♦♦ ♦♦ Difference between calcium silicate board and gypsum board

Difference between calcium silicate board & gypsum board

  Calcium Silicate Board Gypsum Board (Drywall)
Fireproof A1 B
Evaluation Excellent Weak
Waterproof Soak in water 30 days, no change Waterdamage, strength degradation
Evaluation Excellent Weak
Density 1.3—1.5 g/cm2 1.2—1.3 g/cm2
Impact Resistance ≥3.5KJ ≤1KJ
Flexural Strength ≥14MPa ≤9MPa
Plasticity Decorative for tile, wall paper, paint, etc directly Can't decorated with tile, wallpaper, paint directly
Environmental Asbestos free Chalking


Calcium silicate board


Gypsum board

What is Calcium Silicate Board

Calcium silicate is a white free-flowing powder. It can be derived from naturally occurring limestone and diatomaceous earth, a siliceous sedimentary rock. It has a low bulk density and high physical water absorption.

Passive fire protection

High performance calcium silicate boards retain their excellent dimensional stability even in damp and humid conditions and can be installed at an early stage in the construction program, before wet trades are completed and the building is weather-tight. For sub-standard products, silicone treated sheets are available to fabricators to mitigate potential harm from high humidity or general presence of water. Calcium silicate passive fire protection board being clad around steel structure in order to achieve a fire-resistance rating.

High temperature insulation

Calcium silicate is commonly used as a safe alternative to asbestos for high temperature insulation materials. Industrial grade piping and equipment insulation is often fabricated from calcium silicate.


Calcium silicate board sheets


Gypsum board ceiling

What is Gypsum Board/ Drywall

Gypsum board is a panel made of calcium sulfate dihydrate (gypsum) with or without additives and normally pressed between a facer and a backer (typically thick sheets of paper). It is used to make interior walls and ceilings. The plaster is mixed with fibre (typically paper and/or fibreglass), plasticizer, foaming agent, and various additives that can decrease mildew, increase fire resistance, and lower water absorption.

Fire resistance

A wallboard panel consists of a layer of gypsum plaster sandwiched between two layers of paper.
As its chemical formula shows, gypsum contains chemically combined water (approximately 50% by volume). When gypsum panels are exposed to fire, heat is absorbed as a portion of the combined water is driven off as steam. This chemical process is called calcination. The thermal energy that converts the water to steam is thus diverted and absorbed, keeping the opposite side of the gypsum panels cool as long as there is crystalline water left to be converted into steam or until the gypsum panel is breached.

Water damage and termites

Gypsum will soften with exposure to moisture, and eventually turn to a gooey paste with prolonged immersion, such as during a flood. During such incidents, some or all of the drywall in an entire building may need to be removed and replaced. Furthermore, the paper facings and organic additives mixed with the gypsum core are food for mold.


Gypsum board drywall cracks


Fire resistance ceiling


Water damage and termites

Lightweight wall panel adopts calcium silicate board as double sides face boards to enhance the fireproof, waterproof and heat insulation properties.


Calcium silicate board wall sandwich panel


Calcium silicate board room partition

Fire-resistance rating test;

Thermal Conductivity;


R-value (Insulation);