Electrostatic Discharge Control in Semiconductor Cleanrooms

Why electrostatic discharge is critical in semiconductor and microelectronics cleanrooms

Semiconductor and microelectronics components are increasingly miniaturised and more sensitive to electrostatic phenomena.

Across semiconductor and microelectronics manufacturing, from wafer processing to assembly, packaging, inspection and testing, uncontrolled electrostatic discharge can cause immediate device failure or latent defects that only appear later during use.

In cleanroom environments, the friction between human body and clothing is among the main sources of electrostatic charge. Hands are particularly critical because they are directly involved in component, substrate and tool handling. Inadequate electrostatic control at this level can significantly impact yield, reliability and overall manufacturing performance.

Electrostatic discharge control is therefore a fundamental requirement in semiconductor and microelectronics cleanrooms.

Understanding electrostatic discharge in microelectronics and cleanroom environments

Electrostatic discharge, commonly referred to as ESD, is the rapid transfer of electrical charge between objects with different electrostatic potential. 

Static electricity is most often generated through tribocharging, which occurs when materials come into contact and are then separated.

In cleanroom environments, activities such as handling components, wiping surfaces or operator movement can generate electrostatic charge. Electrostatic induction can also occur when a charged object influences another without direct contact. When a conductive path is created, accumulated charge may discharge abruptly.

In microelectronics manufacturing, even very low energy discharge events can be sufficient to damage sensitive devices.

Grounding and controlled charge dissipation

Grounding, also known as earthing, is central to electrostatic discharge control in semiconductor cleanrooms. Rather than attempting to completely insulate operators or equipment, ESD strategies aim to promote controlled dissipation of electrostatic charge to earth.

In this context, it is important to use accurate terminology. In practice, an ESD glove is expected to behave as a static dissipative glove and to support controlled charge dissipation when the operator is correctly grounded. The generic term anti-static is widely used, but it can be misleading because it may refer to materials with limited ESD performance and behaviour close to being insulative.

When operators, work surfaces and equipment are properly grounded, accumulated charge can be released gradually rather than appearing as a sudden discharge. Disposable cleanroom gloves used in ESD sensitive cleanroom environments must therefore remain compatible with grounding systems and must not interrupt normal charge dissipation pathways. Gloves with strongly insulative behaviour may trap electrostatic charge at the hand interface, increasing the risk of electrostatic discharge events.

The role of disposable gloves within ESD control systems in microelectronics

Disposable gloves are primarily used in cleanrooms to protect the process from contamination, but they also influence electrostatic behaviour.

In ESD sensitive environments, their role is not to actively control electrostatic discharge, but to avoid becoming an additional source of electrostatic risk within the overall ESD control system.

In semiconductor and microelectronics cleanrooms, disposable gloves must therefore be selected so that they do not interfere with established ESD control measures. In particular, they should limit charge generation during use and remain compatible with grounding systems and controlled charge dissipation pathways.

Inappropriate cleanroom glove selection can compromise otherwise well designed ESD prevention strategies by allowing electrostatic charge to accumulate or remain trapped at the hand interface.

What defines an ESD suitable cleanroom glove for semiconductor and microelectronics cleanrooms

An ESD suitable cleanroom glove is defined by how it behaves within a complete ESD control system, rather than by generic wording alone.

In practice, such gloves are expected to exhibit static dissipative behaviour and to support controlled charge dissipation when the operator is correctly grounded.

Key characteristics of ESD suitable disposable gloves

• Behaviour that limits electrostatic charge generation rather than insulating the hand
• Electrical properties compatible with controlled charge dissipation
• Compatibility with grounding systems and ESD procedures
• Cleanroom suitability, including controlled particle and extractable levels

Why ESD suitability goes beyond anti static claims

The generic term anti-static is widely used but can be misleading. A cleanroom glove described as anti static may reduce charge generation under certain conditions while still behaving as a poorly dissipative or near insulative material during real use.

For semiconductor and microelectronics applications, ESD suitability should therefore be evaluated based on how the glove behaves within the full ESD control system, rather than on generic claims alone.

Assessing glove electrostatic behaviour through measurement

Objective testing is required to understand how a glove behaves when integrated into an electrostatic discharge control system.

In practice, this is based on recognised test methods, described in the EN 1149 standard series (EN 1149-1:2006,
EN 1149-2:1997 and EN 1149-3:2004), which are widely used to assess the electrostatic properties of materials.

Rather than relying on a single parameter, a combination of complementary measurements is used to characterise glove behaviour. These measurements describe glove's surface resistivity and vertical resistance properties (expressed in ohms), as well as the ability of accumulated charge to dissipate over time (Decay charge time). Together, they help determine whether a glove may contribute to electrostatic charge build up or remain compatible with controlled charge dissipation when the operator is correctly grounded.

Because electrostatic behaviour can be influenced by environmental conditions (e.g. relative humidity) and actual use, measured data provide a more reliable basis for cleanroom glove selection than generic wording, particularly in semiconductor and microelectronics cleanroom environments.

Nitrile gloves intended for ESD sensitive applications are designed to exhibit static dissipative behaviour, although their electrical performance may vary depending on the glove and the intended process.

SHIELD Scientific provides ESD certificates on request, documenting these EN 1149 based measurements. These certificates enable users to assess glove suitability within their specific process and electrostatic discharge control strategy.

Choosing the right glove material for semiconductor and microelectronics cleanrooms

Material selection directly influences both contamination control and electrostatic behaviour in semiconductor and microelectronics cleanrooms.

Cleanroom nitrile gloves are widely used in these environments because they can be processed to limit contamination while offering electrostatic behaviour compatible with ESD control systems.

Indeed, beyond electrostatic properties, glove selection in ESD sensitive environments should also take into account cleanliness criteria related to particle and ionic contamination. Particles and extractable ionic residues can contribute to yield loss, corrosion phenomena or electrical reliability issues, particularly in advanced microelectronics processes.

For this reason, selecting disposable gloves solely on the basis of ESD behaviour may be insufficient. A global risk assessment should also consider the glove’s particle release level and its ionic cleanliness, alongside electrostatic performance requirements.

SHIELD Scientific displays particle and ionic cleanliness data in the Gloves Data Sheets available online for its cleanroom gloves designed for sensitive environments. This allows users to integrate these parameters into their overall glove selection strategy.

Latex gloves may provide excellent tactile sensitivity, but their use depends on allergy considerations as well as cleanroom and process compatibility. With regard to ESD control, natural rubber latex is generally considered to exhibit isolative behaviour. As a result, the use of latex gloves should be carefully considered in environments requiring ESD control.

SHIELD Scientific solutions for semiconductor cleanrooms

As a manufacturer of disposable gloves for controlled environments, SHIELD Scientific develops cleanroom glove solutions designed to support contamination control while remaining compatible with electrostatic discharge control strategies.

Relevant internal resources include:

Cleanroom gloves

SHIELDskin XTREME™ cleanroom glove range

These solutions are intended to integrate into broader cleanroom and ESD control systems.

Disposable gloves within a global ESD control programme

Disposable gloves alone do not provide electrostatic discharge control. They represent one element within a global ESD control programme that also includes grounding, garments, flooring, tools and work surfaces.

Because hands are directly involved in component handling, selecting cleanroom gloves that do not introduce additional electrostatic risk is essential for maintaining consistent ESD control in semiconductor and microelectronics cleanrooms.

For a general approach to electrostatic risk management, see our dedicated page about ESD hazards.