Molybdenum disulfide

Molybdenum disulfide (CAS 1317-33-5), also known as MoS2, is a naturally occurring inorganic sulfide mineral processed into fine powder.

Where is Molybdenum disulfide used?

• Solid-state lubricant and surface modifier that reduces friction and wear between moving metal surfaces without liquid carriers
• Metalworking and heavy machinery: compounded into greases, pastes and dry-film lubricants for high-load, high-temperature bearing surfaces
• Cutting tools for high-speed turning and milling, where it increases tool life
• Ceramic coatings to provide lubricity and extend the life of mechanical components
• Additive to greases, forming a non-adhesive colloidal state that increases lubricating power and extreme-pressure performance
• Hydrodesulfurization catalysts
• Coatings: anti-friction coatings for fasteners, gears and aerospace components
• Rubber and elastomer compounding: improves surface slip and reduces mold adhesion
• Cosmetics: pigment and slip agent in pressed powders
• Its dark gray tone and platelet structure contribute to texture and coverage in color cosmetics.

Good to know: Purity levels and particle size distribution are the primary differentiators between commercial offerings. Particle size determines suitability across lubrication, coating and cosmetic applications.

Formulation notes

• Dissolves in aqua regia, hot sulfuric acid and nitric acid; insoluble in diluted acids.

Typical specification

• Offered in purities of 98%, 99%, 99.5% and 99.9%.
• At 99.9 wt% purity, maximum content of Fe is 0.05 wt%, SiO2 is 0.05 wt% and H2O is 0.05 wt%.
• Grade MoS2-2: Fisher sub-sieve sizer (F.S.S.S.) 3 to 4 µm, particle size by SEM less than 1 to 100 µm, laser median particle size less than 30 µm, bulk density 1.3 g/cm³.
• Supplied in technical, technical fine and superfine grades.

Regulatory status

• Classified as Acute Toxicity Category 4.
• Carries hazard statement H332: harmful if inhaled.

Storage, packaging and handling

• Store in a dry and cool environment, away from direct sunlight.

Frequently asked questions about Molybdenum disulfide

Can molybdenum disulfide be used in plastic compounds?

Yes; it is added to plastics to create a composite that enhances strength and reduces friction.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.