White fiber gypsum powder

Gypsum fiber(gypsum whisker, calcium sulfate whisker)

English Name: Calcium Sulfate Whisker, Abbreviation: CSW or SW;

Molecular formula: CaSO4

Variety	Feature	Performance	Application
White fiber gypsum powder	Good whiteness, high finish, high strength, high purity.	Whiteness >85%, initial setting ≥8, final setting <25, consistency 70%, flexure 8MPa, compression 18MPa.	Used in decoration, building materials, sculpture, exquisite ceramic mold.

Calcium sulfate whisker is a fibrous (whisker) single crystal with a uniform cross-section, complete shape, and perfect internal structure, which is grown in the form of a single crystal by artificial control. Its basic performance indicators are as follows:

Item	index	Item	Index
Composition of whisker	CaSO4	tensile strength（GPa）	20.5
density（g/cm3）	2.96	tensile modulus（GPa）	178
Density of looseness（g/cm3）	0.1-0.4	length（um）	20-100
diameter（um）	1-3	water solubility（22℃ppm）	1200
melting point（℃）	1450	hardness（Mohs）	3
heat resistance（℃）	1000	RI (refractive index)	1.585

Calcium sulfate whisker can be divided into two water (CaSO4•2H2O), half water (CaSO4•0.5H2O) and anhydrous (CaSO4).

Gypsum fiber is a fibrous single crystal of calcium sulfate, white loose needle, with perfect structure, complete shape, specific cross section, stable size, its average length-diameter ratio is generally 20~50. Slightly soluble in water and neutral in aqueous solution. It has the fineness of granular packing, the length-diameter ratio of short fiber packing, high temperature resistance, acid and alkali resistance, chemical corrosion resistance, good toughness, good electrical insulation, high strength, easy surface treatment, good compatibility with resin, plastic and rubber, can be evenly dispersed, pH value is close to neutral. Excellent enhanced function and flame retardant. Compared with other inorganic whisker, calcium sulfate whisker is a non-toxic green material.

A. Classification of gypsum fibers

Gypsum fibers can be divided into three broad categories.

1. Gypsum staple fiber: also known as gypsum whisker. It is mainly used in rubber, plastic, paint, binder and other industries requiring fineness below 0.3mm. The fiber length was defined to be between 0 and 300μm.

2. Long fiber in gypsum: also known as gypsum pulp. Mainly used in paper and paper products industry. The fiber length should range from 0.2 mm to 3.0mm.

3, gypsum long fiber: also known as gypsum velvet. It is mainly used in industries with high fiber length requirements. For example: heat preservation, health care, textile and so on. The fiber length should be greater than 3.0mm.

B. production technology

The production process of gypsum fiber can be divided into two types according to the different types of raw materials used.

1, chemical synthesis method: the production of raw materials for chemical materials. The advantages are high purity, and white color, but there is a large investment, high-cost problems, suitable for the lack of mineral raw materials or the need to produce high-purity gypsum fiber local tissue production.

2, mineral conversion method: the production of raw materials for natural ore chemical products. Mineral conversion method has abundant raw materials, low price, relatively low investment, low cost and strong market competitiveness, but product purity depends on raw materials, and product whiteness is significantly affected by raw materials and production equipment, so it is necessary to choose different mineral sources according to market requirements.

The main preparation methods of gypsum fiber are hydrothermal method and atmospheric acidification method.

C.Product use and market

(1) Used as building materials

(2) Used as raw materials for papermaking

(3) Used as reinforcement or functional filler for plastics and rubber

(4) Used for friction materials

(5) For the production of paints and coatings

White fiber gypsum powder

Profasional Gypsum Powder Factory