• Why It Is Required ?
• Goods are very frequently subject to climatic stresses
while being transported. These occurs even during
storage and whiles containers are being packed . Climatic
stresses are caused by changing climatic conditions during
sea route and mainly while passing through climatic
• All the closed containers protect the cargo against
external climatic influences. Even though the boxes are
protected against the external influences, condensation
may occur inside.
• The relative humidity in the container is influenced
by the moisture that is bought in to on loading , and
any subsequent change in temperature.
• Sources of moisture are the enclosed air in the
container , the cargo itself, it’s packaging and the
• Some cargos emits a considerable amount of
moisture over a longer period , while some cargos
Humid air enters container when cargo is loaded and
enclosed with container cargo.
A container is a closed system with it’s own unique “
weather” inside. It differs from the warehouse in that the
variation in temperature is much greater. It is not unusual
to have containers wherein temperatures range from
freezing to 60-70C during the course of a single voyage.
• In a container a fast temperature change of 5-10C is often
enough to cause problems. Water will condense on the
coolest available surface, which is often the container
ceiling or walls. From there it may drip down onto the
cargo and cause damage – “container rain”. At other times
it condenses on the cargo, say on the inside of the pallet
wrap, – “cargo sweat”-, which is usually even more
Moisture damage is caused by:
• Condensation :
- In the ceiling and on the walls of the container.
- On the cargo ( Cargo Sweat)
• Prolonged periods of elevated humidity
• Condensation takes place on the coldest available surface,
often in container ceiling.
• Liners protect against container rain, but not against
• It is the Relative Humidity that matters.
• Even without any condensation, elevated humidity over a
period of time is sufficient to cause damage. Many metals
will corrode or discolour at a rather modest level of
humidity , 60-70%. At higher levels of humidity, 80%90%, moulds will grow, labels will peel and corrugated
boxes will start to soften.
• The Relative Humidity (RH) is a percentage measure of
holds as compared to the maximum amount of moisture
air at that temperature can hold. That means that
completely dry air has a RH of 0%. The RH can never be
more than 100%, or any excess moisture will rain out.
There is little danger of damage to anything if the RH is
below 50% or so
• The quantity of moisture that can be contain in cubic
meter depends on the Relative Humidity & Temperatures
• High Temperature = High quality of moisture in air.
• Low Temperature = Low quality of moisture in air.
• Warm air can hold more moisture than cold air, as
water to remain suspended in the air needs energy.
• That is why phenomenon of condensation occurs in
presence of high humidity ,when the temperature falls
down the moisture can’t remain suspended in the air.
When the temperature drops, the pressure in the container
drops, and air with ambient moisture content enters the
container (breathing-in). When the temperature goes up, the
opposite happens (breathing-out).
• Threat to your cargo due to moisture damage :
* Loose Carton & Peeling Labels
* Bed Smells
• You need Desiccant ?
• To control the moisture due to day to day breathing in
and breathing out .
• What to use the easily available Silica Gel ?
Advance Container Desiccant Like ?????
• Silica Gel Bags are designed for enclosed sealed
packaging where the humidity is limited (Static).
• Cargo Dry Pak is a container desiccant designed to
adsorbs moisture in large containers with a volume of
1170 CFT, 2385 CFT & 2690 CFT and the humidity is
( Dynamic) .
• In Silica Gel Bag active substance is SIO2 ( Silicon
Dioxide) and having a adsorption capacity of 30 % of it’s
• In Cargo Dry Pak active substance is Calcium Chloride ,
Bentonite Clay and Starch and having a adsorption
capacity of 100 % of it’s own weight.
• Silica Gel is having a weak adsorption capacity at Low
RH & High Temperature .
• Cargo Dry Pak is works better even at LOW RH & High
• Silica Gel contains DMF ( Dimethyl Fumarate ) biocide
which is banned in many European countries as per the
adopted decision 2009/251/EC .
• Packing of Silica Gel Bag material is fabric or non
woven , where the strength and the one way
permeability of moisture is doubtful.
• Cargo Dry Pak is DMF free and is USFDA approved
• container desiccant , hence ideal choice to be used in
pharmaceutical and food industries.
• Because of Low Adsorption Capacity more number
of Silica Gel Bag require to control the humidity
through out the voyage of the shipment .
• Cargo Dry Pak because of higher adsorption capacity
number of paks required will be less.
• Packing of Cargo Dry Pak 500 gm is Tyvek & 1500 gm
are Polyester Rayon Blend which offers higher
strength & one way permeability.
• Advantages By Using Cargo Dry Pak :
1. Assured protection from moisture .
2. Meets all the Environmental requirement of Developed
3. Less Number of Paks required , hence economical but
effective option .
4. Easy way of Installation .
5. No fear from rejection of material from overseas client
with respect to moisture .