Agent Name

Magnesium hexafluorosilicate

CAS Number

16949-65-8

Formula

F6-Si.Mg

Major Category

Mineral Dusts

Synonyms

Fluosilicate de magnesium [French]; Fluosilicic acid magnesium salt; Hexafluorosilicate(2-) magnesium (1:1); Magnesium fluosilicate; Magnesium hexafluorosilicate(2-); Magnesium silicofluoride (MgSiF6); Silicon fluoride magnesium salt; Silicate(2-), hexafluoro-, magnesium (1:1); Magnesium fluorosilicate; [ChemIDplus] FLUOROSILICATO DE MAGNESIO; SILICO FLUORURO DE MAGNESIO; [IUCLID] UN2853

Category

Other Mineral Dusts

Description

Solid; [CAMEO] White powder; [Gelest MSDS]

Sources/Uses

Used for mothproofing textiles; [Merck Index] Used to make other chemicals; [CAMEO]

Comments

Toxic by ingestion; May cause serious eye injury [Classifications by the EC] Not a skin irritant in rabbits (80% aqueous solution); Hematological and clinical chemistry changes, adverse dental effects, mineralization in bone tissue, interstitial nephritis, hyperkeratosis of the stomach, increased relative liver and kidney weights, and increased relative testes and adrenal weights in males observed in 4-week oral study of rats at 3,000 ppm dietary (approximately 300 mg/kg/day); [IUCLID] An eye irritant; Corrosive to mucous membranes; Inhalation may cause corrosive injuries to upper respiratory tract and lungs; May cause osteofluorosis; [Gelest MSDS] See "Magnesium." See "Fluorosilicic acid." See "Calcium hexafluorosilicate."

Exposure Assessment
BEI

Fluorides in urine = 2 mg/L prior to shift or 3 mg/L at end of shift; (Repeated measurements recommended.)

TLV (ACGIH)

2.5 mg/m3, as F

PEL (OSHA)

2.5 mg/m3, as F

MAK

1 mg/m3, inhalable fraction, as F

IDLH (NIOSH)

250 mg/m3, as F

Lethal Concentration

LC50 (rat) = 3,600 mg/m3/4hr

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

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: