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Grey Hermes Quartz

Grey Hermes quartz slab
Size: 3200x1600mm, 3000x1400mm
Thickness: 15mm, 18mm, 20mm, 30mm
Finished: Polished face, honed on request
Application: Kitchen countertops, bathroom vanity tops, sinks, wall panels

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Product Introduction

A Grey Hermes quartz slab is a manufactured recipe rather than a quarried block, and the number a buyer has to carry forward from a job is the press batch, not the colour name. The slab is pressed from roughly 90 to 93 percent crushed crystalline quartz bound in 7 to 10 percent polyester resin with pigment, so its colour and its veining are repeatable to a recipe, which is the whole commercial argument for choosing a grey marble quartz over the natural marble it imitates. Grey Hermes quartz is a mid grey ground carrying white veining, supplied in 3200x1600mm and 3000x1400mm jumbo slabs at 15mm, 18mm, 20mm and 30mm, calibrated to +/-1mm and polished on the face as standard or honed on request. Two production controls decide whether a finished kitchen matches the sample, and neither is visible in the slab: the batch, because two press runs of the same colour code can sit a shade apart, and the cut sequence, because a book-matched pair only lines its veins up if the two slabs were cut consecutively off one run. Fabrication follows different rules from natural stone, since a resin-bound surface at this quartz content takes a knife without marking but chips at an unbuffered aperture, and cutting it dry releases respirable crystalline silica, so apertures and edge work are cut wet or under extraction.

Parameter	Specification
Product Name	Grey Hermes Quartz Slab; also quoted as grey marble quartz; brand YoYo Stone
Material and Composition	Roughly 90 to 93 percent crushed crystalline quartz bound in 7 to 10 percent polyester resin, with pigment and trace additives, pressed under vacuum and cured
Colour and Pattern	Mid grey ground with white veining; the veining is through-body rather than printed on the surface unless a printed run is supplied, and the run is stated on the order
Slab Sizes	3200x1600mm and 3000x1400mm jumbo slabs; other sizes cut from jumbo against your cut list
Thickness	15mm, 18mm, 20mm and 30mm
Thickness Tolerance	Calibrated to +/-1mm across the slab; +/-0.5mm held on a book-matched pair
Surface Finishes	Polished on the face as standard, honed on request, with the cut edge polished to match
Edge Profiles	Eased, beveled, bullnose, ogee, mitred and laminated, with a 20+20mm lamination where the top has to read 40mm
Sink Cut-out and Support	Undermount or drop-in, CNC cut from your template; internal corners radiused, and a bisected off-cut supplied for a sink support or filler strip
Faucet Holes and Backsplash	Faucet and soap holes drilled to drawing before polishing; 100mm or 150mm backsplash, or a full-height wall panel from the same press run
Density	2.35 to 2.45 g/cm3
Water Absorption	0.05% by mass or less, which is why a quartz ground does not need sealing
Compressive and Flexural Strength	190 to 220 MPa compressive and 45 to 55 MPa flexural, so the aperture rather than the span is the governing detail
Mohs Hardness	6 to 7, so a kitchen knife will not mark the face and the cut edge is the part that chips
Surface Heat Limit	A working limit near 120 to 150 °C, set by the resin binder, so a trivet is required under a hot pan
Chemical and Stain Resistance	Kitchen acids and alkalis are resisted, unlike a calcite marble; a resin-bound surface still marks under a concentrated solvent or a dye left standing
Weight per Slab and Container Load	246 kg for a 20mm slab and 368 kg at 30mm; roughly 100 slabs, about 510 m2, per 20ft in A-frames
Fabrication Note	Cut wet or under dust extraction; dry cutting a quartz slab releases respirable crystalline silica
Packing	Peel-off film over the polished face; slabs stood in A-frames fumigated to ISPM 15, with the press batch number marked on the crate
MOQ, Terms and Port	One bundle minimum, about 15 slabs; 30% deposit by T/T, balance against the B/L copy, or an L/C at sight; FOB, EXW or CIF Xiamen; samples cut from the batch

Quality Standards

Quality Control & Inspection Standards

A Grey Hermes quartz slab is the one product on this site whose colour can be promised rather than described, and the four checks below are what turns that promise into a document. Two of them belong to the press and the saw, the batch that fixes the shade and the consecutive cut that makes a pair line up, and two belong to the fabricator, the aperture that is where a quartz top breaks and the seam that a mid grey exposes. The buyer never sees any of the four in the finished kitchen, which is exactly why each one is written down and travels with the crate.

Press batch and consecutive cut

The colour and the vein are a recipe, so a job is quoted and reserved against one press batch and the batch number is written on the order, the packing list and the crate.

The aperture, the radius and the wet cut

The sink cut-out is the point at which a quartz top fails, so apertures are CNC cut to the template with radiused internal corners, a bisected off-cut is kept as the sink support rather than a strip cut from stock, and the cut and the edge work are done wet or under extraction.

The grey ground, the seam and the adhesive

Grey is the most forgiving ground for dust and light scratching and the least forgiving for a joint, so seams are set out to fall on a vein or at a unit line and the fabricator is given the layout rather than left to place them.

Calibration, film and the A-frame record

Slabs are gauged at four points to +/-1mm and checked for bow on the plate before the film goes on, since a slab that is out of gauge cannot be mitred to a 40mm face without a visible step.

Products Application

Typical Project & Application Scenarios

Kitchen countertops and islands

A Grey Hermes quartz run cut from one press batch, with the island laminated to read 40mm, the sink aperture radiused and the seams set on the vein line.

Grey quartz sink and vanity units

Undermount and drop-in basins in bathroom and utility rooms, cut to template with a bisected off-cut supplied as the sink support and the edge polished to the face.

Bathroom wall and shower panels

Full-height panels in 20mm or 30mm with the veins carried up from one run, so the panel joints land on a vein rather than mid-ground.

Commercial and hospitality fit-outs

Bar tops, reception counters and back counters in a honed face, where a mid grey reads as deliberate under low light and does not show the fingerprints a black ground does.

FAQ

Everything You Want To Know

01. How do you keep the colour and the veining consistent across a Grey Hermes quartz job?

By quoting the press batch and cutting the whole job from it. Two runs of the same colour code can sit a shade apart, so the batch number goes on the order and the crate. A book-matched pair is cut consecutively from the run.

02. Can a grey quartz sink or vanity top be cut without the aperture chipping?

Yes, if the aperture is cut properly. Internal corners are radiused, the cut and the edge work are done wet or under extraction, and we supply a bisected off-cut as the sink support. A chip at an aperture cannot be polished out.

03. Does a Grey Hermes quartz slab need sealing, and how does it handle heat and acid?

No sealer is needed at below 0.05% absorption, and the ground resists kitchen acid and alkali that would etch a calcite marble. Heat is the constraint: the surface working limit sits near 120 to 150 °C, set by the resin binder.

04. How many quartz slabs fit in a container, and how are they packed?

Slabs are filmed on the face and stood in fumigated A-frames to ISPM 15. A 3200x1600mm slab is about 246 kg at 20mm, and a 20ft takes roughly 100 slabs, about 510 m2, so weight is rarely the limit and volume is.

05. Can Grey Hermes quartz be supplied as a book-matched pair for a feature wall?

Yes, on a consecutive cut from one press run, and that is the only way the veins will mirror. We dry-lay the pair face up and photograph it before packing, and we mark the two slabs left and right on the crate.

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