Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Stannous sulfate turns brown in storage
Q. I am trying to make stannous sulfate powder. I have already made it but when I store stannous sulfate powder, after 1-2 months it turns brownish-yellow.
I was reading on internet and somewhere it was mentioned that powder has to final washed with methanol. Please guide me how this is done and can I add methanol in basket centrifuge or outside and how much quantity should be used for 1 kg stannous sulfate powder.
- Surat Gujarat
April 21, 2024
A. Stannous sulphate is easily oxidised by air causing the yellowish colour. Keep well sealed with minimum air exposure.
Geoffrey Whitelaw
retired 85+ metal finishing chemist - Port Melbourne, Australia
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