PU421 Polyurethane Construction Machinery Topcoat is a polyurethane coating used as a topcoat. Suitable as a topcoat for various construction machinery, such as building machinery, agricultural machinery, mining machinery, bridge machinery and traffic facilities, and also as a long-life anticorrosive topcoat for outdoor steel structures under various climatic conditions. A high-performance polyurethane topcoat, two-pack, made from hydroxy acrylic resin, weatherable pigments and aliphatic isocyanate dimer. Parameters on this page: volume solids approx. 62%, dry film thickness 50–80 µm, theoretical spreading rate 10.1 m²/kg.
Source: OSAKA original technical data sheet (TDS) "PU421 Polyurethane Construction Machinery Topcoat"; spreading rate and other values are converted from TDS parameters and are for selection reference only.
The above content is compiled from the manufacturer's datasheet and this site's parameter tables. For selection, coating systems and lead times, pleaseContact Usfor confirmation.
This page carries the full TDS for this product, translated from the manufacturer's original document. No file download is needed; for an original-language copy, send an enquiry.
| Volume Solids | Approx. 62% |
|---|---|
| Dry Film Thickness | 50–80 µm |
| Theoretical Spreading Rate | 10.1 m²/kg |
| VOC | 326.8 g/L |
| Density / Specific Gravity | 1.23 kg/L |
| Number of Components | Two-component |
| Flash Point | >23 °C (components A, B and their mixture) |
| Thinner | OUP 104, recommended addition 3%–5% |
| Mixing Ratio | Component A : Component B = 6:1 (by weight) |
A high-performance polyurethane topcoat, two-pack, made from hydroxy acrylic resin, weatherable pigments and aliphatic isocyanate dimer. Attractive finish, excellent abrasion resistance, excellent UV resistance, excellent gloss and colour retention, not prone to chalking or yellowing, high hardness and strong adhesion, resistant to mild chemicals, fast curing at low temperature, in high-gloss, semi-gloss or matt.
Suitable as a topcoat for various construction machinery, such as building machinery, agricultural machinery, mining machinery, bridge machinery and traffic facilities, and also as a long-life anticorrosive topcoat for outdoor steel structures under various climatic conditions.
| Volume Solids | Approx. 62% |
|---|---|
| Dry Film Thickness | 50–80 µm |
| Theoretical Spreading Rate | 10.1 m²/kg (based on 50 µm dry film) |
| Practical Spreading Rate | Allowing a suitable loss |
| Volatile organic compound content | 326.8 g/L |
| Mixing Ratio | Component A : Component B = 6:1 (by weight) |
|---|---|
| Airless spray | Recommended: nozzle tip size 0.43–0.49 mm; fluid pressure ≥15.5 MPa |
| Brush or roller | Recommended, but use a short-nap roller or soft brush to minimise air entrapment. |
| Conventional spray | Suitable, but not recommended. |
| Air-assisted airless spray | Recommended |
| Thinner | OUP 104, recommended addition 3%–5%. |
| Paint equipment cleaner | OUP 104 |
| Pot life | 5 °C: 6 h; 23 °C: 4 h; 35 °C: 2 h |
| Drying Time | ||||
| Substrate Temperature | Touch dry (min) | Hard dry (h) | Recoat Interval | |
| Minimum | Maximum | |||
| 5°C | 45 | 24 | 24 h | 5 days |
| 23°C | 30 | 12 | 12 h | 3 days |
| 35°C | 20 | 10 | 10 h | 1 day |
| Storage | In a dry, cool environment away from fire and heat sources. |
|---|---|
| Shelf life | Component A: 1 year; Component B: 6 months |
| Packaging Specifications | Component A: 18 kg in a 20 L container; Component B: 3 kg in a 4 L container |
| Flash Point | >23 °C (components A, B and their mixture) |
| density | 1.23 kg/L |
For coating flat, primed or intermediate-coated surfaces; the surface shall be kept clean, dry and free from grease. Compatible previous coats: epoxy, polyurethane and similar primers or intermediate coats; application over unsaturated polyester filler is unhindered.
Mix in the specified ratio for immediate use, and use within the pot life. After mixing and stirring thoroughly, allow to stand for 15–30 minutes before use. Avoid contact with moisture during storage and application.
Information is subject to the manufacturer's latest version; the manufacturer's latest TDS prevails.
The technical parameters on this page are taken from the product's original manufacturer technical datasheet, the copyright of which belongs to the manufacturer. If a rights holder considers the presentation inappropriate, contact us for verification and handling.
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
Packaging specifications and batch lead times are subject to actual availability. PleaseContact Uscontact us for project-based calculation.
