Granite slabs are commonly fabricated at 20 or 30 mm thickness, while overall slab dimensions vary by quarry block and processing equipment. A full slab can weigh hundreds of kilograms, so handling requires specialist equipment. Available finishes include polished, honed, leathered, flamed and brushed. A black galaxy granite slab can be cut to countertops, stairs, walls, tables or architectural pieces, with CNC fabrication allowing custom sizes and openings.
Granite Slab Specifications
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Jumbo Sizes & Fabrication Planning
From Full Slab Selection to CNC Fabrication
This 280 × 140 × 2 cm Absolute Black slab weighs approximately 240.8 kg, so transport, slab storage and fabrication require specialist handling equipment. Before cutting, the fabricator should plan sink openings, seams, edge direction and final piece nesting to maximise usable yield. Leathered finishes also need to be considered when matching joined pieces because directional surface texture can become visible across seams.
Full-Size Stone
Absolute Black Granite Slab Selection
Absolute Black Granite slab selection begins with the character of dense natural granite and how the finish, slab format and thickness suit the intended fabrication. A leathered finish softens the stone into a satin-black surface with tactile depth rather than the high reflection of polished granite. Standard slabs suit many countertops and furniture pieces, while jumbo formats reduce joints across larger islands, walls or commercial surfaces. Quarry variation can still produce subtle tonal and textural differences even in visually uniform black granite, while common 16, 18, 20 and 30 mm thicknesses allow the slab to be specified around weight, span, edge treatment and structural requirements.
Size, Weight & Yield
Jumbo Black Granite Slab Fabrication Planning
The 280 × 140 × 2 cm Absolute Black granite slab weighs 240.8 kg, making cutting layout a key part of fabrication planning before any piece is removed. Position the largest countertops or panels first to minimize seams in prominent areas, then allocate offcuts to smaller returns, shelves or details; an efficient nesting plan improves usable yield and avoids creating narrow remnants that cannot be fabricated safely.
Granite Slab Thickness Options
This slab is 20 mm thick, one of the common granite fabrication thicknesses, while 30 mm stock may be selected where a heavier visual or structural specification is preferred.
Leathered Black Granite Stone Surface
The leathered finish gives Absolute Black Granite a tactile satin texture, contrasting with the stronger reflection of polish and flatter appearance of honing.
Countertop Granite Slab CNC Cutting
CNC cutting can turn the 20 mm slab into counters, stair pieces, wall panels or furniture with project-specific openings, edges and dimensions.
Product Overview
Natural Black Granite Sheet Product Details
This slab uses leathered Dense Absolute Black Granite in satin black, measuring 280 × 140 × 2 cm and weighing 240.8 kg. The 20 mm slab can be fabricated into counters, stairs, walls, tables or architectural pieces; exact commercial grade and individual fissure condition are not specified and require slab inspection.
| Bundle Identification | Bundle ID + slab sequence: ABG-LTH-B01 / S01 of 12, with matching QR/serial identity for each slab. |
|---|---|
| Slab Flatness Tolerance | Maximum approx. 2 mm face deviation beneath a 2 m straightedge across the finished slab |
| Bow Tolerance | Maximum 3 mm bow over the full slab length and 2 mm across the slab width before cutting |
| Fissure Mapping | Digital fissure map available after slab inspection, distinguishing resin-treated natural fissures from open structural cracks |
| Edge Quality Grade | Premium sawn-edge grade with continuous, structurally sound edges and no chips exceeding 3 mm inside the trimming margin |
| Factory Mesh Presence | Factory fibreglass mesh backing only where required by fissuring or handling risk; presence must be declared for each supplied slab |
| Resin Fill Presence | Resin-filled natural fissures may be present and must be identified on the slab map; open structural cracks are not acceptable |
| CNC Cutting Tolerance | Finished CNC-cut dimensions within ±1 mm, with cutout positions within ±1.5 mm of the approved digital template |
| Usable Yield Area | Net usable yield excludes a minimum 20 mm perimeter trim plus all mapped fissures, repairs, resin pockets and unacceptable inclusions |
| Crate Handling Orientation | Transport vertically on an A-frame with the finished faces protected, slabs restrained independently and lifting orientation clearly marked |
Handling & Processing
Working with a Full Absolute Black Stone Slab
Full slabs require specialist lifting equipment, vertical A-frame storage and protected contact points that will not mark the leathered face. Approve the cutting plan, seam positions and edge fabrication before processing, and keep clamps, adhesives and abrasive debris from damaging the textured finish.
Fabrication Value
Why Choose a Jumbo Granite Slab
A jumbo granite slab offers four project advantages: larger surface coverage reduces joints, generous dimensions allow more freedom for countertops and architectural panels, CNC fabrication can place openings and edge details precisely, and the full slab gives fabricators more usable area for matching components from the same stone section.
- Large Format Coverage
The 280 × 140 cm granite slab covers broad surfaces with fewer joints while allowing larger components to be cut from one piece.
- Custom CNC Cutting
CNC fabrication allows the granite slab to be cut into exact project sizes, openings and custom profiles.
- Multiple Finish Options
The slab can be supplied in polished, honed, leathered, flamed or brushed finishes to suit different architectural applications.
- Project Grade Material
Dense Absolute Black granite provides a project-grade slab suitable for precision fabrication into countertops, stairs, walls and architectural components.
Cut to Size
Custom Granite Slab Supply Options
Custom Absolute Black granite slabs can be fabricated into countertops, stair components, cladding, vanity tops and other architectural pieces using project-specific dimensions, CNC openings and edge work. For larger developments, quantities can be coordinated for project or wholesale supply, with protective packing, A-frame loading and specialist transport planned around the 240.8 kg slab weight; similar fabrication planning applies to custom furniture such as a sandstone desk.

Technical Reference
Dense Black Granite Slab Specifications
Use the slab specification table to confirm grade, fabrication allowance and approved handling method before cutting or transport is planned. These fields help you determine how much usable material is available and what lifting or support equipment will be required for safe project processing.
Product details
Specifications, care, delivery and FAQ
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Cleaning: Remove fabrication dust with a soft brush and vacuum, wash using pH-neutral stone cleaner and non-abrasive pads, rinse thoroughly and dry before inspection or sealing, treat oils with a stone-safe poultice, avoid acids metal brushes harsh solvents and sealing over moisture
Daily Care: Keep the slab vertically supported on rated racks, protect faces and edges from impact, remove dust with a soft brush, wipe stains using pH-neutral stone cleaner, keep surfaces dry before covering, avoid acids metal contact trapped moisture and unsupported handling
- Avoid flat unsupported storage
- avoid lifting from corners
- avoid metal impact on finished edges
- avoid acid rust or oil contamination
- avoid moving the slab without rated handling equipment
Maintenance: Store vertically on a rated A-frame, support the full base edge, use non-staining spacers, inspect cracks and finished edges, protect identification labels and vein orientation, move only with rated clamps or vacuum lifters
Handling: Transport vertically on a rated A-frame, use certified clamps or vacuum lifters, support the full lower edge, secure with padded restraints, protect corners and cutouts, never handle flat without engineered support
Does this leathered Absolute Black granite slab hide fingerprints, oily smudges and cleaning streaks noticeably better than the same stone in a polished finish?
A leathered Absolute Black slab generally hides fingerprints, light smudges, fine scratches and wiping streaks better than the same stone polished to a mirror finish because the textured surface breaks up reflections. Oily residue can still darken or lodge in the texture, so leathered stone is not maintenance-free. The gold or mineral character remains visible but appears softer and less reflective. Compare full-size finished samples under the project’s actual lighting, and use only a pH-neutral cleaner followed by thorough rinsing and drying.
How much trimming and fabrication allowance should be reserved around slab edges, mapped fissures, resin pockets and other defects?
Reserve at least 20–30 mm of trimming allowance around sound slab edges and considerably more wherever edge damage, mapped fissures or resin pockets occur. For this 280 × 140 cm slab, the fabricator should digitally map every defect before nesting components and preserve an additional 5–10% material contingency for cuts, breakage and pattern alignment.
Can the cut edges of an Absolute Black Granite slab be leathered to match the face texture accurately, or will there be a visible difference?
Cut edges can be leathered, but matching the factory face precisely is difficult because tooling, brush sequence, pressure and mineral exposure differ. Fabricate a sample edge from the same slab, approve it under project lighting and expect a slight texture or sheen transition unless the entire visible surface is finished together.
What water-absorption or darkening test should be performed on the dense Absolute Black Granite Slab to determine whether sealing is necessary rather than applying an unsuitable treatment automatically?
Perform a timed water-drop test on a clean, completely dry sample of the leathered Absolute Black Granite: place several water pools on representative areas, leave them for 10–15 minutes and then wipe dry. If no darkening occurs, sealing is unlikely to help; if temporary darkening appears, test a penetrating impregnator on an offcut and inspect it after full curing for haze, patchiness or colour change before treating the slab.
How should a full granite slab be racked, supported and lifted into a CNC machine without flexing, edge impact or unsafe pressure from lifting clamps?
Store and move the slab vertically on an engineered A-frame with continuous cushioned support, using a rated overhead crane, vacuum lifter or slab clamp operated by trained personnel. Keep clamps away from weak cutouts or damaged edges, use guide ropes to control rotation and support the slab throughout transfer onto the CNC bed rather than allowing it to flex horizontally.
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