Agent Name

Kieselguhr, calcined

CAS Number

91053-39-3

Formula

Unspecified

Major Category

Mineral Dusts

Synonyms

Diatomaceous silica, calcined; [ChemIDplus] Calcinated diatomaceous earth; Calcinated diatomite; Calcined Kieselguhr; Calcined kieselguhr; Calcined diatomaceous earth; Calcined diatomite; CALCINED KIESELGUR; Diatomeenerde; Gecalcineerde kieselgoer; Kieselguhr calcine; Kieselgur; Moler, calcined diatomaceous earth; [IUCLID] Difinity RapidTip; [Sigma-Aldrich MSDS]

Category

Other Mineral Dusts

Description

Solid; [IUCLID]

Sources/Uses

Used in the agricultural, chemical, paints-lacquers-varnishes, fuel, and paper-pulp-board industries; Used as a pesticide, absorbent, adsorbent, and carrier for active ingredients; [IUCLID]

Comments

"TSCA Definition 2008: Kieselguhr heated in a rotary furnace to 600.degree.C (1112.degree.F) at which temperature the water evaporates and the iron becomes oxidized. Consists mostly of oxides of aluminum, iron and silicon." [ChemIDplus] Contains crystalline silica, known to cause occupational silicosis; Causes no skin and mild eye irritation; Not a skin sensitizer; [IUCLID] The main problem in assessing the risk of exposure to diatomaceous earth is its varying degree of contamination with crystalline silica. While the natural version usually contains about 1%, up to 60% may be present in flux-calcined amorphous silica. [Rom, p. 527] May cause irritation; May have cumulative adverse effects to organs by prolonged or repeated inhalation exposure; Targets the lungs; [Sigma-Aldrich MSDS] See "Diatomite." See "Silica, amorphous."

Adverse Effects
Chronic Bronchitis

Yes

Fibrogenic

Yes

Links to Other NLM Databases
Toxicity Information

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Chemical Information

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: