Magnesium Hydroxide 99%

What is Magnesium Hydroxide? Our Magnesium Hydroxide 99%, with the chemical formula Mg(OH)₂, is a high-purity inorganic compound commonly used in pharmaceutical, industrial, and environmental applications. It is also known by alternate names such as Milk of Magnesia, Magnesia Hydroxide, and Magnesium (II) Hydroxide. This white, odourless powder is valued for its versatility, including its use as an antacid, laxative, and in water treatment processes.

Consistent Quality: We use only carefully sourced Magnesium Hydroxide 99%, ensuring reliable and consistent performance for a wide range of applications in the pharmaceutical, industrial, and environmental sectors.

Shipped from Manchester, UK Facility: Sourced and packaged in non-toxic, chemical-resistant containers, ensuring safe handling and consistent quality for our customers.

Frequent Uses

Pharmaceutical Applications
Widely used in the pharmaceutical industry, particularly as an antacid and laxative. It is commonly found in over-the-counter products used to relieve heartburn, indigestion, and constipation. Magnesium Hydroxide neutralises stomach acid and has a mild laxative effect, making it an essential component in various treatments for digestive health.

Water Treatment
Used in water treatment processes to neutralise acidic waters and to soften hard water. It is particularly effective in controlling pH levels in wastewater and in removing impurities such as heavy metals. Magnesium Hydroxide is also employed in industrial water systems to improve water quality and meet regulatory standards.

Environmental Applications
Magnesium Hydroxide plays an important role in environmental applications, particularly in the treatment of acidic industrial effluents. It is used to neutralise acidic waste streams and to prevent environmental pollution. It also serves as a flocculant in wastewater treatment to help remove suspended solids and improve the quality of discharged water.

Industrial Manufacturing
Utilised in the manufacture of flame retardants, particularly for polymers and plastics. Its high thermal stability makes it an effective additive in materials that require resistance to fire. It is also used in the production of magnesium-based compounds and in chemical synthesis where a mild base is required.

Cosmetic and Personal Care Products
Occasionally used in cosmetic and personal care products, such as deodorants, where it acts as an antiperspirant. It is valued for its ability to absorb moisture and neutralise acids, helping to keep the skin dry and odour-free. It is also used in skin care formulations due to its soothing and gentle properties.

• Flame retardant in the manufacturing of plastics and rubber products
• Flocculant in wastewater treatment processes
• Key ingredient in the production of other magnesium compounds
• Industrial applications in agriculture, ceramics, and construction

Technical grade

Minimum Assay: 99%
Molecular Formula: Mg(OH)2 
Molecular Weight: 58.32 g/mol

Chemical Analysis 

% by weight

MgO: 99.9
CaO: 0.01
SiO²: 0.02
Fe²O³: 0.001

Residue on a 53 μm sieve (ISO 787-7) 0.1%

Loss on ignition (950oC) 31%

Cas Number: 1309-42-8

Einecs Number: 215-170-3

HS Code / Commodity Code: 2816100000

Hazard Phrases: H0001