How to judge the cleanliness of cleanroom dust-free cloth?

author: Alice
2023-03-15
Cleanroom dust-free cloths are designed to be extremely clean and free of contaminants. The cleanliness of a cleanroom dust-free cloth can be evaluated based on several parameters, including:
* Particle count: The number and size of particles on the cloth's surface are measured using specialized particle counters. The lower the particle count, the cleaner the cloth.
* Extractables: Extractables are organic and inorganic compounds that can be released from the cloth's surface when it comes into contact with liquids. The lower the extractable level, the cleaner the cloth.
* Ionic contamination: Ionic contamination refers to the presence of ions, such as sodium or chloride, on the cloth's surface. Ionic contamination can cause damage to sensitive electronic devices. The lower the ionic contamination level, the cleaner the cloth.
* Non-volatile residue (NVR): NVR is the amount of residue left on a surface after a solvent evaporates. The lower the NVR level, the cleaner the cloth.
Cleanroom dust-free cloths are manufactured and packaged in controlled environments to minimize the risk of contamination. They are typically made from materials such as polyester, nylon, or microfiber, which are low-shedding and have excellent wiping properties. Overall, the cleanliness of a cleanroom dust-free cloth is critical in maintaining the cleanliness and integrity of a cleanroom environment.
 
Cleanroom dust-free wiping cloth is a cleaning tool. Compared with traditional rags, it has the advantages of high cleanliness, strong adsorption, and no dust when wiping, and is deeply loved by industrial users.
Here are some ways to define cleanliness:
 
1. The amount of dust generated by dust-free fabrics.
This test is divided into two types, one is the release of dust in the air (APC), maybe you feel that since the cleanroom dust-free cloth is dust-free, it should not drop dust when shaking. In fact, any fiber weaving machine will shed chips when it shakes, but the amount is different. At present, it is mainly realized by blower. The other is to detect the amount of dust released in the liquid (LPC), which is to immerse the cleanroom dust-free cloth in a certain amount of deionized water, and measure the concentration of dust particles in the deionized water through ultrasonic oscillation.
 
2. The precipitation of ions in the cleanroom dust-free cloth.
Based on the test after immersion in deionized water, highly active metal ions and non-metal ions can be detected. In precision metal materials, highly active ions are easily destroyed by chemical reactions. There is no doubt that ion precipitation is an important detection index.
 
3. The non-volatile residual amount of the cleanroom dust-free cloth in the solvent.
In other words, the detection of residues after use is mainly to detect non-volatile substances. The tissue composition of the test cleanroom dust-free cloth is the test material. What kind of solvent is generally used, and what kind of solvent is used in the evaluation. In addition, the user can also determine whether the residual amount of the cleanroom dust-free cloth is within the required range by whether there is fog when scrubbing, but pay attention to the influence of light, and the intensity of strong light will affect the judgment.

After testing and analysis, it can meet the use requirements of a single dust-free workshop.

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