Cable Drums and the Wood Packaging Mark: The Material Decides, Not the Shape

October 6, 2026

A cable drum is packaging and it is also the thing the customer keeps. It gets lifted, rolled, dropped, stored outside and eventually returned or scrapped, and all of that is a cable supplier’s problem. What surprises people is that it is also a phytosanitary question, and that a drum is named by name in the international standard that exists to stop tree pests crossing borders.

The consequence is that a drum specification contains a clause with nothing to do with cable. And the clause deciding whether that requirement applies at all is not about treatment, or marking, or destination. It is about what the drum is made of.

The drum is a regulated article, and the standard names it

The standard is ISPM 15, published by the Secretariat of the International Plant Protection Convention under the Food and Agriculture Organization, and its subject is wood packaging material moving in international trade. Its second section lists the forms covered, and cable drums are on the list: crates, boxes, packing cases, dunnage, pallets, cable drums and spools or reels. It adds that these can be present in almost any imported consignment, including consignments that would not normally be subject to phytosanitary inspection, which is a fair description of a drum of network cable shipping with an order no inspector would otherwise open.

Why regulate packaging at all? Wood from living or dead trees may carry pests, packaging is often made of raw wood not processed enough to remove or kill them, and the true origin of any piece is hard to determine. Rather than assess each piece, the standard describes measures every country can apply to all of it.

What puts a drum in scope: the material, not the shape

Here is the clause that decides most real cases. The standard’s scope covers wood packaging material made from raw wood, and excludes wood packaging made from wood processed in such a way that it is free from pests, giving plywood as the example. A later section sets out the exemptions in full.

The drum is	In scope?
Made of solid timber, sawn or otherwise worked but not processed into a composite	In scope. It must be treated and marked
Made entirely from thin wood, 6 mm or less in thickness	Exempt
Made wholly of processed wood material, such as plywood, particle board, oriented strand board or veneer, created using glue, heat or pressure, or a combination of them	Exempt
A wine or spirit barrel heated during manufacture	Exempt, on the standard’s own reasoning about that product

The practical reading is that two drums of identical size, shape, load rating and appearance can sit on opposite sides of the standard depending on how the timber was made rather than how the drum was built. A plywood drum is exempt. A solid timber drum of the same dimensions is in scope, must be treated to an approved schedule, and must carry the mark.

There is a further exemption for thin wood that matters at the edges. Wood packaging made entirely from wood 6 mm or less in thickness is exempt, and the explanatory material published alongside the standard discusses the awkward cases just above that line, where a component is thicker than 6 mm but still too small to carry a legible mark.

In scope and exempt drum materials

The two measures, and neither is optional

For material that is in scope, the standard requires two things together, and they are not alternatives to each other. The first is the use of debarked wood, with a stated tolerance for bark that remains. The second is the application of one of the approved treatments.

The bark tolerance is specific. Remaining bark is permitted where it is less than 3 cm in width regardless of length, or where it is greater than 3 cm in width with a total bark surface area on an individual piece of less than 50 square cm. Where methyl bromide or sulfuryl fluoride is used, bark must be removed before treatment because bark on the wood can affect efficacy; for heat treatment it may come off before or after. Where a dimension limit applies to a kind of heat treatment such as dielectric heating, any bark counts toward the dimension.

The approved treatments carry codes, and the codes are what appear on the mark.

Treatment code	Treatment
HT	Heat treatment
DH	Dielectric heating
MB	Methyl bromide
SF	Sulfuryl fluoride

The parameters differ, and so does the point in the wood where they are measured.

Treatment	Parameter	Where the measurement is taken
Heat treatment, HT	56 °C minimum, held for a minimum of 30 continuous minutes throughout the entire profile of the wood, including its core	At the location likely to be the coldest
Dielectric heating, DH	60 °C minimum, held for one continuous minute throughout the entire profile of the wood, including its surface	Usually the surface, which is where the coldest part sits under dielectric heating

Conventional steam heating, kiln drying and heat-enabled chemical pressure impregnation may all qualify as heat treatment provided the parameters are met.

The mark carries four things, and nothing else inside the border

Treatment only counts if it can be seen to have happened. The standard’s second annex specifies the mark, which has exactly four required components.

Component	What it is
The symbol	A dedicated design, which must resemble the standard’s examples closely, and which must be placed to the left of the codes
A country code	The ISO two-letter code for the country, separated by a hyphen from the next component
A producer or treatment provider code	A unique code assigned by the national plant protection organization, with the number and order of digits and letters also assigned by that authority
A treatment code	The abbreviation for the treatment applied, appearing after the combined country and provider codes, either on a separate line or separated by a hyphen

The application rules are as specific as the components. No other information may appear within the border of the mark, though a producer’s trademark or an authorizing body’s logo may be placed adjacent to it but outside. The mark must be legible, durable and not transferable, and placed where it will be visible when the packaging is in use, preferably on at least two opposite sides. It must not be hand drawn, and red and orange should be avoided because those colors are already used in the labeling of dangerous goods.

One requirement belongs in a procurement conversation almost verbatim. The size of the mark may vary, but it must be sufficient to be visible and legible to inspectors without the use of a visual aid. A mark that has to be examined closely is not a compliant mark, and a drum is a difficult surface for large characters, which is why the requirement is written around the inspector rather than in millimeters.

The four components of the mark

Reuse is free, repair and remanufacture are not

Reusable drums are normal in the cable trade, and the standard treats the three cases differently.

The drum’s history	What the standard requires
Treated, marked, and not repaired, remanufactured or otherwise altered	No re-treatment and no re-application of the mark, for the entire service life of the unit
Up to approximately one third of components removed and replaced	Only treated wood, or processed wood material, may be used for the repair, and each added component of treated wood must be individually marked
More than approximately one third of components replaced	The unit is remanufactured: previous marks must be permanently obliterated, the unit re-treated, and the mark applied anew

Two details in the middle row are easy to miss. The one-third figure is the line between repair and remanufacture, so a drum’s status depends on how much of it was replaced rather than on who replaced it. And where treated wood is used for a repair, the added components are marked individually, which produces a unit carrying more than one mark.

That is not itself a problem. The standard states that multiple marks on a single unit do not constitute non-compliance, while noting that they make origin harder to establish if pests are later found. Some authorities therefore require previous marks to be obliterated, the unit re-treated and the mark applied anew, and obliteration is specified as permanent, for example by covering with paint or grinding. Where a drum is partly solid timber and partly processed material, the unit is marked as a single unit, and it may be appropriate to put the mark on the processed components so that it lands somewhere visible and large enough.

Reuse, repair and remanufacture

What happens at the border when the mark is missing

An importing authority is not limited to refusing entry. Where wood packaging material does not carry the required mark, or where pests are found in a way that suggests the treatment was not effective, it may take emergency action.

Stage	What is available
First	Detention while the situation is addressed
Then	Removal of the non-compliant material; treatment; destruction or other secure disposal; or reshipment
Constraint	Authorities are asked to pursue the principle of minimal impact, and to distinguish between the consignment traded and the wood packaging accompanying it
Note	The treatment used in an emergency need not be one approved in the standard

That third row is what gives a drum a chance of being handled separately from the cable on it. The standard also expects the exporting country, or the manufacturing country, to be notified when live pests are found, and observes that with packaging reused as often as it is, the fault may lie where the unit was produced, repaired or remanufactured rather than where it was exported from.

The mark replaces a certificate, and a side deal does not buy the mark

Two points about status are easy to state and hard to guess.

The mark removes a document rather than adding one. The standard states that applying it renders the use of a phytosanitary certificate unnecessary, because the mark itself indicates that the internationally accepted measures have been applied, and that authorities should accept it as the basis for authorizing entry without further specific requirements, any requirement beyond an approved measure needing technical justification. A buyer asking for a phytosanitary certificate per drum is asking for a document the mark is designed to make unnecessary.

The second point concerns bilateral arrangements. Authorities may agree to accept measures other than those listed, but where they do, the mark must not be used unless all the requirements of the standard have been met. An agreed alternative does not come with the mark attached.

What to put in the drum specification

Item	Why it belongs in the specification
The drum material, named precisely	It is what decides whether the standard applies at all. Plywood, particle board, oriented strand board and veneer are exempt; solid timber is not
The treatment and its code	The code is what appears in the mark, and HT, DH, MB and SF are different schedules
The bark condition	The tolerance is conditional, and for two of the treatments the bark must come off before treatment rather than after
The mark’s placement	Visible when the drum is in use, preferably on two opposite sides, and not inside the border with anything else
Legibility at inspection distance	The requirement is stated in terms of an inspector’s unaided eye, and a drum is a difficult surface
Whether the drum is new, repaired or remanufactured	The three cases carry different obligations, and a repaired drum may arrive carrying more than one mark
The composite makeup, if the drum mixes materials	A mixed unit is treated as one unit for marking, and the mark’s location has to be planned

FAQ

Does my cable drum need the wood packaging mark?

Only if it is in scope. The standard covers wood packaging material made from raw wood, and it names cable drums and spools or reels among the forms covered. It exempts packaging made entirely from wood 6 mm or less in thickness, and packaging made wholly of processed wood material such as plywood, particle board, oriented strand board or veneer. A plywood drum is exempt; a solid timber drum of the same size is not.

What do the letters on the mark mean?

Three of the four components carry information. The country code is the ISO two-letter code, the producer or treatment provider code is assigned by the national plant protection organization, and the treatment code is the abbreviation for the treatment used: HT for heat treatment, DH for dielectric heating, MB for methyl bromide, or SF for sulfuryl fluoride. The fourth component is the symbol itself, which is placed to the left of the codes.

Conclusion

A cable drum is a regulated article under an international phytosanitary standard, named there alongside pallets and dunnage. The first question it raises is not about treatment, because the standard’s exemption clause comes before its treatment clause. Whether a drum is in scope is decided by its material, and a plywood drum and a solid timber drum of the same size sit on different sides of that line.

Once a drum is in scope the requirements are concrete: debarked wood with a stated tolerance, one approved treatment to a stated schedule, and a mark with four components and nothing else inside its border, legible to an inspector without help. Reuse is free, repair and remanufacture are not, and the mark replaces a certificate rather than adding to the paperwork.

The clause a specification usually forgets is the first one.

Cable drums and export packing

ZONG Cable builds cable and states, on the packing list and before the order, what the drum is made of, which treatment it carries and where the mark sits, so the packaging question is settled at the specification stage rather than at the port. Send us the drum material, the destination and whether the drums are new or reusable, and we will set out the construction and the packing that meet the requirement. The range sits under cable, drum and packing options are described under packaging solutions, the specification-to-shipment process is covered in the guide to custom cable projects, the compliance position is listed under certifications, batch evidence travels with the guide to test and inspection, and private-label marking and packing are fixed under OEM support.

Sources

International Plant Protection Convention, ISPM 15, Regulation of wood packaging material in international trade, adopted 2018, published 2019, including Annex 1 Approved treatments associated with wood packaging material (2018) and Annex 2 The mark and its application (2018). Read directly for this article: the Scope statement that the standard describes phytosanitary measures that reduce the risk of introduction and spread of quarantine pests associated with the movement in international trade of wood packaging material made from raw wood, that wood packaging material covered includes dunnage, and that it excludes wood packaging made from wood processed in such a way that it is free from pests, giving plywood as the example; section 1 Basis for Regulation, including the statements that wood from living or dead trees may be infested, that wood packaging material is frequently made of raw wood that may not have undergone sufficient processing or treatment and therefore remains a pathway, that dunnage in particular presents a high risk, that wood packaging material is very often reused, repaired or remanufactured, and that the true origin of any piece is difficult to determine so its phytosanitary status cannot easily be ascertained; section 2 Regulated Wood Packaging Material, naming crates, boxes, packing cases, dunnage, pallets, cable drums and spools or reels, and stating that these can be present in almost any imported consignment including consignments that would not normally be subject to phytosanitary inspection; section 2.1 Exemptions, listing wood packaging material made entirely from thin wood 6 mm or less in thickness, wood packaging made wholly of processed wood material such as plywood, particle board, oriented strand board or veneer created using glue, heat or pressure or a combination of them, and barrels for wine and spirit heated during manufacture, together with the note that not all types of gift boxes or barrels are constructed to be pest free and that certain types may therefore fall within scope; the Outline of Requirements statement that the approved measures consist of the use of debarked wood with a specified tolerance for remaining bark and the application of approved treatments; section 3.1 Approved phytosanitary measures, including that the application of the mark renders the use of a phytosanitary certificate unnecessary, that the mark consists of a dedicated symbol used in conjunction with codes identifying the specific country, the responsible producer or treatment provider and the treatment applied, that authorities should accept the mark as the basis for authorizing entry without further specific requirements, and that required measures beyond an approved measure require technical justification; section 3.3 Alternative bilateral arrangements, including that the mark must not be used unless all requirements of the standard have been met; section 4.3.1 Reuse, stating that a unit treated and marked and not repaired, remanufactured or otherwise altered does not require re-treatment or re-application of the mark throughout its service life; section 4.3.2 Repaired wood packaging material, defining repair as up to approximately one third of components removed and replaced, requiring that only wood treated in accordance with the standard or processed wood material be used, requiring each added component of treated wood to be individually marked, noting the difficulty multiple marks create in determining origin and recommending that authorities limit the number of marks on a unit, and permitting authorities to require previous marks to be obliterated with the unit re-treated and re-marked; section 4.3.3 Remanufactured wood packaging material, defining remanufacture as more than approximately one third of components replaced and requiring previous marks to be permanently obliterated, the unit to be re-treated and the mark applied anew; section 4.5 Procedures upon import, including the importance of cooperation with customs organizations; section 4.6 Phytosanitary measures for non-compliance at point of entry, including that where wood packaging material does not carry the required mark or pests are detected emergency action may be taken in the form of detention and then removal of non-compliant material, treatment, destruction or other secure disposal or reshipment, that the principle of minimal impact should be pursued distinguishing between the consignment traded and the accompanying wood packaging material, that the treatment used need not be a treatment approved in the standard, that the exporting or manufacturing country should be notified where live pests are found, and that the presence of multiple marks on a single unit of wood packaging does not constitute non-compliance; the bark tolerance specifying bark less than 3 cm in width regardless of length, or greater than 3 cm in width with a total surface area of an individual piece of bark less than 50 square cm, and the differing timing of bark removal for methyl bromide and sulfuryl fluoride on the one hand and heat treatment on the other, with bark included in the dimension measurement where a dimension limitation applies to a type of heat treatment such as dielectric heating; the heat treatment requirement of a minimum temperature of 56 degrees Celsius for a minimum duration of 30 continuous minutes throughout the entire profile of the wood including its core, with monitoring at the location likely to be the coldest and the note that for dielectric heating the coldest part is usually the surface; the dielectric heating requirement of a minimum temperature of 60 degrees Celsius for one continuous minute throughout the entire profile of the wood including its surface; Annex 2, listing the four required components of the mark as the symbol, a country code, a producer or treatment provider code and a treatment code using the appropriate abbreviation according to Annex 1 among HT, DH, MB or SF, requiring the symbol to be presented to the left of the other components and to resemble closely the examples illustrated, requiring the country code to be the ISO two-letter code separated by a hyphen from the producer or treatment provider code, describing the producer or treatment provider code as a unique code assigned by the national plant protection organization with the number and order of digits and letters assigned by that authority, and requiring the treatment code to appear after the combined codes either on a separate line or separated by a hyphen; the treatment code table giving HT for heat treatment, DH for dielectric heating, MB for methyl bromide and SF for sulfuryl fluoride; the application requirements that the size, font types and position may vary but the size must be sufficient to be both visible and legible to inspectors without the use of a visual aid, that the mark must be rectangular or square contained within a border line with a vertical line separating the symbol from the code components, that small gaps may be present to facilitate stencilling, that no other information shall be contained within the border although additional marks may be provided adjacent to but outside it, that the mark must be legible, durable and not transferable, and placed in a location visible when the wood packaging is in use preferably on at least two opposite sides, that the mark must not be hand drawn, and that the use of red or orange should be avoided because these colors are used in the labeling of dangerous goods; the treatment of composite units as a single unit for marking purposes with the allowance for the mark to appear on the processed wood components of a composite; and the note that at import countries should accept previously produced wood packaging material carrying a mark consistent with earlier versions of the standard. https://www.ippc.int/static/media/files/publication/en/2019/02/ISPM_15_2018_En_WoodPackaging_Post-CPM13_Rev_Annex1and2_Fixed_2019-02-01.pdf
IPPC, Explanatory document for ISPM 15, read for the discussion of wood just above the thin wood threshold, where components may be thicker than 6 mm in width but still too small to carry the certification mark prescribed in Annex 2 legibly, and for the note that authorities may wish to consider greater discretion in regulating wood that is only slightly larger than 6 mm. https://www.ippc.int/static/media/files/publication/en/2017/02/ISPM_15_ED_En_2017-02-10.pdf
ZONG Cable range. https://zh-zong.com/cable/