Key Features

High‑strength bleaching powder refers to a concentrated form of calcium hypochlorite, also known as high‑efficiency bleaching powder or higghtest bleaching powder, with high available chlorine content for strong oxidizing and disinfectant performance. Its main component is calcium hypochlorite (Ca(ClO)₂), which releases hypochlorous acid when dissolved in water, providing powerful oxidation that kills bacteria, viruses, fungi, and other harmful microorganisms. This makes it ideal for demanding bleaching, disinfection, and sanitation applications in industrial, municipal, and household contexts.

Chemical Composition & Properties

High‑strength bleaching powder is typically a white to off‑white granular or powder chemical mainly composed of calcium hypochlorite with reduced levels of impurities such as calcium chloride and calcium hydroxide. It is a strong oxidizing agent that breaks down in water to form hypochlorous acid, an active disinfectant species. Compared with ordinary bleaching powder, high‑strength versions have higher available chlorine content (often ≥55% and up to about 70%) and stronger disinfecting and bleaching ability.

Product Description

High‑strength bleaching powder is designed to supply high available chlorine to water or surfaces that require rigorous sanitation or bleaching treatment. When added to water, it quickly dissociates and generates hypochlorous acid, which penetrates microbial cell walls and oxidizes essential cellular components, leading to effective microbial inactivation. This broad‑spectrum action also oxidizes stains or pigments on materials such as textiles or paper pulp, making it suitable for bleaching in industrial processes.

Applications in Water Treatment & Sanitation

High‑strength bleaching powder is widely used in drinking water disinfection, where it ensures potable water safety by eliminating pathogens. It is also essential in swimming pool sanitation and wastewater treatment, efficiently controlling algae, bacteria, and organic contamination. Beyond water systems, it is used in industrial bleaching for textiles and paper, surface disinfection in healthcare and food facilities, and general hygiene applications in public spaces and household environments.

Mechanism of Action

The disinfecting and bleaching mechanism of high‑strength bleaching powder is based on the formation of hypochlorous acid (HOCl) when it dissolves in water. Hypochlorous acid is a highly reactive oxidizing agent that disrupts microbial cell membranes, denatures proteins, and interferes with metabolic processes, leading to the rapid inactivation of bacteria, viruses, and fungi. Its strong oxidative effects also chemically break down pigments and stains in bleaching applications.

Usage & Dosing Guidelines

Proper use of high‑strength bleaching powder depends on the intended application and treatment volume. For water sanitation, dosing is adjusted to achieve recommended free chlorine levels—typically measured in parts per million (ppm)—ensuring effective disinfection while avoiding over‑chlorination. In industrial bleaching, the powder is applied at concentrations appropriate for material type and desired bleaching effect. Always pre‑dissolve in water and ensure thorough mixing to achieve even distribution and optimal effectiveness.

Benefits

High‑strength bleaching powder offers several advantages: rapid and broad‑spectrum disinfection, strong oxidation capable of breaking down organic contaminants, and effective bleaching action for textiles and paper. Its high available chlorine content means smaller dosages can achieve significant results compared with lower‑strength alternatives, making it cost‑effective for large‑scale sanitation and industrial use. Under proper storage conditions, it also provides long‑term stability and reliability.

Safety Considerations

Handling high‑strength bleaching powder requires appropriate personal protective equipment (PPE) such as gloves, eye protection, and masks to prevent irritation or chemical exposure. It should never be mixed with acids or incompatible chemicals, as this can release toxic gases like chlorine. Ensure good ventilation when working with the product, and follow safety guidelines and material safety data sheets to minimize hazards and ensure safe application.

Storage Instructions

Store high‑strength bleaching powder in a cool, dry, and well‑ventilated area away from direct heat, moisture, and sunlight to preserve its available chlorine content and avoid degradation. Keep the product tightly sealed in its original packaging and separated from organic, combustible materials, acids, and reducing agents to prevent hazardous reactions. Regular inspection of storage conditions and packaging helps maintain long‑term product effectiveness and safety until use.