Item
Unit
Index
Purity (base on C4H4O4)
%
99.50~100.50 (干基)
Heavy metal (base on Pb)
PPM
≤ 10
Arsenic (base on As)
≤ 3
Water content
≤ 0.5
Melting range
oC
286~302
Residue on ignition
≤ 0.1
Chroma (in 5% ethanol)
#
≤ 15
Maleic acid