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Wollastonite
Table of contents
Key Data
Formula: CaSiO3 or Ca2SiO4
CAS: 13983-17-0
Other names: Calcium silicate, calcium orthosilicate, CalSil
Appearance: White powder
Solubility in water: 0.095g/l. Aqueous solution has a pH of 9.9
Melting Point: 1410 - 1540°C
Dustiness:
Respirable crystalline silica: <1% (by weight)
Composition/Impurities
Wollastonite is strictly CaSiO3, but one of a range of calcium silicate compounds. Data given here is for CaSiO3, unless stated otherwise.
A fibrous silicate, but it has no bio-persistence unlike asbestos, so is not associated with the same health risks.
Small amounts of iron, magnesium or manganese may replace some of the calcium.
Uses
Used to introduce calcium with a lower LOI than whiting, so a lower risk of pinholing. It also has a lower melting point.
Exposure Routes
Skin and Eye Exposure
May cause redness of the eyes
Skin Absorption
Not absorbed
Inhalation
May cause coughing
Ingestion
Toxicity
Acute
Skin
None
Inhalation
None
Ingestion
May cause indigestion
Repeat Dose
Skin
None
Inhalation
None
Ingestion
None
Genotoxicity
None
Carcinogenicity
Whilst limited evidence shows that it is probably not carcinogenic, there is insufficient evidence to be certain of this.
Reproductive Toxicity
None
Fire Hazard
Not flammable
Health and Safety Practice
Standard dust precutions
Disposal
Regulatory Requirements
Dust Limits
| _Regulator_ | _8hr TWA mg/m³_ | _15min TWA mg/m³_ | _Notes_ |
| UK HSE | 10 | All calcium silicates. Inhalable. | |
| UK HSE | 4 | All calcium silicates. Respirable. |
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