ZN2825 Zinc Silicate (CAS No. 68611-47-2)

Catalog No. ZN2825
Molecular Formula Zn2SiO4
CAS Number 68611-47-2
Appearance White powder
Purity 99.5%
Synonyms Willemite

Zinc Silicate (CAS 68611-47-2) is a white powder, with a molecular formula of Zn2SiO4 and a molecular weight of 222.84. Stanford Advanced Materials (SAM) offers high-quality Zinc Silicate.

Related products:Zinc Stearate Powder, Zinc Hydroxide Carbonate Powder, Zinc Gluconate Powder, Zinc Molybdate Powder.

Zinc Silicate Description

Zinc Silicate (CAS 68611-47-2), also known as willemite, is a mineral (Zn2SiO4) and a minor ore of zinc. It is highly fluorescent (green) under shortwave ultraviolet light. It occurs in a variety of colors in daylight, in fibrous masses, solid brown masses (troostite), and apple-green gemmy masses.

Zinc Silicate Specifications

Product Name

Zinc Silicate

CAS Number


Molecular formula


Molecular weight



4.0 g/

Melting point

1500 °C


< 0.1 g/l (20°C)

Safety Information



Signal word


Hazard statements


Precautionary statements


Personal protective equipment

Eyeshields, Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges


UN 2722 5.1 / PGIII

WGK Germany


Zinc Silicate Applications

Doped with manganese-II, Zinc Silicate (CAS 68611-47-2) fluoresces with a broad white emission band. Some versions had some of the zinc replaced with beryllium. In the 1940s it was largely replaced by the second-generation halophosphors based on the fluorapatite structure. These, in turn, have been replaced by the third-generation TriPhosphors.

Nowadays, Zinc Silicate has been used for inorganic zinc-rich coatings which afford superb corrosion resistance. They are also rock hard and very abrasion-resistant. They make some of the best anti-corrosive primers available. Ethyl silicate based inorganic zincs (Galvit ES600 & Galvit ES510) should be applied at 75 microns (dft). Because they have a tendency to grip unlike most other coatings, they may be applied to the faying surfaces of bolted steel joints. Inorganic zinc-rich primers have excellent resistance to temperatures up to the melting point of zinc (above 400°C).


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