High Purity 99% Sodium Thiosulfate Pentahydrate for Photographic Fixer and Cyanide Antidote Applications

Sodium thiosulfate pentahydrate (Na₂S₂O₃·5H₂O), traditionally known in many industries as "Da sūdǎ" or "hypo," is a versatile inorganic compound with critical roles in both technical and medical fields. Our premium-grade product, certified at 99% purity, is specifically refined to serve as an essential Photographic Fixer in traditional and specialized imaging processes and as a reliable Cyanide Antidote in emergency medical and industrial safety applications.

In photographic processing, sodium thiosulfate's primary function as a Photographic Fixer is to dissolve unexposed and undeveloped silver halide crystals from photographic films, plates, and papers, thereby stabilizing the image and preventing further darkening upon exposure to light.

Our 99% purity grade ensures rapid and complete fixation without leaving stains, sludge, or insoluble residues that could damage delicate emulsions or reduce image archival quality.

In medical and emergency response contexts, sodium thiosulfate serves as a vital Cyanide Antidote, officially recognized in cyanide poisoning treatment protocols worldwide.

The 99% pharmaceutical-grade purity is non-negotiable, as impurities could cause adverse reactions or reduce therapeutic efficacy.

Sodium thiosulfate pentahydrate also finds significant use in:

• Water treatment for dechlorination
• Analytical chemistry as a titrant in iodometric titrations
• Leather tanning to remove residual chlorine
• Mining for gold extraction via the thiosulfate process