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Knowing the Difference Between Clear Acrylic and Static Dissipative Acrylic Materials
Clear acrylic desiccators are recommended for non-electro-static (ESD) sensitive storage applications. Often these desiccators are utilized in cleanroom storage of wafers, reticles, photomask, and other contents that are less susceptible to ESD discharge events. Although acrylic desiccators may attain a highly charged condition, it can be mitigated with the proper precautions. Cleanrooms routinely maintain 45/55% relative humidity control, which provides a layer of moisture on exposed surfaces. This conductive layer facilitates discharging the static electricity to ground. Grounding is recommended on acrylic desiccators to accelerate these discharges.
Static dissipative acrylic desiccators provide complete electrostatic discharge protection for ESD sensitive components. Our static dissipative acrylic material offers a surface resistivity of 106-108 Ohms/sq. and cannot be tribocharged when properly grounded. Stainless steel shelves, plates, shelf racks, door latches, and hinges are commonly grounded to the desiccator and wire connect to hard ground. Stainless steel plates are required for enhanced grounding and provide protection from surface abrasion when you use the floor of the compartment as an additional shelf.
Although static dissipative acrylic desiccators are recommended for electrostatic discharge (ESD) sensitive storage applications, clear acrylic desiccators may be utilized as an economic alternative in certain applications. To use a clear acrylic desiccator to store ESD sensitive components you must include stainless steel shelves and plates with our grounding option. The components must also be stored in ESD safe storage bags, totes, or other type of protective packaging. Clear acrylic desiccators remain susceptible on the acrylic material surface to static charging and are not recommended in critical ESD assembly locations.
Stainless Steel Desiccator Cabinets
Stainless steel desiccators provide clean, high-density storage for both cleanroom and assembly applications. Compared to acrylic desiccators, stainless steel provides maximum weight capacity and longer durability. Constructed of heavy-duty conductive stainless steel. Wire grounding is an option. stainless steel desiccators meet stricter insurance requirements as well as providing part storage privacy.