Overview
Sodium bifluoride (NaHF₂) is an inorganic salt composed of sodium and bifluoride ions. It is industrially significant due to its role as a fluorine source and its reactivity with silica and metals. The compound is typically synthesized by reacting sodium hydroxide with hydrogen fluoride. As a high-purity chemical, it is critical for specialized applications like precision glass etching and aluminum anodizing. Its controlled decomposition also makes it useful in fluorine gas generation systems.
Physical and Chemical Properties
Sodium bifluoride forms odorless white crystals with a density of 2.08 g/cm³. It decomposes at ~160°C, releasing hydrogen fluoride (HF), which necessitates careful thermal handling. The compound is hygroscopic and readily dissolves in water, forming acidic solutions. Chemically, it acts as a bifluoride donor, reacting with silica to form silicon tetrafluoride—a key mechanism in glass etching. Its oxidative properties make it effective for removing oxide layers from metals during surface treatments.
Main Applications
In glass manufacturing, sodium bifluoride etches decorative or functional patterns by selectively dissolving silica. The metalworking industry uses it for cleaning and descaling aluminum, steel, and titanium surfaces prior to anodizing or plating. It also serves as a precursor to other fluorine compounds, including cryolite (used in aluminum production) and fluorine gas. Niche uses include wood preservatives and industrial cleaning formulations where HF release is controlled.
Safety and Storage
Sodium bifluoride is classified as acutely toxic (Category 1, H300) and corrosive (Category 1B, H314). Exposure risks include severe skin burns, respiratory damage, and systemic toxicity from HF release. OSHA mandates sealed containers, chemical-resistant PPE, and fume hoods for handling. Storage requires dry, ventilated areas away from acids and bases. Bulk purchases should use double-lined polyethylene bags or fiber drums with desiccants to prevent moisture absorption and caking.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO-certified production, batch-wise purity analysis (≥98% assay), and SDS documentation. Technical-grade purity suffices for most applications, but electronics or pharmaceutical uses may require 99.5%+ purity. Logistics must ensure moisture-proof transport, preferably with palletized 25kg bags. Spot prices fluctuate with fluorine market trends; long-term contracts are advisable for large-volume users. Always audit supplier safety protocols for HF mitigation.
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