KF-RC100 direct-to-rust primer (also called rust-conversion primer / anti-corrosion primer for rusty steel) uses a special chelation-conversion mechanism to chemically convert the rust on the steel surface (Fe2O3·nH2O) into a stable iron-tannate / iron-phosphate chelate protective layer. It can be applied directly onto surfaces hand-cleaned to St2-St3 grade (ISO 8501-1), greatly reducing sand-blasting de-rusting cost and solving the problem that many on-site maintenance projects cannot carry out sand-blasting. Suitable for the maintenance and renovation of aging steel structures. Not suitable for severe laminar rust or mill scale (which must be removed first).
TDS Technical Data Sheet – Rust-Resistant Coating Primer KF-RC100
Technical Data Sheet · Direct-to-rust primer · KF-RC100
1. Product Description
2. Typical Applications
On-site maintenance and renovation of aging steel structures, pipelines and storage tanks (where sand-blasting is not feasible); coating after hand de-rusting of elevated structures such as towers, bridges and trestles; maintenance of fire-protection piping, HVAC ducting and pipe-rack supports; direct coating of lightly rusted steel (skipping the de-rusting step); used in combination with various topcoats (epoxy / PU / alkyd).
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 | One-component rust-converting primer applied over rust (chemical conversion mechanism) |
| Applicable de-rusting grade | Hand / power-tool de-rusting to St2-St3 (ISO 8501-1) |
| Color | Iron red / dark brown |
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/rust-converter-primer-tds/ page.
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