What thicknesses does low-iron glass come in?

3-19mm, matching standard float glass thicknesses.

How long does low-iron glass take to supply?

Standard lead time is 3-5 working days.

Will low-iron glass fit my existing frame or splashback fixings?

Same thickness range as standard float glass — a direct substitute.

When should I choose low-iron over standard clear glass?

For walk-on floors, balustrades, splashbacks and mirrors where a green tint would otherwise show.

Does low-iron glass need different care?

No — clean and maintain the same as standard clear glass.

Home›Glass Types›Low-Iron / Optiwhite

Low-Iron / Extra Clear Glass

Ultra-clear glass with ≤0.01% iron oxide — virtually eliminating the green tint. 91.5% light transmission. True colour rendering for splashbacks, balustrades, walk-on glass and mirrors.

≤0.01% Fe₂O₃91.5% LightNo Green TintOptiwhiteDiamant

Glass Type

Low-Iron — True Colour

Low-iron glass is manufactured with reduced iron oxide content (≤0.01% Fe₂O₃ compared to ~0.10% in standard float), virtually eliminating the characteristic green tint visible at glass edges and through thick multi-ply constructions. This provides 91.5% light transmission (vs 90% for standard 4mm clear) and true colour rendering. The difference becomes increasingly apparent with thicker glass — a 10mm low-iron pane transmits 90.5% light vs 87% for standard.

Low-iron is essential for walk-on glass floors (where multiple thick plies create noticeable green tint), glass balustrades (green edge visible at frameless edges), back-painted splashbacks (Lacobel on Optiwhite gives truest colour), and mirrors (low-iron silver gives truest colour reflection).

Standard vs Low-Iron

Property	Standard Float	Low-Iron	Difference
Iron oxide	~0.10%	≤0.01%	90% less iron
Light (4mm)	90%	91.5%	+1.5%
Light (6mm)	89%	91%	+2%
Light (10mm)	87%	90.5%	+3.5%
Edge colour	Green tint	Near colourless	No green

The edge colour difference is easy to see side by side:

Glass Clarity

Standard Float vs Low-Iron — Edge Colour Cast

Standard float — visible green edge tint

Low-iron — near-clear, minimal colour cast

Standard float glass has a natural green cast from iron oxide content, most visible at the edge. Low-iron glass reduces this for truer colour and clearer views.

Brand Reference

Manufacturer	Product	Thicknesses	Max Size
Pilkington	Optiwhite™	4-19mm	6000×3210
Saint-Gobain	Diamant®	3-19mm	6000×3210
Guardian	UltraClear™	4-12mm	5100×3210
AGC	Clearvision™	4-12mm	6000×3210

Iron Content

≤0.01% Fe₂O₃

Light (4mm)

91.5%

Edge Colour

Near colourless

Thicknesses

3-19mm

Max Size

6000 × 3210mm

Applications

Walk-on glass floors — eliminates green tint in thick layups
Balustrades — crystal-clear frameless edges
Back-painted splashbacks — truest Lacobel colour
Shower screens — premium clarity
Low-iron mirrors — truest colour reflection
Display cases / museums — no colour distortion
Solar panels — higher UV transmission

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Glass Weight per Thickness

Glass density: 2,500 kg/m³. Weight = Thickness (mm) × 2.5 × Area (m²).

Thickness	Weight/m²	600×900	1000×1200	1500×2000	Max Sheet	Toughening	Laminating
4mm	10 kg	5.4 kg	12 kg	30 kg	3210×2500	Yes	Yes
6mm	15 kg	8.1 kg	18 kg	45 kg	3210×2500	Yes	Yes
8mm	20 kg	10.8 kg	24 kg	60 kg	3210×2500	Yes	Yes
10mm	25 kg	13.5 kg	30 kg	75 kg	3210×2500	Yes	Yes
12mm	30 kg	16.2 kg	36 kg	90 kg	2800×2000	Yes	Yes
15mm	37.5 kg	20.3 kg	45 kg	112.5 kg	2400×1500	Yes	Yes
19mm	47.5 kg	25.7 kg	57 kg	142.5 kg	2000×1200	Yes	Yes