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| Faraday cage protects shelf contents against ESD |
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Desiccator Grounding
All Terra desiccators made of static-dissipative PVC feature grounding terminals on a standard basis. The surface resistivity of this material (around 107 ohms/square) allows controlled dissipation of static charges from any surface in the cabinet, including shelves. Conductive grounding connections safely direct charges to a grounding terminal (standard on SDPVC cabinets; order separately for acrylic cabinets below).
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Desiccator Grounding
Includes installation of conductive grounding tape and grounding terminals. Charge is per chamber; quantity should correspond to number of chambers affected. (Included standard on cabinets made of static-dissipative PVC.)
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1600-59A |
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| Warning: Grounded conductive connectors can create sparking, which can damage sensitive materials. Use of a resistor (not included) is recommended. |
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1. Static-Dissipative PVC
Acrylic, the most common plastic used in storage enclosures, is a prolific static generator. The act of cleaning an acrylic desiccator with a cleanroom wiper is enough to generate surface charges that can discharge onto semiconductor components. One way to avoid potentially disastrous static damage is to select Static-Dissipative PVC.
This material not only dissipates static charges safely, but it also eliminates the particle attraction that static charges create. Surfaces stay clean, inside and out, making this material perfect for use in Class 1 cleanrooms.
Because static-dissipative PVC is transparent and highly durable, it can be used in place of acrylic in nearly any application, desiccators included. It features a surface resistivity of approximately 107 ohms per square, placing it in the "dissipative range". It is completely noncontaminating—with no measurable outgassing—and it resists a wide range of chemicals.
Note: To protect Static-Dissipative PVC surfaces, desiccators made of this material must include stainless steel shields installed at the bottom of each chamber.
2. Self-Balancing Ionizing Nozzles
By ionizing nitrogen molecules as they pass through the desiccator plenum wall, ionizing nozzles neutralize electrostatic charges on all interior surfaces. They provide practical ESD control for charged nonconductive materials, which cannot dissipate charges to ground. And because they eliminate static attractive forces, they help control contamination: in a statically neutral environment, any airborne particles that enter a desiccator are more likely to remain airborne and to be purged out of the cabinet.
3. Conductive Shelves, Shields and Trays
For smaller components that can be stored on shelves, Terra's grounded stainless steel shelving provide a 100% ESD-safe enclosure.
As the illustration depicts, grounded conductive plates (such as shelves) create a Faraday cage that prevents penetration of static charges. Because these conductive units are removable, they also protect your sensitive components from ESD as you transport them from one location to another.
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By dissipating static charges, Static-Dissipative PVC also eliminates particle attraction, providing animportant contamination-control benefit! |
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