As a coatings formulator or technical buyer, selecting between Pigment Red 170 and Pigment Red 122 requires precise data. This 2026 benchmark provides:
Based on Honor Pigments’ 15+ years supplying automotive OEMs worldwide.
Before selecting a red pigment for automotive applications, verify these 2026-standard parameters:
| パラメータ | PR170 (HP Red 2131) | PR122 (HP Red 3120) | Test Method | Industry Standard |
|---|---|---|---|---|
| Chemical Identity | Naphthol AS (C.I. 12475) | Quinacridone (C.I. 73915) | HPLC/FTIR | ISO 18473-3:2026 |
| Weathering ΔE (3yr Florida) | ≤1.5 | ≤2.0 | Natural exposure | ISO 2810:2025 |
| QUV Aging (2000h) | ΔE ≤ 2.0 | ΔE ≤ 2.5 | QUV-B 313nm | ISO 16474-2:2026 |
| Heat Stability | 280°C | 260°C | TGA analysis | ISO 11358-1:2026 |
| Chemical Resistance (Gasoline 24h) | No effect | Slight discoloration | Immersion test | ASTM D1308-2026 |
| Hiding Power Index | 98% | 95% | Contrast ratio | ISO 6504-3:2025 |
| Dispersibility (Hegman) | 7.5+ | 7.0+ | Grind gauge | ASTM D1210-2026 |
| pH Value (10% slurry) | 6.5-7.5 | 6.0-7.0 | pH meter | ISO 787-9:2025 |
| Particle Size D50 | 0.15-0.25 μm | 0.10-0.20 μm | Laser diffraction | ISO 13320:2026 |
Table 1: 2026 TDS-level comparison. All data verified against latest industry standards.
Typical cost premium: 15-20% over PR122
Cost-effective alternative with 85-90% of PR170 performance
OEMs now require ΔE < 1.5 (3yr Florida) for exterior parts
New restrictions on certain intermediates used in pigment production
PR170 supply stable; PR122 facing 5-8% price increase due to raw material costs
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Get our 2026 Automotive Coatings Comparison Kit including:
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Explore more automotive coatings resources:
Complete guide to qualifying PR170 for coatings, plastics, and printing inks
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