Safety Practices for Electrical Discharge Machining Beryllium Copper

Beryllium copper, in solid form and as finished parts, presents no particular health hazard. In addition, most manufacturing operations conducted properly on well-maintained equipment are capable of safely processing beryllium copper. Like many industrial materials, it poses a health risk only if mishandled. Breathing very fine particles may cause a serious lung condition in a small percentage of individuals. Risk from processes generating fine particulate can be minimised with simple, proven, and readily available engineering controls such as ventilation. Information on safe handling procedures and on the nature of the risk associated with beryllium inhalation is available from Instrument Specialties.

The EDM process generates fine metallic particles which can be a hazard if the particles are inhaled. The machining action takes place in a dielectric fluid which serves to control the spark, cool the work, and flush the machining swarf from the machining area. The metallic particles accumulate in a sump for eventual disposal. The dielectric fluid should be filtered to minimize build-up in the solution.

While most of the swarf is contained in the dielectric fluid, a small fraction may become airborne if the operation of the EDM equipment produces a fine mist. In this case, ventilation must be provided above the machine to insure capture of the mist.

Disposal of fine scrap or sludge must be done carefully. While the dust is considered non-hazardous for landfill disposal, it must be packaged and handled in a manner that prevents it from becoming airborne during collection and disposal. Particulate from the sump presents minimal hazard if it is kept wet during removal and disposal. Do not allow particulate to be handled dry, as this increases the risk of air contamination. Ventilation must be provided if the particles are handled in a manner that causes air contamination. Where adequate ventilation is not possible, respirator protection must be provided.

If there is a concern about the safety of these operations in your shop, consult an industrial hygienist who can measure the air concentrations during the EDM operations. Most hygienists can also recommend equipment and procedures to allow you to perform these operations safely.

This information applies to a specific manufacturing operation. If you need additional information on safe handling practices or technical data on beryllium products, contact Instrument Specialties Delaware Water Gap P.O. Box 650, Shielding Way Delaware Water Gap, PA 18327 Tel: +1.570.424.8510 Fax: +1.570.424.6213

All material presented courtesy of
Brush Wellman, Inc., Cleveland, Ohio and
Instrument Specialties Company Inc., Delaware Water Gap, PA.