ISPM 15 and Wood Packaging: Why Corrugated Pallets Are Gaining Ground

International Standard for Phytosanitary Measures No. 15 — commonly known as ISPM 15 — governs the treatment and marking of wood packaging materials used in international trade. The regulation exists for a sound biological reason: untreated wood can carry invasive insects and plant diseases that devastate forests and agriculture when introduced to new regions. The emerald ash borer, the Asian longhorned beetle, and pine wood nematode are all examples of destructive organisms that have spread through wood packaging in international commerce.

For companies that export products using wooden pallets, crates, or dunnage, ISPM 15 compliance is a non-negotiable requirement for clearing customs in virtually every trading nation. And for the corrugated packaging industry, ISPM 15 has created a growing market opportunity: paper-based pallets and shipping platforms that are exempt from the regulation entirely.

What ISPM 15 Requires

Scope

ISPM 15 applies to all wood packaging materials (WPM) made from raw or non-manufactured wood that could harbor pests. This includes:

Pallets (the most common affected item)
Crates and boxes made from solid wood
Dunnage (wood used to brace or support cargo)
Skids and load boards
Wood collars and frames

What Is Exempt

ISPM 15 does not apply to:

Manufactured wood products: Plywood, particle board, oriented strand board (OSB), and similar processed wood materials are exempt because the manufacturing process eliminates pest risk.
Wood thinner than 6mm: Thin wood materials are considered too small to harbor regulated pests.
Paper and corrugated products: All paper-based packaging materials — including corrugated boxes, corrugated pallets, and paper-based shipping platforms — are completely exempt from ISPM 15 because the pulping and papermaking process eliminates any phytosanitary risk.

This exemption is the key point for the corrugated industry. Any shipping platform made entirely from paper-based materials requires no treatment, no marking, and no phytosanitary inspection for international shipment.

Treatment Requirements

For wood packaging that falls under ISPM 15, the regulation requires one of two approved treatments:

Heat treatment (HT). The wood must be heated to a minimum core temperature of 56 degrees Celsius (132.8 degrees Fahrenheit) for a minimum of 30 minutes. This is the most widely used treatment method.

Dielectric heating (DH). Microwave or radio frequency treatment that achieves 60 degrees Celsius for 1 minute throughout the wood profile.

Methyl bromide fumigation was previously an approved treatment but has been phased out in most countries due to its ozone-depleting properties.

Marking Requirements

Treated wood packaging must bear the ISPM 15 mark — a rectangular stamp showing the IPPC logo, the country code, producer number, and treatment code (HT or DH). The mark must be permanent and legible without the use of red or orange ink (to avoid confusion with hazard markings).

The Compliance Burden

Cost of ISPM 15 Compliance

For exporters using wooden pallets, ISPM 15 compliance adds cost at several points.

Treatment cost. Heat treatment of wooden pallets typically adds $2 to $5 per pallet, depending on volume and provider. This cost is ongoing for every pallet used in international shipment.

Certification and marking. Pallet suppliers must be certified by their national plant protection organization (APHIS in the U.S.), maintain treatment records, and properly mark every pallet. These administrative costs are passed through to customers.

Inspection and documentation. Customs authorities in importing countries may inspect wood packaging for proper ISPM 15 marks. Non-compliant shipments can be refused entry, quarantined, or required to undergo treatment at the port — causing costly delays and additional treatment fees.

Replacement of non-compliant pallets. If wood pallets are damaged during shipping and lose their ISPM 15 marks, or if marks become illegible, the pallets may be considered non-compliant in the destination country. This can happen with surprising frequency in rough handling environments.

The Risk of Non-Compliance

The consequences of shipping on non-compliant wood packaging can be severe:

Cargo hold at port: Customs authorities can hold entire container loads for inspection, causing delivery delays of days to weeks.
Forced treatment at destination: The shipper may be required to pay for treatment of the wood packaging at the port, at significantly higher costs than pre-shipment treatment.
Cargo rejection: In the worst case, cargo can be refused entry to the country entirely, requiring re-export at the shipper's expense.
Fines and penalties: Some countries impose fines on importers who present non-compliant wood packaging.

These risks — and the administrative burden of ongoing compliance — are driving many exporters to evaluate alternatives to traditional wood pallets.

Corrugated Pallets: The ISPM 15-Exempt Alternative

How Corrugated Pallets Work

Corrugated pallets are shipping platforms made entirely from corrugated board, heavy-duty paperboard, or combinations of paper-based materials. They are designed to support pallet loads of varying weights and are available in standard sizes (including 48 x 40 GMA dimensions).

Modern corrugated pallets have evolved significantly from early versions that were limited to light-duty applications. Current designs from manufacturers like Conitex Sonoco, Tri-Wall, Corrugated Pallets Inc., and others can support static loads of 5,000 to over 30,000 pounds and dynamic loads of 2,500 to 10,000 pounds, depending on the design and configuration.

Key Design Approaches

Honeycomb core pallets. Honeycomb paper core sandwiched between corrugated or solid board facings creates a pallet with excellent strength-to-weight ratio. Honeycomb pallets are among the lightest options, typically weighing 5 to 15 pounds compared to 30 to 50 pounds for a wooden GMA pallet.

Multi-layered corrugated pallets. Multiple layers of heavy-duty corrugated board, laminated and configured with structural ribs or columns, create a load-bearing platform. These pallets are economical to produce and adequate for medium-duty applications.

Molded fiber pallets. Pallets formed from molded pulp (similar to the process used for egg cartons) offer another paper-based, ISPM 15-exempt option. These are less common than corrugated pallets but are used in some specialized applications.

Advantages of Corrugated Pallets

ISPM 15 exemption. The primary advantage for international shippers. No treatment, no marking, no inspection risk, no compliance cost. The pallet can ship to any country without phytosanitary documentation.

Weight savings. A corrugated pallet typically weighs 60 to 80 percent less than an equivalent wooden pallet. For air freight, where charges are based on weight, this difference is substantial. For ocean freight, weight savings reduce fuel costs and allow more cargo per container. The weight difference also reduces inbound freight costs for the pallets themselves.

Recyclability. Corrugated pallets are recyclable in standard OCC recycling streams, just like corrugated boxes. At the destination, the receiver can recycle the pallet with their other corrugated waste rather than managing wood pallet returns or disposal.

No fastener contamination. Wooden pallets use nails and staples that can damage products, injure workers, and contaminate recycling streams. Corrugated pallets are fastener-free, eliminating these risks.

Consistent quality. Manufactured corrugated pallets are dimensionally consistent, with flat, smooth surfaces that work well with automated handling equipment. Wooden pallets vary in quality, especially recycled ones, and rough surfaces can damage products and packaging.

Customizable. Corrugated pallets can be produced in any size, not just standard pallet dimensions. For non-standard products or shipping configurations, custom-sized corrugated pallets can optimize space utilization in ways that standard wooden pallets cannot.

Limitations of Corrugated Pallets

Moisture sensitivity. Like all corrugated products, paper-based pallets lose strength when wet. They are not suitable for outdoor storage, wet dock environments, or applications involving direct water exposure unless treated with moisture-resistant coatings.

Limited reusability. Corrugated pallets are primarily one-way shipping platforms. While some designs can survive 2 to 5 trips, they are not intended for the long-term reuse cycles that wooden pallets support in domestic logistics.

Load capacity limits. While modern corrugated pallets handle impressive loads, very heavy applications (over 2,500 to 3,000 pounds per pallet for dynamic handling) may still require wooden or plastic pallets. Always verify load ratings for your specific application.

Racking compatibility. Not all corrugated pallet designs are compatible with pallet racking systems that require bottom-board contact across the rack beams. Verify racking compatibility before specifying corrugated pallets for warehoused products.

Forklift handling. Some corrugated pallet designs are more susceptible to fork damage than wooden pallets. Operator care and proper fork entry are more important with corrugated pallets.

The Market Shift

Adoption Drivers

Several trends are accelerating the adoption of corrugated pallets and paper-based shipping platforms.

Export growth. As international trade grows, the cumulative cost and risk of ISPM 15 compliance on wooden pallets increases, making exempt alternatives more attractive.

Sustainability goals. Corporate sustainability programs increasingly favor recyclable packaging over wood waste. Corrugated pallets support circular economy messaging and reduce the waste management burden at receiving locations.

Air freight economics. In air freight, where weight directly determines cost, the weight savings from corrugated pallets can exceed the pallet cost itself. High-value electronics, pharmaceuticals, and aerospace components shipped by air are strong candidates for corrugated pallets.

Supply chain simplification. Eliminating the need for ISPM 15 treatment, marking verification, and customs documentation simplifies the export process and reduces the risk of costly delays.

Market Size and Growth

The global corrugated pallet market is growing at approximately 6 to 8 percent annually, outpacing the overall pallet market growth rate. North America and Europe are the largest markets, driven by export activity and sustainability requirements.

The market remains a small fraction of total pallet volume — wooden pallets still dominate domestic logistics — but for international shipping applications, corrugated pallets have moved from niche alternative to mainstream option.

Decision Framework

Corrugated pallets make the most sense when the following conditions apply:

The shipment crosses international borders and is subject to ISPM 15
Weight reduction provides meaningful freight savings (especially for air freight)
The receiver prefers or requires recyclable packaging
The pallet load weight is within corrugated pallet ratings (typically under 2,500 pounds dynamic load)
The supply chain does not involve prolonged outdoor storage or wet conditions
Pallet return logistics are impractical or uneconomical

For domestic shipments where pallets are reused within a closed-loop system, wooden pallets remain the most economical option. But for export shipments — particularly those involving air freight, sustainability-conscious customers, or complex multi-country distribution — corrugated pallets increasingly represent the smarter choice.

The irony is notable: a regulation designed to control pests in wood packaging has become one of the strongest market drivers for corrugated packaging innovation. ISPM 15 compliance costs and risks are pushing the market toward a paper-based alternative that the corrugated industry is well-positioned to serve.