993 and revised in 2011 to match evolving construction demands. This standard lays down requirements for:
- Material quality – hardwood species, resin type, density.
- Manufacturing process – pressing conditions, bonding, film overlays.
- Performance tests – water resistance, bending strength, load-bearing ability, reusability.
If a plywood board carries the IS:4990 certification, it has been tested and approved for safe, repeated use in concrete shuttering.
Why IS:4990 Certification Matters
1. Structural Safety
Concrete formwork carries the entire load of wet concrete until it sets. If plywood fails, the structure may collapse. IS:4990 ensures the board has the necessary strength and stiffness to carry these loads safely.
2. Concrete Finish
Shuttering directly impacts the final surface of the concrete. Certified plywood offers a smooth, uniform finish, reducing the need for plastering or rework.
3. Reusability
IS:4990 tests for repeated cycles of use—15 to 20 or more depending on care. This makes certified plywood cost-effective in the long run compared to non-standard alternatives.
4. Water and Weather Resistance
The standard requires phenol bonded, boil-proof plywood that resists delamination even in wet conditions. This is critical for outdoor projects like dams or flyovers exposed to rain and humidity.
5. Consistency and Reliability
With uncertified plywood, quality varies widely between batches. IS:4990 guarantees uniform quality, so contractors don’t face surprises mid-project.
How IS:4990 is Tested
To meet IS:4990 standards, shuttering plywood must undergo rigorous testing, including:
- Boiling water tests for bond strength.
- Static bending tests to check load capacity.
- Impact and vibration tests to simulate site conditions.
- Edge and core inspection to ensure no gaps or weak spots.
Only boards that pass all tests receive IS:4990 certification.
Red Shuttering Plywood & IS:4990
Plystory’s Red Shuttering Plywood is manufactured to meet IS:4990 standards. Here’s what makes it stand out:
- Made from 100% Meghalaya hardwood species for superior strength.
- Phenol formaldehyde bonded for complete waterproofing.
- Red film coating on both sides for smooth concrete finishes.
- No core gaps, ensuring uniform load distribution.
- Reusable 15–20 times or more with proper handling.
This combination makes it ideal for bridges, tunnels, dams, flyovers, high-altitude structures, and industrial projects where safety and durability are non-negotiable.
Final Thoughts
In construction, cutting corners on shuttering plywood can lead to costly mistakes. IS:4990 is more than just a number—it’s a guarantee of safety, performance, and reliability. By choosing plywood that meets this standard, builders ensure better concrete finishes, longer service life, and cost savings through reusability.
For contractors and engineers who demand both strength and consistency, IS:4990 certified shuttering plywood is the only way forward.
