Our dry cabinets And dry storage space solutions deliver a minimal (<0.5%), controlled level of humidity. Moisture absorbent materials such as electronic components, circuit panels, nano materials, contact lenses, lab examples and other susceptible components are maintained dried out and free of water ingress. The dehumidification to lower than .5% RH is eligible Moisture Control Cabinets not just for unlimited secure storage space, but also indicates they are able to securely eliminate dampness, therefore resetting floor life without oxidation, even at background temperature ranges.
Solutions for that storage space of electronic components and compositions to prevent two of the biggest defect triggers: Oxidation and Diffusion.
The storage space of digital elements and compositions is challenging, and increasingly so as the result of two issues.
As a result of rapid changes in packaging design and materials, a lot of companies wind up required to purchase extra quantities of elements so that you can shield from the effect of component obsolescence on their own last product styles. This in turn creates a concern of long term stock storage space
Product lifecycles are becoming very brief with new models coming out faster than ever before. However, many producers, like automobile suppliers, should ensure that the accessibility of substitute components such as PCBs for approximately ten years. This example also necessitates the advance buy and extended storage of elements and materials. Further complicating however , most components cannot be stored for longer than 10 years without having special handling procedures.
Component micro-cracking as a result of the absorption and fast discharge of dampness. The greatest danger posed is moisture. It is the reason behind two of the most popular problem triggers: Oxidation and Diffusion.
Due to surface oxidation, components and PCB’s can are afflicted by decreased solderablity, which frequently leads to complete malfunction. Diffusion of vapour and noxious elements inside the inner framework in the elements or PCB’s may result in long term disintegration of conductor paths and isolation levels. Each dangers may be avoided by proper handling and dried out storage.
The oxidation procedure – contact rust
Within an extremely-dry environment there is no rust. For corrosion to happen, two needs has to be met: there has to be a means of oxidation as well as a watery remedy, which functions as an electrolyte. The oxygen in the air types the method of oxidation, the vapour (moisture) the electrolyte. The critical restrict in which oxidation with o2 takes place is situated according to the metal or alloy at between 40 to 70 % RH. Which means that more than 8 grams of vapour per m³ must be existing.
Remedy 1: Dry Storage Cupboard
The absolute humidity in Dry Cabinets For PCB Storage lies at a heat 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 Barrier Hand bags
In humidity protection hand bags packed under vacuum with a rest pressure of ca. 6 mbar there will be among .1 and .06 g vapour for each m³. If the bags are filled with nitrogen, neither of the two a way of oxidation, nor an electrolyte can be purchased, and oxidation is extremely hard.
The Diffusion process
The vapour in the environment diffuses into hygroscopic components. The reason for this is the what are known as vapour stress – this implies the part pressure in the vapour which is present in the environment. The higher the vapour pressure, the quicker the components or PCB’s soak up moisture and with this the permissible processing time reduces.
All elements classes 2a to 5a according to the category of IPC/JEDEC J-STD020D absorb no moisture having a vapour stress of < 2.82. At this particular level they may be kept and processed indefinitely.
ProDry Storage Cabinets maintain over 24 hours typically a vapour stress of < 0.95 mbar reliably and effectively protecting from moisture diffusion. For Moisture Control Cabinets of over 5 many years, a combination of the two systems anmtvj suggested. The storage in humidity safety hand bags with nitrogen existing in a simple dried out storage cupboard with 5 % RH.