KF-WZ500 water-based epoxy zinc-rich primer uses a water-based epoxy resin dispersion as the binder and ultra-fine zinc powder (≥70% zinc in the dry film) as the anti-rust pigment, combined with a water-based modified amine curing agent. With water as the thinner, VOC <80 g/L, achieving >90% VOC reduction, fully complying with the GB 30981-2020 water-based industrial coatings standard and local VOC emission regulations. It solves the VOC pollution problem of conventional solvent-based epoxy zinc-rich primers while maintaining rust-prevention performance comparable to solvent-based products. Particularly suitable for steel structure anti-corrosion projects with strict environmental requirements. During application, note the sensitivity of water-based coatings to temperature and humidity (water evaporates slowly under low-temperature/high-humidity conditions).
TDS Technical Data Sheet – Waterborne Epoxy Zinc-Rich Primer KF-WZ500
Technical Data Sheet · waterborne epoxy zinc-rich primer · KF-WZ500
1. Product Description
2. Typical Applications
Urban steel box-girder bridges (VOC emission restricted zones), steel structures of stadiums and airport terminals, high-rise/super-tall building steel structures (green building certification projects), projects in industrial parks with high environmental requirements and areas adjacent to nature reserves, and confined/semi-confined space coating with strict occupational health requirements for applicators. Suitable for C3/C4 corrosive environments.
3. Technical Parameters
| Product type | Two-component solvent-based epoxy zinc-rich primer |
|---|---|
| Color | Grey (zinc grey) |
| Gloss | Matte (<10 GU) |
| Volume solids | 50±3% |
| Recommended DFT | 50-80 μm per coat |
| Theoretical spreading rate | 6.3-10 m²/L |
| Mixing ratio | A:B=10:1 (by weight) |
| Pot life | 8h(20°C)/4h(30°C) |
| Surface dry time (23°C) | ≤1h(23°C) |
| Hard dry time (23°C) | ≤24h(23°C) |
| Min. overcoat interval | 4h (23°C); no maximum limit |
| Full cure | 7 days (23°C) |
| Application temperature | 5-40°C; substrate > dew point +3°C |
| Relative humidity | <85% |
| Flash point (closed cup) | Approx. 27°C |
| Density (mixed) | Approx. 2.2 kg/L |
| VOC content | <420 g/L |
| Adhesion | Grade 0-1 / 5B |
| Packaging Specs | Component A: 20 L; Component B: 2 L |
| Shelf Life | 12 months(original sealed) |
| Salt spray resistance | ≥500 h (without topcoat) |
| Damp-heat resistance | ≥500h |
| Standard | ISO 12944-5 / SSPC Paint 20 |
| Product type | Two-component waterborne epoxy zinc-rich primer (eco-friendly low-VOC grade) |
| VOC content | <80 g/L (GB 30981-2020, waterborne) |
| Thinner | Clean tap water (dilution with organic solvents is strictly prohibited) |
4. Application Guide
Surface preparation
Thoroughly clean the substrate surface to remove oil and rust. Abrasive-blast steel to Sa2.5 (ISO 8501-1) with 40-75μm surface profile. Concrete substrate moisture content must be below 6%, grind to remove laitance. For old coatings, remove loose areas and roughen the surface.
Mixing / compounding
According to the mix ratio indicated on the product label, add the hardener (component B) slowly to the base (component A) and mechanically stir for 3-5 minutes until uniform. Let stand to mature for 10-15 minutes before use. Use up within the specified pot life after mixing.
Application method
Recommended air spray (gun orifice 1.5-2.0 mm, pressure 0.4-0.6 MPa) or airless spray (nozzle 0.38-0.53 mm, pressure 15-25 MPa). Small areas may be brushed or rolled. Keep each coat dry film thickness within the specified range.
Curing conditions
Self-cures at ambient temperature (23°C) provided relative humidity meets requirements. Do not apply under low temperature (<5°C) or high humidity (>85%). Conduct performance testing only after full cure.
5. Packaging & Storage
| Packaging Specs | Component A: 20 L; Component B: 2 L |
|---|---|
| Storage Conditions | Store at 5–35°C in a cool, dry, ventilated place away from ignition and heat sources; keep container sealed. |
| Shelf Life | 12 months(original sealed) |
| Transport | Transport as non-hazardous goods. In summer, ship in early morning or evening; avoid sun exposure. |
6. Health & Safety Notes
⚠️ Important safety notice
Read and understand the product's MSDS (Material Safety Data Sheet) carefully before using this product.
- Proper personal protective equipment (gloves, goggles, protective suit) must be worn during application
- Ensure the work area is well ventilated
- Keep away from fire and heat sources
- Avoid inhaling vapours and mist
- Avoid contact with skin and eyes
- If you feel unwell, stop work immediately and seek medical advice
Disclaimer
The data in this TDS are typical values and do not constitute product specifications. Actual product performance may vary depending on application conditions, substrate condition and environmental factors. Users are advised to conduct small-scale sample tests before bulk use to confirm product suitability.
Kexin New Materials continuously improves its products and reserves the right to modify technical parameters without prior notice. For the latest version please visit www.psste.com/water-based-epoxy-zinc-rich-primer-tds/ page.
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