Sodium fluoride: Colorless shiny crystal or white powder, specific gravity 2.25, melting point 993 ℃, boiling point 1695 ℃. 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 ° C5.08), hydrofluoric acid, slightly soluble in alcohol. The aqueous solution is weakly alkaline and dissolves in hydrofluoric acid to form sodium hydrogen fluoride, which can corrode glass. Toxic!

 

Basic information

Chinese name: sodium fluoride

Chemical formula NaF

CAS Registry Number 7681-49-4

Colorless shiny crystals or white powder in appearance

Melting point 993 ℃

Also known as Dentalfluro, Duraphat, Villaumite

Molecular weight 41.99

English name Sodium Fluoride

Boiling point 1695 ℃

Density 1.125g/cm ³

EINECS login number 231-667-8

Water soluble and easily soluble

 

Introduction Information

Control information: The product is not under control

Name

Chinese name: Sodium fluoride

English alias: Sodium Fluoride, Dentalfluro, Duraphat, Villaumite

EINECS number: 231-667-8

Density: 1.125g/cm Chemical formula: NaF

Relative molecular weight: 41.99

 

Character

Colorless cubic or tetragonal crystals. Sensitive to moisture. Solubility in water (g/100ml): 4 at 15 ℃, 4.3100 at 25 ℃, 5 at 100 ℃, insoluble in ethanol. Partial hydrolysis of the aqueous solution results in an alkaline reaction. The pH of the newly prepared saturated solution is 7.4. Its aqueous solution can cause glass to fuzz, but its dry crystals or powder can be stored in glass bottles. Relative density 2.78. Melting point 993 ℃. Boiling point 1695 ℃. Medium toxicity, median lethal dose (rat, oral) 0.18g/kg. Has strong irritation.

Storage: Sealed and stored.

Purpose: Steel analysis. Photoelectric colorimetric method for the determination of phosphorus. Spot analysis for the determination of scandium. Blood testing. Masking agent. Flux.

Safety measures: Seal the packaging and store it in a dry and ventilated place

Ingestion: Drinking warm water, inducing vomiting and gastric lavage

Fire extinguishing: Use a large amount of water to extinguish the fire.

 

Main purpose

As a phosphating promoter in the coating industry, it stabilizes the phosphating solution, refines the phosphating process, and improves the performance of the phosphating film. Sealing Al3+, which has a very harmful negative catalytic effect, in the phosphating of aluminum and its alloys, enables the phosphating to proceed smoothly in wood preservatives, agricultural pesticides, brewing fungicides, pharmaceutical preservatives, welding flux, alkaline zincate zinc plating additives, enamel, paper making, etc.

Executive standards:

Executive standard GB4293-84

Indicator Name Premium Product

Sodium fluoride% ≥ 98

Water insoluble matter% ≤ 0.7

Sulfate (calculated as SO42+)% ≤ 0.3

Silicon oxide% ≤ 0.5

Sodium carbonate% ≤ 0.5

Acidity (as HF)% ≤ 0.1

Moisture% ≤ 0.5

 

Environmental effect

This substance poses great harm to the environment, and special attention should be paid to its addition to water bodies.

Health hazards:

Invasion pathway: inhalation, ingestion.

Health hazards: Acute poisoning: often caused by accidental ingestion. Immediately after taking it, severe nausea, vomiting, abdominal pain, and diarrhea appear. Severe cases may experience shock, difficulty breathing, and cyanosis. May die within 2-4 hours. Some patients experience urticaria, swallowing muscle paralysis, hand and foot spasms, or limb muscle spasms.

Sodium fluoride dust and vapor have a stimulating effect on the skin and can cause dermatitis.

Chronic effects: can cause fluorosis.

Environmental behavior:

Irritation: Rabbit transdermal: 500mg (24 hours), severe irritation.

Subacute and chronic toxicity: Continuous feeding of rats with a feed containing 7-9ppm fluoride can cause dental calcification disorders, while increasing the dose can cause skeletal changes.

Mutagenicity: Microbial mutagenicity: Salmonella typhimurium 1mg/dish. Cytogenetic analysis: human fibroblasts 20mg/L.

Life and death toxicity: the lowest oral toxic dose (TDL0) of rats is 240mg/kg (11-14 days of pregnancy), and the musculoskeletal dysplasia is abnormal.

Carcinogenicity: IARC Carcinogenicity Review: Human Unclear.

Hazardous characteristics: There are no special combustion and explosion characteristics.

Combustion (decomposition) product: hydrogen fluoride.

 

Emergency monitoring methods on site

Rapid tube method; Ion selective electrode method

 

Laboratory monitoring methods

Ion selective electrode method (GB7484-87, Water quality, fluoride)

Fluorine reagent spectrophotometry (GB7483-87, Water quality, fluoride)

Filter membrane fluoride ion selective electrode method (GB/T15434-95, air, fluoride)

 

Environmental standards

The maximum allowable concentration of harmful substances in the air of workshops in China (TJ36-79) is 1mg/m3 [F]

The maximum allowable concentration (fluoride) of harmful substances in the atmosphere of residential areas in China (TJ36-79) is 0.02mg/m3 (one-time value); 0.007mg/m3 (daily average)

China (GB16297-1996) Comprehensive Emission Standard for Air Pollutants (Fluoride) ① Maximum allowable emission concentration (mg/m3)

9-90 (Table 2); 11-100 (Table 1)

② Maximum allowable emission rate (kg/h)

Level 2 0.10-4.2 (Table 2); 0.12-4.9 (Table 1)

Level 3 0.15~6.3 (Table 2); 0.18-7.5 (Table 1)

③ Concentration limit for unorganized emission monitoring (mg/m3)

0.02 (Table 2); 0.02 (Table 1)

China (GB5048-92) Agricultural Irrigation Water Quality Standard (Fluoride) 2.0-3.0mg/L (Water, Dry, Vegetable)

China (GB11607-89) Fishery Water Quality Standard 1mg/L (Fluoride)

China (GB5749-85) Sanitary Standard for Drinking Water 1.0mg/L (Fluoride)

China (GB/T14848-93) Groundwater Quality Standard (mg/L) Class I 1.0; Class II 1.0; Class III 1.0; Class IV 2.0; Class V 2.0 or above (fluoride)

China (GHZB1-1999) Surface Water Environmental Quality Standard (mg/L)

Class I below 1.0; Class II 1.0; Class III 1.0; Class IV 1.5; Class V 1.5 (fluoride)

China (GB8978-1996)

Comprehensive sewage discharge standard (mg/L)

Level 1 10; Secondary 10-20; Grade III 20-30 (fluoride)

China (GB5058.3-1996) Solid Waste Leaching Toxicity Identification Standard Value 50mg/L (Fluoride)

 

Emergency response methods

1、 Leakage emergency response

Isolate the leakage contaminated area, set up warning signs around it, and suggest emergency treatment personnel to wear gas mask and corresponding work clothes. Do not come into direct contact with leaks. Avoid dust and collect with a clean shovel in a dry, clean, and covered container. If a large amount of leakage is collected and recycled or transported to a waste treatment site for disposal.

2、 Protective measures

Respiratory protection: When the concentration in the air exceeds the standard, a gas mask should be worn. When rescuing or escaping in an emergency, it is recommended to wear a self-contained breathing apparatus.

Eye protection: Wear chemical safety goggles.

Protective clothing: Wear corresponding protective clothing.

Hand protection: Wear chemical resistant gloves.

Other: Smoking, eating, and drinking are prohibited at the workplace. After work, take a shower and change clothes. Do not bring work clothes to non workplaces. Store clothes contaminated with toxins separately and use them for backup after washing. Maintain good hygiene habits.

3、 First aid measures

Skin contact: Remove contaminated clothing and immediately rinse thoroughly with flowing water.

Eye contact: Immediately lift the eyelids and rinse with flowing water for 10 minutes or with 2% sodium bicarbonate solution.

Inhalation: Remove from the site to a place with fresh air. Perform artificial respiration if necessary. Seek medical attention.

Ingestion: When the patient is awake, drink a large amount of warm water to induce vomiting and wash their stomach as soon as possible. Seek medical attention.

Fire extinguishing method: non combustible. Extinguishing media available around the fire site. Use a large amount of water to extinguish the fire. Disperse smoke and irritating gases with misty water.

 

Packaging and storage and transportation

Packaging method: plastic bags or two-layer kraft paper bags with fiberboard barrels, plywood barrels, or cardboard barrels; Plastic bucket (solid) outside the plastic bag; Plastic bucket (liquid); Two layers of plastic bags or one layer of plastic bags with outer gunny bags, plastic woven bags, and latex cloth bags; Composite plastic woven bags (polypropylene three in one bag, polyethylene three in one bag, polypropylene two in one bag, polyethylene two in one bag); Ordinary wooden boxes with plastic bags or two-layer kraft paper bags; Thread mouth glass bottles, iron cap pressure mouth glass bottles, plastic bottles or ordinary wooden boxes outside metal barrels (cans); Thread mouth glass bottles, plastic bottles, or tin plated thin steel drums (cans) are filled with bottom plate lattice boxes, fiberboard boxes, or plywood boxes.

Precautions for storage and transportation: During railway transportation, the dangerous goods loading table in the "Dangerous Goods Transport Rules" of the Ministry of Railways should be strictly followed for loading. Before transportation, the packaging container should be checked for completeness and sealing. During transportation, it should be ensured that the container does not leak, collapse, fall, or be damaged. It is strictly prohibited to mix with acids, oxidants, food and food additives for transportation. Transport vehicles should be equipped with leakage emergency response equipment during transportation. During transportation, it is necessary to prevent exposure to sunlight, rain, and high temperatures. Store in a cool, dry, and well ventilated warehouse. The temperature of the warehouse shall not exceed 30 ℃, and the relative humidity shall not exceed 80%. Packaging sealing. It should be stored separately from acids and edible chemicals, and mixed storage should be avoided. The storage area should be equipped with suitable materials to contain leaks. The "Five Double" management system for extremely toxic substances should be strictly implemented.

 

Toothpaste and sodium fluoride

1. Product Description

Sodium fluoride powder, 150 mesh and 200 mesh, with a food grade content of 98%, in accordance with the quality standard GB4293-84

The physicochemical properties of sodium fluoride: Sodium fluoride is an anhydrous white crystal or powder.

Molecular formula NaF

Molecular weight 42,

Specific gravity 2.6,

Insoluble in water.

Colorless shiny crystals or white powder. It belongs to the tetragonal crystal system and has regular hexagonal or octahedral crystals.

Relative density 2.558. Melting point 993 ℃, boiling point 1695 ℃. Slightly soluble in alcohol, soluble in water, with an alkaline aqueous solution that can corrode glass; Dissolve in hydrofluoric acid to form sodium hydrogen fluoride. Toxic and corrosive.

2. Quality standards

Indicator unit requirements

Appearance White powder

Content (NaF)......% ≥ ninety-eight

Clarity By experiment

Insoluble matter in water% ≤ zero point one zero

Acidity (calculated as H+) Mmol/100g ≤ 10.0

Alkalinity (calculated as OH -) Mmol/100g ≤ 4.0

Chloride (calculated as Cl -)...% ≤ zero point zero one

Sulfate (calculated as SO42-)...% ≤ zero point zero five

Fluorosilicate (as SiF6)....% ≤ one point two

Iron Mg/kg ≤ 50

Heavy metals (calculated as... P.b.)...... Mg/kg ≤ 50

3. Packaging

Plastic woven bags lined with double layer plastic bags for sealed packaging, with a net weight of 25 kilograms per bag; Alternatively, other specifications of packaging can be used according to user requirements.

4. Application in toothpaste

Adding fluoride to toothpastes can prevent caries, because fluoride and enamel can form fluorapatite on the surface of enamel, improve the hardness and acid resistance of enamel, reduce the formation of plaque, and reduce the incidence rate of caries. The dosage of sodium fluoride in toothpaste is generally 0.22-0.33%.

Packaging and storage and transportation: Polyethylene woven bags lined with plastic bags, with a net weight of 25KG per bag

 

Security information

Packaging level: III

Hazard category: 6.1

Customs Code: 2826192010

Dangerous goods transportation code: UN16906.1/PG3

WGKGermany: 1

Hazard category code: R25; R32; R36/38

Safety instructions: S23-S24/25-S45-S36-S22

RTECS number: WB0350000

Dangerous goods label: T: Toxic