EK-S03
High-temperature curing agent (methylhydrogen polysilazane)
Methylhydrogen polysilazane with molecular weight ≈2500 — a silicon-nitride-based high-temperature curing agent for bake-cured films and crosslinking systems.
FORM
Liquid resin
APPEARANCE
Pale yellow to colorless transparent liquid
CURING
180-250 °C · 1 h
Documents
TDS · SDS
Ceramic precursors · Additives (flame retardant)
The material
How this grade works and where it fits — exact parameters are defined in the TDS.
EK-S03 methylhydrogen polysilazane is a polymer whose main chain is built of Si—N bonds. Owing to its distinctive structure, under high-temperature conditions it can convert into SiCNO, SiCN or silica ceramics, making it an important precursor for the preparation of Si—C—N ceramics. The Si—H bonds provide active sites for hydrosilylation and can be used to modify resins containing unsaturated olefins. The Si—N and Si—H bonds react readily with hydroxyl-containing substances, so the product can serve as an amine-type curing agent; it can also be used to modify hydroxyl-containing resins — such as phenolic, epoxy, alkyd and acrylic resins — to improve their temperature resistance and weatherability.
Choose this grade as a high-temperature curing agent: silicon-nitride (Si–N) chemistry with molecular weight ≈2500, bake-cured at 180–250 °C, -30…300 °C service.
Final fit is confirmed during technical review — send your substrate, operating environment and application process, and the team will confirm this grade or point you to a closer one.
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.
Recommended applications for this grade:
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
>98%
—
Viscosity
45-60 s (Tu-4 cup)
—
Max service temperature
-30 to 300 °C service · 600 °C peak
Depends on cure & film build
Curing conditions
180-250 °C · 1 h
Per application process
Recommended film thickness
10±5 µm
—
Shelf life
12 months (storage at 5–30 °C)
Storage conditions apply
Service temperature. Maximum withstand temperature 600 °C; can be used long-term at 350 °C. Coatings formulated with temperature-resistant nano-fillers can withstand direct impingement by flame or high-temperature gas streams. Depending on the temperature resistance of the substrate, the temperature resistance of the coating varies accordingly; the coating withstands hot-cold cycling and thermal shock (note: the product supplied differs according to the substrate).
Coating Film Properties
Color and appearance: Pale yellow to colorless transparent liquid — GB-T 1721-79
Viscosity (Tu-4 flow cup): 45-60 s — GB-T 1723-1993
Quality specification (assay): ≥95% — Q/YX 10-2023
Solids content ((120±2) °C): >98% — GB/T 1725-2007
Density (g/mL): 1.05±0.01 — GB/T 6750-2007
Relative molecular mass: >8×10⁴ — GB/T 27843-2011
Hardness (pencil): ≥6H — GB/T 6739-2006
Adhesion: Grade 0 (cross-cut) — GB-T 9286-1998
Salt spray resistance: >500 h — GB-T 10125-2021
Basic Application Parameters
Coating solids content: Varnish viscosity is relatively high; dilution to 50% is recommended for application
Theoretical coverage (m²/kg): 12–28
Dry film thickness (µm): 10±5
Working time (pot life) (h): 24
Diluent: Alkanes, esters, ethers, etc.
Flash point (°C): <22 (solvent flash point)
Volatility: Not readily volatile
Curing temperature (°C): 180-250
Curing time (h): 1
Instantaneous maximum temperature resistance (°C): 600
Recommended service temperature (°C): -30 to 300
Warehouse storage (°C): 0–30
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
Carbon steel, stainless steel, cast iron, aluminum alloys, titanium alloys, high-temperature alloy steels, glass-ceramic panels, ceramics, cement and similar materials are all suitable. Note: the coating formulation differs according to the substrate; within a certain range, it can be adjusted and matched to the specific substrate and its service conditions.
Storage, packaging & transport
Store in accordance with national regulations. The storage environment should be dry, cool and well ventilated, away from heat and ignition sources. Packaging containers must be kept tightly sealed and placed with care.
The storage temperature should be maintained between 5 °C and 30 °C; the shelf life is 12 months.
Opened, partially used coating must be stored with the container lid tightly resealed.
Prepared coating that has not been used up cannot be reclaimed; dispose of it in accordance with local regulations.
Product past its shelf life may be used only after testing confirms it conforms to specification.
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.
Standard process: Surface cleaning → abrasive roughening → cleaning and blowing off → EK-S03 treatment → curing
Abrasive roughening. Before coating, sand or blast the substrate surface to remove rust, dust, dirt and other contaminants adhering to the surface of the workpiece. Surface roughening has a considerable influence on coating performance: Sa2.5 is optimal, and the minimum is St3 with no mill scale (GB/T 30790.4-2014), so pay close attention to this step.
Cleaning. Use a dedicated cleaning agent or degreaser to remove oil, dust and other residues remaining on the abrasively roughened surface.
Substrate drying. Before coating, ensure that the substrate surface is dry and clean.
Coating preparation. The product is one-component; take the required quantity and filter it through a 120-mesh screen before use.
Coating application. For laboratory spraying, a spray gun with a 1.0 orifice gives better appearance and uniformity. After curing, the coating is somewhat hydrophobic and oleophobic, so recoating (applying repeat coats) is not recommended.
Curing. After spraying, allow 10 minutes for surface drying, then hold at 180 °C for 60 minutes to cure (for coatings used below 400 °C), or hold at 250 °C for 60 minutes (for coatings used above 400 °C).
Note: This product is a one-component heat-curing product; once the container has been opened, use the coating within 24 hours. During longer breaks in application, clean the application tools thoroughly to prevent them from setting solid. It is recommended to complete spraying in a single pass, with a dry film thickness not exceeding 15 µm; otherwise the coating film performance will decline.
More grades
Browse the full catalogue by category, or send your requirements — we will recommend a grade for your case.
Organic Polysilazane Resins
→
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
→
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.