Two wires sold at the same price per kilometre can differ by a factor of two in cost per wafer. Diameter, abrasive size and how evenly the wire wears decide how much material becomes kerf and how deep the damage layer runs.
Kerf is fixed by geometry; consumption is fixed by how the wire is managed — tension through the cut, feed rate, and whether the wire is used to its limit or discarded while it still cuts. Buying cheaper wire and throwing it away early is the expensive version of the same decision.
The only fair comparison is a controlled cut: same ingot, same recipe, measure kerf, TTV, Ra and metres of wire consumed per square metre. That is what a trial slice is for.
Which is why quoted tolerances in this plant come from measured trials rather than from a catalogue: a number that has not been cut is a number that has not been checked.
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