Keeping Static Under Control – Quadrant Semitron® ESd Materials

We’ve all felt the snap of static electricity, after walking across carpet and touching a light switch or folding laundry fresh from the dryer. Now, imagine that unexpected spark in an industrial setting. Not good!

Contact or continuous rubbing of two insulative materials can produce potentially dangerous arcing. This is because static build up is insulated against finding a path to discharge from the mating contact surfaces. Most plastic materials are “insulators” (typically described as having a Surface Resistivity of > 1012 ohm/square) and are prone to this problem. As a result, static control solutions are typically required in applications such as sensitive electrical assembly fixturing or chip carriers; high-speed printer parts; medical electronic assemblies; and material handling components.

Quadrant is an industry leader in providing specially formulated materials for electrostatic dissipation (ESD). Our Semitron® ESd family of materials help control and manage static electricity through specially compounded insulative base materials and fillers, providing safe, cost/performance options for a variety of ESD needs:

  • Semitron® ESd 225 Static Dissipative Acetal – This tan, acetal-based material has a surface resistivity range of 109 – 1010 ohm/square, making it an excellent general purpose fixturing material for applications up to 225F with good wear resistance.
  • Semitron® ESd 300 Static Dissipative PET-P – This black, polyester-based compound has a surface resistivity range of 106 – 109 ohm/square. It is an excellent step up product from Semitron ESd225 if you are looking for a material with low moisture absorption, higher stiffness, improved dimensional stability, or tighter machined tolerances. It can meet your ESD needs up to 240F.
  • Semitron® ESd 410C Static Dissipative PEI – With a lower resistivity range of 103 – 106 ohm/square, this black, polyetherimide-based material is capable of bleeding away a surface charge faster than previous grades; offers improved tight tolerance machining and stiffness; and will perform in your applications up to 410F.
  • Semitron® ESd 420 Static Dissipative PEI – This PEI grade offers more dissipative properties than the Semitron® ESd 410C. With a surface resistivity of 106 – 109 ohm/square, it will operate effectively at temps up to 410F. Most effective in incidental contact applications.
  • Semitron® ESd 480 Static Dissipative PEEK – This PEEK grade is a step up from the previous grades, exhibiting excellent chemical resistance, low moisture absorption, high stiffness, and excellent machinability, with a surface resistivity range of 106 – 109. It is black in color and can be used in applications up to 500F.
  • Semitron® ESd 500HR Static Dissipative PTFE – With an excellent combination of low frictional properties and dimensional stability, this PTFE grade is an ideal replacement for standard PTFE where a controlled bleed of static charges is desired. It is white in color, with a surface resistivity of 1010 – 1012 ohm/square, and can be used in applications up to 500F.
  • Semitron® ESd 520HR Static Dissipative PAI – This is Quadrant’s highest temperature ESD material, good for applications up to 510F. With a surface resistivity of 1010 – 1012, this compound has the unique ability to resist dielectric breakdown at high voltages (>100 volts), making it an ideal material for automated test handlers.

Say goodbye to static with Quadrant’s Semitron® ESd family of materials. For additional help determining which material is best for your application, the Quadrant support team is standing by to assist you.

 


Gary Clauss
Application Development Manager/Yorba Linda, CA

 

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