Magnesium Hydroxide

SEM of Kisuma 5AMagnesium Hydroxide is an inorganic compound with the formula Mg(OH)2. The solid mineral form of Magnesium Hydroxide is brucite, first described in 1824 and named after its discoverer, the American mineralist Archibald Bruce (1777-1818). Brucite is used as a flame retardant because it thermally decomposes in a similar way as aluminium hydroxide and mixtures of huntite and hydromagnesite, to release water. The superior properties of the synthetic form of Mg(OH)2, in terms of purity and particle size distribution,has opened up far more applications. Synthetic Magnesium Hydroxide is produced by Kyowa Chemical Industry since 1950 and by us, Kisuma Chemicals since 1998.

One important application of Mg(OH)2 is the use of the material in the pharmaceutical industry, for example as antacid to neutralize stomach acids and as laxative. Although the use of Mg(OH)2 for this purpose was already described in 1829 by Sir James Murray, who used a fluid magnesia preparation to treat the Lord Lieutenant of Ireland, the Marquis of Anglesey, of stomach pain, it was first sold under the brandname ''Philip's Milk of Magnesia'' by Charles Henry Philip's in 1872. Today, medicinal type Mg(OH)2 is sold in liquid form, chewable tablets or tablets.

The largest industrial application of Mg(OH)2 is flame retardants for articles such as roofing, isolation materials, plastic articles and coatings. The mechanism of flame retardancy is based on the endothermic decomposition of the material into MgO and H2O. This reaction adsorbs heat, which delays ignition of the associated substance. The water that is released dilutes combustible gases and inhibits oxygen from aiding the combustion. Other known applications of Mg(OH)2 include food additives, where the material is used as acidity regulator, and as precursor for other magnesium materials, most notably MgO.

If you would like to know more about this class of material, or to receive sampls of our industrially relevant materials for your studies, please contact our R&D department.







SEM picture of Alcamizer P93Hydrotalcite is a Layered Double Hydroxide whose name is derived from its resemblance with talc and its high water content. Layered double hydroxides (LDH) comprise an unusual class of layered materials with positively charged hydroxide layers and charge balancing, mobile anions located in the interlayer region. This structure gives these material anion-exchange properties. The natural form of hydrotalcite is mined in small quantities in the Snarum area of Norway and the Ural area of Russia. Carl Christian Hochstetter (1842) was the first to report about hydrotalcite, which was attached firmly to a schist. He described a white material with a pearl like luster, with the formula Mg6Al2(OH)16CO3 . 4H2O.

Kyowa Chemical Industry of Japan (Kyowa) noticed the unique structure of hydrotalcite and became the first in the world to succeed in the industrial synthesis of the material in 1966. Shortly after that, Kyowa's synthetic hydrotalcite found its way to the pharmaceutical industry, where it was applied as an antacid agent. Today, the material is sold by globally known pharmaceutical firms and continues to be widely supplied to various nations all over the world.

Following the successful introduction of hydrotalcite in the pharmaceutical industry, Kyowa and its subsidiaries succeeded in developing new applications for its synthetic hydrotalcites. One of the most noteable results is the largescale usage of hydrotalcite by the global plastic production and processing industry. Traditionally, plastic compounds used to contain heavy metal stabilizers. However adverse effects on the human body, environmental destruction, etc. of such heavy metals had lead to critisicm which opened the way to more environmentally friendly stabilizer systems in which our synthetic hydrotalcites play a pivotal role.

An enormous amount of research is dedicated to study synthetic hydrotalcite and its suitability for applications including, but certainly not limited to, anti-corrosion, catalysis, encapsulation, controlled release and water technology. Kisuma Chemicals and Kyowa Chemical Industry are at the forefront of this development, offering support to innovation where possible. We are technically and commercially interested in all developments concerning these environmentally friendly materials.

If you would like to know more about this class of materials, to exchange ideas on an academic level, or to receive samples of our industrially relevant materials, please do not hesitate to contact our R&D department.


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