In a clean room, people are an important factor in determining the generation of particulate pollutants. Each member of the cleanroom team should fully understand the impact of personal hygiene habits on the cleanliness level of the cleanroom, which is the most important thing. Following the following principles can prevent the generation of anthropogenic particulate pollutants in clean room environments.

1. Personal hygiene

Maintaining personal hygiene is very important. As soon as you enter the clean room, you should always pay attention to your behavior and avoid bringing unnecessary pollutants and bad habits from daily life into the clean room. When your work needs to be done in a clean room or even just walk into a clean room, you must get used to wearing cotton or polyester blend casual clothes that won't shed hair. Try not to wear clothes made of nylon or other synthetic fiber fabrics, as they are prone to static electricity and can absorb particles due to static electricity. Also, do not wear sweaters, scarves, or socks with fuzz.

Regularly take a shower and wash your hair every day, which can effectively control dandruff and dandruff. Try to cut your nails as short as possible. If you have to apply nail polish, you can only use nail polish that will not fall off, contains no metal and does not have flash. Do not leave long nails as they may puncture gloves or finger cots. Before entering the cleanroom, wash your hands with specially formulated cleanroom cleaners and moisturizers to remove dead cells and prevent skin from shedding. To achieve this goal, you can only wash your hands with the soap and moisturizer provided by your employer. The detergents that are sold directly and can be purchased in stores contain sodium and oil, which do not meet the requirements of cleanrooms. Do not scratch or rub your skin in the clean room, as such actions may cause skin to peel off and contaminate the product.

Before entering the cleanroom, comb your hair regularly to remove dandruff and hair loss. Wear a fluffy hat and stuff the hair on your forehead into it. Everyone has to do this. Do not take off your hat in the clean room or changing room, and do not comb or brush your hair in the clean room or changing room.

Chewing oral candies and sucking mint candies are not allowed in the clean room. However, drinking a certain amount of water before entering the clean room can effectively maintain the moisture in the body. A fountain can be installed outside the clean room. Do not bring food and drinks into the clean room. Smoking is not allowed within fifteen minutes before entering the clean room to maintain lung cleanliness.

As for clothing and personal items, as for jewelry, staff can wear wedding and engagement rings, but do not wear rings with sharp corners or edges, as they may pierce gloves or clothing. If you must wear these rings, you need to wrap them with straps before wearing gloves and clean clothes. It is recommended not to wear dangling earrings, necklaces, brooches, and other protruding or hanging accessories, even if they are usually hidden inside clothing. Because these things may interfere with normal activities in cleanrooms or laboratories. Personal items such as cigarettes, wallets, tissues, and paper products should be stored in desks or lockers and should not be brought into cleanrooms. Unless granted special permission by the management, clothing pockets can only be empty in the clean room. It is strongly recommended that staff wear glasses or goggles, as we release mucus from our eyes every time we blink. Before entering the clean room, first wipe off all visible particulate pollutants from the glasses and goggles.

Dry dandruff, exhaled air, and saliva can all contaminate the product. The face masks used by each company are different, but people with sideburns, small beards, or long beards must wear beard covers. Disposable shoe covers should be replaced once or twice a day. Most changing rooms have a clean side and a contaminated side, and cleanroom personnel should always follow the regulations. You cannot walk out of the changing room wearing shoe covers and walk in wearing the same pair of shoe covers.

Wear a fluffy round hat. As mentioned earlier, hair, including bangs, must be hidden in a hat and cannot be exposed. Hats can only be removed outside the clean room or changing room, and cannot be removed inside the clean room. Hats worn outside the clean room or changing room cannot be reused.

If using washable work clothes or jumpsuit work clothes, it is recommended to change them once or twice a week, or immediately change them as soon as the clothes get dirty.

Always follow the dress code procedure. Clothes must not come into contact with the floor. Contact with the floor can contaminate clothing. If the cleanroom does touch the floor, it must be replaced immediately with a clean one.

If gloves are required, clean room latex gloves or vinyl gloves must be used. Because some people are allergic to proteins in latex, if red spots appear on their hands due to the use of powder free latex gloves, they must immediately switch to vinyl gloves. Once the gloves fade or have holes, they must be replaced immediately, but they cannot be replaced in the clean room, only in the changing room. Do not casually pull or forcefully remove gloves. Instead, slowly remove the gloves from your hands.

2. Internal management

Before entering a clean environment, it is recommended to use a vacuum cleaner to clean the soles of the shoes. The size of the mat depends on the size of the entrance of the door. They are usually placed outside the dressing room, inside the dressing room, and at the entrance of the main clean room. There is no need to place a vacuum cleaner pad at the exit of the clean room. Each foot should be stepped on the mat at least twice. Regularly replace the mats that adhere to floating dust and place them outside the clean room. Replace at least two to three times a day.

It is recommended to use a specialized particulate air filter vacuum cleaner and clean it regularly. Vacuum cleaners are divided into two types: wet/dry and dry, which are very suitable for cleaning leaked pollutants. Dangerous leaked pollutants must be handled by trained safety personnel. The walls and ceilings can be vacuum dried.

It is recommended to use cleanroom wiping cloths that have been tested and meet the requirements of cleanroom classification, whether wet or dry. However, once the wiping cloth is dirty, broken, or worn, it needs to be disposed of properly. The floor should be mopped once a day or cleaned once or twice with a vacuum cleaner. In the clean room, only particulate air filtration vacuum cleaners or clean room mops with low particulate levels can be used.

It is recommended to use an aqueous solution that does not contain sodium, potassium, ammonia, iron, copper, or nickel, and regularly clean the cleanroom with a wet mop or cloth. Sometimes, it may be necessary to use detergents and disinfectants, and then rinse with water that meets cleanroom requirements, such as distilled water or deionized water. If lubricating oil is needed, first ask the cleanroom manager which lubricating oils can be used. It is usually recommended to use lubricating oil with low gas release. After adding lubricating oil, all residual lubricating oil on the surface should be wiped off to avoid the accumulation of particles on the oil.

Doors, frames, and thresholds need to be cleaned regularly. First clean the top of the door, then clean the sides and edges of the door. Use a pre soaked wiping cloth to wipe the door. Tables, carts, and other furniture also need to be cleaned regularly. Furniture should be slowly wiped with long overlapping brushes. When wiping a table or workbench, wipe from back to front. Never wipe quickly or forcefully, as this can cause disturbance to the air in the clean room. And don't forget to wipe the handcart and under the table.

It is necessary to establish an indoor cleaning procedure or hire external professionals to perform regular cleaning. The frequency of cleaning can be once a day or once a week, depending on the actual requirements. It is necessary to start cleaning from the dirtiest side of the clean room, first wiping the ceiling, and then wiping along the walls all the way to the floor. Only a small portion can be cleaned at a time and the solution and water need to be changed frequently. In addition, additional rinsing may be necessary, especially when detergent is needed. It is not recommended to use force or scrub back and forth. Clean rooms should be cleaned repeatedly using slow, pre designed straight up and down methods as much as possible.

Soft vinyl walls or curtains can be wiped with a pre soaked cloth. Start from the top of the curtains and wipe downwards until you reach the floor, then use a dry cloth to wipe off any remaining water on the vinyl walls or curtains. Only dust-free wiping cloth with edge sealing can be used. The exterior walls of the cleanroom can also be wiped with Simple Green products and non abrasive, lint free cloths.

The lighting fixtures also need to be cleaned. To ensure that the wiping cloth and solution do not scratch or corrode the lens, before cleaning, use the wiping cloth to test in a location where the lens cannot be seen. Pre wetted dust-free wiping cloth for this task. Use long overlapping brushes to clean the inside of the lamp from one end to the other, and then use the same method to clean the outside of the lamp.

The choice of wiping cloth and cleaning agent is crucial when cleaning glass, acrylic or polycarbonate windows. During the wiping process, resin sheets (acrylic or polycarbonate) windows may be scratched or cracked. Consult window manufacturers to find out which chemicals can be used for their windows. Rubber scraper can simplify cleaning work. The handle of the rubber scraper must be made of stainless steel or covered with a plastic outer layer. The blade meets the requirement of low particle detachment. Slowly move downwards from the top of the window and gently scrape repeatedly. Due to the possibility of the metal in the old blade being exposed and scratching the windows, it is necessary to regularly inspect the blade.

Ladders and footstools are important tools commonly used in clean rooms, and products that meet the requirements of clean rooms can be purchased in the market. Do not bring wooden or rusty ladders or chairs into a properly functioning clean room. Adhere to safe operation and do not stand on tables, chairs, or carts.

The products used for cleaning water buckets and dryers are self-aligning wheel devices made of stainless steel or plastic components. Water buckets, mops, and other cleaning tools must be placed in the clean room or changing room area, which is the cleaning cabinet within this area. After each cleaning, do not take the cleaning tools in the cleanroom area outside, as this may cause cross infection. Staff should be aware that some vessels may contain galvanized parts that are prone to corrosion. Once these vessels start to corrode, they should be immediately stopped from use and taken out of the clean room.

If manual tools or other materials are needed, a set of clean room tools should be kept in the clean room area for daily maintenance. Before entering the changing room, these tools should be wiped clean with a damp cloth according to the requirements of the clean room. Before entering the clean room, they should be wiped again in the changing room. All cleaning tools must be cleaned, rinsed, and dried to prevent mold and mildew before being placed in the storage cabinet.

3. Paper and containers

In the clean room, only laptops, paper, folders, and writing boards that meet the requirements of the clean room can be used. When rating a cleanroom, consult the manufacturer. Before putting clean room paper into a copier or printer, it is necessary to cooperate with the manufacturer to check the office equipment and thermal compatibility. Some types of paper may melt, leaving residues on the machine drum, causing pollution, and potentially damaging equipment.

The one-piece ballpoint pen is a clean room pen. Press and play ballpoint pens often produce metal and plastic particles when retracting the pen tip. Do not use graphite pencils in the clean room.

The container (garbage bin) for storing waste must be made of stainless steel or single piece injection molded plastic products, and a soft plastic garbage bag should be placed inside the bin. When taking out garbage, grab the four corners of the garbage bag and send it to the garbage recycling center. Seal the garbage bag and prevent the odor of garbage from dissipating throughout the clean room. Take the trash can to the changing room and wipe it clean every day, both inside and outside.

Various sizes of standard and electrostatic discharge (ESD) plastic boxes, boxes, and containers can be purchased in stores, but cardboard or wooden containers cannot be brought into changing rooms or clean rooms. These fiber material containers will generate a large amount of particles. If tape is to be used, only conductive tape or standard tape that meets cleanroom requirements can be used.

Regularly reading and strictly adhering to these principles will leave them deeply imprinted in the minds of cleanroom staff. Although it is still necessary to monitor and analyze the generation of particles, these management systems will help reduce the amount of particles generated by human factors in controlling the content of particles in critical environments.