What is the best insulation material for refrigerated truck bodies?

The two leading options are PU (polyurethane) foam and MPP (micro-porous polypropylene). PU foam is the traditional choice — low thermal conductivity (0.022-0.028 W/m·K), well-understood, widely available. MPP is the newer alternative — similar thermal performance (0.028-0.035 W/m·K), but food-contact safe (no chemical blowing agents), 100% recyclable, and better long-term moisture resistance. Choose PU for lowest initial cost and extreme-cold applications. Choose MPP for food transport, recyclability requirements, and long-term performance stability.

Why is food-contact safety important for reefer insulation?

In refrigerated trucks carrying unpackaged or lightly packaged food (meat, produce, dairy), the insulation panels form the interior walls that food may contact. Traditional PU foam uses chemical blowing agents (HCFC, HFC, or pentane) that can off-gas volatile compounds — some jurisdictions restrict this for direct food contact. MPP insulation uses supercritical CO₂ physical foaming, leaving zero chemical residue. The resulting material is inherently food-contact safe without needing additional barrier layers, simplifying construction and reducing cost.

How does CKD work for refrigerated truck bodies?

CKD (Completely Knocked Down) refrigerated truck bodies ship as insulated panel kits: wall panels, floor panels, roof panels, door assemblies with gaskets, and hardware. Panels are pre-insulated — the MPP or PU foam core is factory-bonded between face sheets during production. Assembly at the destination takes 4-6 hours (longer than dry freight due to sealing requirements). All joints must be sealed with EPDM gaskets and compression latches to maintain the thermal envelope. The refrigeration unit (compressor, evaporator, condenser) is sourced and installed locally.

What temperature range can MPP-insulated reefer bodies maintain?

With appropriate refrigeration equipment, MPP-insulated reefer bodies maintain -25°C to +12°C depending on insulation thickness and refrigeration unit capacity. Standard configuration: 50mm wall insulation + 60mm floor insulation handles -18°C frozen goods and 0-4°C chilled goods. For deep-freeze applications (-25°C), wall thickness can be increased to 75-80mm. The thermal performance is maintained long-term because MPP closed-cell structure resists moisture absorption that degrades foam insulation over time.

Refrigerated Truck Body Solutions: From Insulation Materials to Complete CKD Assembly

The Cold Chain Challenge

Refrigerated transport is the critical link in the food supply chain. The insulation system inside a reefer truck body determines how effectively temperature is maintained, how much energy the refrigeration unit consumes, and how long the body maintains structural integrity under constant thermal cycling and moisture exposure.

Traditional reefer bodies use polyurethane (PU) foam insulation — effective but not without drawbacks. PU foam absorbs moisture over years of service, gradually losing insulation efficiency. It uses chemical blowing agents that raise food-contact concerns. And it's a thermoset material that cannot be recycled at end of life.

Our MPP (Micro-Porous Polypropylene) insulation technology addresses all three limitations while delivering comparable thermal performance.

Insulation Material Comparison: MPP vs PU vs XPS

Property	MPP ★	PU Foam	XPS
Thermal Conductivity	0.028-0.035 W/(m·K)	0.022-0.028 W/(m·K)	0.030-0.040 W/(m·K)
Food-Contact Safe	Yes (CO₂ foaming)	Varies (chemical agents)	No
Recyclable	Yes (100% PP)	No (thermoset)	Limited
Water Absorption (long-term)	<0.5% (closed-cell)	1-3% (degrades over time)	<0.3%
Compressive Strength	0.3-1.0 MPa	0.15-0.35 MPa	0.2-0.7 MPa
Operating Temp	-40 to +80°C	-50 to +80°C	-50 to +75°C
Blowing Agent	CO₂ (physical)	HCFC/HFC/Pentane	CO₂ or HFC
Cost (relative)	$$$	$$	$$
Best For	Food transport, recyclable fleets	General cold chain, lowest cost	Building insulation

Supercritical CO₂ Foaming: The Technology Behind MPP

What makes MPP special is the foaming process. Instead of chemical blowing agents (which leave residual compounds in the foam), we use supercritical CO₂ — carbon dioxide pressurized above 7.38 MPa and heated above 31°C, where it behaves like both a liquid and a gas. This supercritical CO₂ dissolves into molten polypropylene under pressure. When pressure is released, the CO₂ expands to create millions of uniform micro-pores throughout the PP matrix.

The result: a rigid foam with excellent thermal insulation properties, zero chemical residue, food-contact safety, and full recyclability. The CO₂ used in the process is captured and recycled, making it an environmentally responsible manufacturing method.

Complete Reefer Body Solution: From Panels to CKD Assembly

We don't just supply insulation material — we build completerefrigerated truck bodies using MPP insulation:

Wall panels: 50mm MPP core with double-sided PET composite face sheets.Floor panels: 60mm MPP core with anti-slip CFRT top surface, rated for 2000+ kg.Roof panels: 50mm MPP core with UV-resistant exterior.Door assemblies: Insulated swing doors with EPDM gaskets and stainless steel compression latches for airtight sealing.

The entire body ships as a CKD (flat-pack) kit, assembled at the destination in 4–6 hours. The refrigeration unit (compressor, evaporator, condenser) is sourced and installed locally to match the customer's temperature and power requirements.

Assembly from Malaysia

Our reefer bodies are assembled at our facility in Kulai, Johor, Malaysia, providing customers with favorable trade logistics for global export. The CKD component supply chain: MPP boards and composite panels manufactured in China (Tongxiang) → shipped to Malaysia for assembly and quality inspection → exported as complete insulated bodies to the customer's market.

FAQ

What is the best insulation for reefer truck bodies?

PU foam for lowest cost and extreme cold. MPP for food-contact safety, recyclability, and long-term moisture resistance. Both achieve excellent thermal performance.

Why is food-contact safety important?

Interior walls contact food directly in many applications. PU foam uses chemical blowing agents; MPP uses CO₂ (zero residue, inherently food-safe).

How does CKD work for reefer bodies?

Pre-insulated panels ship flat. Assembly takes 4–6 hours with bolt-together connections and gasket sealing. Refrigeration unit installed locally.

What temperature range?

-25°C to +12°C with standard insulation thickness. Deep-freeze (-25°C) uses 75–80mm walls. Chilled (0–4°C) uses standard 50mm walls.

Need Cold Chain Solutions?

MPP insulation panels or complete CKD refrigerated truck bodies. Food-contact safe, recyclable, assembled in Malaysia.

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