Polyurethane Primer for Construction Machinery
1 PRODUCT DESCRIPTION
A two-component product cured by aliphatic isocyanate, comprising dedicated hydroxyl resin, pigments and fillers, additives and solvents.
2 RECOMMENDED USE
This primer is designed for critical components of construction machinery, including frames, cabs and working attachments. It forms a protective barrier that blocks moisture and oxygen, improves coating-system adhesion and weather resistance, provides a sound base for subsequent topcoats and extends machinery service life under complex operating conditions.
3 FEATURES
- Outstanding weather resistance and gloss retention.
- Rapid film drying.
- Outstanding impact and abrasion resistance.
4 COMPLIED STANDARDS
Complies with HG/T 2454-2014, Solvent-based Polyurethane Coatings (Two-component).
5 PHYSICAL PROPERTIES
| Color | Various colors |
| Gloss | 35 GU at 60° |
| Mixing Ratio | Base/Hardener = 18/3 by weight |
| Specific Gravity | 1.42 ± 0.10 g/cm³ |
| Volume Solids | 52.3 ± 2% |
| Weight Solids | 67.5 ± 2% |
| Film Thickness | Dry: 30–50 microns/coat; Wet: 57–96 microns/coat |
| Theoretical Coverage | 0.109 kg/m² at 40 microns |
Practical coverage varies with surface condition, environment and application method.
6 APPLICATION
Application Temperature: 5–40°C
Application Conditions: Relative humidity below 85%. Substrate temperature at least 3°C above the dew point.
Pot Life
| Temperature | 5°C | 10°C | 20°C | 30°C |
| Pot Life | 10 h | 8 h | 5 h | 3 h |
Application Methods: Airless spray, air spray, brush and roller.
| Method | Nozzle | Pressure | Thinning Ratio |
| Airless Spray | 0.33–0.43 mm | ≥10 MPa | 10–20% by weight |
| Air Spray | 1.5–2.0 mm | 0.3–0.4 MPa | 10–20% by weight |
| Brush/Roller | — | — | 5–10% by volume |
Thinner: Polyurethane diluent.
Drying Time and Overcoating Interval
| Temperature | 5°C | 20°C | 30°C |
| Dry to Touch | 1 h | 0.5 h | 20 min |
| Dry Hard | 6 h | 3 h | 2 h |
| Minimum Interval | 12 h | 6 h | 4 h |
| Maximum Interval | — | — | — |
Applied Substrate: Bare steel.
Coating System: Acrylic polyurethane topcoat or the PUNTIUM recommended coating system.
7 SURFACE PREPARATION
- Remove salts and water-soluble contaminants with fresh water.
- Remove oil and grease using suitable detergent or solvent in accordance with SSPC-SP 1.
- Abrasive blast to ISO Sa 2½ / SSPC-SP 10 or better.
- Surfaces must be clean, dry and dust-free.
8 STORAGE
Store in dry, cool conditions away from heat and ignition. Keep containers tightly closed.
Shelf Life: 18 months at 25°C, subject to re-inspection thereafter.
9 CAUTIONS
SAFETY PRECAUTIONS
- Avoid skin and eye contact.
- Wash skin with warm water and/or suitable cleanser. Flush eyes with plenty of water and seek immediate medical attention.
- Ensure good ventilation and avoid inhalation of spray mist or vapour.
- Comply with relevant national regulations and consult the SDS.
DISCLAIMER
The information provided is the most comprehensive and accurate data currently available. Operating conditions are beyond our control; therefore, it does not constitute a warranty and is intended to assist product selection. Confirm that the latest TDS is used before application.
PREPARATION DATE: 2024-02-09
REVISION DATE: 2026-02-04
