The types segment differentiates the market by crystal hydration levels, each influencing handling, solubility, and end‑use pricing. Anhydrous crystals, characterized by the absence of water molecules, command a premium due to superior stability for long‑term storage, representing approximately 40 % of type‑related revenue. Pentahydrate crystals, the most common commercial form, balance cost and performance, contributing about 45 % of sales; their moderate hygroscopicity suits bulk applications in water treatment and photographic processing. Octahydrate crystals, with higher water content, are niche products used in specialized laboratory protocols where rapid dissolution is essential, accounting for the remaining 15 % of the types market. By dissecting these sub‑categories, the market taxonomy clarifies how material specifications drive purchasing decisions and shape the overall size of the Sodium Thiosulphate Crystals market.