Our dry cabinets And dry storage options deliver a low (<0.5%), managed degree of moisture. Moisture absorbing components including electronic elements, circuit panels, nano fibers, contact lenses, lab examples along with other vulnerable components are maintained dry and free of water ingress. The dehumidification to lower than .5% RH is eligible Low Humidity Cabinets not just for limitless secure storage, but additionally indicates they can safely remove moisture, thus resetting floor life without having oxidation, even at ambient temperatures.
Solutions for your storage space of electronic components and compositions to prevent two of the biggest defect triggers: Oxidation and Diffusion.
The storage of electronic components and compositions is problematic, and increasingly so as the result of two issues.
As a result of rapid changes in packaging design and material, many companies wind up required to purchase additional amounts of components to be able to shield up against the effect of component obsolescence on the final product designs. This in turn produces a concern of long term inventory storage
Product lifecycles have grown to be really brief with new designs being released faster than before. Nevertheless, numerous producers, like vehicle suppliers, should guarantee the accessibility to replacement components such as PCBs for approximately ten years. This situation also necessitates the advance purchase and prolonged storage of components and materials. Additional complicating the problem is that most components cannot be stored for longer than 10 years without special dealing with methods.
Element mini-cracking as a result of the intake and rapid release of dampness. The greatest danger posed is humidity. This is the reason for two of the biggest problem triggers: Oxidation and Diffusion.
Due to surface oxidation, components and PCB’s can are afflicted by reduced solderablity, which often brings about total failure. Diffusion of vapour and noxious elements within the inner structure of the components or PCB’s may result in long-term disintegration of conductor paths and isolation levels. Both risks can be prevented by proper handling and dry storage.
The oxidation procedure – contact rust
In an ultra-dry environment there is not any corrosion. For rust to happen, two demands should be met: there has to be a way of oxidation along with a watering solution, which works as being an electrolyte. The oxygen within the atmosphere forms the means of oxidation, the vapour (moisture) the electrolyte. The critical restrict at which oxidation with o2 occurs is situated according to the steel or alloy at between 40 to 70 % RH. Which means that a lot more than 8 gr of vapour for each m³ should be present.
Remedy 1: Dried out Storage space Cabinet
The complete humidity in Dry Cabinets For PCB Storage lies with 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 Bags
In moisture safety bags loaded below vacuum using a relaxation pressure of ca. 6 mbar you will have among .1 and .06 g vapour for each m³. Once the hand bags are filled with nitrogen, neither a method of oxidation, nor an electrolyte can be purchased, and oxidation is extremely hard.
The Diffusion procedure
The vapour inside the environment diffuses into hygroscopic materials. The reason for this is the so named vapour stress – this implies the part stress of the vapour which can be present in the environment. The greater the vapour pressure, the faster the components or PCB’s absorb moisture and with this the permissible processing time reduces.
All elements classes 2a to 5a as outlined by the classification of IPC/JEDEC J-STD020D absorb no dampness having a vapour pressure of < 2.82. At this particular level they may be stored and processed indefinitely.
ProDry Storage space Cupboards maintain more than round the clock normally a vapour stress of < 0.95 mbar reliably and effectively protecting from moisture diffusion. For Moisture Control Cabinets of more than 5 years, a mixture of the 2 techniques anmtvj recommended. The storage space in moisture protection bags with nitrogen existing inside a simple dried out storage space cupboard with 5 % RH.