Why Do Stone Jelly Come in Different Sizes? Here's the Simple Logic

If you've ever ordered stone jelly (blue metal), you've probably wondered - Why so many sizes? 6mm, 12mm, 20mm, 40mm… what's the difference?

It's not just size. Each type has a specific purpose, and choosing the right one directly affects the strength, finish, and durability of your construction.

Here's the quick, no-nonsense guide 👇

1. 6mm Jelly (¼ inch) - Baby Jelly

Where it's used:

• Floor leveling
• Hollow blocks
• Cement bricks
• Designer paver moulds
• Cement decorative castings

Why 6mm?

It's tiny, smooth, and gives a neat finish. Perfect where you need fine texture or thinner concrete sections that must set evenly.

2. 12mm Jelly (½ inch)

Where it's used:

• Paver block manufacturing
• Roadside concrete works
• Footpaths, kerbs, drains

Why 12mm?

It balances strength + surface finish. Used when you need better compaction and smoother appearance compared to 20mm.

3. 20mm Jelly (¾ inch) - The Construction King

Where it's used:

• Regular concrete (PCC, RCC)
• Columns, beams, slabs
• Footings, lintels
• Almost all structural works

Why 20mm?

This size gives the best aggregate interlock, improving the strength of concrete. It's the most widely used size for building foundations and structural members.

4. 40mm Jelly (1.5 inch)

Where it's used:

• Basement filling
• Large-volume concrete
• Road works
• Heavy-duty foundations

Why 40mm?

It's big, strong, and covers volume efficiently. Useful where you need thickness and bulk, not a smooth finish.

So How Do You Choose the Right Jelly?

Easy:

• ✔ For strength-heavy structural concrete → Go 20mm
• ✔ For smooth finish & mould works → Go 6mm
• ✔ For pavers & roadside concrete → 12mm
• ✔ For basement & road filling → 40mm

At Kattidam, we source all sizes directly from verified quarries, ensuring accurate measurements, no dust mixing, and consistent quality.