ANALYTICAL & LAB EQUIPMENT
The effectiveness of
ESD control measures relies on proper implementation by personnel
Cleaning and maintenance protocols are integral to managing ESD
should be installed to dissipate static charges effectively. Humidity levels should be precisely regulated, typically kept between 40% and 70%, while temperatures should be controlled between 18-22°C (64-70°F) to balance static reduction with other cleanroom requirements. All work surfaces, equipment, and tools should be properly grounded, creating a network that safely channels static charges away from sensitive components. Material handling procedures are
equally important in ESD prevention. PCBAs and components should be transported and stored in ESD-safe containers and packaging. In areas where non-conductive materials that cannot be grounded must be used, ionisation systems can help to neutralise static charges.
THE IMPORTANCE OF CLEANING Cleaning and maintenance protocols are integral to ongoing ESD control. Effective cleaning in PCBA assembly is not just about removing contaminants but also about preventing ESD. Some cleaning fluids can generate significant static charges, worsening the ESD risk rather than mitigating it. For example, certain flux removers can
produce static as high as 12,000 volts owing to friction when dispensed from aerosol cans. To address this, manufacturers should use specially engineered static-dissipating tools that attach to the aerosol can to minimise the generation of static charges to just over 50 volts. In addition, regular use of pre-
saturated ESD-dissipating cleaning wipes can significantly reduce static build-up. These wipes effectively remove contaminants like fingerprints and grease without leaving lint, debris or static charges. They should be used in straight lines with overlapping strokes to ensure thorough coverage. It’s advisable to choose wipes with low/no alcohol content to prevent drying out surfaces and causing damage. An ESD-safe controlled flux remover
dispensing system is another tool that helps to manage ESD and improve cleaning outcomes. This system allows technicians to apply flux remover in a controlled manner, reducing waste and ensuring that the cleaning process does not introduce further static. Brushes attached to these systems can help clean under surface-mounted components more effectively while also grounding the cleaning tool to end any charge build-up.
TRAINING AND MAINTENANCE The effectiveness of ESD control measures relies on proper implementation by personnel meaning comprehensive training programs should be set up. All staff working in or entering the cleanroom should undergo regular ESD awareness training. Manufacturers should conduct
periodic audits of ESD control practices and equipment to ensure ongoing effectiveness and verify compliance with regulations.
EFFECTIVE ESD CONTROL Effective ESD control in cleanroom manufacturing medical devices is critical to the ongoing battle against electrostatic discharge. By minimising ESD-related damage, manufacturers significantly enhance the long-term reliability of their devices. This reduces costs associated with warranty claims, rework, and product recalls. Microcare is a precision cleaning solutions company based in the US.
For more information visit:
www.microcare.com
www.scientistlive.com 17
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