Encyclopedia / Sulphate / Other Inorganic Chemicals / Pharmaceutical Intermediates

Barium sulfate

CAS：7727-43-7
MW:233.3896
MF：BaO4S

Barium sulfate is available as odourless, tasteless, white or yellowish crystals or powder or polymorphous crystals. It is stable and insoluble or negligibly soluble in water, and on burning, it may produce sulphur oxides. It reacts violently with aluminium powder. It occurs naturally as mineral barite, barytes. It has wide use as inert filler and pigment extender in paints, primers, inks, plastics, floor tiles, paper coatings, polymer fibres, and rubber. It is used as the semi-transparent base (lake) for organic pigments and as a thixotropic weighting mud in oil well drilling. Barium sulphate is a contrast agent that is used to help x-ray diagnosis of problems in areas of the upper GI tract, like the oesophagus, the stomach, and/ or the small intestine. The raw barium sulphate has wide applications such as in the manufacture of lithopone, a white pigment in the manufacture of photographic paper, wallpaper and glassmaking, in battery plate expanders, and in heavy concrete for radiation shield. View more+

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Names and ldentifier
Properties
Use and Manufacturing
Safety and Handling
Msds
Other Information
Computational chemical data
Related Questions
Realated Product Infomation

1. Names and Identifiers

1.1 Name: Barium sulfate

1.2 Synonyms: 231-784-4; Barite; barite,artificial; baritogendeluxe; baritop; baritop100; baritopgpowder; baritopp; Barium salt of sulfuric acid; barium100; bariumandreu; EINECS 231-784-4; MFCD00003455; Precipitated Barium Sulfate; Sulfuric acid, barium salt (1:1);

1.3 CAS No.: 7727-43-7

1.4 CID: 24414

1.5 EINECS: 231-784-4

1.6 Molecular Formula: BaO4S

1.7 Inchi: InChI=1S/Ba.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2

1.8 InChkey: TZCXTZWJZNENPQ-UHFFFAOYSA-L

1.9 Canonical Smiles: [O-]S(=O)(=O)[O-].[Ba+2]

1.10 Isomers Smiles: [O-]S(=O)(=O)[O-].[Ba+2]

2. Properties

2.1 Solubility: water: insoluble

2.2 Appearance: solid

2.3 Storage: Barium sulfate should be kept stored in its original sealed glass container with proper security when not in use. Barium sulfate should be stored in a cool, dry, ventilated area, away from incompatible materials and foodstuff containers. The containers need to be protected against physical damage and checked regularly for leaks.

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2.4 Color/Form: Fine, heavy powder or polymorphous crystals
White, orthorhombic crystals
White or yellowish powder
OPAQUE POWDER

2.5 Decomposition: When heated to decomposition it emits toxic fumes of /sulfur oxides/.

2.6 Odor: Odorless

2.7 PH: 5% suspension in water is neutral to litmus paper

2.8 Water Solubility: 0.0022 g/L (50 oC)

2.9 Spectral Properties: Index of refraction: 1.64

2.10 Stability: Stable.

2.11 StorageTemp: Storage temperature: no restrictions.

3. Use and Manufacturing

3.1 Definition: ChEBI: A metal sulfate with formula BaO4S. Virtually insoluble in water at room temperature, it is mostly used as a component in oil well drilling fluid it occurs naturally as the mineral barite.

3.2 Description

Barium sulfate, with the chemical formula BaSO4, is identified by the CAS number 7727-43-7. It is a white crystalline solid that is virtually odorless and tasteless. Barium sulfate is insoluble in water, alcohol, and concentrated acids. Its basic structure consists of one barium atom bonded to a sulfate group, forming a compound widely used in various industries. Safety information indicates that barium sulfate poses minimal health risks, but prolonged exposure may cause irritation. It is essential to handle it with care and avoid inhalation or direct contact.

Applicable Fields

Medical Imaging: Barium sulfate is extensively used as a contrast medium in medical imaging procedures, particularly in X-ray examinations of the digestive system. Its purpose is to enhance the visibility of organs and tissues, aiding in the diagnosis of abnormalities. The mechanism of action involves its ability to absorb X-rays, resulting in a higher contrast between the organs and surrounding tissues.

Oil and Gas Industry: In the oil and gas sector, barium sulfate is employed as a weighting agent in drilling fluids. Its purpose is to increase the density of the fluid, preventing blowouts and stabilizing the borehole. The mechanism of action is based on the dense nature of barium sulfate, which helps maintain pressure and control during drilling operations.

Storage

ConditionsStore in a cool, dry place, away from incompatible substances.
Barium sulfate has its chemical formula BaSO4. It is colorless or white orthorhombic crystals with relative molecular mass of 233.4, the relative density of 4.5 (15 ℃), the melting point of 1580 ℃, and the Refractive index of 1.637. Upon being heated to 1149 ℃, it will become monoclinic crystalline when the refractive index is 1.649. It is almost insoluble in water with the solubility being 0.00022 at 18 ℃ and 0.0041 at 100 ℃. It is slightly soluble in concentrated sulfuric acid and soluble in

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3.3 Potential Exposure: Barium sulfate is used as an opaquemedium in radiography; as a mud weighting material in oilwell drilling; in paper coating; as a paint pigment.

3.4 Usage: Barium sulfate (BaSO4), as mentioned, is used in medicine as an opaque liquid medium to block X-rays when ingested, thus providing an image of ulcers and intestinal problems. It is also used in the manufacture of paints, rubber, and plastics.

4. Safety and Handling

4.1 Exposure Standards and Regulations: Barium sulfate is an indirect food additive for use only as a component of adhesives.

4.2 Other Preventative Measures: ... EFFORTS SHOULD ... BE MADE TO REDUCE ATMOSPHERIC CONCN OF BARITE DUST TO A MINIMUM. /BARITE DUST/
SRP: Contaminated protective clothing should be segregated in such a manner so that there is no direct personal contact by personnel who handle, dispose, or clean the clothing. Quality assurance to ascertain the completeness of the cleaning procedures should be implemented before the decontaminated protective clothing is returned for reuse by the workers. Contaminated clothing should not be taken home at end of shift, but should remain at employee's place of work for cleaning.
SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
The worker should wash daily at the end of each work shift.

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4.3 DisposalMethods: 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.
Barite (barium sulfate) may be recovered from drilling muds for re-use as an alternative to disposal.

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4.4 Safety Profile: Questionablecarcinogen with experimental tumorigenicdata. Mutation data reported. A relativelyinsoluble salt used as an opaque medium inradtography. Soluble impurities can lead totoxic reactions. Heating with aluminum canproduce an explosion. Incompatible withaluminum and potassium. When heated todecomposition it emits toxic fumes of SOx.

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4.5 Formulations/Preparations: Powder: Baraflave (with flavoring agent); ORAL: Powder, for suspension: 92% wt/wt Oratrast & 95% wt/wt Barosperse 110, Ultra-R & 96% wt/wt TonoJug 2000, Tonopaque; Powder, for suspension, high-density, low-viscosity: 85% wt/wt E-Z-HD & 95% wt/wt Baricon & 98% wt/wt HD 200 Plus; Suspension: 1.2% wt/vol (1.2% wt/wt) Readi-CAT & 1.5% wt/vol (1.5% wt/wt) Baro-CAT & 2% wt/vol (2% wt/wt) Readi-CAT 2 & 3% wt/wt Esopho-CAT esophageal cream & 4.6% wt/vol (4.6% wt/wt) E-Z-Cat Concentrate & 5% TomoCat Concentrate, TomoCat 1000 Concentrate & 50% wt/vol (35.7% wt/wt) EntroBar & 55% wt/vol (37.5% wt/wt) Liquid E-Z-Paque & 100% wt/vol (56% wt/wt) Esophotrast esophageal cream & 120% wt/vol (60% wt/wt) E-Z-Paste esophageal cream; Tablets: 650 mg Bar-Test; ORAL or RECTAL: Powder, for suspension: 91% wt/wt Intropaque & 92% wt/wt Micropaque & 92.5% wt/wt Barotrast & 94% wt/wt Polibar & 95% wt/wt Barosperse, E-Z-Paque & 96% wt/wt Baroloid, Mixture III, Veri-O-Pake & 97% wt/wt Barodense, Sol-O-Pake; Suspension: 1.2% wt/vol (1.2% wt/wt) PrepCat & 60% wt/vol (40% wt/wt) Liquid Barosperse, Novopaque or 72% wt/vol (45% wt/wt) & 100% wt/vol (56% wt/wt) Liquid Polibar; Suspension, high-density, low viscosity: 85% wt/vol (50% wt/wt) HD 85 & 100% wt/vol (56% wt/wt) Liquipake; RECTAL: Powder, for suspension: 96% wt/wt Micropaque RD & 98% Barobag (with admin set); Suspension: 5% wt/vol (4.7% wt/wt) EneCat (with admin set) & 85% wt/vol (50% wt/wt) EneMark, EneSet (with admin set); Suspension, high-density, low-viscosity: 100% wt/vol (56% wt/wt) E-Z-AC, Flo-Coat & 103% wt/vol (57% wt/wt) Epi-Stat 57 (with admin set) & 110% wt/vol (58% wt/wt) Liquid Polibar Plus & 116% wt/vol (61% wt/wt) Epi-Stat 61 (with admin set) & 125% wt/vol (62% wt/wt) HiTone & 150% wt/vol (70% wy/wt) Epi-C.
Barium sulfate combinations: 6 g powder, for oral soln, Sodium Bicarbonate 3.1 g (Sparkle Granules); 312 g powder, for suspension, Barium Sulfate 98% w/w (HD 200 Plus) BaroSet Air Contrast Stomach Kit; 20 ml solution, oral, Lidocaine Hydrochloride 2% (Xylocaine Viscous); 500 ml suspension, oral, Barium Sulfate 50% w/v (35.7% w/w) (EntroBar); 2 Tablets, Metoclopramide Hydrochloride 10 mg (Reglan) EntroKit Enteroclysis Kit (with or without catheter).
Commercially barium sulfate is sold both as natural barite ore and as a precipitated product.
Lithopone, a white powder containing 20% barium sulfate, 30% zinc sulfide and less than 8% zinc oxide.
USP grade
Grade: Technical, dry, pulp, bleached, ground, floated, natural, chemically pure, USP, X-ray
Baritop 100: A suspension containing 100% wt/vol of barium sulfate. Baritop G Powder: Contains barium sulfate 97%.

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4.6 Incompatibilities: May act as an oxidizer. Reacts withreducing agents such as hydrides, potassium, phosphorus oraluminum. Aluminum powder1heat may be violent; possiblyexplosive.

4.7 Protective Equipment and Clothing: Employees working on ... barite leaching with sulfuric acid should be supplied with acid resistant clothing and suitable hand and face protection.
Employees should be provided with and required to use impervious clothing, gloves, face shields (eight inch minimum), and other appropriate protective clothing necessary to prevent repeated or prolonged skin contact with barium carbonate, barium chloride, barium nitrate, or liq containing these cmpd. ... Employees should be provided with and required to use dust and splash proof safety goggles where barium carbonate, barium chloride, barium nitrate, or liq containing these cmpd may contact the eyes.
Wear appropriate personal protective clothing to prevent skin contact.
Wear appropriate eye protection to prevent eye contact.
Eyewash fountains should be provided in areas where there is any possibility that workers could be exposed to the substance; this is irrespective of the recommendation involving the wearing of eye protection.
Facilities for quickly drenching the body should be provided within the immediate work area for emergency use where there is a possibility of exposure. [Note: It is intended that these facilities provide a sufficient quantity or flow of water to quickly remove the substance from any body areas likely to be exposed. The actual determination of what constitutes an adequate quick drench facility depends on the specific circumstances. In certain instances, a deluge shower should be readily available, whereas in others, the availability of water from a sink or hose could be considered adequate.]

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4.8 Reactivities and Incompatibilities: Excess red phosphorus will burn admixed with barium ... sulfate if primed at a high temp with potassium nitrate-calcium silicide mixture.
THE REDUCTION OF BARIUM SULFATE ... BY ALUMINUM IS ATTENDED BY VIOLENT EXPLOSIONS.
Phosphorus, aluminum [Note: Aluminum in the presence of heat can cause an explosion].

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4.9 Toxicity: Inorganic Compound; Barium Compound; Household Toxin; Industrial/Workplace Toxin; Synthetic Compound

5. MSDS

2.Hazard identification

2.1 Classification of the substance or mixture

Not classified.

2.2 GHS label elements, including precautionary statements

Pictogram(s)	No symbol.
Signal word	No signal word.
Hazard statement(s)	none
Precautionary statement(s)
Prevention	none
Response	none
Storage	none
Disposal	none

2.3 Other hazards which do not result in classification

none

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6. Computed Properties

Molecular Weight：233.3896g/mol
Molecular Formula：BaO₄S
Compound Is Canonicalized：True
XLogP3-AA：233.856977
Monoisotopic Mass：233.856977
Complexity：62.2
Rotatable Bond Count：0
Hydrogen Bond Donor Count：0
Hydrogen Bond Acceptor Count：4
Topological Polar Surface Area：88.6
Heavy Atom Count：：6
Defined Atom Stereocenter Count：0
Undefined Atom Stereocenter Count：0
Defined Bond Stereocenter Count：0
Undefined Bond Stereocenter Count：0
Isotope Atom Count：0
Covalently-Bonded Unit Count：2
CACTVS Substructure Key Fingerprint：AAADcQAAOABAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==

7.Other Information

Usage: Barium sulfate has wide range of applications. It is primarily used in oil well drilling fluid, and as filler in the paint and varnish industry. It is one of the major constituents of the pigment Lithiopone and the white pigment for paints. It improves the resistance against acid and acidity for plastics when employed as filler. Further it is employed as a component in strobe pyrotechnic compositions, and as a coating for photographic papers to improve the effectiveness of the image. Baryta, a thin layer of barium sulfate, is used to make the papers bright for ink-jet printing. In the chemical and pharmaceutical industry, it is used as a catalyst support when selective hydrogenations are required, for e.g. in Rosenmund reduction (Pd on barium sulfate). In colorimetry, barium sulfate is used as a diffuser to measure light sources. In the medical field, barium sulfate suspension is used clinically as a radiocontrast agent for X-ray imaging and other diagnostic procedures. In biomaterials research, it is one of the components utilized in the preparation of acrylic bone cements.

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Usage: Barium sulfate has wide range of applications. It is primarily used in oil well drilling fluid, and as filler in the paint and varnish industry. It is one of the major constituents of the pigment Lithiopone and the white pigment for paints. It improves the resistance against acid and acidity for plastics when employed as filler. Further it is employed as a component in strobe pyrotechnic compositions, & as a coating for photographic papers to improve the effectiveness of the image. Baryta, a thin layer of barium sulfate, is used to make the papers bright for ink-jet printing. In the chemical and pharmaceutical industry, it is used as a catalyst support when selective hydrogenations are required, for e.g. in Rosenmund reduction (Pd on barium sulfate). In colorimetry, barium sulfate is used as a diffuser to measure light sources. In the medical field, barium sulfate suspension is used clinically as a radiocontrast agent for X-ray imaging and other diagnostic procedures. In biomaterials research, it is one of the components utilized in the preparation of acrylic bone cements.

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