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

PropertyCurrent value
Molded density15–60 kg/m³
Compression stress at 10%60–430 kPa
Long-term service temperature75 °C
Short-term dimensional stability temperature85 °C
Cold-use boundary−50 °C
Thermal conductivity0.032–0.037 W/(m·K)
Rebound5–15%
Hardness70–95 Asker-C
02EPS foam molding

Molded EPS
foam density
and properties.

Expanded polystyrene (EPS) is a rigid, lightweight closed-cell bead foam (natural white), steam-molded from expandable polystyrene beads, offering excellent cushioning, thermal insulation and outstanding cost efficiency. Standard commodity grades at nominal molded densities of 20, 25 and 30 kg/m³.

Lightweight Cost-effective Thermal insulation Shock absorbing 100% recyclable
Strength by grade kPa · GB/T · minimum
0 100 200 300 400 Compression @10% Tensile Flexural 20 kg/m³≥90 kPa≥200 kPa≥220 kPa≥90≥200≥220 25 kg/m³≥120 kPa≥250 kPa≥300 kPa≥120≥250≥300 30 kg/m³≥160 kPa≥350 kPa≥400 kPa≥160≥350≥400

Molded properties· click a grade to highlight

Property 20 kg/m³25 kg/m³30 kg/m³ Method
Nominal molded density (kg/m³)202530—
Compression stress at 10% (kPa)≥90≥120≥160GB/T 8813
Tensile strength (kPa)≥200≥250≥350GB/T 6344
Flexural strength (kPa)≥220≥300≥400GB/T 8812.2
Breaking bending load (N)≥20≥25≥28GB/T 8812.1
Water absorption (%)≤2≤2≤2GB/T 8810 (A)
Dimensional stability (%)≤2≤2≤2GB/T 8811

Raw bead properties

Raw bead property Value Method
Solid (bead) density (g/cm³)1.03–1.05GB/T 4472
Moisture content (%)≤1.8GB/T 6283
Residual monomer (%)≤0.2QB/T 4009
Blowing-agent content (%)4.0–6.8QB/T 4009
Sieving efficiency (%)≥90QB/T 4009
ComplianceRoHS & REACH · MSDS available · flame-retardant grades reach GB 8624 B1

Compare in detail: EPP vs EPS foam

Grade selection guide

G.01Best for

General protective packaging & void fill

20 kg/m³Compression stress at 10% ≥90 kPa

Lightest of these grades and the most economical.

G.02Best for

Higher-strength packaging & parts

25 kg/m³Compression stress at 10% ≥120 kPa

Balanced cost and performance.

G.03Best for

Load-bearing packaging & insulation

30 kg/m³Compression stress at 10% ≥160 kPa

Highest strength of these grades.

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.

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 8810Rigid cellular plastics: water absorption.
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.

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