How to judge the quality of anti-static ESD PE bags
1. Material and appearance inspection
Appearance integrity
The surface should be smooth without impurities, bubbles or burrs, uniform color and without scratches, creases and other defects.
Poor-quality products may have black spots, delamination or loose seals, which need to be inspected visually and by hand.
Material verification
High-quality anti-static PE bags use high-purity LDPE with permanent antistatic agents, while inferior products may be mixed with recycled materials or short-term antistatic agents.
Burning test: Pure PE burns yellow with wax dripping and candle smell; mixed PVC is difficult to burn and emits black smoke.
2. Electrical performance test
Surface resistance value
Use a surface resistance tester to detect, the normal range is 10⁶Ω to 10¹²Ω (the best range is 10⁸Ω-10¹²Ω).
If the surface resistance is too high (such as >10¹²Ω) or too low (such as <10⁶Ω), the anti-static effect may be lost.
Electrostatic decay test
The electrostatic decay time should be less than 2 seconds to ensure that the charge can be quickly dissipated, in line with the MIL-B-81705B standard.
3. Physical performance testing
Thickness and uniformity
The thickness range is generally 0.03-0.2mm. Use a thickness gauge to measure at multiple points. The deviation must be less than ±5% to ensure protection.
Insufficient thickness (such as <0.06mm) can easily lead to a decrease in puncture resistance.
Tensile and tear strength
The tensile strength must be >15MPa, and the tear strength should be ≥40kN/m. Tested by a tensile testing machine according to GB/T 1040 standard.
4. Environmental adaptability verification
The influence of temperature and humidity
High temperature (>60℃) test: Observe whether the bag body softens and deforms or the coating falls off. Inferior products may lose their anti-static properties.
Low temperature (such as -20℃) test: Check whether it is brittle and cracked to ensure that the material can still maintain toughness in extreme environments.
Aging stability
After accelerated aging experiment (such as 72 hours in 85℃/85%RH environment), the change rate of anti-static performance should be less than 10%.
V. Chemical testing and safety certification
Composition analysis
Infrared spectroscopy or gas chromatography detects whether the material contains banned plasticizers, heavy metals and other harmful substances.
Certification standards
Comply with international anti-static standards such as IEC 61340-5-1 or ANSI/ESD S541, and give priority to products that provide third-party test reports.
VI. Practical application verification
Simple test method : Put static electricity generators (such as plastic sheets) into the bag, apply static electricity externally, and use a detector to verify the charge dissipation ability.
Sealing test : After filling with air, squeeze it, and there is no air leakage at the seal to prevent the intrusion of pollutants.
By combining the above detection dimensions, the protection effect and reliability of anti-static PE bags can be systematically evaluated to ensure that they meet the packaging needs of electronic components, precision instruments and other fields.