Comparing two popular naphthol red pigments for paints, inks, and rubber compounding.
PR112 and PR170 are both naphthol AS reds widely used in architectural paints, printing inks, and rubber. PR170 (Fast Red F3RK) is a premium grade with better lightfastness; PR112 is the cost-effective workhorse.
Choose PR112 for cost-effective standard reds in architectural paints, packaging inks, textile printing, and rubber compounding where Blue Wool 5-6 is acceptable. The workhorse warm red.
Choose PR170 (Fast Red F3RK) for premium architectural paint, cost-conscious automotive refinish, and applications needing the cleaner bluer-red shade. Lightfastness 6-7 Blue Wool is meaningfully better than PR112 for outdoor applications.
PR170 works for cost-conscious automotive refinish but is below the OEM standard (Blue Wool 8). For premium automotive coatings, use quinacridone reds (PR122, PR202) or DPP reds (PR254). PR170 is acceptable for general industrial coatings and architectural paint.
PR112 has heat stability 180-200°C — adequate for PVC pipe (180-200°C processing) but insufficient for HDPE/PP at 240-280°C. For plastic masterbatch in HDPE/PP, choose PR170 (220°C heat stable) or premium grades like PR122 quinacridone (300°C+).
Share your binder system, processing temperature, and required performance — we'll recommend the right grade and ship a free 50-100g sample for qualification.