Characteristics                       White, crystalline powder or silky, white or almost white, crystals
Melting Point                          234.0-239.0°C  (BP/EP)
Infrared Absorption                  Conforms to the caffeine Reference Spectrum (BP/EP)
Appearance of solution            Clear,colourless  (BP/EP)
Heavy metals                         ≤0.001% (USP)
Sulphate                                ≤500ppm (BP/EP)
Each impurity A,B,C,D,E,F        ≤0.10% (BP/EP)
Unspecified impurities             ≤0.10% (BP/EP)
Total impurities                       ≤0.10% (BP/EP)
Any individual impurity             ≤0.10% (USP)
Total impurities                       ≤0.10% (USP)
Loss on drying                        ≤0.50% (BP/EP)
Residue on ignition                  ≤0.10% (USP)
Assay                                    98.5-101.0%(USP)