ITEM

SPECIFICATION

Transition range of PH

1.2 (orange) - 7.6 (yellow)

6.5 (brown-yellow)-8.0 (purple)

Max absorption wavelength (nm)

λ1 (PH1.2)   503-506

λ2 (PH3.0)   430-435

λ3 (PH6.5)   430-435

λ4 (PH8.0)   557-560

The coefficient of the absorption quality, L/(ccm.g)

α1(λ1, PH1.2,dry) 110-123

α2(λ2, PH3.0,dry) 60-68

α3(λ3, PH6.5,dry) 62-67

α4(λ4, PH8.0,dry) 120-135

Alkali solution test

pass

Loss on drying

1.0% max

The residue on ignition (count by the sulphate)

0.2% max