Humidity indicators – for reliable control

Small, practical and cost-effective: The moisture indicators are made from special absorbent paper, certain parts of which are impregnated with cobalt (II)-chloride solutions of varying concentrations. The colouring from blue to purple to pink shows the change in relative humidity in the ambient air. Depending on the indicator’s design, the colours can change in reverse sequence once the air humidity decreases (reversible indicators). Cobalt-free and irreversible humidity indicators are also available.

Indicator accuracy

The humidity indicators are small, simply designed, and inexpensive, so you cannot compare their measurement accuracy with that of expensive electronic instruments. At a test temperature of 20°C (+/– 2°C), the permitted tolerance is +/– 5% relative humidity.
This means the indicators are compliant with the German Federal Armed Forces technical delivery conditions (“Technische Lieferbedingungen”) TL 6685-0003, version 6 (September 2018).

The deviations are approximately 2.5% relative humidity per 5°C above and below 20°C.

Export information

When exporting goods to destinations with extreme climates, please note that the colour changes later in temperatures above 20°C, and earlier in temperatures below 20°C.

Application

The humidity indicators are either placed inside the packaging or are integrated into window panels.

When proper export packaging, including desiccants, is used at normal temperatures, the relative humidity quickly drops below 20%. The moisture indicators’ 30%  display should thus be blue.
If this is not the case after 2-3 days, check the packaging for a leak, insufficient desiccant or excessively moist packaged goods.

  

The indicators’ colour reaction can, however, also be delayed, e.g. by excessively low packaging temperatures in winter, a lack of air circulation between the indicator and desiccant, or unsuitable films.

 

Reversible Humidity Indicators according to TL 6685-0003

Indicated RH

Supply-Number

Dimensions

Language

Packaging

8 % relative humidity  60 x 35 mmE / D / FBundles of 250 pcs.
8% relative humidity cobalt-free  60 x 35 mmE / D / FBundles of 250 pcs.
8 % relative humidity self-adhesive, cobalt-free  49 x 19 mmE / D / F / I4.000 pcs. on a roll
40 % relative humidity self-adhesive  27 x 20 mmE / D800 pcs. on a roll
5/10/15 % relative humidity  50 x 75 mmE125 pcs. in tin
10-60 % relative humidity 120 x 40 mmEE200 pcs. in tin
30-50 % relative humidity6685-00-752-8240 50 x 75 mmE / D125 pcs. in  tin
20-80 % relative humidity6685-12-194-4969 50 x 160 mmDBundles of 100 pcs

 

Irreversible Humidity Indicator

Indicated RH

Supply-Number

Dimensions

Language

Packaging

50-90 % relative humidity 76 x 113 mmE50 pcs. in  tin

 

Screw-in Humidity Indicators according to TL 6685-0003

Indicated RH

Supply-Number

Dimensions

Language

Packaging

30-50 % relative humidity6685-12-181-2445Ø 10 cmE / D / F12 pcs. in PE
48 pcs. in a box
20-80 % relative humidity6685-12-337-1231Ø 10 cmE / D / F10 pcs. in PE
40 pcs. in a box
40-80% relative humidity Ø 10 cmE / D / F12 pcs. in PE
48 pcs. in a box
30-50% relative humidity6885-12-166-1928Ø 3/4 "D125 pcs. in tin

Info

Consulting | Service | High availability

TROPACK provides desiccant bags, desiccant cartridges, desiccant capsules and aluminium-composite film for a wide range of applications.
Custom designs tailored to your specifications are also available. Contact us for advice:

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TROPACK – you can count on us

TROPACK products comply with the highest quality standards according to DIN 55473 (12/2015). Our desiccants meet the relevant requirements established by the European Union (e.g. EC 1935/2004) and the US Food & Drug Administration FDA (e.g. 21 CFR part 175/part 177).

TROPACK quality standards are regularly verified in the form of DIN 55473 and ISO 9001 certifications.That’s something industry, the retail market and consumers alike can count on. TROPACK desiccants are food-safe, contaminant-free, odourless and renewable. (We expressly refrain from using dimethyl fumarate (DMF)!)

We’ll be glad to answer any questions you may have!

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