Indicate surface voltage and polarity of objects.
Insulators must be identified at an ESD work area and must meet the guidelines in the ESDA’s ESD Control Program Handbook-ESD TR20.20.
Non-Process Essential Insulators
If items that can charge to 125 volts or more*, then one of the following will be used:
- Remove the item from the EPA
- Permanently secure, so that insulators that charge to > 125 volts are a minimum of 1″ from ESD susceptible items at all times (12″ from ESDS if can charge 2,000 volts or more)
Process Essential Insulators
If process essential non-conductors / insulators (i.e., circuit board materials, some device packages, and test fixtures) are used in the ESD Protected Area that can charge 125 volts* or more, then one of the following will be used:
- Replace insulators with an ESD protective version (binders, document holders, packaging, foam, chair covers, etc)
- Periodically coat with Reztore Topical Antistat
- Use ionization to neutralize the charge on the item
Use the field meter to verify that the the charge generation ESD protective version products (binders, shop travelers, packaging, foam, chair covers, etc) are < ±125 volts (<±2,000 volts) and ionization test kit to verify the offset voltage (balance) and charge decay of ionization equipment.
* Static field meters are used to measure the charge generation of insulators and isolated / un-grounded conductors. Surface resistance meters are used to measure the Resistance point-to-point (Rtt) and resistance point-to-ground (Rtg).
Click HERE to learn more about Desco Digital Static Field Meter and Ionization Test Kit.