Product Description
STWD850 solvent-free nano-modified polyurea heavy-duty anti-corrosion coating is a combination of inorganic zirconia and modified polyurea matter with high cross-linking density. The inorganic zirconia has high hardness, high wear resistance, high toughness, high corrosion resistance and temperature resistance. This combination forms a rigid and flexible anti-corrosion coating. It can effectively prevent the penetration of corrosive media such as vapor, acid, alkali, salt, and chloride ions under hot and cold alternation, and its ultra-high wear resistance and impact resistance can also be used for the protection of some substrate surfaces.
Product features and advantages
*The coating is dense, with high hardness and good toughness, which can resist cyclic stress failure of steel structures and small cracks in concrete
*It has excellent adhesion to various metal and non-metallic materials (the surface adhesion of Sa2.5 grade steel can reach over 20MPa)
*It is can be used as primer and middle coating, and there is no need for a specialized primer to be used together. Excellent adhesion and corrosion resistance can be achieved on the surface.
*Good heat resistance and sudden temperature-changing resistance
*Excellent impact resistance, collision resistance, and wear resistance
*Excellent resistance to chemical media, such as acid, alkali, salt, etc.
*Excellent corrosion resistance, able to withstand various high concentrations of strong acids and alkalis
*Solid content above 98%, no organic VOC volatilization, environmentally friendly, odorless, and environmentally friendly
*Super strong corrosion resistance, wear resistance, and impact resistance reduce lifetime maintenance costs
*Extending the Service Life of Sprayed Structures
Product application scope
Chemical industry, oil refining, power generation, metallurgy and other industries that have high acid and alkali corrosion resistance; equipment inner wall, desulfurization tower and flue, Cesspit, container, storage tank and other fields that used under high temperature environment.
Product Physical Properties
| Item |
Part A |
Part B |
| Appearance |
Light yellow liquid |
Colod adjustable |
| specific gravity (g/m³) |
1.23 |
1.6 |
| viscosity(cps)@25ºC |
200±100 |
20000±500 |
| Solid content (%) |
98±2 |
98±2 |
| Mixing ratio(by weight) |
1 |
4 |
| Surface dry time(h) |
3-6h(25ºC) |
| Recoating time (h) |
Min 3h; max 24h(25ºC) |
| theoretical coverage (dry film thickness |
0.25kg/m2 Film thickness 150μm |
Typical physical testing performance
| Item |
Test standard |
results |
| Hardness |
GB/T22374-2008 |
50D(shore D) |
| Bending test (cylindrical axis) mm |
GB/T 6742-1986 |
1 |
| Adhesive strength (steel base), Mpa |
GB/T22374-2008 |
15 |
| Adhesive strength (concrete base), Mpa |
GB/T22374-2008 |
3.2 (or substrate broken) |
| abrasion resistance(1000g/1000r),mg |
GB/T22374-2008 |
4 |
| Heat resistance, 250ºC, 4h |
GB/T22374-2008 |
no cracks, no layering, no softening, color darken |
| Temperature resistance (240 ºC and cold water sudden change for 30 minutes for a total of 30 times) |
GB/T22374-2008 |
No cracking, no bubbles, or softening |
| Penetration resistance (Mpa) |
GB/T22374-2008 |
2.1 |
Corrosion Resistance
| Acid resistance 50%H2SO4 or20%HCl,240h |
no rust, no bubbles, no peel off |
| Alkali resistance 40%NaOH, 240h |
no rust, no bubbles, no peel off |
| Salt resistance 60g/L, 240h |
no rust, no bubbles, no peel off |
| Salt spray resistance, 2000h |
no rust, no bubbles, no peel off |
| Oil resistance, engine oil, 240h |
no bubbles, no peel off |
| 0# die sel, cru de oil, 30d |
no rust, no bubbles, no peel off |
| (For reference: pay attention to the influence of ventilation, splash and spillage. Independent immersion testing is recommended if requiring detail data.) |
Application tools and application guidance
Manual squeegee, brush, roller or spray (with 6-10% special diluent added)
Recommended dry film thickness: 250-500 μm
Re-coating interval: 6-24 hours (at 25 ºC), slightly adjusted at other temperatures
Application environment
Environment temperature: -5~+40ºC
Relative humidity: ≤80%
Dew point temperature: ≥3ºC
Application surface treatment
Metal surface: It is recommended to sandblast for rust removal, reaching Sa2.5 level according to ISO8501-1 or GB8923 standards.
Concrete surface: achieve a sturdy, dense, flat, clean, and dry state. There should be no phenomena such as sanding, peeling, cracks, honeycomb pits, etc.
The application and treatment of other material base layers can be consulted with STWD technical personnel.
Application notes
1. Before use, mix component B evenly, and then mix evenly in a weight ratio of A: B=1:4. After mixing, the operating time of the coating is related to the ambient temperature. It is recommended to use it within 30 minutes at 20 ºC.
2. When the environmental humidity is above 90%, the application is not recommended.
3. Each application interval must be within the allowable coating range. If the interval is exceeded, the previous coating must be roughened with 60 grit sandpaper.
4. After each coating application, when entering the drying room is available, the physical properties of the coating will be better after heated at 60-70 ºC.
5. The application site must be ventilated, and application personnel must take safety precautions.
Curing time
| Substrate temperature |
Surface dry time |
Foot traffic |
Solid cure |
| +10ºC |
8 |
24 |
7d |
| +20ºC |
6 |
15 |
7d |
| +30ºC |
3 |
10 |
7d |
Note: The curing time may vary depending on environmental conditions, especially changes in temperature and relative humidity.
Package and shelf life
Application specificaiton
Part A 2kg/drum, Part B 8kg/drum,
Storage temperature of environment: 5-35ºC
* shelf life: part A 10 months, part B 10 months.
* store in cool and ventilated place, avoid sunshine direct exposure, keep away from heat.
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