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Zinc Stearate BP USP NF Manufacturers
For MSDS Sheet Click MSDS of Zinc Stearate BP USP NF Manufacturers
British Pharmacopoeia 2009
Zinc Stearate BP
Zinc Stearate BP
(C17H35CO2)2Zn -- 632 -- 557-05-1
DEFINITION
Zinc stearate [(C17H35COO)2Zn; Mr 632] may contain varying proportions of zinc palmitate
[(C15H31COO)2Zn; Mr 576.2] and zinc oleate [(C17H33COO)2Zn; Mr
628].
Content
10.0 per cent to 12.0 per cent
of Zn.
CHARACTERS
Appearance
Light, white or almost white,
amorphous powder, free from gritty particles.
Solubility
Practically insoluble in water
and in anhydrous ethanol.
IDENTIFICATION
A. Freezing point
(2.2.18):
minimum 53 °C, determined on the residue obtained in the preparation of solution
S (see Tests).
B. Neutralize 5 ml of solution
S to red litmus paper R with strong sodium hydroxide solution. The
solution gives the reaction of zinc.
TESTS
Solution S
To 5.0 g Zinc Stearate add 50 ml of
ether
R and 40 ml of a 7.5 per cent V/V solution of cadmium- and
lead-free nitric acid in distilled water. Heat under a reflux
condenser until dissolution is complete. Allow to cool. In a separating funnel,
separate the aqueous layer and shake the ether layer with 2 quantities, each of
4 ml, of distilled water R. Combine the aqueous layers, wash with 15 ml
of ether R and heat on a water-bath until ether is completely eliminated.
Allow to cool and dilute to 50.0 ml with distilled water (solution S).
Evaporate the ether layer to dryness and dry the residue at 105C.
Appearance of solution
Solution S is not more
intensely coloured than reference solution.
Appearance of solution of
fatty acids
Dissolve 0.5 g of the residue
obtained in the preparation of solution S in 10 ml of chloroform R. The
solution is clear and not more intensely coloured than reference
solution.
Acidity or alkalinity
Shake 1.0 g with 5 ml of
ethanol (96 per cent) R and add 20 ml of carbon dioxide-free water
and 0.1 ml of phenol red solution R. Not more than 0.3 ml of 0.1 M
hydrochloric acid or 0.1 ml of 0.1 M sodium hydroxide is required to
change the colour of the indicator.
Acid value of the fatty
acids
195 to 210.
Chlorides
Maximum 250 ppm.
Sulphates
Maximum 0.6 per cent.
Cadmium
Maximum 5.0 ppm.
Atomic absorption spectrometry
To pass the test
Lead
Maximum 25.0 ppm.
Atomic absorption
To pass the test
Zinc Stearate USP NF
Zinc Stearate
USP NF
Octadecanoic acid, zinc salt.
Zinc stearate [557-05-1]
Zinc Stearate is a compound of zinc with a mixture of solid organic acids obtained from fats, and consists chiefly of variable proportions of zinc stearate and zinc palmitate. It contains the equivalent of not less than 12.5 percent and not more than 14.0 percent of ZnO.
Identification—
A:
Mix 25 g Zinc Stearate with 200 mL
of hot water, add 60 mL of 2 N sulfuric acid, and boil until the fatty acids
separate as a transparent layer. Cool the mixture, and remove the solidified
layer of fatty acids: a portion of the water layer responds to the tests for Zinc.
B:
Place the separated
fatty acids obtained in Identification test A in a filter wetted
with water, and wash with boiling water until free from sulfate. Collect the
fatty acids in a small beaker, allow to cool, pour off the separated water, then
melt the acids, filter into a dry beaker while hot, and dry at 105 for 20
minutes: the fatty acids congeal at a temperature not below 54.
Arsenic—
The limit is
1.5 ppm.
Lead—
The limit is
0.001%.
Alkalies and alkaline
earths— Mix 2.0 g with 50 mL of water, add 10 mL of hydrochloric acid, boil
until the solution is clear, filter while hot, and wash the separated fatty
acids with about 50 mL of hot water. Render the combined filtrate and washings
alkaline with 6 N ammonium hydroxide, add ammonium sulfide TS to precipitate the
zinc completely, dilute with water to 200 mL, mix, and filter. To 100 mL of the
clear filtrate add 0.5 mL of sulfuric acid, evaporate to dryness, and ignite to
constant weight: the weight of the residue does not exceed 10 mg (1.0%).
Zinc Stearate BP USP NF Manufacturers at:
MUBY CHEMICALS GROUP
DONGRI-CHINCHBUNDER, MUMBAI 400009, INDIA
TEL: (OFFICE)
91-22-23770100, 91-22-23726950, 91-22-23774610, 23723564.
e-mail: info@mubychem.com
