Ammonium Bifluoride Flakes

Product Overview

Ammonium Bifluoride Flakes (NH4HF2) is a white crystalline solid supplied in technical grade. This fluorine-releasing compound exhibits strong acidic properties and serves as a versatile fluoride source for etching, cleaning, and synthesis processes. With a typical assay of 99.5 wt% and a molecular weight of 83.01 g/mol, the material is characterized by low residue upon ignition and a narrow impurity profile suitable for demanding industrial applications. The solid form, density approximately 1.25 g/mL at 25°C, dissolves readily in water to provide a controlled source of fluoride ions, making it a preferred choice for precision operations where consistent fluoride delivery is critical. In line with industry standards, the product is formulated for reliable performance in electronics, glass, and chemical manufacturing environments, while maintaining strict quality controls to minimize heavy metal and impurity levels.

Its profile supports applications ranging from wafer-scale etching and oxide removal to analytical titrations and pH control in fluoride-rich streams. The batch-to-batch consistency, dry storage requirements, and compatibility with HDPE and glass packaging reinforce its suitability for laboratory and manufacturing settings where chemical purity and traceability are essential. This product is backed by Technical Grade specifications that align with common industry expectations for reliability, purity, and performance in fluoride-related processes.

Key Properties

• Appearance: White crystalline flakes
• Chemical Formula: NH₄HF₂
• Molecular Weight: 83.01 g/mol
• CAS: 1341-49-7
• Solubility: Soluble in water
• Density (25°C): 1.25 g/mL
• Melting Point: -11 to -16°C (decomposes upon heating)
• Assay (wt %): 99.5% (typical); 98–100% (min–max)
• Specific Gravity (20°C): 1.25 (typical)
• Residue After Ignition: ≤ 0.05% (typical 0.05%, max 0.1%)
• Chloride (ppm): Typical 20; Max 50
• Nitrate NO₃ (ppm): Typical 5; Max 20
• Ammonium NH₄ (ppm): Typical 500; Max 1500
• Sulfate SO₄ (ppm): Typical 150; Max 500
• Phosphate PO₄ (ppm): Typical 50; Max 200
• Arsenic As (ppm): Typical 0.1; Max 0.5
• Heavy Metals (as Pb) (ppm): Typical 0.2; Max 1
• Iron Fe (ppm): Typical 5; Max 20
• Copper Cu (ppm): Typical 1; Max 5
• Manganese Mn (ppm): Typical 1; Max 5
• Nickel Ni (ppm): Typical 0.5; Max 2
• Lead Pb (ppm): Typical 0.5; Max 2
• Zinc Zn (ppm): Typical 1; Max 5
• Aluminum Al (ppm): Typical 1; Max 5
• Chromium Cr (ppm): Typical 0.5; Max 2
• Cobalt Co (ppm): Typical 0.2; Max 1
• Calcium Ca (ppm): Typical 10; Max 50
• Magnesium Mg (ppm): Typical 10; Max 50
• Potassium K (ppm): Typical 10; Max 50
• Sodium Na (ppm): Typical 10; Max 50
• pKa: 3.0–3.1 (weak acid behavior; HF/HF₂⁻ system)
• Odor: Slightly pungent
• Appearance (sanitized): White crystalline flakes

Common Applications

• Etching Agent: Industry: Electronics – Used as a fluoride source in semiconductor etching and oxide removal on silicon wafers, enabling controlled material transfer and profile definition with corrosive efficiency.
• Cleaning Agent: Industry: Industrial Cleaning – Effective removal of oxides from glass and metal surfaces, assisting in surface preparation prior to coating or bonding.
• Fluoride Source: Industry: Chemical Manufacturing – Provides fluoride ions for synthesis of fluorinated compounds and specialized chemistries requiring fluoride delivery.
• pH Adjuster: Industry: Water Treatment – Utilized to adjust acidity in fluoride-containing water treatment streams, with careful control to maintain regulatory compliance.
• Analytical Reagent: Industry: Laboratory – Commonly employed in analytical chemistry for titrations and qualitative/quantitative fluoride-related assays.
• Surface Treatment: Industry: Glass Manufacturing – Participates in glass polishing and conditioning workflows where fluoride-containing species improve material interactions.
• Corrosion Inhibition Studies: Industry: Materials Science – Used in controlled experiments examining fluoride-based corrosion mechanisms and protective coatings.
• Etched Pattern Development: Industry: Microfabrication – Supports research and development of etched microstructures in specialty substrates.

Safety Precautions

Handling, storage, and protective equipment should follow strict safety protocols. Store in a cool, dry place away from moisture, and use compatible containers (HDPE or glass). Wear appropriate PPE, including chemical-resistant gloves, splash goggles, and protective clothing to prevent skin and eye contact. Maintain proper ventilation in storage and handling areas to minimize inhalation risk and avoid exposure to moisture that can promote hydrolysis or caking.

Additional safety considerations include adherence to SDS guidance: UN 2922, Corrosive solid, n.o.s., Class 8, PG II; DANGER signal word; H314 and H302 hazard statements. In case of contact with skin or eyes, rinse immediately with plenty of water and seek medical attention if irritation persists. For ingestion, do not induce vomiting; rinse mouth and consult medical staff. In case of inhalation, move the person to fresh air and monitor breathing. Emergency procedures should follow established spill control, neutralization, and first-aid guidelines outlined in the SDS and local regulatory requirements.

Benefits

✔ Technical Grade Purity – 99.5% typical assay with tight impurity profile supports reliable fluoride delivery in sensitive processes.
✔ Stable, Dry Form – Flakes maintain quality when stored in a dry environment and in compatible containers, reducing moisture-related variability.
✔ Broad Industry Compatibility – Suitable for electronics, glass cleaning, analytical titrations, and fluoride synthesis with traceable specifications.
✔ Regulatory Alignment – Meets industry expectations for Technical Grade chemicals with documented impurity controls and test methods.