What Is Sodium Fluoride?
Sodium fluoride [1] is a colorless shiny crystal or a white powdery compound with a specific gravity of 2.25 and a melting point of 993 ° C and a boiling point of 1695 ° C. Soluble in water (solubility 10 ° C 3.66, 20 ° C 4.06, 30 ° C 4.22, 40 ° C 4.4, 60 ° C 4.68, 80 ° C 4.89, 100 ° C 5.08), hydrofluoric acid, slightly soluble in alcohol . The aqueous solution is weakly alkaline, soluble in hydrofluoric acid to form sodium hydrogen fluoride, which can corrode glass. poisonous! It is widely used in various fields such as phosphating accelerators, agricultural pesticides, sealing materials and antiseptics in the coating industry.
- 1. Properties: white powder or crystal, odorless.
- 2. pH value: 7.4 (newly prepared saturated solution)
- 3. Melting point (): 986.9 ~ 996
- 4. Boiling point (): 1695 ~ 1700
- 5. Relative density (water = 1): 2.56 ~ 2.79
- 6. Saturated vapor pressure (kPa): 0.13 (1077 ° C)
- 7. Octanol / water partition coefficient: -0.77
- 8. Solubility: soluble in water, slightly soluble in ethanol. [2]
- 1. Molar refractive index: None available
- 2. Molar volume (cm3 / mol): no available
- 3.
- 1. Hydrophobic parameter calculation reference value (XlogP): None
- 2.Number of hydrogen bond donors: 0
- 3.Number of hydrogen bond acceptors: 1
- 4.Number of rotatable chemical bonds: 0
- 5.Number of tautomers: none
- 6. Topological molecular polar surface area
- 7.Number of heavy atoms: 2
- 8.
- Dangerous Transport Code: UN 1690 6.1 / PG 3
- Executive standard GB4293-84
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- This substance is a great hazard to the environment. Special attention should be paid to the addition of water.
- China (TJ36-79) The harmful substances in the air of the workshop
- One,
- Packaging method: plastic bag or two-layer kraft paper bag outside fiberboard barrel, plywood barrel, cardboard barrel; plastic barrel outside plastic barrel (solid); plastic barrel (liquid); two-layer plastic bag or one plastic bag outside sack, plastic weave Bags, latex cloth bags; composite plastic woven bags (polypropylene three-in-one bags,
- 1.Product description
- Sodium fluoride powder 150 mesh 200 mesh food grade content 98 (%) Implementation of quality standards GB4293-84
- Physical and Chemical Properties of Sodium Fluoride: Sodium fluoride is anhydrous white crystal or powder.
- Molecular formula NaF,
- Molecular weight 42,
- Specific gravity 2.6,
- not soluble in water.
- Colorless shiny crystal or white powder. It is a tetragonal crystal system with regular hexahedral or octahedral crystals.
- The relative density is 2.558. The melting point is 993 ° C and the boiling point is 1695 ° C. Slightly soluble in alcohol, soluble in water, aqueous solution is alkaline and can corrode glass; soluble in hydrofluoric acid to form sodium hydrogen fluoride. Toxic and corrosive.
- 2.Quality standards
- Index unit requirements
- Appearance ............ White powder
- Content (NaF) ........% 98.0
- Clarity ......... passed the test
- Water insoluble matter .........% 0.10
- Acidity (as H +) ...... mmol / 100g 10.0
- Alkalinity (based on OH-) ............ mmol / 100g 4.0
- Chloride (calculated by Cl-) ............% 0.01
- Sulfate (based on SO42-) ...% 0.05
- Fluorosilicate (with SiF6) ............% 1.2
- .
- Iron ... mg / kg 50
- Heavy metals (calculated as ... Pb) ............ mg / kg 50
- 3. Packaging
- Plastic woven bag lined with double-layer plastic bag sealed packaging, net weight of 25 kg per bag; or other specifications according to user requirements.
- 4. Application in toothpaste
- Adding fluoride to toothpaste can prevent caries, because fluoride and enamel can form fluorapatite on the surface of enamel, improve the hardness and acid resistance of enamel, and reduce the formation of plaque Reduce the incidence of dental caries. The amount of sodium fluoride in toothpaste is generally 0.22-0.33% [6] .
- Packaging, storage and transportation: polyethylene woven bag lined with plastic bag, net weight 25KG per bag