7 Proven Ways to Identify Genuine IS:710 Marine Grade Plywood

Because IS:710 Marine Grade Plywood commands a premium price due to its high-density hardwood veneers and undiluted Phenol Formaldehyde resin, dishonest suppliers frequently stamp low-grade commercial boards with fake "Marine 710" ink marks.

Using fake marine plywood in your modular kitchen or bathroom vanity can lead to swelling, mold growth, and delamination within just 12 to 18 months. Here are the 7 infallible tests used by timber engineers and quality inspectors to guarantee authentic IS:710 plywood.

1. Verify the BIS ISI Mark & 7-Digit CM/L Number

Every genuine sheet of IS:710 Marine Plywood must carry an authentic ISI mark with a distinct 7-digit CM/L (Certification Marks / License) number printed directly on the board face or edge.

• Open the official BIS Care Mobile App or visit the BIS portal (manakonline.in).
• Enter the CM/L license number displayed on the board.
• The manufacturer's name, brand name (Galant Industries), plant address, and validity status must match precisely.

2. Inspect the Core Veneer Cross-Section for Gaps

Look at the side edges of the plywood sheet. Genuine marine plywood is built using full core and full panel hardwood veneers laid symmetrically.

• Genuine 710: Solid, seamless veneer layers with zero core gaps, overlapping, or hollow cavities.
• Counterfeit: Shows visible gaps, filler putty on edges, or irregular veneer thicknesses across the layers.

3. Check the Weight and Density (Hardwood vs Softwood)

Authentic IS:710 Marine Plywood is manufactured using selected high-density hardwood species (such as Eucalyptus or Gurjan) with a density exceeding 750 – 800 kg/m³.

Lift a full 8x4 ft sheet of 18mm plywood. If the sheet feels surprisingly lightweight, it has likely been manufactured using low-density plantation poplars or softwoods that cannot withstand high moisture loads.

4. The 72-Hour Boiling Water Test (Lab Verified)

The defining gold-standard test of IS:710 is the Boiling Water Proof test. In this test, a sample piece (10cm x 10cm) is submerged in boiling water (100°C) for 72 continuous hours, followed by rapid drying.

5. Test Thickness Calibration & Surface Uniformity

Modern premium marine plywood is quad-press calibrated using digital sanders to achieve uniform thickness tolerance within ±0.1 mm across the entire 32 sq ft sheet.

Measure the four corners and the center of the sheet with a digital screw gauge or vernier caliper. If thickness fluctuates between 16.5mm and 19mm on the same sheet, it will cause uneven laminate bubbling and misaligned kitchen drawers.

6. Check the Glue Line Color (Dark Phenolic Resin)

When you cut a cross-section of authentic IS:710 marine plywood, look closely at the glue lines between the veneer plies:

• Authentic Marine: Deep reddish-brown to dark black glue lines indicating unextended Phenol Formaldehyde resin.
• Commercial Ply: Translucent, pale yellowish, or clear lines indicating moisture-vulnerable urea-based resins.

7. Insist on Manufacturer Warranty Certificate

Never rely solely on verbal guarantees from a local retailer. Authentic manufacturers provide structured warranty certificates with batch tracking numbers.

Galant Soldier 710 comes with an official 15-Year Replacement Warranty against borer and termites, while Galant Platinum BWP offers a Lifetime Warranty backed by vacuum-pressure preservative chemical impregnation.

Summary Checklist Before You Purchase

1. Check for legible IS:710 stamp and valid CM/L license code.
2. Inspect cut edges for zero core voids and uniform multi-ply structure.
3. Verify thickness with a caliper (Calibrated Plywood).
4. Ensure the dealer is an authorized distributor (Find Galant Dealers).