Tolerances in Manufacturing Process – Stone Standards

2.1

General
Cracked and obviously unsound stone shall not be processed as a stone member – carrying loads or being subjected to various weathering conditions. All stone shall be cut and surface finished within a prescribed tolerance.

2.2

Tolerances

(A)	Wall panels polished, honed, gang-sawn surface finish.
(aa)	Tolerances of length and width
	0.6 M2 and under	+ or – 1.5 mm
	over 0.6 M2	+ or – 2.0 mm
(ab)	Panels diagonals	+ or – 4.0 mm
(ac)	Flatness, twist of panels	+ or – 1.5 mm
(ad)	Note: On exfoliated surfaces adjustments on flatness and twist of panels are allowed to be made in order to suit the general plane of the finished surface. These adjustments have to be made on the edges.
(B)	Floor panels polished, honed gang-sawn, exfoliated surface finish.
(ba)	Tolerances in length and width
	0.6 M2 and under	+ or – 1.5 mm
	over 0.6 M2	+ or – 2.0 mm
(bb)	Panels diagonals	+ or – 4.0 mm
(bc)	Flatness, twist of panels	+ or – 2.0 mm
(bd)	Note: Exfoliated surfaces, flatness and twist of panels – same rule applies as with wall panels (2.2 (ad) ).
(C)	Bench Tops
(ca)	Tolerances in length and width	+ or – 3.0 mm
(cb)	Flatness, twist of panel	+ or – 1.5 mm
(cc)	Flatness, twist of panel	+ or – 1.5 mm
(cd)	Overhang tolerance – cabinet	+ or – 5.0 mm
(ce)	Thickness	+ or – 3.0 mm
(D)	Artistically Tooled Stone Members Hammered and nipped surface finish
(da)	Tolerances of length and width	+ or – 4.0 mm
(db)	Diagonals	+ or – 5.0 mm

2.3

Impurities
On gang-sawn and exfoliated surfaces – iron oxide particles causing oxidation (rust) shall be washed out using appropriate solutions for stone, appropriate to the particular stone type.

2.4

Recommended Thickness of Stone Members

(a)	Wall panels	30 mm
(b)	Floor panels	20 – 30 mm
(c)	Wall panels – exfoliated	40 mm
(d)	Bench Tops	20 – 30mm
(e)	Note: Variations in thickness does occur due to cutting and tooling methods used.

2.5

Surface Finishes

(a)	Gang-sawn finish.
(b)	Exfoliated finish – the surface shall be flame spalled to a dept to elevate cutting marks.
(c)	Glass beaded finish.
(d)	Honed finish
(e)	Polished finish – stone shall be finished to a natural gloss within a tolerance of plus or minus 15 Gloss Units [GU] from the mean average gloss measured on the panel.
(f)	Hammered finish – uniform bush hammered finish.
(g)	Diamond Wire sawn.
(h)	Block swan
(i)	Brushed
(j)	Water Jet Finish