US Trends

what is porcelain made of

Porcelain is made primarily from kaolin (a white china clay) mixed with feldspar and quartz (or similar silica-bearing minerals); the blend is shaped and fired at very high temperatures so the body vitrifies into a hard, white, often translucent ceramic.

Core ingredients

  • Kaolin (kaolinite) — the pale, plastic clay that gives porcelain its whiteness and shape-holding during firing.
  • Feldspar (or petuntse/china stone) — a feldspathic material that melts during firing and acts like a glassy binder, producing vitrification and translucency.
  • Quartz (flint) or other silica — controls shrinkage and adds strength and rigidity to the fired body.

Major types and how formulas differ

  • Hard-paste (true) porcelain uses kaolin + petuntse (feldspathic rock) and is fired at very high temperatures (around 1,300–1,450 °C). This is the traditional Chinese recipe and yields the strongest, most vitrified body.
  • Soft-paste porcelain is an early European imitation that substitutes ground glass or other fluxes and fires at lower temperatures (≈1,200 °C); it’s usually less hard and less durable.
  • Bone china includes bone ash (calcined animal bone) with kaolin and feldspar; bone ash increases whiteness, translucency, and mechanical strength.

How it’s made (brief process)

  • Raw minerals are ground and mixed with water to form a workable clay body or slip.
  • The object is shaped (throwing, casting, pressing), dried, and bisque-fired to harden it.
  • A glaze may be applied, then a high-temperature final firing (glost firing) vitrifies the body and glaze into a dense, non-porous material.

Practical differences and uses

  • Porcelain is non-porous, heat-resistant, and often translucent; that makes it suitable for tableware, decorative ware, electrical insulators, dental prosthetics, and tiles.
  • Bone china is prized for extra translucency and whiteness; soft-paste is more collectible/historical but less durable than hard-paste.

Short example formula (typical hard-paste proportions)

  • Rough guideline: ~50% kaolin, ~25% quartz, ~25% feldspar (ratios vary by manufacturer and desired properties).

Bottom note: Information gathered from public sources and museum/industry descriptions. Would you like a simple HTML table comparing hard‑paste, soft‑paste, and bone‑china compositions?