Magnesium stearate

Reported in EPA TSCA Inventory.

ACGIH TLV: TWA 10 mg/m³
DOT Classification:  4.2; Label: Spontaneously Combustible

The IUPAC name of Magnesium stearate is magnesium octadecanoate. With the CAS registry number 557-04-0, it is also named as Octadecanoic acid, magnesium salt. The product's category is Cosmetic Ingredients & Chemicals. It is white powder which is soluble in hot ethanol solution and insoluble in water. In addition, this chemical has good skin adhesion and lubricity. Besides, it should be sealed in the container and stored in the cool and dry place.

The other characteristics of this product can be summarized as: (1)ACD/LogP: 8.22; (2)# of Rule of 5 Violations: 1; (3)ACD/LogD (pH 5.5): 7.42; (4)ACD/LogD (pH 7.4): 5.63; (5)#H bond acceptors: 2; (6)#H bond donors: 1; (7)#Freely Rotating Bonds: 16; (8)Flash Point: 162.4 °C; (9)Enthalpy of Vaporization: 63.84 kJ/mol; (10)Boiling Point: 359.4 °C at 760 mmHg; (11)Vapour Pressure: 8.58E-06 mmHg at 25°C; (12)Rotatable Bond Count: 30; (13)Exact Mass: 590.512453; (14)MonoIsotopic Mass: 590.512453; (15)Topological Polar Surface Area: 80.3; (16)Heavy Atom Count: 41; (17)Complexity: 196.

Preparation of Magnesium stearate: It can be obtained by magnesium sulfate and sodium stearate which is prepared by sodium hydroxide and stearic acid.
C₁₇H₃₅COOH+NaOH→C₁₇H₃₅COONa+H₂O
2C₁₇H₃₅COONa+MgSO₄→Mg[CH₃(CH₂)₁₆COO)]₂+Na₂SO₄ 

Uses of Magnesium stearate: It often used as a diluent in the manufacture of medical tablets, capsules and powders. It is not only used to bind sugar in hard candies, but also used as a heat stabilizer of PVC, lubricating agent of ABS, amino resins, phenolic resins and urea formaldehyde resin. In addition, it is a common ingredient in baby formulas. Besides, tis chemical can used in the powder products to enhance adhesion and lubrication.

When you are using this chemical, please be cautious about it as the following:
It is irritating to eyes, respiratory system and skin. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable gloves and eye/face protection.

People can use the following data to convert to the molecule structure. 
1. SMILES:[Mg+2].[O-]C(=O)CCCCCCCCCCCCCCCCC.[O-]C(=O)CCCCCCCCCCCCCCCCC
2. InChI:InChI=1/2C18H36O2.Mg/c2*1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20;/h2*2-17H2,1H3,(H,19,20);/q;;+2/p-2