Successful DIN EN 61340-5-1 Certification at Leesys – 07/2017

The DIN EN 61340-5-1 certification audit by the ESD Akademie took place at Leesys GmbH in May, 2017. Thus Leesys documented that the ESD control programme for the protection of electronic components against electrostatic discharges meets the requirements of DIN EN 61340-5-1. Leesys is very pleased about the successful certification.

 
ESD – The Invisible Danger

 
Electrostatic discharge (ESD) is an everyday phenomenon: only a brief contact between two bodies produces an electrostatic charge which discharges itself again on contact with another body. This can cause irreversible damage to electronic components and have negative financial consequences.
In electronics manufacturing, electrostatic discharges can lead to, for example, damage to electronic components. In addition to directly identifiable defects, a fault can also manifest itself in such a manner that the required reliability of a product is no longer guaranteed due to a latent, pre-existing defect.
Its consequences, nevertheless, can be wide-ranging and become expensive, especially if the components are installed in equipment for use in sensitive areas of application, for example, in medical or automotive engineering.

 
ESD is not avoidable, but is controllable

 
Electrostatic charging and discharging cannot be avoided but can be easily safely controlled. The charging can take place in two ways. Always when two materials come into contact, an exchange of charges takes place. If one of the materials has an insulating effect, high voltages occur on separation. This effect is called triboelectric charging and is known in everyday life as static electricity, for example when walking over a carpet.
How high the electrostatic charge of a person is, is dependent on various factors. Room temperature and humidity play important roles. Depending on the circumstances, a charge of 35,000 volts and more can be reached. In most cases this is not critical and on discharge is simply felt to be unpleasant so that the shock reflex represents the greatest potential hazard.
The far-reaching significance of ESD protection was first recognized at the end of the 1970s in the last century. Nowadays there is a whole range of national and international standards. The most important standard for electronics engineering is DIN EN 61340-5-1.

 
Only consistent implementation achieves the desired results

 
The requirements on the ESD protection area are many and varied. In addition to ESD compliant workplace surfaces, ESD compliant clothing and ESD compliant production equipment, ESD compliant flooring is an important element. It serves the purpose of the discharge of the existing electrostatic charges of people and vehicles, etc. The floor must, therefore, be electrostatically conductive.
In order to comply with the ever increasing requirements and to raise even further the ESD protection at Leesys, the existing ESD floor in the production area has been refurbished. Through the use of the automatic guided vehicle transport system in the production area, it was also especially important to meet the high mechanical loads placed on the floor. For this reason, the transport routes of the "yellow cabs" have been re-laid in three layers.

After priming with an environmentally friendly, water-emulsifiable 2-component epoxy resin layer, copper strands were laid as earthing elements. The subsequently processed black colour ESD conductive layer served as a cross conducting layer in the electrically conductive coating systems. After 24 hours drying, the electrostatically conductive, highly mechanical load resistant top layer was able to be applied.

 
The employees at Leesys, too, receive continuous in-depth training and have a good ESD specialist knowledge. A training plan specifies the complete employee groups which require training with regard to ESD awareness and ESD precautionary measures. To this belong initial and refresher training which must take place before the handling of ESD-sensitive components.

 
Through the consistent implementation of the measures described, which require a great deal of specialist knowledge and control activity, the desired result was achieved.

 
Following a successful audit, the achievement was attested at the start of May, 2017, with the award of the DIN EN 61340-5-1 certificate by the ESD Akademie.