When it comes to Electrostatic Discharge (ESD) Safety, it’s all about control – static control. The ESD Association® sets many of the global standards that are considered guiding principles for static control and ESD Safety. Devising the control of electrostatic discharge within a set environment is challenging and there are key static control concepts that are essential to the design of successful ESD control programs.
Over the years, the large variation in the types of ESD Controlled Environments has resulted in the development of standards, guidelines and manufacturing best practices that cover the requirements necessary to design, implement and maintain an organization’s ESD Control Program. ANSI/ESD S20.20 is a comprehensive standard that outlines tests and requirements that tailor the development of an ESD program for the protection of electrical and electronic parts, assemblies and equipment. More specifically, the standard sets out technical requirements, limits and test methods associated with grounding and bonding systems, personnel grounding and EPA ESD control items.
If we think about it, it is inherently challenging to reduce static generation within a Controlled Environment when one of the leading generators of static electricity is the workers (technicians) themselves. Every time they walk or move, they can generate static electricity. And, when they pick up an object or create contact or separation between two material surfaces, they may potentially be discharging thousands of volts of static charge from their body. So, how can an ESD safe environment be properly managed when one of the biggest hazards are the people themselves?
Mitigating the risk that humans pose in an ESD environment is evaluated holistically in terms of the working environment. Everything from air quality, relative humidity, walls and flooring – as well as equipment and furniture are considered. Workers are expected to wear ESD safe personal protective gear which may include garments, gloves, footwear and grounding straps with static control properties to ensure the parameters set by the ESD control program are maintained. By using the correct materials to balance static potential and creating grounding paths to prevent the buildup of electric charge, the product is protected.
Gloves and finger cots with static control properties are made of (or treated with) materials that are inherently anti-static or static dissipative or blended with conductive materials. The ANSI / ESD SP15.1 is the standard of reference for In-Use Resistance Testing Of Gloves And Finger Cots. It covers multiple resistivity tests, including:ANSI/ESD STM11.11: Surface Resistance Measurement of Static Dissipative Planar Materials
The values of each of these tests are important to electrical engineers developing an ESD program, however the CAFE resistivity test is often cited on spec sheets to help compare the static dissipative characteristics of different gloves. Depending on the type of glove and environment that it must operate in, other glove standards may be applied such as testing for chemical, heat and cut resistance – as well as cleanroom level.
Often, people will characterize ESD performance as ranging from anti-static to static dissipative and conductive. The reality is that ranges are dynamic and dependent on the materials and industry. This being said, producers of ESD safe protective gear such as gloves, clothing and accessories will still outline surface resistivity ranges because it helps more easily identify products that meet the needs of specific ESD Control Programs. Below is the illustrated range PIP® has suggested for our lines of ESD safe gloves and finger cots:
It is important to remember that ESD protective products are to be considered as a part of a comprehensive ESD Control program developed and managed by an ESD program manager or coordinator. They will develop a program that specifies building, equipment and personal protective products that meet the performance criteria outlined in their program.
PIP® offers a full range of ESD gloves and finger cots. Explore PIP’s range of ESD Safe products to discover the best options to meet a customer’s professionally managed ESD Control Program.