GLASS GUIDE / FINISHES
Ordinary float glass is faintly green, and the colour lives in the iron in the raw batch. Low-iron glass removes most of it. Whether that is worth paying for depends entirely on where the edge of the panel will be and what is behind it.
Broward · Miami-Dade · Palm Beach
Iron oxide occurs naturally in the sand that float glass is made from, and it absorbs light at the red end of the spectrum. Looking through a pane face-on you barely notice; looking along it, through several inches of glass, you are looking through enough iron to see colour. Low-iron glass is made from a batch with most of that iron taken out — the same material, a cleaner recipe.
The green shows where you look through the thickness: the exposed polished edge of a railing panel, the vertical joint between two panels, the edge of a shower door against a white wall. It also shows in what the glass sits against. A white marble bathroom, a pale limestone terrace or a white-painted gallery will show the edge colour plainly. A dark stone floor and a walnut handrail will not.
The effect is not fixed — it is a function of how much glass the light passes through. A quarter-inch shower panel shows a hint of colour at the edge. A thick laminated guard, which is two plies plus an interlayer, shows far more of it, and a stack of panels at the corner of a terrace shows it most of all. The heavier the glass the job needs, the more low-iron changes the result.
Low-iron glass is a category, not a brand, and the names that appear on drawings are the products of different manufacturers. Starphire, Optiwhite and UltraClear all describe the same thing: float glass made from a low-iron batch. Specify it by what you want — "low-iron" — and let the fabricator name the product they can actually get, because availability in a given thickness and make-up decides this more often than preference does.
These are separate decisions and they combine. A guard can be low-iron and laminated and heat-treated at the same time — the low-iron part describes the batch the glass was made from, the laminated part describes how two plies are bonded, and the heat treatment describes how it breaks. Specifying low-iron does not change what the code asks of the panel, and it does not substitute for the laminated make-up where the guard needs one.
What the code asks for
In a dark room, against dark stone, or where the edges are hidden inside a base channel and a top rail, low-iron buys very little and still costs more. The same is true where the glass is frosted, reeded or tinted: the texture or colour is doing the work and the batch underneath it is not what you are looking at. Spending the difference on a better hardware grade is often the better trade.
Photographs will not settle this. Two samples of the same thickness, stood edge-on against the actual wall or floor in the actual daylight, settle it in about ten seconds — and if the answer is that you cannot see the difference, that is a real answer and it saves money. Ask for the samples at the thickness the project will use, not at whatever thickness is on the shelf.
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Which system suits a project depends on the surface it fixes to and how the space is used. Send photographs or a plan and we will go through the options against your own site rather than in general.
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