Boric Acid Powder 99% Acs Grade

Product Overview

Boric Acid Powder 99% ACS Grade (boric acid, CAS 10043-35-3) is a white crystalline powder with high purity suitable for stringent analytical and industrial applications. Its chemical formula, H₃BO₃, reflects its mild acidity and buffering properties, making it a reliable pH adjuster and a boron source in diverse chemical syntheses. This ACS-grade material is characterized by a typical assay of 99.5% with a tight specification window (min 99%, max 100%), ensuring consistent performance across batches. Its density at 20°C is 1.44 g/mL and it exhibits low residue after evaporation, supporting high-purity requirements in precision manufacturing and laboratory workflows. The product is odorless, highly soluble in water, and only slightly soluble in alcohol, enabling straightforward dispersion in aqueous systems and controlled release in formulation processes.

In addition to its buffering capacity, boric acid is widely employed in glass manufacturing to improve durability and thermal stability, as a boron source in fertilizers to promote plant health, and as a preservative or buffering component in select pharmaceutical formulations. The material is manufactured under controlled conditions to minimize impurities such as chlorides, sulfates, nitrates, and trace metals, aligning with industry standards for ACS Reagent Grade and USP-NF Monograph compliance.

Key Properties

• Appearance: White crystalline powder
• Chemical Formula: H₃BO₃
• Molecular Weight: 61.83 g/mol
• Boiling Point: N/A
• Specific Gravity (20°C): 1.435–1.445 (typical 1.44)
• CAS: 10043-35-3
• Solubility: Soluble in water; slightly soluble in alcohol
• Assay (wt %): Min 99.0, Max 100.0, Typical 99.5 (Titration with standardized NaOH)
• Residue (Mass Loss on Drying): Max 0.001% (typical 0.0005%)
• Color (APHA/Hazen): Max 10 (typical 5)
• Chloride (ppm): Max 0.5 (typical 0.2)
• Nitrate (ppm NO₃⁻): Max 0.5 (typical 0.2)
• Ammonium (ppm NH₄⁺): Max 1 (typical 0.5)
• Sulfate (ppm SO₄²⁻): Max 0.5 (typical 0.2)
• Phosphate (ppm PO₄³⁻): Max 0.5 (typical 0.2)
• Arsenic (ppm as As): Max 0.01 (typical 0.005)
• Heavy Metals (as Pb, ppm): Max 0.5 (typical 0.1)
• Iron (ppm Fe): Max 0.2 (typical 0.05)
• Copper (ppm Cu): Max 0.5 (typical 0.1)
• Manganese (ppm Mn): Max 0.5 (typical 0.1)
• Nickel (ppm Ni): Max 0.5 (typical 0.1)
• Zinc (ppm Zn): Max 0.5 (typical 0.1)
• Aluminum (ppm Al): Max 2 (typical 0.5)
• Chromium (ppm Cr): Max 0.5 (typical 0.1)
• Cobalt (ppm Co): Max 0.5 (typical 0.1)
• Calcium (ppm Ca): Max 5 (typical 1)
• Magnesium (ppm Mg): Max 5 (typical 1)
• Potassium (ppm K): Max 5 (typical 1)
• Sodium (ppm Na): Max 5 (typical 1)
• Available Chlorine: 0% (not applicable for ACS boric acid)
• Substances Reducing Permanganate: Passes test (Potassium permanganate time test)
• Water Content: 0% (Not applicable)

Common Applications

• Application Category: pH Buffering Agent – Utilized in industrial processes to maintain stable pH levels, enabling controlled reaction environments and improved process reproducibility.
• Fertilizer Component: Fertilizer Supplement – Serves as a boron source to support plant growth, particularly in crops sensitive to boron deficiency, with compatibility in formulation matrices.
• Glass Manufacturing: Glass Industry Input – Included in glass formulations to improve durability, thermal resistance, and optical properties, with precise boron incorporation.
• Preservative: Pharmaceutical Formulations – Acts as a preservative or buffering component in select compounded preparations, aligning with regulatory-grade requirements.
• Flame Retardant: Construction Materials – Added to composite materials to enhance fire resistance, contributing to regulatory-compliant safety profiles.

Safety Precautions

Handling and storage should be conducted in a cool, dry environment away from moisture. Store in HDPE or glass containers to prevent contamination and ensure product integrity. Wear appropriate PPE, including gloves and goggles, and maintain adequate ventilation to minimize dust exposure during handling. The material is non-flammable but can irritate the eyes and respiratory system if inhaled or if dust becomes airborne during handling; use dust control measures and avoid inhalation of powders.

Further safety considerations include adherence to SDS guidance: the product is labeled with a WARNING signal word, and hazard statements indicate eye irritation (H319) and potential respiratory irritation (H335). In case of exposure, follow the provided first-aid measures: rinse eyes thoroughly, wash skin with soap and water, move to fresh air if inhaled, and seek medical attention for ingestion or persistent symptoms. Transport is regulated as UN 3077, Environmentally hazardous substance, solid, n.o.s., Class 9, Packing Group III. Maintain compliance with ACS/Reagent Grade standards and USP-NF monographs when selecting for use in regulated environments.

Benefits

✔ High Purity ACS Grade – Meets or exceeds ACS Reagent Grade and USP-NF Monograph specifications for reliable analytical performance.
✔ Consistent Quality – Tight assay range, low residue, and controlled impurity profile support reproducible manufacturing and testing outcomes.