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Magnesium hydroxide(CAS No. 1309-42-8)

Magnesium hydroxide H2MgO2 (cas 1309-42-8) Molecular Structure

1309-42-8 Structure

Identification and Related Records

【Name】
Magnesium hydroxide
【CAS Registry number】
1309-42-8
【Synonyms】
Magnesia 50H
Magnesium dihydroxide
Magnesium(II) hydroxide
Magnifin A
Magnifin H 10
Magnifin H 5
Magshield S
Magshield UF-NB 10
Magstar
Magstar 5
Marinco H 1241
MgZ 1
Mint-O-Mag
N 0(curing accelerator)
N 6 (hydroxide)
Nittomagu S
Odomag
PT 25ST
PZ 1SP
PhillipsMilk of Magnesia Liquid
Reachim
S/G 84
SP (hydroxide)
SX 30MS
StanMag Hydroxide B
StarBrand 100
Magnesum hydroxide
10A (hydroxide)
200-06H
96HS
B 54
Combustrol 500
DSB 100
FD 905U
FM 70
FR 20/100
FR 20S10
Finemag SN-L
FloMag HUS
H 5
Hydrofy N
KX 4S
KX 8S(B)
Ki 22-5B
Kisuma1
Kisuma 2
Kisuma 4AF
Kisuma 5
Kisuma 5A-N
Kisuma 5L
Kisuma 5Q
Kisuma 5X
Kiyouwasuimagu F
MGZ5
MH 3
MH 30
MS 4 (hydroxide)
Maglux
Maglux ST
Maglux STF 2
【EINECS(EC#)】
215-170-3
【Molecular Formula】
H2MgO2 (Products with the same molecular formula)
【Molecular Weight】
58.33
【Inchi】
InChI=1S/Mg.2H2O/h;2*1H2/q+2;;/p-2
【InChIKey】
VTHJTEIRLNZDEV-UHFFFAOYSA-L
【Canonical SMILES】
[OH-].[OH-].[Mg+2]
【MOL File】
1309-42-8.mol

Chemical and Physical Properties

【Appearance】
odourless white powder
【Density】
2.36g/cm3
【Melting Point】
350 C ( Decomposes)
【Boiling Point】
100°Cat760mmHg
【Flash Point】
will not burn
【Water】
0.9 MG/100 ML (18 oC)
【Solubilities】
0.9 mg/100 mL (18 oC) in water
【Color/Form】
Amorphous powder
White, hexagonal crystals
Granules
【Stability】
Stable.
【Storage temp】
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
【Spectral properties】
Index of refraction: 1.559, 1.580
【Computed Properties】
Molecular Weight:58.31968 [g/mol]
Molecular Formula:H2MgO2
H-Bond Donor:2
H-Bond Acceptor:2
Rotatable Bond Count:0
Exact Mass:57.990521
MonoIsotopic Mass:57.990521
Topological Polar Surface Area:2
Heavy Atom Count:3
Formal Charge:0
Complexity:2.8
Isotope Atom Count:0
Defined Atom Stereocenter Count:0
Undefined Atom Stereocenter Count:0
Defined Bond Stereocenter Count:0
Undefined Bond Stereocenter Count:0
Covalently-Bonded Unit Count:3

Safety and Handling

【Hazard Codes】
Xi: Irritant;
【Risk Statements】
R36/37/38
【Safety Statements 】
26-36-37/39
【Safety】

Moderately toxic by intraperitoneal route. Human systemic effects: chlorine level changes, coma, somnolence. Incompatible with maleic anhydride, phosphorus. See also MAGNESIUM COMPOUNDS.
Hazard Codes:?IrritantXi
Risk Statements: 36/37/38?
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36-37/39?
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.?
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
RTECS: OM3570000
F: 3-9
Hazardous Substances Data: 1309-42-8(Hazardous Substances Data)

【Sensitive】
Air Sensitive
【Transport】
50kgs
【Formulations/Preparations】
MILK OF MAGNESIA USP, IS AN AQUEOUS SUSPENSION OF MAGNESIUM HYDROXIDE CONTAINING 7.0-8.5% OF MG(OH)2. EACH MILLILITER IS CAPABLE OF NEUTRALIZING APPROX 2.7 MEQ OF ACID. ...MAGNESIUM HYDROXIDE IS ALSO AVAIL AS MAGNESIA TABLETS...GENERALLY CONTAIN 325 MG EACH, WHICH CAN NEUTRALIZE 11.2 MEQ OF ACID.
USP; 250 ML & 500 ML BOTTLES WITH ALUMINUM HYDROXIDE GEL; 250 ML, 375 ML, 500 ML & 1 L BOTTLES.
SUSPENSION OF 30% MAGNESIUM HYDROXIDE IN WATER: HYDRO-MAGMA.
MAGNESIUM HYDROXIDE DRUG AVAILABLE GENERICALLY: POWDER; TABLETS 300 & 600 MG.
VET: PRIMARILY IN LAXATIVE MIXTURES FOR SUSPENSION IN LARGE QUANTITIES OF WATER, OCCASIONALLY IN BOLUS, & OCCASIONALLY AS MILK OF MAGNESIA; MAGMA MAGNESII, CREAM OF MAGNESIA, MIXTURE OF MAGNESIUM HYDROXIDE, & MISTURA MAGNESII HYDROXIDI (APPROX AN 8% AQUEOUS SOLUTION).
MAGNESIUM HYDROXIDE IS USUALLY MARKETED IN COMBINATION WITH OTHER ANTACIDS.
GRADES: TECHNICAL, NF, FCC.
VET: MAGNALOX BOLUSES, EACH BOLUS CONTAINS: MAGNESIUM HYDROXIDE 27 G; GINGER 200 MG, & CAPSICUM 50 MG.
A mixture of salts, available as Maalox, Mylanta, Gelusil, and Aludrox, contains magnesium hydroxide, Mg(OH)2, and variable amounts of aluminum oxide in the form of aluminum hydroxide and hydrated aluminum oxide, ie, 2.9-4.2% magnesium hydroxide and 2.0-2.4% aluminum oxide, Al2O3, for a mixture of 4.9-6.6% combined magnesium hydroxide and aluminum oxide. This mixture may contain a flavoring and antimicrobial agents in a total amount not to exceed 0.5% ... .
【Exposure Standards and Regulations】
Antacid products for over-the-counter (OTC) human use. Magnesium hydroxide is included on this list of specific active ingredients.
【Reactivities and Incompatibilities】
Phosphorus boiled with alkaline hydroxides yields mixed phosphines which may ignite spontaneously in air. /Alkaline hydroxides/
ALKALI & OTHER ALKALINE EARTH COMPD...MAGNESIUM COMPD...CAUSE EXPLOSIVE DECOMP OF MALEIC ANHYDRIDE.
【Specification】

?Magnesium hydroxide ,?its cas register number is 1309-42-8. It also can be called?Alcanex NHC 25 ; Asahi Glass 200-06 ;
?Baschem 12 ; Combustrol 500 ; Duhor ; Ebson RF ; FloMag H ; FloMag HUS ; Hydro-mag MA ; Hydrofy N?; Kisuma 4AF ; Kyowamag F ; Lycal 96 HSE ; Magmesia hydrate ; MagneClear 58 ; Magnesia magma ; Magox ; Marinco H ; Milk of magnesia ; Mint-O-Mag ; Nemalite ; Phillips Magnesia Tablets . Magnesium hydroxide (CAS NO.1309-42-8) is a odourless white powder.

【Report】

Reported in EPA TSCA Inventory.

【Disposal Methods】
SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

Use and Manufacturing

【Use and Manufacturing】
Methods of Manufacturing

REACTION OF CALCIUM HYDROXIDE WITH SEA WATER WHICH HAS BEEN PURIFIED TO REMOVE COLLOIDAL PARTICLES, CARBON DIOXIDE, AND SALTS OF OTHER METALS
...FROM MAGNESIUM CHLORIDE OR SULFATE & SODIUM HYDROXIDE...US 3127241 (1964 TO DOW). INDUSTRIAL METHOD FOR PRODUCING MAGNESIUM HYDROXIDE HAVING VARIABLE PARTICLE SIZES...US 3232708 (1966 TO FMC).
Precipitation from a solution of a magnesium salt by sodium hydroxide or precipitation from seawater with lime.
Dead Sea Periclase (DSP, Mishor Rotem, Israel) converts magnesium chloride into MgO by spray-roasting, then hydrates the MgO to Mg(OH)2.
Magnesite is acidified to produce MgCl2 and subsequent MgO of 99% purity, which is converted to magnesium hydroxide by hydration.
U.S. Exports

(1985) 1.81X10+10 g (est) /MAGNESIUM COMPOUNDS/
U.S. Imports

(1985) 1.36X10+11 g (est) /MAGNESIUM COMPOUNDS/
U.S. Production

(1974) 8.46X10+10 GRAMS (USE)
(1985) 5.72X10+11 g (est) /MAGNESIUM COMPOUNDS/
【Usage】

Medication: antacid, cathartic.

Biomedical Effects and Toxicity

【Pharmacological Action】
- Substances that counteract or neutralize acidity of the GASTROINTESTINAL TRACT.
【Therapeutic Uses】
Antacids; Cathartics
MAGNESIA MAGMA ACTS AS ANTACID OR LAXATIVE, DEPENDING ON DOSAGE EMPLOYED. TEN ML...NEUTRALIZES APPROX 270 ML OF 0.1 NORMAL HYDROCHLORIC ACID. ...OFTEN USED IN COMBINATION WITH ALUMINUM HYDROXIDE GEL SINCE IT TENDS TO OVERCOME MILD CONSTIPATING EFFECTS OF LATTER &...CONTRIBUTES ITS OWN ANTACID EFFECT.
WHEN THE DOSE IS IN EXCESS OF THAT REQUIRED TO NEUTRALIZE THE ACID, INTRAGASTRIC PH MAY REACH 8 OR 9. ACID REBOUND FOLLOWING MG(OH)2 IS CLINICALLY INSIGNIFICANT.
...USED MAINLY FOR...LAXATIVE PROPERTIES, THE DOSE & FREQUENCY OF ADMIN ARE DETERMINED BY NUMBER OF SUBSTITUTIONS FOR ALUMINUM OR CALCIUM SALTS THAT RESULT IN NORMAL STOOL CONSISTENCY.
Magnesium hydroxide, or milk of magnesia, is one of the constituents of the universal antidote for poisoning.
...IT HAS A SOMEWHAT PROLONGED DURATION OF ACTION. ...ITS NEUTRALIZING ACTION IS NEARLY AS PROMPT & COMPLETE AS THAT OF SODIUM BICARBONATE.
MEDICATION (VET): MILD LAXATIVE, ANTACID, CARMINATIVE. FOR USE IN SIMPLE INDIGESTION OF CATTLE. /MAGNALOX BOLUSES/
PROPHYLACTIC TREATMENT WITH MG(OH)2 WAS INSTITUTED IN 56 CONSECUTIVE CASES WITH RENAL CA STONES. THE MEAN STONE EPISODE RATE DURING TREATMENT WAS 0.03 STONES/YR COMPARED TO 0.8 STONES/YR BEFORE TREATMENT WAS INSTITUTED. TREATMENT WITH MG(OH)2 REDUCES RECURRENCE RATE.
...A randomized, controlled crossover study was conducted in /13/ healthy adult male human volunteers taking no medications. Subjects received an average of 5.0 mg/kg elemental iron orally followed 1 hr later by either oral administration of 4.5 g of Mg(OH)2/g ingested elemental iron or no treatment. ...After a 2-wk washout period, the subjects were enrolled in the alternative trial arm. Individual baseline diurnal variation in serum iron levels was determined over a 12-hr period on the day prior to each trial. Area under time-concentration curves (AUCs) were calculated, and the AUC due to experimental iron ingestion (deltaAUC) was determined by subtracting the baseline diurnal AUC from the experimental AUC for each subject. ...Mean +/- SEM for deltaAUC due to experimental iron ingestion followed by treatment with Mg(OH)2, 78 +/- 23 umol(hr)/L, was significantly less than that followed by no treatment, 144 +/- 33 umol(hr)/L (p=0.03 by signed rank test). Magnesium hydroxide, administered 1 hr post-iron ingestion at an oral dose of 4.5 g/g elemental iron ingested, significantly reduced iron absorption during a 12-hr period following simulated mild iron overdose in healthy adult human volunteers. [Wallace KL, et al; Acad Emerg Med 5 (10): 961-965 (1998)]
【Biomedical Effects and Toxicity】
ALTHOUGH MG(OH)2 IS CLASSIFIED AS A NONSYSTEMIC ANTACID, 5 TO 10% OF MAGNESIUM CAN BE ABSORBED... ORDINARILY THE ABSORBED MAGNESIUM ION IS RAPIDLY EXCRETED BY KIDNEY. IN NORMAL PERSONS, ABSORPTION IS ATTENDED BY LITTLE OR NO DANGER OF SYSTEMIC ALKALOSIS, BUT URINE MAY BECOME ALKALINE.
...EMPTIED SLOWLY FROM THE STOMACH, PROLONGING ITS ANTACID ACTION. ...ABOUT 5-15% OF INGESTED MAGNESIUM IS ABSORBED, & THIS IS READILY EXCRETED IN THE URINE IF KIDNEY FUNCTION IS NORMAL.

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