Why electronics trays must be static-safe
PCBs, connectors and delicate components face two risks in transit: electrostatic discharge and physical collision. Common thermoforming materials such as PVC and PET are highly insulating — friction builds up static charge that can damage sensitive parts in an instant. That is why electronics trays are required to keep surface resistance in the anti-static range while cavities hold and separate each part.
Common materials and resistance levels
Mainstream electronics trays use PET/APET with anti-static additives or coatings; high-requirement jobs use conductive-modified PP or PC. By surface resistance there are three tiers: static-dissipative 10^6–10^9 Ω for daily handling, conductive 10^4–10^6 Ω for static-sensitive chips, and 10^3–10^5 Ω conductive grades used with grounding. Confirm the required resistance range and test conditions (humidity, test voltage) first — and align on which standard applies (ANSI/ESD S541, IEC 61340).
Cavity and structure design
A cavity is not simply a 'hole'. Size it to the part with appropriate clearance; deep cavities need draft angles and controlled draw ratio to avoid thin-wall cracking. Add ribs and locating bosses on the base so parts do not shift and rub during vibration. Power components may need ventilation holes; anti-mistake parts use asymmetric cavities. Thermoforming thins material at sharp corners — prefer radiused transitions to keep both strength and uniform static performance.
Process and consistency control
Static performance depends on how evenly the additive is dispersed in the sheet — not on a sprayed-on coating of reassurance. Choose masterbatch-blended anti-static sheet and ask your supplier for per-batch resistance reports; after forming, sample surface resistance across regions including edges and flat areas. Humidity changes readings (higher humidity lowers resistance), so retest under the customer's specified conditions before shipment.
Advice for buyers and designers
Start by defining what you are protecting against: handling damage, ESD sensitivity level, or vibration and stacking loads in export shipping. Different scenarios call for different materials, thicknesses and test standards. Send us your drawing or actual parts — we will propose material, a cavity draft and target resistance range, then validate with samples.