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Material World
Element · Pb

Lead

Soft, dense, easily worked, and quietly poisoning people for three thousand years.

Lead melts at a temperature a wood fire can reach, is soft enough to shape by hand and resists corrosion, which made it the obvious material for plumbing — the word itself comes from plumbum. Roman water systems, medieval roofing and twentieth-century paint and petrol all used it heavily.

It is also a cumulative neurotoxin with no known safe exposure level, particularly damaging to developing brains. Removing lead from petrol produced measurable declines in population blood-lead levels within a few years, and the case is among the clearest examples of a material whose costs took centuries to become legible.

Uses

Lead's uses are contracting under regulation, and what remains is concentrated in one application: the lead-acid battery, which still starts nearly every car with an internal combustion engine and provides backup power for telecommunications and data centres. Lead-acid is heavy and old technology, but it is cheap, tolerant of abuse and recycled at a higher rate than almost any other manufactured product.

Its other surviving uses exploit density and softness: radiation shielding in medical and nuclear facilities, sound damping, roofing flashing and cable sheathing. Lead has been removed from petrol, paint and plumbing solder in most countries, and those removals are among the clearest public health wins of the last fifty years.

Medium confidence Weak evidence

How we know: checked recently · only one source, so there is nothing to cross-check it against · stated directly by the source.

How this connects

Where a connection has been confirmed by an outside reference, that reference is named beside it.

is an alternative to

  • Bismuth — element · the standard non-toxic replacement in solders and weights
  • Tin — element · in solder: lead-free solders are tin-based, melt hotter, and were adopted under regulation rather than on performance
  • Tungsten — element · as a dense material for weights, shot and shielding, and adopted for being non-toxic rather than for performing better — the same reason bismuth replaced it in solder

is used as

  • Battery electrodes — application · lead-acid cells, which account for most lead consumption and are heavily recycled
  • Pigment — application · white lead and chrome yellow, both withdrawn

is associated with

  • Bronze Age — event · lead was smelted alongside copper from the earliest metallurgy

is a source for

  • Thallium — element · and from lead smelting, by the same route
  • Silver — element · most silver reaches the market as a by-product of lead mining rather than from silver mines, recovered from the refinery's residues
  • Bismuth — element · separated during lead refining, which is where essentially all of it comes from — bismuth ores exist and are not worked
  • Antimony — element · partly from lead ores, though antimony differs from the rest of this list in also being mined for itself from stibnite

is produced by

  • Roasting — process · as the oxide, from galena, by the same route

is extracted from

  • Galena — mineral · nearly all the world's lead, and historically worked as much for the silver it carries Wikidata
  • Vanadinite — mineral · and locally a lead ore, being a secondary mineral of weathered lead deposits Wikidata
  • Wulfenite — mineral · as with vanadinite, a secondary mineral of the oxidised zone above a lead deposit Wikidata

is a component of

  • Solder — alloy · 0–40% · in the traditional alloys, at 37% for the eutectic that melts and freezes at a single temperature — withdrawn from electronics by regulation
  • Pewter — alloy · 0–30% · in historic pewter and not in modern, sometimes in quantity — the difference between the grades was a matter of guild regulation and recurring prosecution

is found in

  • Babbitt metal — alloy · 0–85% · the matrix of the lead-based grades, which are being displaced by regulation rather than by performance
  • Amazonite — mineral variety · in traces, and the colour depends on it together with water in the structure
  • Galena — mineral Wikidata
  • Vanadinite — mineral Wikidata
  • Wulfenite — mineral Wikidata

is used in

  • Stained glass window — object · the cames holding the pieces, soft enough to work around irregular shapes and to move with the panel

is commonly confused with

  • Pencil — object · there is none in one and there never has been. Borrowdale graphite was assumed in the 1500s to be a lead ore and called plumbago and black lead, and the name outlived the mistake by two hundred years

Sources

  • Material World
    Our own writing
  • Wikidata
    Wikimedia Foundation · Creative Commons CC0 1.0 Universal (public domain dedication)
  • PubChem
    US National Library of Medicine · Mixed — aggregated third-party content, rights retained by depositors
  • NIST — National Institute of Standards and Technology
    United States Department of Commerce · US Government work — public information, credit requested

Questions this page answers

Where it comes from, and what it becomes

Follow Lead back to what it starts as, and forward into what it becomes. Each step is a documented one — a real route material takes, not a chain of inference.

Upstream — what it comes from

  • Lead → is produced by (as the oxide, from galena, by the same route) → Roasting → takes as input (a copper sulfide; roasting drives off the sulfur that would otherwise prevent reduction) → Chalcopyrite
  • Lead → is extracted from (nearly all the world's lead, and historically worked as much for the silver it carries) → Galena
  • Lead → is extracted from (and locally a lead ore, being a secondary mineral of weathered lead deposits) → Vanadinite
  • Lead → is extracted from (as with vanadinite, a secondary mineral of the oxidised zone above a lead deposit) → Wulfenite
  • Lead → is produced by (as the oxide, from galena, by the same route) → Roasting → takes as input (roasted for its sulfur as much as for its iron) → Pyrite
  • Lead → is produced by (as the oxide, from galena, by the same route) → Roasting → takes as input (roasted to the oxide, the sulfur going to an acid plant rather than the air) → Galena

These are the most distinct paths back. Lead can be traced through others besides.

Downstream — what it becomes

  • Lead → is a source for (most silver reaches the market as a by-product of lead mining rather than from silver mines, recovered from the refinery's residues) → Silver → is a component of (a few per cent in the lead-free alloys, which measurably raised world silver demand when the transition happened) → Solder → is used in (every joint on it, and tin-silver-copper since RoHS pushed the lead out from 2006) → Printed circuit board → is used in (and it is the change that made electronics manufacturable: assembly stopped being a wiring job and became a printing one) → Electronics manufacture → is associated with (and the supply chain it produced is the deepest and most concentrated in the world economy) → The semiconductor era complete chain
  • Lead → is a component of (in the traditional alloys, at 37% for the eutectic that melts and freezes at a single temperature — withdrawn from electronics by regulation) → Solder → is used in (every joint on it, and tin-silver-copper since RoHS pushed the lead out from 2006) → Printed circuit board → is used in (and it is the change that made electronics manufacturable: assembly stopped being a wiring job and became a printing one) → Electronics manufacture → is associated with (and the supply chain it produced is the deepest and most concentrated in the world economy) → The semiconductor era complete chain
  • Lead → is associated with (lead was smelted alongside copper from the earliest metallurgy) → Bronze Age complete chain
  • Lead → is a source for (partly from lead ores, though antimony differs from the rest of this list in also being mined for itself from stibnite) → Antimony → is a component of (the principal hardener in modern pewter) → Pewter → is used as (the reason it existed: cast cheaply on a domestic hearth, cleanable, and recastable when it dented — the tableware of ordinary European households for five centuries) → Tableware and vessels
  • Lead → is a source for (and from lead smelting, by the same route) → Thallium → is used as (thallium-201 as a cardiac imaging tracer) → Medical imaging
  • Lead → is a source for (separated during lead refining, which is where essentially all of it comes from — bismuth ores exist and are not worked) → Bismuth → is used as (in low-melting alloys, and as the non-toxic replacement for lead in solders, free-machining brass and fishing weights — an element most people have also swallowed, as the subsalicylate taken for indigestion) → Alloying

These are the most distinct paths onward. Lead ends up in others besides.