How to buy a real anti-static document bag
The anti-static document bag has the advantages of anti-static, anti-wrinkle, moisture-proof, dust-proof, good sealing, etc., long-term anti-static, and the surface resistance value is 10 to the 8th power. The document bag has a wide range of uses and is used in the anti-static workshop in a clean room, such as storing important documents, precious pictures, certificates, drawings, etc.
How to identify the real anti-static document bag? This is a question that many users think of before buying. Is the file bag not coated? The one I bought before has no effect after a while? In response to these issues, the following editor will explain to you.
Why is the electronic document bag purchased by the customer, when it is tested with a surface resistance tester, it can detect about 10E9-10E10 powers, and then after a period of use, the effect is not detected in the next test? ? This so-called anti-static bag is only temporary anti-static. Why is it called temporary? That is, it has only a short anti-static life. With daily wear and tear, the more wear, the shorter the anti-static life will be. As time passes, it becomes ineffective. The main characteristic of this kind of electronic document bag is generally: after a period of use, the test has no effect, or the effect is very poor, and it is close to insulation.
Then how can I buy a real anti-static document bag? First learn to detect, the important step is to use the instrument to detect. The simple method is to use two instruments to detect: 1. Surface resistance tester, 2. Friction voltage tester.
1. The surface resistance tester detects its surface electrostatic effect, generally within the power of 10E7-10E10. The accuracy of this instrument is relatively good. It is generally not recommended to use domestically made instruments, which are only accurate Within the 10E7th power, the imported products are very good if conditions permit.
2. Friction voltage tester, regardless of anything that is not anti-static, as long as the product is tested with this instrument, if the product voltage exceeds 100V after friction, it is not a qualified anti-static product, of course it depends on your product Industry testing standards, or less demanding ones will require less than 200V. (Recommended instruments are: SIMCOFMX-003, American ACL-350, etc.)
3. Test every time. If it is a real anti-static document bag, the more it is used, the more stable it will be.