how strong of bleach to disinfect clean room

Cleaning and disinfection of the clean room is a key link to ensure air quality and product quality. bleach (such as bleaching powder) is a common disinfectant and is widely used in clean room disinfection. Its active ingredients can kill bacteria, viruses and fungi, helping to maintain the modular clean room environment. However, the intensity of bleach use is closely related to factors such as disinfection effect and material tolerance, and excessive use may cause harm to equipment or personnel. This article will analyze how to use bleach reasonably for clean room disinfection and provide guidance on relevant standards and specifications.

1. Basic properties and functions of bleach

Bleaching powder is a chemical preparation with strong disinfection function, and its main components are calcium chloride and calcium hydroxide. Bleaching powder decomposes in water to produce chlorine and hydroxide, has a broad-spectrum bactericidal effect, and can effectively kill bacteria, viruses, fungi and other microorganisms.

Bleaching powder has a strong disinfection effect, but it needs to be used under the premise of strictly controlling the concentration and frequency of use to avoid unnecessary corrosion and Environmental pollution.

2. The effect of bleaching powder concentration on disinfection effect

The concentration of bleaching powder directly determines its disinfection effect. In the disinfection process of the clean room, too high or too low bleaching powder concentration may lead to unsatisfactory effect. Generally speaking, the concentration of bleaching powder should be reasonably adjusted according to the area of the clean room, the degree of pollution and the tolerance of the equipment.

• Common concentration range

  When cleaning the surface, the concentration of bleaching powder solution is usually 1%-5% (that is, 10-50 grams of bleaching powder is added per liter of water).

•  Disinfection effect

  Too high a concentration of bleach may cause corrosion of floors, walls and equipment, while too low a concentration may not achieve the ideal disinfection effect.

According to the specific needs of the clean room, it is recommended to choose an appropriate concentration for disinfection, and pay attention to the solubility and contact time of bleaching powder.

3. Frequency of use and precautions of bleaching powder

In the clean room, bleaching powder should not be used too frequently to avoid affecting the air quality, equipment surface and staff health. Reasonable frequency of use can not only ensure the disinfection effect, but also minimize the possible side effects of bleaching powder.

• Frequency of use

  It is generally recommended to thoroughly disinfect once a month, and adjust according to the degree of pollution if necessary.

• Precautions

  When using bleaching powder, good ventilation should be maintained to avoid harm to the human body caused by bleaching gas.

At the same time, appropriate protective equipment, such as gloves, masks, etc., should be worn during operation to prevent chemical substances from irritating the skin and respiratory tract.

4. Application of bleaching powder in different disinfection scenarios

Bleaching powder has a wide range of applications, but the disinfection requirements and methods in different scenarios are different. In the disinfection of clean rooms, the main application of bleaching powder is to clean fixed facilities such as floors, walls, and equipment surfaces, while air disinfection requires the use of more professional equipment and disinfectants.

• Surface disinfection

  Use 1%-2% bleaching powder solution to wipe the walls and floors once a month.

• Air disinfection

  Avoid using bleaching powder directly for air disinfection. Disinfection can be carried out through an air purifier combined with the gasification of bleaching powder solution.

For equipment and precision instruments in clean rooms, direct contact with bleaching powder should be avoided to avoid corrosion or damage.

5. Evaluation and standards of disinfection effect of bleaching powder

In order to ensure the reliability of the disinfection effect of bleaching powder, the cleanliness of the environment after disinfection must be evaluated regularly. Air quality monitoring, surface microbial detection and other methods can be used to confirm whether the disinfection effect meets the requirements.

According to international standards, modular clean rooms should reach a certain cleanliness level to ensure that the production environment meets the requirements.

List of relevant standards and specifications

• ISO 14644-1: Air cleanliness level standard for clean rooms and related controlled environments

• EN 1822: European hepa filter certification standard, involving air purification and disinfection effects

• ISO 13485: Requirements for clean rooms in medical device production environments

• ASHRAE 170: US clean room air quality and ventilation standards

• OSHA standards: US Occupational Safety and Health Administration safety standards for chemical use

The use of bleach as a disinfectant in A Clean Room must strictly follow reasonable concentrations and frequencies of use to avoid unnecessary impacts on equipment and the environment. Regular effect evaluation and standardized operations can ensure clean room air quality and product safety.