EK-S8003
Hexamethyldisilazane (HMDS), CAS 999-97-3
Ultra-high-purity HMDS, assay ≥99.5% and chloride ≤10 ppm; silylating agent and photoresist adhesion promoter.
FORM
Liquid silazane monomer
APPEARANCE
Colourless transparent liquid
CURING
Not applicable — supplied as a monomer, not as a curing resin
Documents
TDS · SDS
The material
How this grade works and where it fits — exact parameters are defined in the TDS.
Hexamethyldisilazane is a colourless transparent liquid, soluble in organic solvents. On contact with air it is rapidly hydrolysed to trimethylsilanol and hexamethyldisiloxane, so containers must be kept closed. The grade is specified for ultra-high purity with low silanol and low siloxane content and a chloride level at or below 10 ppm, which is what makes it usable in pharmaceutical synthesis and in semiconductor processing.
Choose this grade where purity governs the result — pharmaceutical intermediates and semiconductor processing, where the ≥99.5% assay and ≤10 ppm chloride specification matter more than price. Note the closed-cup flash point of 11.4 °C: this is a Class 3 dangerous good and needs corresponding handling and shipping.
Suitable for
Industrial applications within the TDS parameters
Metal, glass, ceramic and stone substrates — per grade
Professional application and curing processes
Not intended for
Consumer or DIY use — industrial B2B supply only
Conditions outside the parameters defined in the TDS
Food-contact or medical use unless explicitly confirmed
Applications
Recommended application areas for this grade, based on its TDS. Application fit is confirmed during technical review.
Hydrophobic surface treatment agent for fumed silica. Silylating agent in the synthesis of amikacin, penicillin, cephalosporin, fluorouracil and various penicillin derivatives. Adhesion promoter for photoresists in the semiconductor industry. Additive for silicon carbide fibre, improving heat resistance and strength. Anti-settling agent for coatings. Preparation of organosilicon compounds.
Technical data
Key values from this grade's TDS. The complete measured data set follows below; the official document is available on request.
PROPERTY
TYPICAL VALUE
NOTES
Solid content
Assay ≥99.5% · chloride ≤10 ppm
—
Viscosity
Density 0.770–0.780 g/ml at 20 °C · refractive index 1.408 ± 0.002 at 20 °C
—
Max service temperature
Boiling point 125 °C at 760 mmHg. Closed-cup flash point 11.4 °C — Class 3 dangerous goods
Depends on cure & film build
Curing conditions
Not applicable — supplied as a monomer, not as a curing resin
Per application process
Recommended film thickness
Not applicable — not supplied as a coating
—
Shelf life
12 months (cool, dry storage)
Storage conditions apply
Hexamethyldisilazane. CAS 999-97-3, molecular formula C₆H₁₉NSi₂, molecular weight 161.39. Assay ≥99.5%. Chloride content ≤10 ppm. Density 0.770–0.780 g/ml at 20 °C. Boiling point 125 °C at 760 mmHg. Closed-cup flash point 11.4 °C. Refractive index 1.408 ± 0.002 at 20 °C. Shelf life 12 months. Classified as Class 3 dangerous goods.
Data above is taken from the manufacturer’s TDS. Request the official document via the documents section below.
Substrates & storage
Compatibility and handling essentials — confirmed per grade in the TDS and SDS.
Suitable substrates
Steel and stainless steel
Aluminium and other metals
Glass and ceramics
Stone and mineral surfaces
Not applicable — this grade is a raw material for synthesis and surface treatment, not a coating.
Storage, packaging & transport
Supplied in 1 L aluminium bottles. Factory standard packaging per the technical description: 25 L plastic drums and 200 L iron or plastic drums, plus a 1 t IBC container. Custom packaging on request. This grade is classified as Class 3 dangerous goods and must be shipped in line with its properties and with national and local regulations. Keep containers closed, in a cool, dry, well-ventilated place away from open flame and water, out of direct sunlight and rain. Shelf life 12 months from the production date; after that the material may be used once it passes re-inspection.
Packaging
1 kg / 5 kg / 25 kg (grade-dependent)
Transport classification
Per SDS
Application process
General guidance — exact parameters are provided in the TDS and Application Guide.
01
Surface preparation
Clean, degrease and prepare the substrate.
02
Application
Spray, dip or wipe depending on grade.
03
Curing
Cure per the TDS conditions.
04
Quality control
Verify film build and adhesion.
Handled as a chemical raw material — dosing and process conditions depend on the target system and are confirmed during technical review.
More grades
Browse the full catalogue by category, or send your requirements — we will recommend a grade for your case.
Organic Polysilazane Resins
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Inorganic Polysilazane / Ceramic Precursors
→
Modified Polysilazane Coatings
→
Ready-to-use Ceramic Coatings
→
High-temperature Ceramic Coatings
→
Electrical Insulation Coatings
→
Fluorosilanes & Surface Modifiers
→
Adhesives
→
Additives
→
Polycarbosilane
→
Cyclosilazanes
→
Silazane Monomers
→
SiC Fibers
→
Ordering & logistics
Common questions from procurement and engineering teams.
What packaging formats are available?
Standard packaging is 1 kg, 5 kg and 25 kg containers, grade-dependent. Other formats, minimum order quantity, lead times, shipping terms and stock availability are confirmed on request.
What is the minimum order quantity for this product?
MOQ depends on the packaging format — confirmed by our team for your grade and volume.
What happens after I send an inquiry?
Our technical team reviews your requirement and responds with a recommendation, the relevant documents and next steps.
How do I get a quotation?
Include your estimated volume and application in the inquiry — a quotation follows the technical review.
How is the product shipped?
Packaging, transport classification and shipping details are provided per SDS — request packaging and shipping information with your inquiry.