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Chlorine

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7 articles

Water & EnvironmentalSep 25, 2026 16 min

The Gas Mask Made of Photo Fixer: How Sodium Thiosulfate Met Chlorine in 1915

The Hypo helmet was the first gas mask issued in bulk to British and Canadian troops in the First World War. It was a flannel hood soaked in a solution of sodium...

Water & EnvironmentalAug 14, 2026 16 min

Who Discovered Chlorine? The 1774 Green Gas That Became Sodium Hypochlorite

Sodium hypochlorite is the sodium salt of hypochlorous acid, with the chemical formula NaOCl and CAS number 7681-52-9. It was first produced in 1820 by Antoine Germain Labarraque, who dissolved chlorine in...

Chemical & Product GuidesAug 6, 2026 6 min

What Bleach Actually Is: Sodium Hypochlorite From 1% to 12.5%

Bleach is a water solution of sodium hypochlorite (NaOCl), typically at 5–6% concentration for household use, with the remainder being water and a small amount of sodium hydroxide to stabilize pH. Sodium...

Water & EnvironmentalJun 18, 2026 18 min

Sodium Hypochlorite for Cooling Towers & AI Data Centers: Dosing, Cost & Treatment Guide

Sodium hypochlorite (NaOCl, CAS 7681-52-9) — liquid chlorine bleach — is the workhorse oxidizing biocide for recirculating cooling-tower water. Dosed to an ORP/free-chlorine setpoint (commonly ~0.5 ppm free chlorine continuous, with periodic shock...

Water & EnvironmentalAug 26, 2025 22 min

An Engineer's Guide to Sodium Bisulfite for Dechlorination

Residual chlorine from pre-oxidation is a silent killer of expensive ion exchange resins, causing premature failure and crippling treatment efficiency. For engineers and operators of arsenic removal and other high-purity water systems,...

Safety & HandlingFeb 1, 2024 16 min

Sodium Hypochlorite 12.5%: How It Works on Mould and Algae Staining

Sodium hypochlorite 12.5% is an industrial-strength aqueous solution of the chemical with CAS Number 7681-52-9 and a molecular weight of 74.44, appearing as a pale yellow liquid. It is highly water soluble...

Industrial ApplicationsJul 30, 2023 8 min

The Top Applications of Sodium Hypochlorite 12.5% in Everyday Industries

Sodium hypochlorite 12.5% is a pale yellow liquid chemical (formula NaOCl, CAS 7681-52-9, molecular weight 74.44 g/mol) used in industrial and commercial applications such as municipal water treatment, commercial pool maintenance and...

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