Product Overview
The formulation is an organic-inorganic hybrid: polysilazane binder with copper-chromium black pigment, phosphates and inorganic silicon fillers. Cured, the fillers pack tightly in the resin matrix for a compact, moderately glossy film that bonds covalently to steel — heat resistance above 600 °C with 800 °C instantaneous capability, plus acid, salt-spray and aging resistance.
It anchors App-class duty on desulfurization units, petrochemical cracking equipment, exhaust systems and high-temperature steel structures across power, metallurgy and aerospace maintenance programs — anywhere the asset cannot come offline for a bake.
Key Benefits
600 °C service from ambient cure
Full ceramic-class heat resistance without oven curing — the defining trade of this grade.
800 °C instantaneous capability
Survives short thermal spikes and flue-gas excursions beyond its continuous rating.
Thin 30 µm system
One thin coat at 30 ± 5 µm protects with 10–15 m²/kg coverage — low added weight on large structures.
30-day salt spray, phosphate-inhibited
Anti-corrosion fillers and dense packing deliver >30 d neutral salt spray endurance on hot-section steel.
Typical Applications
- Chimneys & flues
- Heat exchangers
- Furnaces
- Desulfurization units
- Petrochemical cracking units
- Exhaust systems
Solution guides: High-Temperature Corrosion Protection
Technical Data
| Test Item | Performance Indicator | Test Method |
|---|---|---|
| Appearance | Black | Visual |
| Solid Content | 70–85% | GB/T 1725-2007 |
| Density | 1.63–1.72 g/cm³ | Measured |
| Pencil Hardness | ≥5H | GB/T 6739-2006 |
| Adhesion | Grade 0 | GB/T 9286-1998 |
| Neutral Salt Spray Resistance | >30 d: no blistering, cracking or rust | GB/T 1771-2007 |
| Viscosity | 21–26 s | GB/T 26490-2011 |
| Artificial Aging Resistance | 3 d: no rusting, chalking or cracking | GB/T 1865-2009 |
| Theoretical Coverage | 10–15 m²/kg |
| Dry Film Thickness | 30 ± 5 µm |
| Room-Temperature Cure | >24 h |
| Heat Cure Option | 180 °C / <0.5 h |
| Pot Life | 6 h |
| Recommended Service Temperature | -30 to 600 °C (800 °C instantaneous) |
| Diluent | Aromatics, esters, ethers |
Values from the SILZ-RT31 technical data sheet. Complete TDS with test conditions available on request.
Curing & Processing Guidance
Prepare steel to Sa 2.5 (minimum St 3, no mill scale), degrease, dry. Stir the one-component material to full uniformity and filter before spraying.
Apply one coat at 30 ± 5 µm dry film. Pot life after opening is 6 hours.
Cure at room temperature for >24 hours, or 180 °C for under 30 minutes when a heat source exists. First heat-up of in-service equipment completes densification — commissioning guidance for ramp rates ships with the TDS.
Substrate Compatibility
Carbon steel, alloy steels and stainless equipment surfaces in high-temperature corrosive service — chimneys, flues, heat exchangers, furnace shells, desulfurization and exhaust systems. Confirm substrate alloy and peak temperature so we match the formulation.
SILZ-RT31 — Purchasing & Application FAQ
Can SILZ-RT31 be applied to equipment that cannot be taken out of service long?
Yes — that is its role. Ambient cure needs only >24 hours before handling, and in-service heat completes densification. For turnaround windows, the 180 °C / 30-minute schedule cures it before re-commissioning.
How does RT31 differ from the SILZ-HT oven-cured line?
RT31 trades a little top-end capability for ambient cure: 600 °C continuous / 800 °C instantaneous versus HT-grade ceilings of 800 °C+ with oven or nitrogen cures. If you can bake, look at HT21/HT23/HT52/HT53; if you cannot, RT31 is the answer.
Is the black color fixed?
Yes — the copper-chromium black pigment is part of the heat-resistance package. Where color matters more than the last degrees of temperature rating, see the gray RT61/EPPSZ-2K systems or ask about project-specific builds.
TDS / SDS / COA & Samples
Technical Data Sheet, Safety Data Sheet and batch Certificate of Analysis are available for SILZ-RT31, 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. Reseal promptly; use opened material within the 6-hour pot life.
SDS & batch COA on request · Reply within 1 business day.