A plastic pallet is a load platform molded from thermoplastic, most often high-density polyethylene (HDPE) or polypropylene (PP), that is washable, free of nails and exempt from ISPM 15. Designs range from light nestable one-way pallets to heavy rackable models with steel reinforcement, and the choice depends on the load, the handling equipment and how often the pallet is expected to be reused.
Materials: HDPE, PP and recycled resin
Two polymers dominate. HDPE offers good impact strength, chemical resistance and processability, and it is the most common resin in North America. Polypropylene is stiffer and tolerates higher temperatures better than HDPE, and a trade-press overview in Pallet Enterprise describes it as the most popular resin in Europe. A Virginia Tech survey of US plastic pallet makers found that HDPE accounted for about 68% of their 2018 production.
Other points on materials:
- Recycled content. Many pallets are molded from post-industrial or post-consumer regrind, usually HDPE or PP from crates, bottles and drums. Recycled resin lowers cost and environmental impact, but quality varies and contamination must be controlled. Pallets for food or pharmaceutical use often specify virgin resin or a certified recycled grade.
- Additives. UV stabilizers protect pallets stored outdoors, colorants support color-coding, and anti-static or conductive additives are used in electronics. Flame retardants are used in fire-rated pallets.
- Reinforcement. Steel tubes, fiberglass or other rods may be embedded in the pallet's decks or beams to stop sagging on racks.
How plastic pallets are made
The production method decides the weight, strength, price and design freedom of the pallet.
| Process | How it works | Typical result |
|---|---|---|
| Injection molding | Molten resin is injected into a steel mold under pressure | Fast cycles, precise dimensions, complex shapes; very costly molds |
| Structural foam | Resin with a foaming agent fills the mold, creating a cellular core | Lighter, stiff pallets with lower tooling cost than injection |
| Thermoforming | Heated plastic sheets are formed over a mold; often twin-sheet | Light, often nestable pallets; slower cycles, cheaper tooling |
| Rotational molding | Powder resin melts inside a rotating hollow mold | Hollow, durable, good for lower volumes and larger sizes |
| Compression molding | Material pressed between mold halves | Used with fillers and for some heavy-duty pallets |
| Profile extrusion | Plastic profiles are cut and joined, like boards | Custom sizes economically, closest to wooden pallet production |
Machines and process details are discussed in plastic pallet manufacturing machines. In the Pallet Enterprise overview, injection molding cycle times are given at around two minutes, against six to seven minutes for thermoforming, reflecting the trade-off between tooling cost and production speed.
Main pallet types
Plastic pallets are generally classified by how they are used:
- Nestable pallets have legs that fit into each other when stacked empty, greatly reducing the space needed for empty returns. They are generally lightweight, used in one-way or closed-loop work, and are not suited to heavy racking. See nestable, rackable and stackable pallets.
- Stackable pallets have solid feet or a skid base so that loaded pallets can stack on one another.
- Rackable pallets have reinforcement and rigid design for storage on beams. Their rating depends on the rack beam spacing.
- Hygienic pallets have closed, smooth decks, rounded corners and no cavities where residue can collect. They can be washed in automatic lines. See food safety pallets.
- Export or one-way plastic pallets are designed to be lightweight and inexpensive, used where ISPM 15 compliance or weight in air freight matter.
- Half and display pallets serve retail. See display, half and quarter pallets.
Strengths and limits
Plastic pallets have uniform weight and dimensions, do not splinter, absorb no moisture, resist most chemicals and are easy to clean. Dimensional consistency suits automated conveyors and storage systems. They are exempt from ISPM 15 because the standard covers wood packaging only; see ISPM 15 exemptions.
Limitations are also real. Plastic is a low-stiffness material, so rated load capacity is often limited by deflection or creep, particularly on racks. Virginia Tech's unit load research notes that stiffness tests, rather than strength tests, tend to set the rating of low-stiffness pallets. Properties change with temperature. Pallets are difficult to repair and can be slippery for loads unless the decks are textured or have anti-slip inserts.
Fire is another concern. Many plastics burn intensely, so insurers often require pallets approved by FM Approvals, which certifies non-wooden pallets whose burning and heat release characteristics are equivalent to or less critical than wood. Fire-retardant resins exist to meet such tests. A comparison with wood in all these respects is in wood vs plastic pallets.
Applications
Plastic pallets are used most where their advantages are most valuable:
- Food, beverage and pharmaceutical supply chains, where washing and the absence of splinters are important. See pharma pallets and GDP.
- Automotive and manufacturing, in closed loops with returnable packaging.
- Automated warehouses, because of uniform dimensions and weight.
- Cleanrooms and printing, where particles or dust are a problem.
- Pooling and rental, where pallets are tracked and returned. Tracking tags can be embedded; see pallet tracking and IoT.
- Export with ISPM 15 concerns, avoiding treatment, marking and rejection risk.
What drives the price
A plastic pallet's price is set by several factors rather than a single number. Resin cost, which follows oil and recycled-material markets, is the largest. Weight of material, reinforcement, mold or tooling cost spread over production volume, additives such as UV or flame retardant, certification such as FM approval, and the tracking tags can all add to the cost. Volume matters most for injection-molded designs because of tooling. Return rate and number of trips then decide the cost per trip, which is the real comparison.
Frequently asked questions
What are plastic pallets made of?
Mostly HDPE or polypropylene, often with recycled content, UV stabilizers and sometimes reinforcement rods.
How are plastic pallets made?
By injection molding, structural foam molding, thermoforming, rotational molding, compression molding or profile extrusion. Each balances tooling cost, cycle time and strength differently.
Can plastic pallets be used in racking?
Yes, if designed and rated for it. Rackable models are reinforced, and the rating depends on beam spacing and sustained-load deflection.
Are plastic pallets recyclable?
HDPE and PP can be reground and made into new products. Pallets that combine materials, such as steel reinforcement, need to be separated first.
Sources
- Pallet People Should Become Knowledgeable About Plastic — Pallet Enterprise
- An Investigation of the Plastic Pallet Industry in the United States in 2018 — Virginia Tech
- How Much Load Can My Pallet Carry? — Virginia Tech Center for Packaging and Unit Load Design
- Pallets — FM Approvals — FM Approvals