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Desiccants available

Desiccants available on the market

On the market, many kinds of desiccant are available; there is oranges silicagels, "brown silcagel" and molecular sieves (or ZR gel). Most of the suppleirs of those kind of desiccant argue that this kind of products is safe for human and environement. What are the facts.

Following the last information of European Commission, except the blue (Cobalt Dichloride), no one of them allow desiccant breathers to work correctly. ECHA is the official department of European Commission, in charge of the application of European regulations and directives concerning chemical substances: prioritisation_cobalt_dichloride
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GOOD NEWS for DESCASE breathers end users and for DESCASE products. Dated June 15th 2011, ECHA (European Chemicals Agency, official department of CEE) recognises et confirms:
1. Dichlorure de Cobalt, used in DESCASE breathers as humidity indicator, is the only efficient colour additive that can be used.
2. Use of other chemical colour additive, as do few other is not technically suitable (alternatives to cobalt dichloride - e;g; other metal salts, such as iron or copper salts, as proposed by france did not allow the same range of humidity indication and therefore these substances were not considered to be technically suitable).
See page 7: ECHA Background of Cobalt Dichloride
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In January 2011, Environmental and Health department of Canada established that:elemental cobalt, cobalt chloride, and cobalt sulfate are not entering the environment in a quantity or concentration or under conditions that constitute or may constitute a danger in Canada to human life or health.
See page 43 & 44:Cobalt Health Environnement Canada
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General data on desiccants
Bentonite Clay
-Absorbs 25% of its weight in moisture
-High dust yield, requiring expensive packaging to minimize dust
Molecular Sieve
-Absorbs 22% of its weight in moisture
-Difficult clean up packaging damaged
Silica Gel -Best Choice
-Absorbs 40% of weight in moisture
-Absorb moisture up to 220°F (104°C) -most efficient up to 100°F (38°C)
-Yields practically no dust particles, making it a good choice for being packaged with dry food or electronic items
-Several chemical options to indicate moisture with colour.

For further, Please read those links.
» http://www.articlesbase.com/science-articles/comparing-commercial-desiccants-silica-gel-clay-and-molecular-sieve-948261.html
Comparison
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Orange additif change of colour at 6% stauration of the desiccant, see page 1 (Third column) and the curve page 2 (It means that silicagel with orange additive must be replaced more frequently that when it use blue additive): Orange additif
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Oranges silicagels
The main product use an additive, for abour 5%, that manufacturers call Iron Salts: SORBSIL C "Chameleon", Trockenperlen orange.
An other one use an additive called Phenolphthalein
An other one use, for 0,9%, an additive that is Gentian Violet (or Crystal Violet)
» Details on oranges silicagels

Silicagel called "Brown Silicagel" & Molecular sieves:
» Details on "Brown silicagel" & ZR gel

What about Cobalt Chloride used, at 0,5% to treat the silicagel use by DESCASE?
» Details on blue silicagel

Dielectric and industrial oils.
» Classification for industrial oils