Placa de gesso — história, estrutura, propriedades e usos

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Gypsum dihydrateMineral

Type X / F boardsFire

Hates leaksWater

DrywallIcon

~0.17λ

fireFamily

Placa de gesso is one of 32 materials in this atlas, grouped under fire: history, structure, measured properties, process routes, uses, safety and market — not a product catalogue.

Scores compare Placa de gesso with the rest of the atlas on strength, heat, fire behaviour, insulation, workability and circularity. They are editorial, not certificates.

Seven chapters follow. Fire and insulation claims name test families (Euroclass, ASTM E84, ISO 5660, KS F) rather than inventing a single safety number.

Introdução profunda

Deep dive: Placa de gesso

Placa de gesso (CaSO4·2H2O + paper faces) is a family of grades whose density ~700–1000 kg/m³, heat band calcines ~80–180 °C (dehydration), and fire letter A2-s1,d0 typical; core A1.

What “the material” actually is

Placa de gesso is sold as grades, not as a single substance. Chemistry CaSO4·2H2O + paper faces, density ~700–1000 kg/m³, heat band calcines ~80–180 °C (dehydration).

This atlas treats Placa de gesso as a system: mill route, coatings, tests and the cavity it sits in.

Heat, fire and insulation

Conductivity note: ~0.17 W/m·K. Insulation score 34/100 is relative to 32 entries — metals lose, VIPs and aerogels win.

Fire letter in editorial use: A2-s1,d0 typical; core A1. Do not equate A1 with “safe in a blaze” or E with “illegal”. Assemblies decide.

How it is made and used

Origin: Sackett 1894; US Gypsum 1916, United States. The process chapter follows feedstock → conversion → forming → finish → install.

Uses span buildings to defence / safety. Pairings matter: mineral-wool.

Market and circularity

Producers below are landmarks, not an endorsement ranking. Prices are bands, not live quotes.

Circularity mark 62/100. Ask which scrap, which certificate, which year.

Perfil

Resistência 24

Resistência ao calor 54

Desempenho ao fogo 92

Isolamento 34

Trabalhabilidade 90

Circularidade 62

Perguntas frequentes

Is Placa de gesso non-combustible?

Declared reaction class in this atlas: A2-s1,d0 typical; core A1. Assemblies still need resistance tests.

Does Placa de gesso insulate?

Thermal mark 34/100 versus the atlas. Conductivity note: ~0.17 W/m·K.

What is the density band?

~700–1000 kg/m³

How is it made?

Origin story: Sackett 1894; US Gypsum 1916 (United States).

Can it be recycled?

Circularity mark 62/100 — editorial, route-specific.

Typical melting or failure heat?

calcines ~80–180 °C (dehydration)

What should it be paired with?

mineral-wool: The cavity fill behind the board.

Where is it specified?

Buildings, transport, energy and consumer goods — see the uses chapter.

Ícones

Sheetrock

United States · 1916–

Sheetrock is a reference point in the public image of Placa de gesso.

Type X

United States · 1950s–

Type X is a reference point in the public image of Placa de gesso.

EN 520 Type F

Europe · 1990s–

EN 520 Type F is a reference point in the public image of Placa de gesso.

Lath and plaster contrast

Global · 19th c.

Lath and plaster contrast is a reference point in the public image of Placa de gesso.

Shaftwall C-H stud

United States · 1970s–

Shaftwall C-H stud is a reference point in the public image of Placa de gesso.

Paper face

United States · 1894–

Paper face is a reference point in the public image of Placa de gesso.

Calcination kettle

Global · industrial

Calcination kettle is a reference point in the public image of Placa de gesso.

Job-site recycling

Europe · 2010s–

Job-site recycling is a reference point in the public image of Placa de gesso.

Ligue ou desligue ícones — cada barra reescala para o líder da sua seleção.

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Confrontos

Mesma família, outras notas — escolha um duelo.

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Placa de gesso vs Fibra cerâmica

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