Pigments & Colorants
REACH
Indanthrone Blue
CAS Number
81-77-6
EC Number
201-375-5
E Number
E128
What is Indanthrone Blue?
Indanthrone Blue (CAS 81-77-6), also known as C.I. Pigment Blue 60 or Indanthrene, is a high-performance vat-derived organic pigment; a deep, reddish-blue hue with outstanding lightfastness.
Where is Indanthrone Blue used?
- Industrial and architectural coatings: durable blue shades that resist fading in exterior environments
- Plastics: polyolefins, engineering resins, masterbatches
- Textile dyeing: vat pigment for wash-fast, lightfast blue shades on cotton and cellulosic fibers
- Printing inks: packaging applications requiring migration-resistant color across long press runs
- It is used where long-term color stability under UV exposure and heat is a primary selection criterion.
Commercial specifications
- Standard grades meet C.I. Pigment Blue 60 specifications
- Surface-treated variants for optimized dispersion in specific resin systems
- Crude and conditioned grades; particle size and surface chemistry matched to coating, plastic, or ink requirements
Other Names (Synonyms)
Indanthrene|C.i. pigment blue 60|Pigment blue 60|2,17-diazaheptacyclo[16.12.0.03,16.04,13.06,11.019,28.021,26]triaconta-1(18),3(16),4(13),6,8,10,14,19(28),21,23,25,29-dodecaene-5,12,20,27-tetrone|Indanthrone
What are the physical properties of Indanthrone Blue?
Melting Point 485 °C (decomp)
Boiling Point 553.06°C (rough estimate)
Density 1.3228 (rough estimate)
Appearance blue needles with a metallic lustre
Color Dark red to Dark purple to Dark blue
Form powder to crystal
Water Solubility <0.1 g/100 mL at 21 ºC
Refractive Index 1.5800 (estimate)
Log P 1.78 at 20℃
Which trade and regulatory codes apply to Indanthrone Blue?
HS Code 3204.15.8000