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History, Occurrence, and Uses Physical Properties Production Reactions
Molybdenum structure
Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:

Molybdenum Properties

Melting point:
2622 °C
Boiling point:
4825 °C
10.3 g/mL at 25 °C(lit.)
refractive index 
2.81 (740 nm)
Flash point:
-23 °C
storage temp. 
Flammables area
H2O: soluble
Specific Gravity
5.0 μΩ-cm, 20°C
Water Solubility 
Insoluble inwater. Soluble innitric acid andsulfuric acid. Slightly soluble inhydrochloric acid.
Air Sensitive
Stable. Powder is flammable.
CAS DataBase Reference
7439-98-7(CAS DataBase Reference)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  F,Xi,N,Xn
Risk Statements  36/38-11-67-65-62-51/53-48/20-38
Safety Statements  26-36/37/39-16-9-62-61-36/37
RIDADR  UN 3264 8/PG 3
WGK Germany  3
RTECS  QA4680000
HazardClass  4.1
PackingGroup  III
HS Code  81029600
Signal word:
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H228 Flammable solid Flammable solids Category 1
Category 2
P210, P240,P241, P280, P370+P378
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P240 Ground/bond container and receiving equipment.
P241 Use explosion-proof electrical/ventilating/lighting/…/equipment.
P280 Wear protective gloves/protective clothing/eye protection/face protection.

Molybdenum price More Price(225)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 266892 Molybdenum powder, <150 μm, 99.9% trace metals basis 7439-98-7 100g $62.3 2018-11-13 Buy
Sigma-Aldrich 203823 Molybdenum powder, <150 μm, 99.99% trace metals basis 7439-98-7 100g $83.4 2018-11-13 Buy
Alfa Aesar 000876 Molybdenum wire, 0.07mm (0.003in) dia, 99.95% (metals basis) 7439-98-7 50m $63.7 2018-11-16 Buy
Alfa Aesar 000932 Molybdenum powder, -250 mesh, 99.9% (metals basis) 7439-98-7 5g $27.7 2018-11-16 Buy
Strem Chemicals 42-0010 Molybdenum wire (99.97%) 7439-98-7 100cm $94 2018-11-13 Buy

Molybdenum Chemical Properties,Uses,Production

History, Occurrence, and Uses

Molybdenum was first identified as a distinct element by Swedish chemist Karl Wilhelm Scheele in 1778. The metal was isolated by Hjelm in 1782 by reduction of its oxide with carbon. Moissan in 1895 isolated the metal in highly purified form by electrolytic reduction of its oxide and studied many of its physical and chemical properties. The element derived its name in 1816 from the word molybdos, meaning a soft mineral that appeared like lead.
Molybdenum does not occur in nature in free elemental form. Its most important ore is molybdenite, MoS2, from which the metal is obtained commercially. Other ores are powellite (calcium tungstomolybdate), Ca(MoW)O4, and wulfenite (lead molybdate), PbMoO4. The metal is an essential nutrient for plants and is found in trace amounts in some plants such as peas and beans, which absorb it from soil. Also, molybdenum is found in many natural petroleum oils.
The largest quantities of molybdenum produced are consumed in the steel industry. The metal is incorporated to steel to impart high resistance and hardness to the steel and to improve its mechanical properties. In the chemical industry, molybdenum compounds are used widely in coloring agents and solid lubricants. Molybdenum compounds are used also as catalysts in many oxidation-reduction reactions and in petroleum refining for production of high-octane gasoline. The metal also is used as the starting material to prepare many of its salts. Important commercial uses of molybdenum compounds are discussed separately under their individual headings.

Physical Properties

Silvery-white metal or grayish-black powder; cubic crystalline structure; density 10.22 g/cm3; melts at 2,623°C; vaporizes at 4,639°C; vapor pressure 1 torr at 2,830°C and 5 torr at 3,120°C; compressibility 3.6x10–7 cm2/kg at 20°C; electrical resistivity 5, 15, and 32 microhm–cm at 0°C, 400°C and 1,000°C, respectively; insoluble in water.


Molybdenum is recovered primarily from its sulfide ore, molybdenite, MoS2. It also is produced, although to a much lesser extent, from the tungsten ore wulfenite, which yields lead molybdate, PbMoO4. The first phase of the recovery process generally involves concentration of the ore, because ore coming from the mine is very lean and usually contains less than one percent molybdenum. Molybdenite at first is concentrated by flotation which concentrates the MoS2 over 90%. If wulfenite is used as a source material, concentration is usually done by hydraulic methods.
The concentrated molybdenite ore is then roasted in air, converting molybdenum sulfide to molybdenum trioxide MoO3. This is harvested in high purity by sublimation. An alternative is to leach molybdenite concentrate with dilute ammonia solution, which converts the metal to ammonium molybdate, (NH4)2MoO4. Molybdenum trioxide or ammonium molybdate product is then heated with hydrogen at elevated temperatures from 500 to 1,150°C in a furnace to produce molybdenum powder.


Molybdenum is very stable to oxygen at ambient temperatures. However, when heated in air or oxygen to red heat the metal readily converts to its trioxide, MoO3:
2Mo + 3O2 → 2MoO3
Heating the finely divided metal with its trioxide at 750°C makes molybdenum pentoxide, Mo2O5:
Mo + MoO3 + O2 → Mo2O5
When heated in steam at 800°C, the metal is converted to its dioxide, MoO2:
Mo + 2H2O → MoO2 + 2H2
Molybdenum combines with fluorine gas at ordinary temperatures forming colorless hexafluoride, MoF6:
Mo + 3F2 → MoF6
In the presence of oxygen, an oxyfluoride MoOF4 is obtained:
2Mo + O2 + 4F2 → 2MoOF4
Reactions with chlorine and bromine occur only at elevated temperatures. With chlorine the product is molybdenum pentachloride:
2Mo + 5Cl2 → 2MoCl5
When bromine vapor is passed over molybdenum metal at 600 to 700°C in an atmosphere of nitrogen, the product is trimeric molybdenum dibromide (trimolybdenum hexabromide) (Mo3Br6):
3Mo + 3Br2 → Mo3Br6
Two other bromides are also obtained from the elements. These are molybdenum tribromide, MoBr3, and molybdenum tetrabromide, MoBr4. MoBr3, a black solid, is obtained by heating the elements at 350 to 400°C.


Molybdenum is an essential trace mineral associated with several enzyme systems required for the normal body functions. Mine workers have developed symptoms of molybdenosis. The significantly expanding or softening property of the material makes it useful in applications that involve intense heat, including the manufacture of aircraft parts, electrical contacts, industrial motors, and filaments.

Chemical Properties

grey metal

Chemical Properties

Molybdenum is a silvery-white metal or dark gray or black powder with a metallic luster.

Physical properties

Molybdenum is in the middle of the triad elements of group 6. These three metals (fromperiods 4, 5, and 6) are chromium, molybdenum, and tungsten, which, in their pure states,are relatively hard, but not as hard as iron. They are silvery-white as pure metals, and they havesimilar oxidation states. Their electronegativity is also similar—Cr = 1.6, Mo = 1.8, and W =1.7—which is related to their reactivity with nonmetals.
Molybdenum is malleable and ductile, but because of its relatively high melting point, it isusually formed into shapes by using powder metallurgy and sintering techniques.
Molybdenum’s melting point is 2,617°C, boiling point = 4,612°C, and its density is 10.22g/cm3.


There are 36 isotopes of molybdenum, ranging in atomic weights from Mo-83to Mo-115. Of the seven isotopes considered stable, one (Mo-100) is radioactive and isconsidered stable because it has such a long half-life (0.95×10+19 years). The proportionsof the seven stable isotopes contributing to molybdenum’s natural existence onEarth are as follows: Mo-92 = 14.84%, Mo-94 = 9.25%, Mo-95 = 15.92%, Mo-96 =16.68%, Mo-97 = 9.55%, Mo-98 = 24.13%, and Mo-100 = 9.63%.

Origin of Name

Molybdenum is derived from the Greek word molybdos, meaning lead. At one time, the mineral molybdaena (later called molybdenite) was believed to be a variety of lead ore.


Molybdenum is the 54th most abundant element on Earth. It is relatively rare and is foundin just 126 ppm in the Earth’s crust. Its major ore is molybdenite (MoS2), which is mined inColorado in the United States and is found too in Canada, Chile, China, England, Norway,Sweden, Mexico, and Australia. Moldybdenum is also found in two less important ores: wulfenite(PbMoO4) and powellite ([Ca(MoW)O4]. These ores are usually found in the same sitesalong with tin and tungsten ores.
Molybdenite ore is very similar to graphite, and they have been mistaken for each otherin the past.


Given that molybdenum is located between chromium and tungsten in group 6, it chemicallyresembles a cross between these two partner elements. The three related elements donot occur as free elements in nature, but rather are found in minerals and ores. Their metal(elemental) radius size increases from chromium = 44 to molybdenum = 59 to tungsten = 60,which is related to their electronegativity and results in their using electrons in shells inside theouter shell during metallic bonding. This is a major characteristic of the transition of elementsfrom metals to nonmetals.
Molybdenum oxidizes at high temperatures but not at room temperatures. It is insolublein acids and hydroxides at room temperatures. At room temperatures, all three metals(chromium, molybdenum, and tungsten) resist atmospheric corrosion, which is one reasonchromium is used to plate other metals. They also resist attacks from acids and strong alkalis,with the exception of chromium, which, unless in very pure form, will dissolve in hydrochloricacid (HCl).


Peter Jacob Hjelm (1746–1813) is given credit for discovering molybdenum in 1781despite the fact that his paper was not published until 1890. He followed the advice of CarlWilhelm Scheele (1742–1786), who isolated and identified molybdenum, but incorrectlythought it was an element related to lead.
Although some reference works do give Scheele credit, most do not credit him for thediscovery of either molybdenum or the other elements he “discovered,” such as oxygen andmanganese.
Scheele did not receive credit for discovering oxygen two years before Joseph Priestley(1733–1804) announced his discovery and was given the credit. Scheele’s publisher wasnegligent in getting his work published in time. (There is a lesson in this story for all youngscientists—keep completed and accurate records of all your lab work and observations, andwhen you are sure of your experimental results, make sure to publish.)
The name “molybdenum” is derived from the Greek word for lead, molybdos, which standsfor any black minerals that historically could be used for writing. This also explains why theGreek word plumbago or “black lead” was used for graphite.


The high melting point of molybdenum is the major determinant of how it is used. Its chiefuse is as an alloy in the manufacture of engines of automobiles. “Moly-steel” contains up to8% molybdenum and can withstand high pressures and the relatively rapid changes of enginetemperatures (e.g. cold engine to hot and back again without the metal warping and with theability to withstand excessive expansion and contraction).
Its high melting point also makes it useful for metal electrodes in glassmaking furnaces.Molybdenum’s high resistance to electricity makes it useful in high-temperature filament wiresand in the construction of parts for missiles, spacecrafts, and nuclear power generators.
Molybdenum is also used as a catalyst in petroleum refining, as a pigment for paints andprinter’s ink, and as a high-temperature lubricant (molybdenum disulphide-MoS2) for use byspacecraft and high-performance automobiles.
In hospitals, radioisotope Mo-99, which decays into technetium-99, is given internally tocancer patients as a “radioactive cocktail.” Radioactive Tc-99 is absorbed by tissues of cancerpatients, and then x-ray-like radiation is used to produce pictures of the body’s internal organs.


In the form of ferromolybdenum for manufg special steels for tools, boiler plate, rifle barrels, propeller shafts; electrical contacts, spark plugs, x-ray tubes, filaments, screens and grids for radio tubes; in the production of tungsten; glass-to-metal seals; nonferrous alloys; in colloidal form as lubricant additive.


Molybdenum is largely used in steel industry.Its compounds are widely used incoloring agents, solid lubricants and ascatalysts. Molybdenum is an essential traceelement and a component of xanthine oxidase.This enzyme catalyzes the formationof urate. Molybdenum cofactor (Moco)-deficiencyis a lethal autosomal recessive disease.Moco-deficiency in humans can causeneurological damage, seizures and variousbrain dysmorphisms.
The sources of molybdenum include beans,dark green leafy vegetables, grains and hardtap water. Deficiencies of molybdenum arealmost unknown in human.


A transition element that occurs naturally in molybdenite (MoS2) and wulfenite (PbMoO4). It is used in alloy steels, lamp bulbs, and catalysts. The compound ammonium molybdate, dissolved in nitric acid, is used as a test for phosphates(V). Molybdenum sulfide (MoS2) is used in lubricants to enhance viscosity. Symbol: Mo; m.p. 2620°C; b.p. 4610°C; r.d. 10.22 (20°C); p.n. 42; r.a.m. 95.94.


Metallic element of atomicnumber 42, group VIB of the periodic table, aw95.94, valences = 2, 3, 4, 5, 6. Seven stable isotopes.

General Description

Molybdenum, a chemical element, is a hard, high-melting (refractory) high-density dark gray metal or black powder. Insoluble in water. Used to make structural alloys; used as a catalyst. Molybdenum dust and fumes can irritate the eyes and respiratory tract.

Reactivity Profile

Molybdenum is a reducing agent. In dust or powder form, Molybdenum may present a fire or explosion hazard under favoring conditions of particle size, dispersion and ignition. Bulk Molybdenum (rod, coil, sheet, etc.) is less reactive than dust or powder. Insoluble in hydrochloric acid or hydrofluoric acid solutions and in ammonia and sodium hydroxide solutions. Insoluble in dilute sulfuric acid solutions but soluble in concentrated sulfuric acid. Soluble in concentrated nitric acid. Incompatible with strong oxidizing agents such as bromine trifluoride, bromine pentafluoride, chlorine trifluoride, potassium perchlorate, nitryl fluoride, fluorine, iodine pentafluoride, sodium peroxide, lead dioxide.


Flammable in form of dust or powder.Lower respiratory tract irritant. Questionable car-cinogen.


The powder and dust forms of molybdenum are flammable. The fumes from some of thecompounds should not be inhaled or ingested.

Health Hazard

The toxicity of molybdenum in humans isconsidered to be low. Gout-like symptoms,hyperuricaemia and pneumoconiosis havebeen associated with excessive exposures.Selden et al. (2005) have reported a case ofhyperuricaemia and gouty arthritis in a youngman from occupational exposure to molybdenum.Momcilovic (1999) has cited a caseof acute clinical poisoning resulting from thedietary intake of molybdenum supplement ina male patient. A cumulative dose of 13.5 mgMo over a period of 18 days was attributed tocause acute psychosis with visual and auditoryhallucination and a series of petit malseizures. The symptoms decreased severalhours after the start of chelation therapy withcalcium ethylene diamine tetraacetic acid.However, 1 year after such Mo poisoning thepatient was diagnosed toxic encephalopathywith learning disability, depression, and posttraumaticdisorder. Spectral emission computertomography demonstrated evidence offrontal cortical damage of the brain.
Vyskocil and Viau (1999) assessed molybdenumtoxicity in humans and calculated the‘tolerable daily intake’ (TDI), ‘no observedadverse effect level’ (NOAEL) and the ‘lowestobserved adverse effect level’ (LOAEL)for molybdenum intake. The authors havecalculated a TDI of 0.009 mg Mo/kg/dayand a NOAEL and LOAEL of 0.9 and1.6 mg Mo/kg/day respectively. Their toxicologicalrisk analysis was based on animaldata.
Molybdenum toxicity has been found tobe associated with copper deficiency in thebody.
Thus, any copper deficiency arising eitherfrom inadequate dietary intake or from somedysfunction in copper metabolism that woulddeplete its level may contribute to greaterrisk of molybdenum toxicity in humans.

Agricultural Uses

Molybdenum (Mo) is a plant micronutrient, absorbed by the plant roots only in the form of molybdate ion MoO42- Molybdenum, is a vital component of the enzyme, nitrate reductase (a soluble molybdoflavoprotein) in Molybdenum is present in the chloroplasts of leaves. It is also a structural component of nitrogenase which plays an active role in nitrogen fixation by Rhiwbium, Azotobucter and some algae and actinomycetes. Molybdenum is also involved in the absorption and translocation of iron in plants.
Molybdenum is present in soils in extremely small quantities (about 2 ppm or less) which is adequate for plants. Its availability increases as the soil pH increases when the conversion of molybdenum oxide to molybdate is favored.
The presence of aluminum, iron and titanium in soil increases the absorption of molybdenum. Nitrate nitrogen encourages molybdenum uptake, while ammoniacal nitrogen reduces it. A heavy application of phosphatic fertilizers increases the uptake of molybdenum while that of sulphates has the reverse effect. The addition of lime increases the availability of molybdenum. A dose of concentrated soluble manganese and/or copper reduces molybdate absorption by plants.
When the molybdenum content of plants is less than 0.2 ppm, molybdenum deficiency occurs. The deficiency is determined by the ammonium oxalate extraction procedure. Acidic soils, fibrous peat soils and acidic sandy soils are generally molybdenum deficient. Molybdenum concentration is high at the soil surface, and decreases with depth; the deficiency is severe under dry soil conditions, probably owing to reduced diffusion or mass flow.
Molybdenum deficiency resembles nitrogen deficiency in legumes, because of the role molybdenum plays in nitrogen fixation. The deficiency causes stunting and yellowing of plants. In legume crops, the deficiency manifests itself by marginal scorching, curling and crinkling of leaves, the first symptom being an interveinal chlorosis followed by the plant turning pale yellow and becoming stunted.
Mo deficiency, manifested in cauliflower, is known as whiptail and that in cashew, the yellow leaf spot. The deficiency is most common in acidic sandy soils because of the leaching losses. Molybdenum availability is low in soils with high metal oxides. Cauliflower, Brussels sprouts, broccoli and citrus fruits are sensitive to low molybdate levels. Cotton, leafy vegetables, corn, tomato and sweet potato are moderately sensitive to lower molybdate levels.
Molybdenum deficiency also causes nitrate accumulation, thereby lowering the activity of ascorbic acid oxidase, known for activating enzymes, namely, nitrate reductase and xanthine oxidase.
Molybdenum deficiency can easily be corrected by adding 40 to 400g Mo/ha to the soil. It can also be corrected by a foliar spray of sodium molybdate or molybdic acid, or by coating seeds with sodium molybdate before planting. Even a 0.03% foliar spray on cashews can correct the deficiency. Soil is limed to increase plant uptake of molybdenum.
A trace of molybdenum as impurity in superphosphate is often adequate for plant growth. A material carrying at least 38% molybdenum, such as sodium molybdate, is employed to coat the seed, about 17 g/ha of which is used for legumes on molybdenumdeficient soils. Such seed treatment is the most practical way for augmenting the molybdenum content of the soil. Ammonium molybdate is recommended for potato at the rate of about 1 kg/ha for soil application, 0.5 kg in lo00 liters of water for sprays and 200 g for soaking seed tubers. A disease, called pencil point, in coconut can be cured with a 0.25 g/l of ammonium molybdate as a component of the fertilizer mixture.
Many fertilizers contain molybdenum. The common ones are ammonium molybdate (54%), sodium molybdate (39%) and molybdenum trioxide (66%) - the figures in brackets indicating the molybdenum percentage. Among these, only ammonium molybdate is recognized under the Fertilizer Control Order (FCO) in some countries (like India), although sodium molybdate is the most commonly recommended molybdenum carrier. Molybdenum is mixed with NPK fertilizer and then applied. It was demonstrated in Australia that soaking seeds in sodium molybdate solution before sowing was as effective as applying molybdenum in the fertilizer. In the United States, the seeds are often coated with sodium molybdate.
Molybdenum toxicity is associated with vein clearing, necrosis, and golden yellow dissolution in the middle of the lamina in plants because of the formation of molybdeocatechol complex. Excess of molybdenum is toxic to animals feeding on forage rich in molybdenum. Molybdenosis, is a cattle disease, caused by a copper and molybdenum imbalance in the diet, with the molybdenum content exceeding 5 ppm. Molybdenum toxicity provokes stunted growth and bone deformation in animals. This disease is also known as 'teart' in England and 'peat scow' in New Zealand. Injecting copper or adding copper fertilizer to the grazing areas can correct the imbalance.
As already mentioned, soils generally contain very low quantities of molybdenum. In most Indian soils (other than acidic soils), for instance, the total available molybdenum ranges from traces to a fraction of 1 ppm, and even with this minute quantity the soil exhibits no molybdenum deficiency.

Industrial uses

Molybdenum (Mo) is a silvery-white metal, occurring chiefly in the mineral molybdenite but also obtained as a by-product from copper ores. It is ductile, softer than tungsten, and is readily worked or drawn into very fine wire.
Its major use is in alloy steels, for example, as tool steels ( 10% molybdenum), stainless steel, and armor plate. Up to 3% molybdenum is added to cast iron to increase strength. Up to 30% molybdenum may be added to iron-, cobalt-, and nickel-base alloys designed for severe heat- and corrosion-resistant applications. It may be used in filaments for lightbulbs, and it has many applications in electronic circuitry.
Molybdenum forms mirrors and films on glass when it is produced by gas-phase reduction or decomposition of volatile molybdenum compounds in glass tubes. Molybdenum trioxide (MoO3) dissolves in glass, allowing strong binding of molten glass with preoxidized metal surfaces. Annealing is very effective, with little or no difference in thermal expansion at the metal glass interface. Molybdenum found early use in filaments for electric lightbulbs and later in the construction of electronic devices (for example, in vacuum tubes, contacts, electrodes, and transistors).

Safety Profile

Poison by intratracheal route. Mutation data reported. An experimental teratogen. Experimental reproductive effects. Flammable or explosive in the form of dust when exposed to heat or flame. Violent reaction with oxidants (e.g., bromine trifluoride, bromine pentafluoride. chlorine trifluoride, potassium perchlorate, nitryl fluoride, fluorine, iodine pentafluoride, sodium peroxide, lead dioxide). When heated to decomposition it emits toxic fumes of Mo.

Potential Exposure

Most of the molybdenum produced is used in alloys: steel, stainless steel; tool steel; case iron; steel mill rolls; manganese, nickel, chromium, and tungsten. The metal is used in electronic parts (contacts, spark plugs, X-ray tubes, filaments, screens, and grids for radios); induction heating elements; electrodes for glass melting; and metal spraying applications. Molybdenum compounds are utilized as lubricants; as pigments for printing inks; lacquers, paints, for coloring rubber animal fibers, leather, and as a mordant; as catalysts for hydrogenation cracking; alkylation, and reforming in the petroleum industry; in Fischer Tropsch synthesis; in ammonia production; and in various oxidation-reduction and organic cracking reactions; as a coating for quartz glass; in vitreous enamels to increase adherence to steel; in fertilizers, particularly for legumes; in electroplating to form protective coatings; and in the production of tungsten. Hazardous exposures may occur during high-temperature treatment in the fabrication and production of molybdenum products, spraying applications; or through loss of catalyst. MoO3 sublimes above 800℃.

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit.


UN3089 Metal powders, flammable, n.o.s., Hazard Class: 4.1; Labels: 4.1-Flammable solid.


Metallic Mo is a combustible solid in form of dust or powder and is potentially explosive. Dust or powder may form explosive mixture with air. Soluble compounds: alkali metals; sodium, potassium, molten magnesium. Insoluble compounds: Violent reaction with oxidizers, nitric acid; sulfuric acid. Forms explosive mixture with potassium nitrate. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides.

Waste Disposal

Recovery is indicated whenever possible. Processes for recovery of Molybdenum from scrap, flue dusts, spent catalysts and other industrial wastes have been developed.

Molybdenum Preparation Products And Raw materials

Raw materials

Preparation Products

Molybdenum Suppliers

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