Current material data (confirm against the selected grade before ordering)

PropertyCurrent value
Molded density20–66 kg/m³
Compression stress at 10%50–325 kPa
Long-term service temperature100 °C
Short-term dimensional stability temperature120 °C
Cold-use boundary−40 °C
Thermal conductivity0.036–0.042 W/(m·K)
Rebound30%
Hardness45–75 Asker-C
01EPP foam molding

Molded EPP
foam density
and properties.

Expanded polypropylene (EPP) is a closed-cell bead foam, steam-molded from polypropylene beads, that combines low weight, high energy absorption and excellent recyclability. Standard density grades run from 54–66 kg/m³ for stiff, load-bearing parts down to 20–25 kg/m³ for ultra-light cushioning and packaging.

Lightweight High energy absorption 100% recyclable Moisture & chemical resistant Reusable
Compression stress–strain kPa · ISO 844
0 250 500 750 1000 10% 25% 50% 75% 54–66 kg/m³ @10%: 255–325 kPa54–66 kg/m³ @25%: 315–395 kPa54–66 kg/m³ @50%: 400–500 kPa54–66 kg/m³ @75%: 790–980 kPa54–66 40–50 kg/m³ @10%: 130–175 kPa40–50 kg/m³ @25%: 175–235 kPa40–50 kg/m³ @50%: 260–340 kPa40–50 kg/m³ @75%: 530–680 kPa40–50 27–33 kg/m³ @10%: 70–100 kPa27–33 kg/m³ @25%: 110–160 kPa27–33 kg/m³ @50%: 180–230 kPa27–33 kg/m³ @75%: 370–470 kPa27–33 20–25 kg/m³ @10%: 50–70 kPa20–25 kg/m³ @25%: 80–110 kPa20–25 kg/m³ @50%: 150–190 kPa20–25 kg/m³ @75%: 340–440 kPa20–25
Apparent density kg/m³ · ISO 845
≈15×54–66
≈20×40–50
≈30×27–33
≈40×20–25

Property comparison· click a density grade to highlight

Property 54–66 kg/m³40–50 kg/m³27–33 kg/m³20–25 kg/m³ Test method
Nominal expansion ratio≈15×≈20×≈30×≈40×—
Tensile strength (kPa)1050–1350800–1000550–750420–560ISO 1926¹
Elongation at break (%)≥15on requeston requeston requestISO 1926
Compression stress (kPa)ISO 844
@ 10% strain255–325130–17570–10050–70
@ 25% strain315–395175–235110–16080–110
@ 50% strain400–500260–340180–230150–190
@ 75% strain790–980530–680370–470340–440
Flammability, burn rate (mm/min)≤70≤80≤90on requestGB 8410
Water absorption (%)on requeston requeston request≤8GB/T 8810
Service temperature (°C)−40 to +100 continuous · +120 short-term / intermittent—
¹ Tensile strength of the 20–25 kg/m³ grade is tested per ISO 1798 (flexible cellular materials); the 27–66 kg/m³ grades per ISO 1926 (rigid cellular plastics). Expansion ratio is approximate. Typical test ranges, not guaranteed limits; molded-part performance depends on geometry, wall thickness and achieved part density.

Compare in detail: EPP vs EPS foam, EPP vs EPO foam, EPP vs ETPU foam, EPP vs Beaded EPE foam, EVA vs EPP foam

Grade selection guide

G.01Best for

Structural & load-bearing parts

54–66 kg/m³≈15× expansion

Highest stiffness and strength.

G.02Best for

Structural cushioning · automotive & material handling

40–50 kg/m³≈20× expansion

Balanced strength-to-weight ratio.

G.03Best for

Protective packaging & lightweight parts

27–33 kg/m³≈30× expansion

Strong energy absorption.

G.04Best for

Ultra-light cushioning · insulation · dunnage

20–25 kg/m³≈40× expansion

Maximum weight savings.

V-0UL 94
Flame-retardant EPP
Need a fire rating? We offer a UL 94 V-0 flame-retardant EPP grade.

FR-modified beads reach a UL 94 V-0 rating while keeping EPP's cushioning and recyclability. Built for battery packs, ESS enclosures, rail and e-mobility interiors where a burn-rate spec alone isn't enough. Available across the density range above; tell us your target density and rating and we'll confirm the grade and supply test reports.

03Standards

Test
standards.

EPP methods

ISO 845Cellular plastics & rubbers: apparent density.
ISO 1926Rigid cellular plastics: tensile properties.
ISO 1798Flexible cellular materials: tensile strength & elongation at break.
ISO 844Rigid cellular plastics: compression properties.
GB 8410Burning behaviour of automotive interior materials (horizontal burn rate).
GB/T 8810Rigid cellular plastics: water absorption.
UL 94Flammability of plastic materials: vertical burn (V-0 grade available).

EPS methods

GB/T 4472Density & relative density of chemical products.
GB/T 6283Water in chemical products: Karl Fischer method.
QB/T 4009Expandable polystyrene (EPS) beads.
GB/T 8813Rigid cellular plastics: compression properties.
GB/T 8812.1/.2Rigid cellular plastics: flexural properties (bending load & strength).
GB/T 6344Flexible cellular materials: tensile strength & elongation.
GB/T 8811Rigid cellular plastics: dimensional stability.
RoHS / REACH · GB 8624Hazardous-substance compliance and burning-behaviour classification of building materials.

DUOBANGMEI (DBM) · EPP / EPS foam molding manufacturer · 40+ automatic molding machines · ISO 9001. Exact values to be confirmed with the factory.

Not sure which material
fits your part?

Send an inquiry → Back to home