- Cross-linking: chemical (peroxide) cross-linking
- Expansion ratio: 3–40 times
- Density: 26.8–300 kg/m³ (see table below)
- Width: 500–2000 mm
- Thickness: single layer 3–15 mm; heat-bonded multi-layer 15–200 mm
- Surface treatment: calendering or corona treatment available
- Colour: black, white, gray, custom colours
Chemically cross-linked polyethylene foam for cushioning, insulation and converted parts. Choose the ratio, thickness and contact conditions together; density alone does not define the finished part.
Supply range and selection
Single layer 3–15 mm; heat-bonded multi-layer 15–200 mm; width 500–2000 mm.
XPE uses chemical cross-linking. Compare IXPE when a single layer below 3 mm is needed, and IXPP when the thermal environment is the main constraint.
Published physical properties
Published factory data are grade- and method-specific. MD means machine direction; TD means transverse direction. Test-sheet values do not certify the finished assembly. On a small screen, scroll each table horizontally.
Ratio | Density (kg/m³) | Shore hardness (C) | Tearing strength MD/TD (kN/m) | Water absorption (%) | Thermal conductivity (W/m·K) |
|---|---|---|---|---|---|
3x | 300±40 | 65–75 | ≥14 / ≥12 | ≤0.2 | ≤0.095 |
5x | 200±30 | 60–70 | ≥13 / ≥12 | ≤0.2 | ≤0.095 |
8x | 125±15 | 50–60 | ≥9.5 / ≥9.0 | ≤0.2 | ≤0.084 |
10x | 100±10 | 45–50 | ≥6.5 / ≥6.0 | ≤0.2 | ≤0.073 |
15x | 66.7±8 | 35–45 | ≥5.0 / ≥4.5 | ≤0.3 | ≤0.065 |
20x | 50±6 | 30–35 | ≥3.0 / ≥2.5 | ≤0.3 | ≤0.055 |
25x | 40±4 | 25–30 | ≥2.5 / ≥2.0 | ≤0.4 | ≤0.049 |
30x | 33.3±3 | 18–25 | ≥1.5 / ≥1.2 | ≤0.4 | ≤0.045 |
35x | 28.6±2 | 13–18 | ≥1.3 / ≥1.2 | ≤0.4 | ≤0.040 |
40x | 26.8±3 | 13–18 | ≥1.3 / ≥1.1 | ≤0.4 | ≤0.040 |
Ratio | Tensile strength MD/TD (MPa) | Elongation at break MD/TD (%) | Compression set (%) 23±2 °C, 22 h | Dimensional change MD/TD (%) 70±2 °C, 22 h |
|---|---|---|---|---|
3x | ≥1.6 / ≥1.4 | ≥170 / ≥150 | ≤2 | ≤6 / ≤4 |
5x | ≥1.5 / ≥1.3 | ≥150 / ≥130 | ≤2 | ≤6 / ≤4 |
8x | ≥1.0 / ≥0.9 | ≥125 / ≥120 | ≤3 | ≤6 / ≤4 |
10x | ≥0.8 / ≥0.7 | ≥120 / ≥110 | ≤5 | ≤6 / ≤4 |
15x | ≥0.6 / ≥0.5 | ≥110 / ≥100 | ≤7 | ≤6 / ≤4 |
20x | ≥0.38 / ≥0.35 | ≥90 / ≥80 | ≤8 | ≤8 / ≤6 |
25x | ≥0.35 / ≥0.3 | ≥90 / ≥80 | ≤10 | ≤8 / ≤6 |
30x | ≥0.25 / ≥0.2 | ≥90 / ≥80 | ≤10 | ≤8 / ≤6 |
35x | ≥0.2 / ≥0.15 | ≥80 / ≥70 | ≤11 | ≤8 / ≤6 |
40x | ≥0.15 / ≥0.12 | ≥80 / ≥70 | ≤11 | ≤8 / ≤6 |
Test standards: density GB/T 6343 · hardness GB/T 2411 · tearing strength GB/T 10808 · tensile strength and elongation GB/T 6344 · water absorption GB/T 1034 (method 4) · thermal conductivity GB/T 10297 · compression set GB/T 6669 · dimensional change GB/T 8811. MD is the machine direction and TD the transverse direction. Compression set at 23±2 °C for 22 hours runs from ≤2% at 3x to ≤11% at 40x; dimensional change at 70±2 °C for 22 hours is within 4% transversely and 6% longitudinally up to 15x, widening to 6% and 8% above that.
What the material data do and do not establish
Closed-cell foam has low water absorption, not zero absorption or guaranteed waterproof joints. Compression set is a measured residual deformation, not a promise of complete recovery or unlimited cycling. Acoustic, thermal, electrical, chemical and fire requirements must be assessed for the selected grade and complete assembly. We do not infer food-contact, medical or child-product approval from the polymer or cross-linking process.
Functional grades and conversion
Flame-retardant, heat-resistant, conductive and anti-static versions require a specified grade and applicable test method; these properties are not included in every standard sheet. A facing or adhesive can change the result. Die-cutting, slitting, lamination and other requested operations are reviewed against the drawing, base grade and layer construction. Printing requirements and responsibility are agreed separately.
Ordering, samples and approval
Standard rolls and sheets: MOQ 1,000 m²; custom parts: minimum quantity confirmed from the drawing. Standard lead time is 15–20 days from order confirmation; confirm the schedule for the selected specification. A4 material samples are free with shipping included; machined samples, tooling and fixtures are quoted separately.
Send the application, thickness, ratio or density, dimensions, quantity and working environment. If these are unknown, describe the constraint first. Agree the drawing revision, critical dimensions, measurement conditions and approval sample before production; retain that record for repeat orders.
Bofeng Foam manufactures XPE, IXPE and IXPP in Zhuhai. Existing grade specifications and available reports can be requested; ISO 9001 and ISO 14001 are management-system certifications, not product approvals.