Magnesium Hydroxide ACS

Product Overview

Magnesium Hydroxide ACS is a white, odorless powder with the chemical composition Mg(OH)₂. This ACS Grade material delivers high purity suitable for pharmaceutical and industrial applications, including use as an antacid, laxative, and pH modifier in water treatment. The product exhibits sparing solubility in water and a strong alkaline character, contributing to its effectiveness in neutralization, moisture management, and formulation stability. The certified assay (ICP-OES) is typically 99.8% with a range of 99–100.5%, ensuring consistent performance in regulated environments. Its controlled trace metal profile aligns with stringent pharmaceutical requirements, while the low residue after ignition confirms high inorganic purity and reduced ash content for reliable processing. Storage under dry conditions and protection from moisture prevent clumping and preserve flow properties essential for precise dosing in manufacturing settings.

In addition to pharmaceutical utilities, Magnesium Hydroxide ACS is employed as a pH adjuster in water treatment, a flame-retardant additive in plastics and textiles, and as a neutralizing agent in various chemical processes. The product’s dense, slightly soluble nature supports controlled release and manageable handling in formulating reagents, making it suitable for both laboratory-scale experiments and industrial-scale production. This material meets ACS Reagent Grade and USP-NF Monograph standards, underscoring its credibility for research, quality control, and compliant production workflows.

Key Properties

• Property Name: Assay wt pct
• Chemical Formula: Mg(OH)₂
• Molecular Weight: 58.44 g/mol
• Boiling Point: N/A
• Specific Gravity: 2.36–2.40 (20°C, typical 2.38)
• Residue After Ignition: ≤ 0.1% (typical 0.05%)
• Chloride: ≤ 0.5 ppm (typical 0.1 ppm)
• Nitrate(NO3⁻): ≤ 0.5 ppm (typical 0.1 ppm)
• Ammonium (NH₄⁺): ≤ 1 ppm (typical 0.2 ppm)
• Sulfate (SO₄²⁻): ≤ 0.5 ppm (typical 0.1 ppm)
• Phosphate (PO₄³⁻): ≤ 0.1 ppm (typical 0.05 ppm)
• Arsenic (As): ≤ 0.01 ppm (typical 0.005 ppm)
• Heavy Metals (as Pb): ≤ 0.5 ppm (typical 0.2 ppm)
• Iron (Fe): ≤ 0.2 ppm (typical 0.05 ppm)
• Copper (Cu): ≤ 0.2 ppm (typical 0.05 ppm)
• Manganese (Mn): ≤ 0.5 ppm (typical 0.1 ppm)
• Nickel (Ni): ≤ 0.5 ppm (typical 0.1 ppm)
• Lead (Pb): ≤ 0.2 ppm (typical 0.05 ppm)
• Zinc (Zn): ≤ 1 ppm (typical 0.2 ppm)
• Aluminum (Al): ≤ 1 ppm (typical 0.2 ppm)
• Chromium (Cr): ≤ 0.5 ppm (typical 0.1 ppm)
• Cobalt (Co): ≤ 0.2 ppm (typical 0.05 ppm)
• Calcium (Ca): ≤ 20 ppm (typical 5 ppm)
• Magnesium (Mg): ≤ 200 ppm (typical 50 ppm)
• Potassium (K): ≤ 5 ppm (typical 2 ppm)
• Sodium (Na): ≤ 5 ppm (typical 2 ppm)
• Substances reducing permanganate: Passes test
• Sulfurous acid (H₂SO₃): ≤ 10 ppm (typical 5 ppm)
• Available chlorine (Cl₂): 0.5–2 wt% (typical 1 wt%)
• Free alkali (NaOH): 0–0.5 wt% (typical 0.1 wt%)
• Bromate (BrO₃⁻): ≤ 10 ppm (typical 5 ppm)
• Chlorate (ClO₃⁻): ≤ 50 ppm (typical 10 ppm)
• Water: ≤ 0.5% (typical 0.2%)
• Acidity (meq): ≤ 0.5 meq (typical 0.1 meq)
• Aldehydes: ≤ 5 ppm (typical 1 ppm)
• Substances darkened with H₂SO₄: Passes test

Common Applications

• Application Category: Antacid – Used in pharmaceutical formulations to neutralize gastric acid, providing rapid relief from indigestion with a predictable pH adjustment profile suitable for oral dosage forms.
• Application Category: Laxative – Acts as an osmotic laxative to promote bowel movements, with established performance in constipation relief and compatibility with standard pediatric and adult dosing regimens.
• Application Category: pH Adjuster – Employed to modify and stabilize pH in water treatment processes and industrial systems, enabling optimized corrosion control and process efficiency.
• Application Category: Flame Retardant Additive – Integrated into polymer and textile matrices to enhance fire resistance while maintaining material integrity and processability.
• Application Category: Neutralizing Agent – Used in chemical manufacturing to adjust acidity/alkalinity during reactions, facilitating reaction control and product quality.

Safety Precautions

Handling and storage should be conducted in a cool, dry environment to prevent moisture uptake and caking. Store in HDPE or glass containers with proper ventilation; keep containers tightly closed when not in use and away from incompatible materials, such as strong acids. Use appropriate PPE including chemical-resistant gloves, safety goggles, and a dust mask to minimize inhalation and dermal exposure. Ensure good housekeeping practices to limit dust generation and maintain clean work areas in accordance with SDS recommendations.

Additional safety considerations include compliance with exposure limits and emergency procedures. The SDS specifies eye and skin irritation hazards (Eye Irrit. 2, Skin Irrit. 2) with statements H319 and H315. In case of contact, rinse eyes or skin promptly with water and seek medical attention if irritation persists. If inhaled, move to fresh air and seek medical evaluation if symptoms occur. In case of ingestion, rinse mouth and seek medical advice. Transport is classified UN 1760, Corrosive liquid, n.o.s., Class 8, Packing Group II; follow applicable hazardous material regulations for handling and transport.

Benefits

✔ High Purity ACS Grade – Meets ACS Reagent Grade and USP-NF monograph standards, suitable for pharmaceutical and regulated manufacturing.
✔ Accurate Dosing and Purity – ICP-OES assay with narrow range (99–100.5%) supports repeatable formulation and quality control.
✔ Low Impurity Profile – Ultra-low heavy metals and anion contaminants ensure compatibility with therapeutic applications and regulatory compliance.