Definition

1. Noun:
   • A type of unrefined lead: A dense, metallic element (Pb) in a crude or impure state. Its physical hardness is a direct result of the other substances mixed within it, not from any intentional processing.
   • A specific lead alloy: A manufactured material made by combining lead with approximately 5% antimony. This alloy is intentionally created to be harder and more durable than pure lead.

Usage Examples

• Noun:
  • The old pipes were made from hard lead, which contributed to their longevity but also to water contamination.
  • For this application, you need hard lead, as pure lead would be too soft and deform.
  • The bullet casing was formed from a hard lead alloy containing antimony.

Advanced Usage

• The term is primarily technical and is used in contexts like metallurgy, plumbing, manufacturing, and ammunition. It distinguishes the material from "soft lead" (pure or nearly pure lead).
• In historical contexts, "hard lead" often refers to the impure lead produced by early smelting processes.

Variants and Related Words

• Soft lead: Pure or nearly pure lead, which is malleable and soft.
• Antimonial lead: Another term for the alloy of lead and antimony, synonymous with the second meaning of "hard lead".
• Lead alloy: A general term for any mixture of lead with other metals.

Synonyms

• (For the alloy): Antimonial lead, lead-antimony alloy.
• (For the impure form): Unrefined lead, crude lead.

Notes on Meaning

The word "hard lead" has two distinct but related meanings: 1. Material Science / Metallurgy: An alloy where lead is purposefully mixed with antimony to achieve specific properties like hardness, strength, and wear resistance. This is a designed material. 2. Mining / Refining: Unrefined lead ore or pig lead that is naturally hard due to the presence of various impurities like arsenic, copper, or antimony. This is a raw, unprocessed state.

The key common element is the presence of additional substances (antimony or other impurities) that make the lead harder than it is in its pure form.

Noun

1. unrefined lead that is hard because of the impurities it contains
2. a lead alloy that contains about 5% antimony