HDPE and PP are the two resins behind almost every plastic pallet on the market. They look similar on a spec sheet, they mould in the same machines, and suppliers often quote either one for the same job. But the two materials behave very differently once a pallet leaves the factory — and picking the wrong one costs you broken decks, sagging racks and rejected export shipments.
This guide compares HDPE vs PP plastic pallets across the properties that actually decide field performance, and gives you a simple rule for matching resin to application.
What HDPE brings to a pallet
HDPE (high-density polyethylene) is the workhorse of the pallet industry. Its molecular structure gives it outstanding impact strength, especially at low temperatures, and it absorbs repeated shock without cracking.
- Impact resistance — HDPE stays tough in cold rooms and freezer warehouses down to -40°C, where most other resins turn brittle.
- Stress-crack resistance — it tolerates long-term static loads and slow deformation far better than PP.
- Weldability — HDPE can be hot-plate welded, which makes two-piece and multi-piece pallet structures possible.
- Chemical resistance — excellent against most acids, alkalis and cleaning agents used in food and pharma plants.
The trade-off is stiffness. HDPE has a lower flexural modulus than PP, so an HDPE pallet of the same geometry will deflect slightly more on a rack beam. That is normally handled by adding ribs, steel reinforcement or increasing deck thickness.
What PP brings to a pallet
PP (polypropylene), particularly copolymer and impact-modified grades, is chosen when stiffness and dimensional stability matter more than cold impact.
- Higher stiffness — PP holds its shape better under racking loads and resists creep in long-term storage.
- Lower density — a PP pallet of identical volume is lighter, which trims export freight cost per unit.
- Better heat resistance — PP tolerates higher service temperatures, which matters in hot-climate yards and wash lines.
- Excellent fatigue resistance — integrated hinges and living-hinge features rely on this property.
The weak point is low-temperature impact. Standard homopolymer PP gets noticeably brittle below 0°C, which is why it is rarely specified for freezer logistics unless it is copolymer-modified.
Side-by-side comparison
| Property | HDPE | PP |
|---|---|---|
| Density (g/cm³) | 0.94 – 0.97 | 0.89 – 0.91 |
| Flexural modulus | Moderate | Higher |
| Impact strength at -20°C | Excellent | Poor to fair (copolymer better) |
| Service temperature ceiling | Around 60–70°C | Around 90–100°C |
| Long-term creep resistance | Good | Very good |
| Weldable into multi-piece structures | Yes | Limited |
| Typical pallet weight | Heavier | Lighter |
How to choose by job
Cold chain and freezer warehouses
HDPE is the safe answer. Pallets cycling between -25°C storage and ambient loading are exactly where PP fails — the first forklift impact on a frozen PP deck can shatter a corner. See our guide to plastic pallets for cold storage and freezer warehouses for the full freezer specification checklist.
Racking and high-bay storage
PP copolymer generally wins here, because its stiffness reduces deflection across unsupported beam spans. If you run open-loop racking with heavy point loads, ask for reinforced steel bars inside the deck regardless of resin — this is covered in detail in plastic pallet load ratings: static, dynamic and racking explained.
One-way export shipping
Light weight and low unit cost dominate. PP’s lower density translates directly into freight savings per container, and export pallets rarely see the multi-year stress that exposes PP’s weaknesses. Compare standard export dimensions in our plastic pallet sizes and dimensions guide.
Food, pharma and wash-down environments
HDPE is normally specified because of its chemical resistance and its tolerance for repeated high-temperature washing. For hygiene certification requirements, start with food-grade plastic certifications (FDA, EU 10/2011).
Closed-loop automotive and electronics logistics
Match the resin to the load profile, not to price. PP suits rigid uneven loads that need stiffness; HDPE suits impact-heavy handling. Our turnover boxes for automotive parts logistics guide explains the same logic for containers.
What resin choice does to cost per trip
HDPE pallets typically cost slightly more per unit and weigh more, but survive more trips. In closed-loop pools running 50+ trips per year, HDPE usually delivers the lower cost per trip. In export programmes where the pallet makes a single journey, the lighter PP unit almost always wins on total landed cost.
Before committing, work through the payback arithmetic in plastic pallet lifespan and cost per trip, and check supplier capability against 10 checks for choosing a plastic pallet supplier.
Our recommendation
If your operation involves cold storage, aggressive handling or frequent wash-downs, specify HDPE. If your operation is rack-based, temperature-stable and weight-sensitive, PP copolymer gives you a stiffer, lighter pallet at a lower unit price. When in doubt, tell us the load, the temperature range and the trip count, and we will recommend the resin and the reinforcement pattern together.
Foshan LSY Plastic moulds pallets in both HDPE and PP across 180T to 2500T machines, with in-house tooling for custom deck designs. Request a quotation or discuss a custom pallet programme.
