Magnesium hydroxide CAS 1309-42-8

Magnesium hydroxide is an excellent flame retardant for plastic and rubber products. In environmental protection, it is used as flue gas desulphurisation agent, instead of caustic soda and lime as neutralising agent for acid-containing wastewater and adsorbent for heavy metals. In addition, it can also be used in the electronics industry, medicine, sugar refining, as thermal insulation materials and the manufacture of other magnesium salt products. Magnesium hydroxide is used as absorbent for flue gas desulphurisation, in the 1970s before the flue gas desulphurisation most of the sodium hydroxide method, lime gypsum method, due to the by-products to the environment caused by the secondary pollution, so since the 1980s to change to the magnesium hydroxide method; acidic wastewater neutralising agent; synthetic resins flame retardant, before the bromine, phosphorus, chlorine, and the system of inorganic salts, in which the product more than the use of aluminium hydroxide Now has changed Chemicalbook with magnesium hydroxide, mainly in the thermoplastic resin with magnesium hydroxide can make the dehydration decomposition temperature increased to 350 ℃ or more; medicine used to control gastric acid agent and laxative; food additives, used as mineral additives, colour protectant, desiccant, alkaline agent, sugar auxiliary; used as a chemical reagent, measuring ammonium salt: Mg (OH) 2 + 2NH4Cl → MgCl2 + 2NH4Cl → MgCl2 + 2NH4Cl → MgCl2 + 2NH4Cl → MgCl2 + 2NH4Cl → MgCl2 + 2NH4Cl → MgCl2 + MgCl2 + 2NH4Cl MgCl2+2NH4OH This product has the advantages of non-smoke, non-toxic, non-corrosive, cheap and easy to obtain, and the temperature of decomposition and release of water is higher than aluminium hydroxide. It is more suitable for high temperature processing of plastics. Magnesium hydroxide can be used as a flame retardant for plastics and rubbers such as polyethylene, polypropylene, polyvinyl chloride, EPDM rubber, unsaturated polyester and so on. It can also be used as a flame retardant for paints.

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Model:
1309-42-8
Brand:
bosschemical
Code:
1309-42-8

Product Description

Magnesium hydroxide
CAS No. 1309-42-8

Alias: Magnesium hydroxide, Ph.Eur.4, BP2001, USP24, E528;Magnesium hydroxide, min. 95%, 10-15 micron;
Molecular formula：H2MgO2
Molecular weight：58.32

Structural formula：

氢氧化镁结构式

1.Performance and use:

Magnesium hydroxide is a common magnesium salt compound, chemical formula Mg(OH)2, molecular weight 58.33, white hexagonal crystals or amorphous powder. Relative density 2.36. Loses 1 molecule of water at 350°C, generating ChemicalbookMgO. Soluble in dilute acid and ammonium salt solution, almost insoluble in water and alcohol. Solubility in water (18 ℃) is 0.0009g/100g. When there is water present, it absorbs carbon dioxide to form basic magnesium carbonate or magnesium carbonate.

Used as an analytical reagent, also used in the pharmaceutical industry, used in medicine as antacid and laxative, but also used in the production of sugar and magnesium oxide.

Magnesium hydroxide is a kind of inorganic flame retardant and smoke suppressant with high filling amount and additive type. When heated, decomposition occurs to absorb the heat on the surface of the burning material to achieve the flame retardant effect; at the same time, a large amount of water is released to dilute the oxygen on the surface of the burning material, and the active magnesium oxide generated by the decomposition will be attached to the surface of the combustible material, and further Chemicalbook step to prevent the combustion of the combustion process. In the whole flame retardant process, magnesium hydroxide does not produce any harmful substances, and decomposition of the product in the flame retardant at the same time, but also a large number of plastics, rubber and other polymer combustion to absorb the harmful gases and smoke, is an emerging environmentally friendly inorganic flame retardant.
2.Technical indicators:

Testing Parameters	Specification	Test Result
Physical state	Fine white powder	Pass
Magnesium Hydroxide (on dry basis) %	99.5 min.	99.6
Surface Water %	1.0 max	0.3
Calcium Oxide (CaO) %	0.1 max.	0.05
Acid Insolubles %	0.1 max.	0.06
Iron as Fe %	0.005 max.	0.0035
Loss on Ignition %	29-33	31
Sulphates as [SO₄]^2- %	0.1 max.	0.06
Chloride as Cl- %	0.1 max.	0.078
Arsenic ppm	10 max.	1
Heavy Metal(as Pb) ppm	20 max.	10
Laser Size, um	D50: 3	D50: 1.7
Bulk Density, g/cm3	0.5 - 0.7	0.58