American Molecules - USA

Bentonite USP NF Grade Supplier Exporter Manufacturers' Representative

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CAS Number: 1302-78-9

Molecular Formula: Varies
Molecular Weight: Varies

Bentonite Suppliers

Bentonite USP NF Grade Specifications:
Bentonite CAS 1302-78-9

Bentonite is a native, colloidal, hydrated aluminum silicate.

A. X-Ray Diffraction: to pass the test.

Test preparation: Transfer 8.0 g to a 250-mL beaker containing 100 mL of dilute hydrochloric acid (1 in 25), mix, and cover with a watch glass. Boil gently, with occasional stirring, for 15 min without allowing excessive foaming. Pass the hot supernatant through a rapid-flow filter paper into a 200-mL volumetric flask, and wash with four 25-mL portions of hot dilute hydrochloric acid (1 in 25), collecting the washings in the volumetric flask. Cool the combined filtrates to room temperature and add dilute hydrochloric acid (1 in 25) to volume. Transfer 25 mL of this solution to a generator flask and dilute with water to 35 mL.
Standard preparation: Transfer 5 mL of Standard Arsenic Solution (5 µg) to a generator flask and dilute with water to 35 mL.
Analysis: Proceed as directed in the chapter, determining the absorbances.
Acceptance criteria: NMT 5 ppm; the absorbance due to any red color from the Test preparation does not exceed that produced by the Standard preparation.
Lead: to pass the test by Atomic absorption spectrophotometry. --- (40 µg/g).
Microbial Enumeration Tests and Tests for Specified Microorganisms: Meets the requirements of the test for absence of Escherichia coli.
Analysis: Disperse 4.0 g in 200 mL of water, mixing vigorously to facilitate wetting.
Acceptance criteria: 9.5 to 10.5
Loss on Drying:
Analysis: Dry at 105C for 2 h.
Acceptance criteria: 5.0% to 8.0%
Gel Formation: Mix 6 g with 300 mg of magnesium oxide. Add the mixture, in several divided portions, to 200 mL of water contained in a blender of approximately 500-mL capacity. Blend thoroughly for 5 min at high speed, transfer 100 mL of the mixture to a 100-mL graduated cylinder, and allow to remain undisturbed for 24 h. NMT 2 mL of supernatant appears on the surface.
Swelling Power: To 100 mL of water contained in a glass-stoppered cylinder of 100-mL capacity add 2 g in portions, dropping it upon the surface of the water, and allow each portion to settle before adding the next. The mass at the bottom gradually swells until it occupies an apparent volume of NLT 24 mL at the end of a 2-h period.
Fineness of Powder: Sprinkle 2 g on 20 mL of water contained in a mortar. Allow to swell, disperse evenly with a pestle, and dilute with water to 100 mL. Pour the suspension through a No. 200 standard sieve and wash the sieve thoroughly with water. No grit is felt when the fingers are rubbed over the wire mesh of the sieve.

Purified Bentonite USP NF Grade Specifications:

Purified Bentonite is a colloidal montmorillonite that has been processed to remove grit and nonswellable ore components.

A. X-Ray Diffraction: To pass the test.

Aluminum Content and Magnesium Content: To pass the test by Atomic Absorption Spectroscopy.
Acceptance criteria: The ratio of the aluminum content to the magnesium content is 3.5 to5.5.

Arsenic: To pass the test. ---- NMT 3 µg/g.
Lead: To pass the test by Atomic Absorption Spectroscopy. --- (15 µg/g).
Microbial Enumeration Tests and Tests for Specified Microorganisms: Its total aerobic microbial count does not exceed 1 x 1000 cfu/g, and it meets the requirements of the test for absence of Escherichia coli.
Sample suspension: 50 mg/mL
Acceptance criteria: 9.0 to 10.0
Loss on Drying:
Analysis: Dry at 110C to constant weight.
Acceptance criteria: NMT 8.0%
Viscosity: To pass the test. ---- 40 to 200 centipoises.
Acid Demand:
Sample: After determining Loss on Drying, weigh a quantity of Purified Bentonite equivalent to 5.00 g.
Analysis: Disperse the Sample in 500 mL of water with the aid of a suitable blender fitted with a 1-L jar. Using a stopwatch, designate zero time. With constant mixing, add 3.0-mL portions of 0.100 N hydrochloric acid at 5, 65, 125, 185, 245, 305, 365, 425, 485, 545, 605, 665, and 725 s, and add a 1.0-mL portion at 785 s. Determine the pH potentiometrically at 840 s.
Acceptance criteria: NMT 4.0
Packaging and Storage: Preserve in tight containers.

We also supply Bentonite of BP Ph Eur Grade.

Please visit SDS Safety Data Sheet of Bentonite Suppliers.

American Molecules, also known as is a distributor, supplier and manufacturers' representative of all types of Pharmaceuticals, Functional Ingredients, Excipients and Specialty Chemicals in Texas USA. Our principals manufacture supply and export USP NF BP, Ph Eur, etc grades of chemicals pure and reagent grade, mineral fortifiers, FCC food grade. Tailor made particle size and customized specifications are offered. The principal's facility is having one or more of the certifications like FDA approval and GLP, cGMP, ISO9001, ISO14001, ISO/IEC 17025, ISO22000, FSSC 22000, ISO45001, FSSAI, Kosher, HALAL, COPP, WHO-GMP certified and Written Confirmation (WC) for export to Europe is available. The manufacturers suppliers and exporters observe WHO Good Manufacturing Practices and Good Laboratory Practices.

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Suppliers and Manufacturers' Representative:
American Molecules - USA
9910 Bent Oak Dr
Houston, TX 77040, USA
Call Toll Free: 1-855-55-AMMOL 1-855-552-6665