Quality Standards

At Irazo Stone, quality is not just a promise. A commitment exists in every slab and tile we make. From choosing the right quarry to the final mirror finish, our strict quality standards guarantee excellence at every step.

Quality Standards of

Granite, Marble Slab & Tile

S.RClass of GraniteCategoriesPolishing ProcessSpecificationManufacturing Cost
Premium Quality GraniteA Class GraniteGrinding Grit – 16 to 80

Closing of Pores Grit – 120 to 220

Honing Grit – 280 to 400

Pre Polishing Grit – 600 to 1500

Polishing Grit – 2000 to 3000

Mirror Finish Buffing and Rubbing

Polishing Degree

Result= Gloss Unit – 85 to 98gu

High quality nano polishing gives lustrous appearance.		Fresh and Fine Blocks are taken from quarry with Zero tolerance in Irregularities, Fractures, Color Variations, Bonding of Particles and quality of stone.

Optional or If required Granite is Treated with Imported high quality epoxy and equipment’s used are of very High Precision.

Inspection Of every slab and tile for Polish, Flatness and Straightness of Edge with all instrument to maintain quality standards.

Rejection rate of slab and tile is very high due to strict Inspection.

Quality Assurance and warranty have been provided on each slab and tile

Precautionary measure – Extra slab will have provided so that, they could be used at if any mishap happens.		Very High
C Class GraniteGrinding Grit – 16 to 80

Honing Grit – 280 to 400

Pre Polishing Grit – 600 to 1500

Polishing Grit – 2000 – 2500

Polishing Degree

Result = Gloss Unit – 70 to 80 gu		Fresh and Fine Blocks are taken from quarry with Zero tolerance in Irregularities, Fractures, Color Variations, Bonding of Particles and quality of stone.

Optional or If required Granite is Treated With Imported high quality epoxy.

Inspection Of every slab and tile with all instrument to maintain quality standards

Precautionary measure – Extra slab will have provided so that, they could be used at if any mishap happens.		Economical

HOW TO USE

Abrasive

How to Use Abrasives for Granite & Marble Polishing

Granite and marble are two of the most popular natural stones in construction and design. People recognize them for their ability to achieve a high-gloss polish. People widely use these stones for wall cladding, flooring, countertops, monuments, and memorials because of their durability and elegance.

Difference Between Granite and Marble

The primary difference between granite and marble lies in their formation:

  • Marble is formed through the metamorphosis of limestone, making it a relatively soft stone.
  • Granite, on the other hand, is an igneous rock, naturally much harder and denser than marble.

This difference directly impacts the type of abrasives and polishing techniques required for each stone.

Principle of Polishing Natural Stones

The polishing process for both granite and marble follows a universal principle:

  • The surface of the stone is gradually honed using progressively finer abrasive meshes.
  • As you apply finer abrasives, the stone’s natural luster begins to emerge.
  • The result is a mirror-like polished finish that reflects light beautifully.
Reflection and Surface Quality

A well-polished natural stone slab is capable of reflecting a major portion of the light that falls on it (see Fig. 1A).

  • When someone does not hone a stone surface well, bumps form that scatter light instead of reflecting it (see Fig. 1B).
  • This scattering of light causes the surface to appear dull and lifeless, lacking the rich shine and depth that properly polished stone provides.

1. Selection Of The Sequence Of Abrasives (For Polishing Granite)

Granite polishing relies on the sequence of abrasives to achieve a flawless, high-gloss finish. The process must begin with thorough initial grinding using rough grit abrasives to make the granite surface completely flat.

Importance of Initial Grinding & Honing
  • The quality of the final polish depends on how well you level the surface during grinding and honing.
  • If the surface is uneven or pores are not closed, even the best polishing abrasives will not create the shine you want.
Common Mistakes in Granite Polishing

Many operators skip or hurry through the first two stages of grinding. They focus on using polishing abrasives to get a glossy finish. Without a strong base of flatness and pore closure, the granite surface will not achieve its true mirror-like shine.

Key Takeaway

To keep granite looking great and lasting long, you must polish it in the right order. Start with rough grits to level the surface. Then, use finer grits to hone it. Finally, finish with the finest polishing abrasives.

Stage No.ApplicationFepa Grit
1Griding16 to 20
2Closing of pores120 to 220
3Honing280 to 400
4
Pre-polishing600 to 1500
5Polishingpolishing abrasives

2. Selection Of The Bond Of Abrasives

The bond type of abrasives is crucial for achieving both quality and efficiency in granite polishing.

  • Soft bond abrasives provide faster production rates and manufacturers commonly use them for monuments and tiles.
  • Hard bond abrasives last longer. Users often use them to polish rough gang-sawn slabs. This is important because wear and tear can be high.

Choosing the right abrasive bond depends on the sawn surface condition, granite quality, and required production rate.

3. Required Polishing Pressure

Polishing pressure directly impacts the rate of material removal and the final surface finish.

  • Excessive pressure can cause burn marks, scratches, or even breakage of slabs and abrasives.
  • Hard and porous granites, such as Red Granite, need higher pressure. Softer granites, like Black Granite, require lower pressure.
  • Other influencing factors include conveyor speed, bridge speed, type of machine, and abrasive type.

4. Adequate Water Supply

Water plays a vital role in granite grinding, honing, and polishing.

  • A continuous, adequate flow of water prevents overheating, eliminates scratches, and ensures a smooth polish.
  • Use finer mesh abrasives with a fresh water supply for a scratch-free, glossy finish.

5. Machine Speed & Passes

  • In line polishing machines, belt speed must be carefully controlled. Excessive speed can result in uneven polish, dullness, scratches, or burn marks.
  • In bridge polishers, the number of passes is equally important to ensure complete grinding and uniform polishing.
Product SpecificationAll South Indian and North Indian Granite
Name of the ProductGranite Tile, Slab for Countertop and Flooring Project.
Block Size60*180*60 cm & up, 120*240*120 cm & up, 150*270*150 cm & up and can customize according to customer preference.
Gang saw Slab280*160 cm, 280*220 cm, 340*160 cm, 340*220 cm
Random Slab60*180 cm and up, 120*240 cm & up and customizable.
Cut to size30*30 cm, 30*60 cm, 40*40 cm, 40*60 cm, 60*60 cm, 60*90 cm, 70*120 cm, 70*130 cm, 70*140 cm (Size can be Customize).
Thickness10mm, 12mm, 15mm, 16mm, 18mm, 20mm, 30mm, 40mm.
Tiles305*305*10 mm, 305*610*10 mm, 457*457*12mm. customizable
FinishesPolished, Honed, Brushed, Leather, Textured, Bush hammered, Rough, Flamed.
Quality Management1, Polishing at 85 – 95 GU ( Premium polish )

Polishing at 75 – 85 GU ( Standard Polish )

Polishing at 65 – 75 GU ( Sub Standard Polish )

2, Thickness tolerance: (-1, +1mm)
3, Diagonal tolerance: ((-1, +1mm)
4 Surface flatness tolerance: (-0.3, +0.3mm)
Our products are It’s all one piece that’s been inspected enough next to one piece
Packing"Sea freight with strong wooden crates. With fumigation worthy to the
wooden crates are 2.3cm thickness, with foam and plastic for waterproof."

Stuffing Capacity for Export of Granite in 20’ Container

ProductThicknessQuantityWeight
Slab20mm

30mm		400 – 425 Sqm

270 – 300 Sqm		22000 Kg

22000 Kg
Cut to Size18mm

20mm
420 – 440 Sqm

400 – 425 Sqm		22000 Kg

22000 Kg
Tiles30mm

10mm
270 – 300 Sqm

800 – 820 Sqm		22000 Kg

22000 Kg

Container details

Container TypeOut Side DimensionInside DimensionTop openingCubic Capacity
20 Feet6.045×2.438×2.4385.90×2.35×2.387-31 cbm1,079 cu ft.
20 Feet High Cube6.045×2.438×2.5915.918×2.337×2.413- 31 cbm1,079 cu ft.
20 Feet Open Top6.045×2.438×2.4385.918×2.337×2.286L: 5.41m, W: 2.21m32 cbm1,116 cu ft

Granite capacity per container

SizeQNT. SFT.Details (20’ container)
1x1x10mm7200Packing in Thermocol & Wooden Crates,20 Pallets in Container, 1 Pallet 36 Box, 1 box 10 Pcs.
1’X1’X10MM8000Without Thermocol Packing, In Corrugates Box Packing
2’6”x8’x20mm5400Wooden Boxes and Crates
4’x12’x20mm3500Wooden boxes and Crates
5’X9’X20MM320070 SLABS
5’X9’X30MM240049 SLABS
30”x240x11MM5500275 SLABS, Each Slabs Wrap in Bubble Rap & Within two slabs full Thermocol sheet, in special wooden crate.

Weight

SizeWeight
1’X1’X10MM2.5 KG
1’X1’X20MM5.00 KG
1’X1’X30MM7.50 KG

Quality Technicals for Stone Article

NameGarden Fountain, Flower Pots and Urns, Balustrades, Tombstone & Monument
SizeAll Articles are customizable. We design all our articles on customers preference for size.
MaterialGranite, marble and sandstone.
TechnicsPolished, Honed and Antique.
AdvantageExperienced and skilled artisan will produce elegant product and we will customize it as per customer’s need.
After sale serviceOnline Technical support
Project solutionCAD Drawing given with product.
Arrival time40-60 days (15 – 20 days to produce, 25-35 days to transport) it may vary according to order.
ApplicationLast ritual, funeral decoration.
PackagingThe Articles packing ways:

1. Solid wood crates packed by 2*8 cm wooden slabs which need fumigation

2. Inside the crates with enough wood chunks or foams to support the inner products, avoid goods shaking.

3. Inside the crates with plastic film to prevent water come in.
Quality Standards1. Strict Quality control and supervision system Guarantees good quality.

2. First inspection select a grade A raw material

3. Third inspection is to checking pieces by pieces color difference control.

4. Well packed to prevent damage during long distance transport.
ColorYellow, white, black, green, beige and from our available inventory.
Dimensionsall are customizable as per your need and we leave on our customer’s requirements.