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HP RED 25114 / PIGMENT RED 81

Pigment Red 81 for solvent based inks

P.R.81 affords a very clean bluish red shade, which matches the purple-red on the DIN 16 508 color scale for letterpress application and also on the DIN 16 509 offset scale. The shade is not accessible by using other pigments (Sec. 1.8.1.1). Pigments which are closely related by shade, such as P.R.147, provide shades which are not even remotely as clean. The standard magenta on the European Color Scale for letterpress (DIN 16 538) and offset printing (DIN 16 539) is somewhat yellower. For such printing inks, certain high solvent fastness properties are required in order to safely overlacquer the prints.

P.R.81 is a strong pigment, which, as with other representatives, is especially true for the PTM types. The pigment commonly darkens noticeably as it is exposed to light.

Quantity:

HP RED   25114

C.I.PR81
Chemical   Composition:                    
Color   Index: Pigment   Red 81
C.I.NO.: 45160
Chemical Formula:          C28H31N2O3      
CAS NO.:                   12224-98-5
EU NO.:                    235-424-7
Physical Properties:                       
Physical   Form :             Red   Powder              
Heat Resistance(º C):           150
Density (g/cm3):       1.8
Specific Surface(/g): 35
PH Value:                  6.5-7.5
Oil Absorption(ml/100g):      50
Fastness   Properties:                       Full Color Tint Color
Dispersibility:              Excellent                     Excellent                    
Light Fastness:             5 4
Acid Resistance:            4 4
Alkali Resistance:           3 4
Weather Fastness:        4 3
Water Resistance: 4 4
Oil Resistance: 4 3
Recommended   Applications: Solvent Base Ink

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