Product Overview
Epoxy modification does the balancing: polysilazane brings hardness (≥5H), covalent adhesion and >200 °C service, while the epoxy function adds film flexibility and wet-adhesion insurance. Zinc phosphate and inorganic silicon fillers pack the cured film into a dense, glossy, waterproof barrier.
This is the flagship of our thin-film antirust program: boiler parts, pipes, valves and heat exchangers; railway bridges, marine engineering and oil pipelines; welds, bolts and railings — plus consumer-adjacent duty like burner caps and cookware where a hard gray-white ceramic film earns its keep.
Key Benefits
>5000 h salt spray in one coat
Heavy-duty corrosion endurance from a single 40 ± 5 µm pass — a fraction of the film build of conventional heavy-duty systems.
One-component convenience
No mixing ratio to miss: open, stir, spray, cure ambient (>24 h) or at 180 °C in half an hour.
Hard yet tough film
≥5H hardness with epoxy-modified flexibility and Grade 0 adhesion survives handling, bolting and thermal movement.
>200 °C continuous service
Keeps protecting where standard epoxy antirust paints soften and chalk, with 400 °C instantaneous capability.
Typical Applications
- Boilers, pipes & valves
- Heat exchangers
- Railway bridges
- Marine equipment
- Oil pipelines
- Steel structures, welds & bolts
- Cookware
Solution guides: Thin-Film & Chemical-Resistant Anti-Corrosion
Technical Data
| Test Item | Performance Indicator | Test Method |
|---|---|---|
| Appearance | Gray-white | Visual |
| Solid Content | 65–80% | GB/T 1725-2007 |
| Density | 1.5–1.7 g/cm³ | Measured |
| Pencil Hardness | ≥5H | GB/T 6739-2006 |
| Adhesion | Grade 0 | GB/T 9286-1998 |
| Neutral Salt Spray Resistance | >5000 h: no blistering or rust | GB/T 1771-2007 |
| Mixed Viscosity | 21–30 s | GB/T 26490-2011 |
| Artificial Aging Resistance | 3 d: no rust, powdering or cracking, slight discoloration | GB/T 1865-2009 |
| Theoretical Coverage | 6–10 m²/kg |
| Dry Film Thickness | 40 ± 5 µm |
| Room-Temperature Cure | >24 h |
| Heat Cure Option | 180 °C / <0.5 h |
| Pot Life | 6 h |
| Service Temperature | >200 °C continuous (400 °C instantaneous) |
Values from the SILZ-RT61 technical data sheet. Complete TDS with test conditions available on request.
Curing & Processing Guidance
Surface preparation: Sa 2.5 target (minimum St 3, no mill scale), degreased and dry. Stir to uniformity; mixed viscosity runs 21–30 s.
Spray one pass at 40 ± 5 µm dry film; coverage runs 6–10 m²/kg. Pot life after opening is 6 hours.
Ambient cure exceeds 24 hours to full properties; 180 °C shortens it to under 30 minutes. For field structures, plan weather windows as with any ambient-cure coating — humidity accelerates, cold slows.
Substrate Compatibility
Carbon steel first — bridges, pipelines, structural steel, welds and fasteners — plus cast iron, stainless and aluminum after standard preparation. For galvanized or previously coated surfaces, run an adhesion patch test; protocols ship with the TDS.
SILZ-RT61 — Purchasing & Application FAQ
Is 40 µm really enough for heavy-duty environments?
The >5000 h neutral salt spray result is measured at the specified 40 ± 5 µm film. Dense filler packing plus covalent bonding deliver barrier performance conventional systems reach only with hundreds of microns — that thin-film economics is the product's reason to exist.
RT61 or EPPSZ-2K — how do I choose?
Both are epoxy-modified with 5000 h-class salt spray. RT61 is one-component: simplest logistics and application. EPPSZ-2K is two-component (A:B = 1:1) with a verified 300 °C thermal-shock result — choose it where cure control and thermal cycling dominate; choose RT61 for field simplicity.
Can it be used on items that contact food, like cookware exteriors?
It serves exterior duty on small appliances and cookware components (burner caps, rice-cooker parts). Direct food-contact surfaces need application-specific compliance review — ask us with your regulatory market.
TDS / SDS / COA & Samples
Technical Data Sheet, Safety Data Sheet and batch Certificate of Analysis are available for SILZ-RT61, and a COA accompanies every shipment. Evaluation samples ship with starting-parameter guidance.
Packaging: Available in 1 kg, 2 kg, 5 kg and 25 kg pails. Use within the 6-hour pot life after opening.
SDS & batch COA on request · Reply within 1 business day.