Comprehensive analysis of anti-static ESD aluminum foil bags
1. Materials and structure
Multi-layer composite design
The typical structure is an outer layer (PET or NY), an intermediate aluminum foil layer (AL, thickness ≥7μm), and an inner anti-static coating (PE or CPP, containing anti-static agent). Some products use a four-layer composite process (such as PET/AL/PE/anti-static layer) to enhance the shielding effect.
Core features
Aluminum foil layer: Provides electromagnetic shielding (EMI/RFI protection) and blocks oxygen and water vapor (WVTR≤0.31g/m²·24h).
Anti-static layer: Surface resistivity 10^8~10^11Ω, and electrostatic discharge is achieved through conductive coating or electrostatic dissipative materials.
2. Core functions
Electrostatic protection: Avoid the risk of breakdown of electronic components (such as IC chips and PCB boards) due to static electricity accumulation.
Electromagnetic shielding: The aluminum foil layer can block more than 80dB of electromagnetic interference, which is suitable for communication equipment and medical instrument packaging.
Physical protection: moisture-proof, light-proof (aluminum foil transmittance <0.1%), puncture-resistant, meeting the long-term storage needs of chemical raw materials and medicines.
3. Application scenarios
Fields Applicable scenarios Electronic industry Packaging of electrostatic sensitive devices such as integrated circuits, hard disks, optical drives, etc. Pharmaceutical chemicals Moisture-proof and light-proof storage of pharmaceutical intermediates, photosensitive chemicals, and biological reagents Food packaging Vacuum packaging of foods such as coffee and nuts that need to be kept away from light (must comply with food-grade PE/CPP inner layer standards)
4. Performance parameter standards
Indicators Parameter range/requirements Surface resistivity 10^8~10^11Ω (complying with ESD S541 standards) Water vapor transmission rate ≤0.31g/m²·24h (ASTM E96 test) Oxygen transmission rate ≤0.5cm³/m²·24h (ASTM D3985 test) Minimum heat seal strength ≥3.0N/15mm (GB/T 21302 standard)