EK-S05
High-molecular polysilazane binder
Silazane-based binder for steel-surface coating systems; liquid ceramic precursor for SiCN, SiCNO and SiO2 ceramics and fiber composites.
FORM
Liquid precursor
APPEARANCE
Light yellow to colorless transparent liquid
CURING
250 °C · 1 h
Documents
TDS · SDS
Ceramic precursors · Additives · High-temperature adhesives
The material
How this grade works and where it fits — exact parameters are defined in the TDS.
EK-S05 polysilazane is a high-quality liquid ceramic precursor for SiCN, SiCNO and SiO2 ceramic materials, silicon nitride fibers, composites and related applications. Applied to steel surfaces operating at 200–700 °C, it provides decorative, protective, anti-rust and anti-corrosion functions. The coating is used for protective coating of metallurgical, petroleum and chemical-industry blast furnaces, inner and outer walls of hot-blast stoves, chimneys, flues, exhaust pipes, heat exchangers and other metal surfaces requiring high-temperature corrosion protection.
The Si—N bond reacts readily with hydroxyl-containing substances, so the product can serve as an amine-type curing agent and can also modify hydroxyl-containing resins to improve heat resistance and weatherability — for example phenolic, epoxy, alkyd and acrylic resins.
Choose this grade as the general-purpose liquid ceramic precursor for SiCN, SiCNO and SiO2 systems: -30…700 °C service with 1000 °C peaks; also usable as an amine-type curing agent and resin modifier.
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
>96%
—
Viscosity
11 s (Tu-4 cup)
—
Max service temperature
-30 to 700 °C service · 1000 °C peak
Depends on cure & film build
Curing conditions
250 °C · 1 h
Per application process
Recommended film thickness
8±5 µm
—
Shelf life
6 months (storage at 5–30 °C)
Storage conditions apply
Service temperature. Maximum withstand temperature 1000 °C; suitable for long-term service at 700 °C. Coatings compounded with heat-resistant nano-fillers withstand direct flame or high-temperature gas-flow scouring. The coating's temperature resistance varies according to the temperature capability of the substrate; resistant to hot–cold cycling and thermal shock (note: the product supplied differs according to the substrate).
Coating Film Properties
Color and appearance: Light yellow to colorless transparent liquid — GB-T 1721-79
Viscosity (Tu-4 flow cup): 11 s — GB-T 1723-1993
Quality specification: ≥95% — Q/YX 10-2023
Solids content ((120±2) °C): >96% — GB/T 1725-2007
Density (g/mL): 0.91±0.01 — GB/T 6750-2007
Relative molecular mass: 2×10⁴ — GB/T 27843-2011
Hardness (pencil): ≥4H — GB/T 6739-2006
Adhesion: Grade 0 (cross-cut) — GB-T 9286-1998
Neutral salt spray resistance: >500 h — GB-T 10125-2021
Basic Application Parameters
Coating solids content (%): >96
Volatility: Not readily volatile
Theoretical coverage (m²/kg): 10–15
Curing temperature (°C): 250
Dry film thickness (µm): 8±5
Curing time (h): 1
Working time (pot life) (h): 24
Maximum transient temperature resistance (°C): 1000
Thinner: Alkanes, esters, ethers, etc.
Recommended service temperature (°C): -30 to 700
Flash point (°C): <22 (solvent flash point)
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 with the substrate; within a certain range it can be adjusted and matched to the 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 closed and placed with care.
The storage temperature must be maintained between 5 °C and 30 °C; the shelf life is 6 months.
Opened but unused coating must be stored with the container lid tightly sealed.
Mixed coating that is not used up cannot be reclaimed and should be disposed of in accordance with local regulations.
Product beyond its shelf life may be used only after testing confirms it still meets 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 blow-off → EK-S05 treatment → Curing
Abrasive roughening. Before coating, sand or grit-blast the substrate surface to remove rust, dust, dirt and other deposits adhering to the surface to be treated. Roughening has a considerable influence on coating performance: Sa2.5 is optimal and St3 with no mill scale is the minimum (GB/T 30790.4-2014), so pay close attention to this step.
Cleaning. Remove residual oil, dust and other contamination from the roughened surface with a dedicated cleaner or degreaser.
Substrate drying. Before coating, ensure the substrate surface is dry and clean.
Coating mixing. This product is one-component; take the required quantity and filter it through a 120-mesh screen before use.
Coating application. For laboratory spray application, a spray gun with a 1.0 orifice gives better appearance and uniformity. The cured coating is somewhat hydrophobic and oleophobic, so repeated recoating is not recommended.
Curing. After spraying, allow 10 minutes for surface drying, then cure at 250 °C for 60 minutes.
Note: This product is a one-component heat-curing product; once the container is opened, use the coating within 24 hours. During longer breaks in application, clean the application tools thoroughly to prevent them from setting up. Application in a single spray pass is recommended, with a dry film thickness not exceeding 15 µm; otherwise 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.