Manufacturing & Quality
How granite is quarried and processed for export, and the quality points to agree before ordering.
Mansehra, Khyber Pakhtunkhwa
Mansehra district is Pakistan's best known source of black granite. The stone is dense, has low water absorption and takes a deep polish.
- RegionHazara, Khyber Pakhtunkhwa
- StoneBlack granite
- PortKarachi / Port Qasim
How Granite Is Processed
Quarrying
Blocks are extracted and checked for colour, grain and cracks.
Cutting
Blocks are sawn into slabs of the required thickness.
Finishing
Slabs are polished, honed, leathered or flamed.
Cut to size and packing
Slabs are cut to size, crated and loaded.
Quality Points to Agree
Natural stone varies. These points should be agreed in writing before production.
- Colour and grain range
- Thickness and size tolerances
- Finish and polish level
- Acceptable natural marks
- Packing and labelling
Before Shipping
Photos of your slabs
Your actual slabs, photographed before packing.
Loading photos
Container loading and seal number.
Inspection
Your inspector or agent is welcome before loading.
Technical Data
Published test values for Mansehra black granite, compared with the ASTM C615 standard for granite.
| Property | Test | ASTM C615 | Mansehra black |
|---|---|---|---|
| Water absorption | ASTM C97 | max 0.40 % | 0.14 to 0.61 % |
| Specific gravity | ASTM C97 | min 2.56 | 3.11 to 3.17 |
| Compressive strength | ASTM C170 | min 131 MPa | 225 to 241 MPa |
Source: Ismaeel et al., Journal of Himalayan Earth Sciences 52 (2019).
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