Comparing two common azo orange pigments for paints, inks, and plastics.
PO5 and PO13 are both azo oranges but with distinct chemistry. PO5 is a monoazo orange-yellow; PO13 is a diarylide bright orange with higher tinctorial strength. Selection depends on shade target and budget.
| Property | PO5 | PO13 |
|---|---|---|
| Chemistry | Monoazo (Naphthol AS) | Disazo (diarylide) |
| CI Code | CI Pigment Orange 5 | CI Pigment Orange 13 |
| CAS Number | 3468-63-1 | 3520-72-7 |
| Shade | Reddish orange (orange-yellow) | Bright clean orange |
| Tinctorial strength | Standard | Higher |
| Lightfastness | 4-6 Blue Wool | 4-5 Blue Wool |
| Heat stability | 180-200°C | 180-200°C |
| Cost tier | Standard | Standard to slightly higher |
| Primary use | Indoor paints, packaging inks, textile | Inks, packaging, masterbatch (low-temp polymers) |
Choose PO5 for the more reddish-orange shade in cost-effective architectural paints, packaging inks, and textile printing. The more common azo orange for general use.
Choose PO13 when you need brighter, cleaner orange shade with higher tinctorial strength for inks and packaging. Slightly stronger color development means you can use less pigment for the same color depth.
Both have Blue Wool 4-6 lightfastness, which is adequate for indoor paints but will fade visibly within 1-2 years outdoors. For outdoor architectural orange, use PO64 (benzimidazolone, Blue Wool 7) or PO73 (DPP, Blue Wool 7-8).
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