Magnesium hydroxide CAS#1309-42-8

Long-Lasting Antacid & Laxative Action:Reacts slowly with stomach acid and retains water in the intestine, providing sustained relief from acidity and constipation.


Effective Flame Retardant & Smoke Suppressant:Decomposes endothermically at 332 °C, releasing water and magnesia to reduce heat and suppress smoke in fire-resistant applications.


Versatile Industrial Applications:Widely used in wastewater treatment, fuel additives, and as a raw material for producing various magnesium salts.


Stable Aqueous Suspension:Forms a uniform suspension in water with controlled solubility, ensuring reliable performance in pharmaceutical and industrial formulations.



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Product Description

Product Description of ‌Magnesium hydroxide CAS#1309-42-8

As the main component of Milk of Magnesia, magnesium hydroxide acts as a long-acting antacid and laxative. It also functions as an effective flame retardant and smoke suppressant, decomposing endothermically at 332 °C. Additionally, it is applied in wastewater treatment, fuel additives, and magnesium salt manufacturing.


Product Application of Magnesium hydroxide CAS#1309-42-8

Magnesium hydroxide is a high-performance flame retardant for plastics, rubber and coatings. It is widely used in flue gas desulfurization and acidic wastewater treatment as a replacement for caustic soda and lime. It also serves pharmaceuticals, food processing, electronics and chemical raw material production. Owing to its higher decomposition temperature, it is ideal for high-temperature processing of common polymers and flame-retardant paints.

Product Information

Parameters


Melting point350 °C (lit.)
density2,36 g/cm3
storage temp.Room Temperature
solubility5 M HCl: 0.1 M, clear, yellow
formpowder
colorWhite
Specific Gravity2.36
OdorOdorless
PH10.4(1 mM solution);10.4(10 mM solution);10.4(100 mM solution)
PH Range9.5 - 10.5
Water Solubility0.9 mg/100 mL (18 ºC)
λmaxλ: 260 nm Amax: 0.030
λ: 280 nm Amax: 0.025
SensitiveAir Sensitive
Merck145,670
Solubility Product Constant (Ksp)pKsp: 11.25
Stability:Stable.
Cosmetics Ingredients FunctionsABSORBENT
BUFFERING
InChIKeyVTHJTEIRLNZDEV-UHFFFAOYSA-L
LogP-1.380 (est)
CAS DataBase Reference1309-42-8(CAS DataBase Reference)
NIST Chemistry ReferenceMagnesium hydroxide(1309-42-8)
EPA Substance Registry SystemMagnesium hydroxide (Mg(OH)2) (1309-42-8)


Safety Information


Hazard CodesXi
Risk Statements36/37/38
Safety Statements26-36-37/39-24/25
WGK Germany-
RTECSOM3570000
F3月9日
TSCAYes
HS Code28161000
Hazardous Substances Data1309-42-8(Hazardous Substances Data)
ToxicityLD50 oral in rat: 8500mg/kg


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A: We implement a strict supplier qualification and periodic audit system. A Certificate of Analysis (COA)—issued by the original manufacturer—is provided with every shipment. We also welcome pre-shipment inspections conducted by internationally recognized third-party agencies such as SGS, BV, or ITS. Should the test results fail to meet the standards specified in the contract, you have the right to reject the goods or request a replacement.

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