Na2S2O5:Min 96.5%
SO2:Min 65.5%
Heavy Metals（as Pb）:Max 0.0005%
Cl:Max 1.5%
Water Insoluble:Max 0.05%
Fe:Max 0.005%
As：Max 0.0001%
Add: RM 402, 2TH UNIT,NO.40 WUJIAYUAN JIANLAN ROAD, QILIHE DISTRICT, LANZHOU, GANSU, CHINA
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