Kapok seed oil [German version]

Table of contents

Product information
  Container transport
  Cargo securing

Risk factors and loss prevention:
Temperature Odor
Humidity/Moisture Contamination
Ventilation Mechanical influences
Biotic activity Toxicity / Hazards to health
Gases Shrinkage/Shortage
Self-heating / Spontaneous combustion Insect infestation / Diseases

Product information

Product name

German Kapoksaatöl, Kapoköl
English Kapok seed oil, kapok oil
French Huile de kapok
Spanish Aceite de kapok
Scientific Ceiba pentandra
CN/HS number * 1515 90 ff.

(* EU Combined Nomenclature/Harmonized System)

Product description

„Oils“ is a collective term for more or less viscous, generally organic-chemical liquids. Depending on their chemical composition, a distinction may be drawn between fatty, essential, mineral and silicone oils. Fatty oils include liquid, semisolid and solid products of vegetable and animal origin. They are also known as sweet oils.

Kapok oil is of vegetable origin and is obtained from the seeds of the kapok tree. It is a yellow oil with a pleasant, mild odor and taste.

Kapok oil is the most sensitive of all the vegetable oils. It has similar characteristics to cottonseed oil.

Quality / Duration of storage

The acid value of an oil may be used as a measure of quality. However, the acid value of the oil must not be too high, as this denotes an excessively high content of free fatty acids, which causes the oil to turn sour. Discoloration may also occur. Kapok oil should have an acid value of at most 2.3%.

Oils and fats spoil by readily becoming rancid. Rancidity is promoted by light, atmospheric oxygen and moisture and leads to changes in odor and taste. Thus, the tanks and barrels must be filled as full as possible, taking into consideration the coefficient of cubic expansion (see Density), so that as little ullage space as possible is left above the cargo. Do not load rancid oil, since it does not meet quality requirements.

Do not accept for loading kapok oil contaminated by ferrous and rust particles or by seawater.

Maximum duration of storage is as follows:

Temperature Max. duration of storage Source
15.6°C 6 months [1]

Intended use

Kapok oil is used as an edible oil and in soap production.

Countries of origin

This Table shows only a selection of the most important countries of origin and should not be thought of as exhaustive.

Asia Singapore, India, Malaysia

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This oil is mainly transported in tanks, and only rarely in barrels.

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Liquid cargo
Symbol, general cargo

General cargo


Means of transport

Ship, truck, railroad

Container transport

Heatable tank containers

Cargo handling

To be able to pump the oil out of the tanks, it must be at the required pumping temperature. This is only possible, however, if the oil has been kept liquid during the voyage (above a minimum temperature). Loading, travel and pumping temperatures must be precisely complied with, since any change in consistency which occurs during transport may prove irreversible.

If the oil solidifies in the tanks, it cannot be liquefied again even by forced heating. In the vicinity of the heating coils, the oil melts, scorches, discolors and becomes rancid.

Pumping out may be difficult in cold weather. The oil may cool too rapidly in the long lines and solid deposits form on the outer walls, which cannot be pumped out and prevent the still liquid cargo from reaching the suction valve. This problem can be solved by appropriate heating or insulation of the lines.

Where the oil is packaged in barrels, the latter have to be handled with appropriate care. Damaged barrels quickly lead to oil leakage and thus to loss of volume or to damage to other parts of the cargo.


0.920 – 0.923 cm3 [1]
0.915 cm3 [11]

All fats and oils have a particular density (approx. 0.9 g/cm3). With a rise in temperature, however, density diminishes, thereby leading at the same time to an increase in volume. This behavior is described by the coefficient of cubic expansion and is known as thermal dilatation.

The coefficient of cubic expansion amounts to: g = approx. 0.00072°C-1

As a rule of thumb, oils may be expected to increase in volume by 1% of their total volume for each 14°C temperature increase. In particular in the case of oils requiring heating, such as kapok oil, the ullage space must be calculated accordingly.

When filling the barrels or tanks, attention must however be paid to the expansion behavior of the cargo in the event of a rise in temperature (risk of bursting of barrels).

Stowage space requirements

Special tank


Not applicable to liquid cargoes in tanks

Cargo securing

In the case of liquid cargoes, it is important for the ullage space above the cargo to be as small as possible, so that only slight movement of the cargo is possible. Movement in liquid cargoes may have a negative effect on the stability of the means of transport (e.g. during cornering in the case of trucks and trains or when ships roll and pitch).

Barrels have to be secured in such a way that they cannot slip in the hold or on the loading area and suffer damage.

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Risk factors and loss prevention

RF Temperature

Kapok oil requires particular temperature conditions (SC II) (storage climate conditions).

A written heating order must be obtained from the consignor before loading is begun. This order must always be complied with during the entire transport chain.

The solidification temperature is of considerable significance in the transport of fatty oils and fats. They must remain liquid during loading, during the voyage and during unloading. Chill haze (separation) begins if cooling causes the temperature of the oil to approach solidification point, the oil becoming ointment-like and finally solid, such that it is no longer pumpable.

Separation and the associated change in consistency from liquid to solid occurs more readily upon cooling, the higher is the solidification point.

The oils must only be heated by a few °C per day, otherwise the risk of rancidity and other negative changes arises.

The following Table merely constitutes a rough estimate of appropriate temperature ranges. Temperatures may deviate from these values, depending on the particular transport conditions.

Designation Temperature range Source
Loading temperature 24°C [1]
Favorable travel temperature 15.6°C [1]
Solidification temperature 13 – -8°C [1]
Pumping temperature 24 – 29°C [1]

The travel temperature must be complied with as far as possible during transport, to minimize oxidation processes. Sometimes, consignors require that the temperature be kept strictly at 15.6°C.

Towards the end of the voyage, the temperature of the oil must be raised in stages to the pumping temperature of 24 – 29°C. If the temperature rises, discoloration due to oxidation and polymerization must be expected. If other oils with higher pumping temperatures are to be prepared in the vicinity of the kapok oil tank, heating of the other types of oil must only be continued after unloading of the kapok oil, since the kapok oil spoils very rapidly at higher temperatures (> 30°C).

Separation sometimes occurs even at normal ambient temperature, but at any rate at temperatures below 13°C.

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RF Humidity/Moisture

Fats and fatty oils are insoluble in water. However, contact with water may give rise to soluble lower fatty acids and glycerol, which cause rancidity together with changes in color (yellow to brown), odor and taste as well as gelling and thickening. For this reason, the tanks must be absolutely dry after cleaning.

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RF Ventilation

Ventilation must not be carried out under any circumstances, as it would supply fresh oxygen to the cargo, which would promote oxidation processes and premature rancidity.

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RF Biotic activity

Kapok seed oil displays 3rd order biotic activity.

It belongs to the class of goods in which respiration processes are suspended, but in which biochemical, microbial and other decomposition processes still proceed.

Care of the cargo during the voyage must be aimed at keeping decomposition processes to a low level.

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RF Gases

Before anybody enters an empty tank, it must be ventilated and a gas measurement carried out. Oxidation processes may lead to a life-threatening shortage of O2.

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RF Self-heating / Spontaneous combustion

The oil may ignite spontaneously in conjunction with sawdust or material residues.

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RF Odor

Active behavior Kapok oil has a pleasant, mild odor.
Passive behavior Tanks and barrels must always be odor-free, since there is a risk that quality will be diminished in particular where the previous cargo had a strong odor.

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RF Contamination

Active behavior Leaking oil leads to massive contamination and may make whole cargoes unusable.

Of considerable significance with regard to tank cleaning is the iodine value, which is a measure of how strong a tendency the oil has to oxidation and thus to drying. Drying is particularly detrimental to tank cleaning, as the oil/fat sticks to the walls and can be removed only with difficulty. On the basis of drying capacity, oils are divided into nondrying, semidrying and drying oils.

With an iodine value of 85 – 100, kapok oil is a nondrying oil, which means that it does not dry significantly on contact with atmospheric oxygen and the tanks are easily cleaned.
Passive behavior Kapok oil is sensitive to contamination by ferrous and rust particles and water (especially seawater).

The tanks or barrels must be clean and in a thoroughly hygienic condition before filling. Kapok seed oil necessitates particularly careful tank cleaning, since it spoils immediately on even slight contact with other oils, sea- and fresh water and other substances.

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RF Mechanical influences

In the case of transport in barrels, extreme mechanical stresses, such as dropping, tipping over or bumping, may lead to breakage of the barrels and thus to leakage.

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RF Toxicity / Hazards to health

Before anybody enters a tank, it must be ventilated and a gas measurement carried out. Oxidation processes may lead to a life-threatening shortage of O2.

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RF Shrinkage/Shortage

Where this oil is packaged in barrels, weight loss from leakage is always to be expected.

Losses due to adhesion of the cargo to the tank walls are minimal (< 0.3%), because kapok oil is a nondrying oil.

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RF Insect infestation / Diseases

No risk.

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