Calcium fluoride , AR,99.5% , 7789-75-5

Synonym(s):
Calcium fluoride;Fluorite;Fluorspar

CAS NO.：7789-75-5

Empirical Formula: CaF2

Molecular Weight: 78.07

MDL number: MFCD00010907

EINECS: 232-188-7

PRODUCT Properties

• Melting point: 1402 °C
• Boiling point: 2500 °C (lit.)
• Density: 3.18 g/mL at 25 °C (lit.)
• refractive index: 1.434
• Flash point: 2500°C
• storage temp.: -20°C
• solubility: Slightly soluble in acid; insoluble in acetone.
• form: rod
• Specific Gravity: 3.18
• color: white
• Water Solubility: 0.015 g. per 100g H20 at room temperature.(INSOLUBLE)
• Sensitive: Hygroscopic
• Crystal Structure: CaF2 type
• crystal system: Cube
• Merck: 14,1667
• Solubility Product Constant (Ksp): pKsp: 8.28
• Space group: Fm3m
• Lattice constant:
  • a/nm: 0.546
  • b/nm: 0.546
  • c/nm: 0.546
  • α/o: 90
  • β/o: 90
  • γ/o: 90
  • V/nm3: 0.1631
• Exposure limits: ACGIH: TWA 2.5 mg/m3; NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3
• Dielectric constant: 2.5（Ambient）
• Stability: Stable. Calcium fluoride is inert to organic chemicals and many acids, including HF. It will slowly dissolve in nitric acid.
• InChIKey: WUKWITHWXAAZEY-UHFFFAOYSA-L
• CAS DataBase Reference: 7789-75-5(CAS DataBase Reference)
• NIST Chemistry Reference: Calcium fluoride(7789-75-5)
• EPA Substance Registry System: Calcium difluoride (7789-75-5)

Description and Uses

Calcium fluoride is colorless crystalline orwhite, powdery substance. Molecular weight=78.08;Specific gravity (H2O:1)=3.18 at 20℃; Boilingpoint=2495℃; Freezing/Melting point=1423℃. HazardIdentification (based on NFPA-704 M Rating System):Health 2, Flammability 0, Reactivity 0. Practically insolublein water.

Naturally occurring CaF2 is the principal source of hydrogenfluoride, a commodity chemicalusedto produce a wide range of materials. Fluoride is liberated from the mineral by the action of concentrated sulfuric acid:
CaF2 (solid)＋H2SO4 (liq)→CaSO4 (solid)＋2HF (gas)
CaF2 is used as an optical component because of its chemical stability under adverse conditions.Calcium fluoride is commonly used as a window material for both infrared and ultraviolet wavelengths, since it is transparent in these regions (about 0.15 to 9 mm) and exhibits an extremely low-refractive index.
Calcium Fluoride is a water insoluble calcium source for use in oxygen-sensitive applications, such as metal production. In extremely low concentrations (ppm), fluoride compounds are used in health applications. Fluoride compounds also have significant uses in synthetic organic chemistry. They are also commonly used to alloy metal and for optical deposition.
It is also used as a flux for melting and liquid processing of iron, steel and their composites. Its action is based on its similar melting point to iron, on its ability to dissolve oxides and on its ability to wet oxides and metals.

Safety

• Symbol(GHS): GHS07
• Signal word: Warning
• Hazard statements: H303-H315-H319-H335
• Precautionary statements: P261-P280a-P304+P340-P305+P351+P338-P405-P501a
• Hazard Codes: Xi,Xn
• Risk Statements: 36/37/38
• Safety Statements: 26-37/39-36
• RIDADR: 3288
• WGK Germany: 1
• RTECS: EW1760000
• Hazard Note: Irritant
• TSCA: Yes
• HS Code: 28261900
• Hazardous Substances Data: 7789-75-5(Hazardous Substances Data)
• Toxicity: LD50 i.p. in mice: 2638.27 mg/kg (Stratmann)