... petrochemicals, pesticides, pharmaceuticals, dyes, leather, painting, organic synthesis, etc. Item: Index Appearance: Clear without Suspension Dimethyl Formamide ( DMF ) % ≥99.9 Color ... ≤200 PH ( 25º C, 20% solution ):6.5-8.0 Refractive Index No. 25 :1.4275-1.4290 Conductivity ( 25º C, 20 ...