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Here we come back! How many times by opening the safe of the house we found ourselves in hand documents, cards or other completely fradic objects, muffes or oxidized by humidity.

This is a fairly common problem, due to the position of the safes, often collected on external walls perhaps addressed to the north or victims of the ascent humidity by the ground floor or underground.
The fact is that those important documents or that object to which we kept in a particular way pay the expenses.

How to deal with the problem of humidity.

Using dehydrating bags of silicagel or clay can offer a valid help to counteract the phenomena of condensation and accumulation of humidity, both in the smoke and in small armored wardrobes.

How many dehydrating sachets are necessary

How many dehydrating envelopes do you need? Indicatively for small safes it is advisable to use at least two 120 grams of silica gel or 250 grams of clay, however for safety it is preferable to exceed in the dosage, this is because the absorption capacity and the saturation time of the dehydrating sachets are directly connected to ‘relative humidity of the environment to be preserved, to the environmental temperature and the amount of air exchange with the external environment.
Whenever the safe is created, a new influx of humid air is created, the dehydrating sachets will be continually subjected to new work cycles that will lead them to rapid exhaustion.

Silica gel envelopes can be reused a number of times

Can I regenerate them and continue to use them? The best way to know when to regenerate the sachets is to check after a few weeks their weight, knowing that the maximum quantity that can be absorbed by an sachet is equal to about 20% of their initial weight. This means that when the dehydrating envelope has reached a weight of 20% more than the initial one has exhausted its absorption capacity and will therefore be regenerated or replaced.

But be careful, the sachets with Tyvek wrapping cannot be regenerated, it is also good to remember that despite being the silica gel an inert and non -dangerous material should not be used home ovens to regenerate it, to avoid any possible contact with food. The silica gel can be regenerated a certain number of times, over time the regenerative capacity will still be less and less.

Below is an example of the absorption capacity for standard dehydrating envelopes (silica white gel) and clay.

Sachet weightUnit NFHUnit DIN/MILHumidity quantity
120 g standard1/4 U424g c.ca
240 g standard1/2 U848g c.ca
250 g clay1/2 U848g c.ca

Envelopes with chromatic indicator

Another system for keeping humidity under control in the safe, weapons and small closed spaces closed is to use the silica gel envelopes indicating. These particular dehydrating envelopes contain a silica gel added with a totally non -toxic colorful component and free cobalt that changes color once the ability to absorb the sachets has been exhausted.

Silica Gel Sachets with Chromatic indicator to Protect the Safe from Moisture
Silica gel with color indicator completely harmless

The silica gel inside the envelopes will turn from yellow (operational envelope) to the blue once it is completely saturated, thus allowing to verify with a single look at the real operation of the dry envelopes. These envelopes are available in various formats, so that they can meet different needs.

Silica gel envelopes with chromatic indicator to protect the safe from moisture

A further precaution, which can be combined with the use of the silica gel in the safe, is to protect the paper documents and materials more more, which by their nature absorb every drop of humidity as sponges, inserting them in a rather thick closed plastic bag with some small sachets of silica gel such as 3 g.

proteggi documenti dall'umidità con il silica gel

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