EPP90
Grade
EPP90 = ePP 90 g/L
For load-bearing cores, tool trays and crash structures where stiffness matters more than mass saving.
Values for the EPP90 condition
Other EPP grades and fills
EPP is listed in 8 conditions; see the grade overview at EPP.
Compare all 8 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
EPP 20 g/L | Lightest standard grade for low-mass void fill and light protective packaging where loads are small. | 0.18 | 0.25 | 15 | 15 Shore A |
Flame-retardant EPP | Specify where transport, rail-interior or appliance fire requirements demand better than plain HB behaviour. | 0.26 | 0.35 | 14 | 18 Shore A |
Cold drawn | Use for ESD-protective trays and shielding-class dunnage needing permanent, humidity-independent conductivity. | — | 0.36 | 15 | — |
EPP30Default EPP 30 g/L | The general-purpose density for reusable packaging, dunnage and automotive trim energy absorbers. | — | 0.4 | 18 | — |
EPP 45 g/L | Choose when heavier parts or higher crush loads must be carried with still-good multi-impact recovery. | 0.45 | 0.6 | 20 | 25 Shore A |
EPP 60 g/L | Used for bumper cores, knee bolsters and heavy-duty returnable containers needing higher plateau stress. | 0.65 | 0.85 | 22 | 30 Shore A |
EPP90This page EPP 90 g/L | For load-bearing cores, tool trays and crash structures where stiffness matters more than mass saving. | 1 | 1 | 24 | 40 Shore A |
EPP 120 g/L | Highest standard density, for severe repeated impact and semi-structural inserts where crush stress must be maximised. | 1 | 2 | 25 | 46 Shore A |
What is EPP90?
EPP90 is EPP in the EPP90 grade — for load-bearing cores, tool trays and crash structures where stiffness matters more than mass saving. EPP90 has a tensile strength of 1 MPa (0.189 ksi), weaker than 85% of polymer grades. Elongation at break is 24% and the elastic modulus is 0.02 GPa (0.0025 Msi). EPP90 has a density of 0.09 g/cm³ (0.0033 lb/in³), lighter than 86% of polymer grades. Its glass-transition temperature is -12°C (10 °F). EPP30 is the default condition FabDigit quotes; EPP90 is available on request or by drawing note.
Advantages
- Lightweight — 0.09 g/cm³ (0.0033 lb/in³), better than 86% of polymer grades
- Good corrosion resistance — 90/100, better than 82% of polymer grades
Limitations
- Poor heat conductor — 0.05 W/m·K (0.0289 BTU/hr·ft·°F), worse than 84% of polymer grades
- Low stiffness — 0.02 GPa (0.0025 Msi), worse than 76% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
- Absorbs moisture — dry before molding — 0.6%, worse than 75% of polymer grades
EPP90 properties
Typical room-temperature values for EPP90; 20 are specific to this condition. Other listed values are EPP reference data and may not represent this condition. Bars are the position among polymer grades.
Physical5
EPP90 has a density of 0.09 g/cm³ (0.0033 lb/in³), lighter than 86% of polymer grades. Its glass-transition temperature is -12°C (10 °F).
Mechanical10
EPP90 has a tensile strength of 1 MPa (0.189 ksi), weaker than 85% of polymer grades. Elongation at break is 24% and the elastic modulus is 0.02 GPa (0.0025 Msi).
Thermal8
EPP90 is rated for continuous service to 105°C (221 °F). It conducts heat at 0.05 W/m·K (0.0289 BTU/hr·ft·°F), worse than 84% of polymer grades. Thermal expansion is 90 µm/m·K (50 µin/in·°F).
Electrical5
EPP90 has an electrical resistivity of 1×10¹³ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), better than 82% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of EPP90 takes about 100 MJ of energy and emits 3.8 kg of CO₂ — less than 61% of polymer grades. Typical recycled content is 10%.
Manufacturability4
EPP90's machinability is good (65/100, better than 66% of polymer grades); weldability good (60/100); formability poor (28/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with EPP90
Is EPP easy to machine?
Blocks cut cleanly with hot wire, band knife or CNC router at high feed; avoid slow, high-friction tooling that melts and smears the skin.
Can EPP be welded?
Beads fuse to each other by saturated steam in the mould; parts can be joined by hot-air/hot-plate welding, ultrasonic staking or PP-compatible hot-melt and double-sided tape—solvent glues do not bond PP.
Can EPP be formed, bent or molded?
Made by steam-chest bead moulding (typ. 0.20–0.40 MPa steam, ~130–145 °C) after bead pre-expansion; allow 1.5–3.5% shrink plus post-mould stabilization/drying, and design generous draft and steam-hole layout.
What surface finishes work on EPP?
Surfaces accept flame or corona pre-treatment then PP-compatible primer/water-based paint, in-mould films and skins; no plating or anodizing, and printing needs low-tack, low-solvent inks.
EPP chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| ethylene comonomerin random-copolymer EPP beads, lowers fusion temperature | 0 – 8 | 4 |
| blowing agent residue (CO2 / pentane / acell gas largely replaced by air after ageing | 0 – 1 | 0.3 |
| stabilizers / nucleants / pigmentsantioxidant, talc nucleant, colour; carbon black in conductive grades | 0.1 – 3 | 1 |
| propylene (PP repeat unit)high-melt-strength homopolymer or random copolymer base resin | ≥ 92 (balance) | — |
EPP90 — frequently asked
What is EPP90 used for?
EPP90 is typically used for automotive bumper energy absorbers, reusable protective packaging, sound/vibration insulation, sports protective gear and returnable dunnage trays. In short: lightest structural PP form; multi-impact energy absorber; reusable packaging foam.
What is the tensile strength of EPP90?
EPP90 has a typical tensile strength of 1 MPa (0.189 ksi) — weaker than 85% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is EPP90 easy to machine?
Reasonably — machinability is rated good (65/100, better than 66% of polymer grades). Blocks cut cleanly with hot wire, band knife or CNC router at high feed; avoid slow, high-friction tooling that melts and smears the skin.
Can EPP90 be welded?
Yes — weldability is rated good (60/100). Beads fuse to each other by saturated steam in the mould; parts can be joined by hot-air/hot-plate welding, ultrasonic staking or PP-compatible hot-melt and double-sided tape—solvent glues do not bond PP.
What surface finishes work on EPP90?
Surfaces accept flame or corona pre-treatment then PP-compatible primer/water-based paint, in-mould films and skins; no plating or anodizing, and printing needs low-tack, low-solvent inks.
Can EPP90 be formed, bent or molded?
Made by steam-chest bead moulding (typ. 0.20–0.40 MPa steam, ~130–145 °C) after bead pre-expansion; allow 1.5–3.5% shrink plus post-mould stabilization/drying, and design generous draft and steam-hole layout.
What is the maximum service temperature of EPP90?
EPP90 is rated for continuous use to about 105°C (221 °F), and briefly to 130°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between EPP30 and EPP120?
EPP30 is the default condition — the general-purpose density for reusable packaging, dunnage and automotive trim energy absorbers. EPP120: highest standard density, for severe repeated impact and semi-structural inserts where crush stress must be maximised.
Sources
- ARPRO Expanded Polypropylene technical data (density range 20–120 g/L) — JSP (2023)
- Neopolen P particle foam product information — BASF (2022)
- Eperan-PP expanded polypropylene data sheets — Kaneka (2022)
- Engineered Materials Handbook Vol. 2: Engineering Plastics (polypropylene) — ASM International (1988)
- Cellular Solids: Structure and Properties — Cambridge University Press (Gibson & Ashby) (1997)
- Polypropylene foam property records — CAMPUS / UL Prospector (2024)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.