Our dry cabinets & dry storage solutions provide a small (<0.5%), controlled level of humidity. Moisture absorbing materials including digital elements, circuit boards, nano materials, contact lenses, laboratory samples as well as other susceptible materials are maintained dried out and clear of water ingress. The dehumidification to lower than .5% RH is eligible Low Humidity Cabinets not only for unlimited secure storage space, but also means they are able to securely remove dampness, thus resetting flooring life without oxidation, even at ambient temperatures.
Solutions for your storage space of electronic elements and compositions to prevent two of the most popular defect triggers: Oxidation and Diffusion.
The storage space of digital elements and compositions is challenging, and more and more so due to two issues.
As a result of fast modifications in packaging design and material, many companies end up forced to buy extra quantities of elements in order to guard against the impact of element obsolescence on the last product designs. As a result creates a concern of long term stock storage space
Product lifecycles are becoming very short with new models coming out faster than ever before. Nevertheless, numerous manufacturers, such as automobile providers, should guarantee the accessibility of substitute parts including PCBs for as much as a decade. This example also necessitates the advance purchase and prolonged storage of elements and components. Further complicating however , most components cannot be stored for over 10 many years without very special dealing with procedures.
Component micro-cracking resulting from the intake and rapid release of dampness. The largest threat posed is humidity. It is the cause of two of the most popular defect triggers: Oxidation and Diffusion.
Due to surface area oxidation, components and PCB’s can suffer from decreased solderablity, which frequently brings about total malfunction. Diffusion of vapour and noxious elements within the internal structure from the elements or PCB’s can result in long term disintegration of conductor pathways and isolation layers. Each risks can be prevented by correct handling and dried out storage.
The oxidation process – contact rust
In an extremely-dried out atmosphere there is not any rust. For rust to take place, two needs has to be fulfilled: there should be a method of oxidation as well as a watering remedy, which functions as an electrolyte. The o2 in the atmosphere types the way of oxidation, the vapour (moisture) the electrolyte. The critical restrict at which oxidation with oxygen occurs is situated according to the metal or alloy at between 40 to 70 % RH. This means that a lot more than 8 grams of vapour for each m³ must be present.
Solution 1: Dried out Storage space Cabinet
The absolute humidity in Dry Storage Cabinets For Optics is situated at a temperature of 20 °C and <2%RH with less than 0.35 g/m³. Under these conditions no cathode reaction is present and no oxidation can take place.
Solution 2: Moisture Buffer Bags
In moisture protection bags loaded below vacuum having a relaxation pressure of ca. 6 mbar you will see between .1 and .06 g vapour for each m³. If the hand bags are loaded with nitrogen, neither a means of oxidation, neither an electrolyte are available, and oxidation is impossible.
The Diffusion process
The vapour in the environment diffuses into hygroscopic materials. The reason for this is actually the so called vapour stress – what this means is the part stress of the vapour that is present in the air. The higher the vapour stress, the quicker the constituents or PCB’s absorb humidity and with this the permissible handling time reduces.
All components courses 2a to 5a in accordance with the classification of IPC/JEDEC J-STD020D soak up no moisture having a vapour stress of < 2.82. At this particular level they can be stored and refined indefinitely.
ProDry Storage space Cabinets maintain over twenty four hours typically a vapour stress of < 0.95 mbar reliably and effectively protecting from moisture diffusion. For Dehumidifying Dry Cabinets of over 5 many years, a mix of the two systems anmtvj suggested. The storage in moisture safety bags with nitrogen existing inside a simple dry storage cupboard with 5 % RH.