Choosing the right polyethylene grade is the single biggest factor in plastic part lifetime. Pick PE-1000 when PE-500 would do, and you have paid for performance you cannot use. Pick PE-300 where PE-1000 is needed, and the part fails in months. This guide shows how to match grade to application using molecular weight, wear data, and 8 real-world criteria.
What molecular weight actually means in practice
Polyethylene is classified by its average molecular weight. PE-300 (HMW-PE) sits around 300,000 g/mol. PE-500 (very-high-MW PE) is roughly 500,000 g/mol. PE-1000 (UHMW-PE, also called PE-UHMW or UHMWPE) is at least 3.1 million g/mol. As molecular weight rises, abrasion resistance, impact strength and low-friction performance all improve — but so does cost and machining difficulty. Density stays in the 0.93–0.94 g/cm³ band across all three grades, so weight savings are not the differentiator.
Side-by-side comparison: PE-300 vs PE-500 vs PE-1000
All values are typical room-temperature; consult the data sheet for exact figures.
| Property | PE-300 | PE-500 | PE-1000 |
|---|---|---|---|
| Molecular weight (×10⁶ g/mol) | 0.3 | 0.5 | ≥3.1 |
| Density (g/cm³) | 0.94 | 0.94 | 0.93 |
| Sand slurry abrasion (relative, steel = 100) | 180 | 240 | 600+ |
| Charpy impact (notched) | no break | no break | no break |
| Coefficient of friction (vs steel) | 0.20 | 0.18 | 0.10–0.15 |
| Continuous service temp (°C) | 80 | 80 | 80–90 |
| FDA / EU 10/2011 grade available | Yes | Yes | Yes |
| Typical CNC machinability | Excellent | Very good | Good |
| Relative cost index (PE-300 = 1.0) | 1.0 | 1.4 | 2.0–2.4 |
Wear resistance benchmark — ISO 15527 sand slurry test
The ISO 15527 sand slurry test is the most-cited wear comparison method for UHMWPE. A test specimen rotates in a slurry of quartz sand and water, and mass loss is measured after a fixed cycle count. PE-1000 typically shows 4–6× lower mass loss than PE-500 and 8–10× lower than PE-300. Note that real-world correction factors apply: hot slurries below 60 °C have minimal effect, but particle size, sharp edges and slurry pH all shift results. Use the benchmark to compare grades, not to predict absolute service life.
Application matrix — which grade for which job
Match these conditions to the recommended grade in your data sheet.
- Mining chute liner (iron ore, coal, copper concentrate) → PE-1000, 12–40 mm thick, counter-bored bolt mount
- Marine bollard facing pad → PE-1000, 30–80 mm thick, T-bolt capture or counter-bored mount
- Conveyor wear strip / chain guide (food line) → PE-1000 FDA grade, 6–25 mm thick
- Truck bed liner (gravel, scrap, bulk hauling) → PE-500 or PE-1000, 12–25 mm thick
- Ground protection mat (crane outrigger, temporary roadway) → PE-500 in standard load, PE-1000 for extreme
- Bushing or sliding pad (low-load, dry sliding) → PE-300 or PE-500, machined from rod stock
- Synthetic ice rink panel → PE-1000, 12–15 mm thick, dovetail edge profile
- Cutting board / food prep surface → PE-500 FDA grade (PE-1000 is overkill for this duty)
When PE-300 is the right answer
Engineers often default to PE-1000 because it is famous, but PE-300 is genuinely superior for some duties: low-load bushings, sound-deadening pads, gaskets, and any part that needs tighter machining tolerances than PE-1000 can hold. PE-300 also accepts adhesive bonding more readily than PE-1000, which simplifies assembly for multi-piece jigs and fixtures. Joining is by mechanical fastening, counter-bored bolting, T-bolt capture, tongue-and-groove or fillet plates.
Frequently Asked Questions
Is PE-1000 always better than PE-500?
No. PE-1000 wears 2.5× longer in slurry abrasion but costs 50% more. For a part that wears out from corrosion or impact rather than abrasion, PE-500 is the right choice.
Can I substitute PE-300 for HDPE?
PE-300 is a high-MW HDPE — the names overlap. Standard injection-grade HDPE has molecular weight around 100,000 g/mol; PE-300 starts at 300,000 g/mol. Always confirm the molecular weight on the Material Test Report.
Does FDA-grade UHMWPE cost more?
Typically 5–10% premium over standard PE-1000. FDA grade has tighter additive control and a CoA confirming compliance with FDA 21 CFR 177.1520 and EU 10/2011.
What thickness do you stock?
PE-1000 in 6, 8, 10, 12, 15, 20, 25, 30, 40, 50, 60, 80 and 100 mm. PE-500 and PE-300 in 6–50 mm. Custom thickness on request, MOQ from 1 piece.
Do you provide MTR with each shipment?
Yes. Each batch ships with Material Test Report (MTR) showing density, molecular weight grade, batch heat number, and ISO 9001 inspection sign-off. CoA on request.