Item	Index
	Superior product	First grade product	Qualified product
Appearance	Yellow	Yellow and green	Yellow and green
Phosphorus P %	27.6~28.2	27.3~28.3	26.7~28.6
Sulfur S%	71.7~72.3	71.0~72.5	70.0~73.0
Final melting pointºC ≥	276	274	273
Melting span ºC ≤	2	3	3
Iron Fe % ≤	0.004	0.01	--
Diethyl phosphorodithionic acid % ≥	85	85	85
diisobutyl dithio phosphoric acid% ≥	95	92	90
Size	Flake or Powder	Flake or Powder	Flake or Powder