Sodium Fluoride (NaF) CAS 7681-49-4

Sodium Fluoride (NaF, CAS 7681-49-4) is an inorganic fluoride supplied as a white crystalline or powder material. It dissolves in water, with solubility depending on temperature. Industrial uses include fluoride manufacture, metal surface treatment, glass and enamel processing, and selected metallurgical flux systems.

Selecting an industrial Sodium Fluoride grade

Compare NaF assay together with the reporting basis: as received or on a dried basis. A dry-basis result excludes the specified drying loss and should not be compared directly with an as-received result. Also define particle-size distribution, moisture, water-insoluble matter, free acidity or alkalinity, and the impurity limits relevant to the process.

NaF content and fluoride content reported as F are different quantities. Pure NaF contains approximately 45.2% fluorine by mass, calculated from its formula. This theoretical conversion does not establish the purity of a commercial grade; other fluoride-containing impurities can also contribute to a total-fluoride result.

Quality-control methods and reporting

ISO 2831 describes determination of water-insoluble matter in industrial sodium fluoride; ISO 2832 covers moisture determination. State the selected method, drying conditions and reporting basis when comparing results. Silica or fluorosilicate, sulfate, chloride and relevant metal impurities may require separate limits for the intended application.

Ion chromatography can be used to determine fluoride and chloride with a method appropriate to the sample matrix. For a chromatographic report, specify the analytes, calibration, sample preparation, units and whether fluoride is reported as F or converted to NaF. An ion chromatogram alone does not establish every component of an industrial-grade specification.

Related materials for process selection

Ammonium bifluoride and sodium fluorosilicate are other fluoride-containing process materials. They differ from NaF in composition, solution behaviour and process compatibility; neither is an equal-weight substitute.

For flux-material comparisons, potassium tetrafluoroborate (KBF4) supplies a different complex fluoride. Selection depends on the metal, process temperature and complete flux formulation.

Tetrasodium pyrophosphate (TSPP) can be a complementary material in selected phosphate-conversion systems. It has a different role from NaF and supplies no fluoride; suitability depends on the established bath chemistry.

Storage and handling

Store in a cool, dry, well-ventilated place in tightly closed containers, protected from moisture. Only trained personnel should handle the product, using appropriate PPE and industrial-hygiene measures to avoid generating or inhaling dust and to prevent contact with skin and eyes.

Confirm supplied grade and supporting COA, TDS and SDS for the selected material.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.