HDPE Sheet 4×8 (3/6/10/12 mm): Tolerance, Weight & Price Factors
At Zhihong Plastic, we manufacture 4×8 ft HDPE sheets (≈1220×2440 mm) for signage, fabrication, tanks, liners and OEM parts. Below is a clear, engineering-first guide you can use for RFQs and purchasing. We include our factory reference tolerances, real weight calculations, and the pricing variables we actually use in quoting.
Standard Specs — What We Supply
| Item | Our Standard | Notes |
|---|---|---|
| Base Size | 4×8 ft (≈1220×2440 mm) | Cut-to-size available |
| Thickness Options | 3 / 6 / 10 / 12 mm (others on request) | Typical range 1–40 mm |
| Density | ~0.95 g/cm³ | Engineering-grade HDPE |
| Thickness Tolerance | ±0.2–0.5 mm | Depends on gauge; confirm in PO |
| Flatness | <2 mm/m (typ.) | Measured on granite table |
| Surface | Matte / Orange-peel | Protective film optional |
| UV Stabilization | Outdoor grade optional | For signage/playgrounds |
| Colors | Black / Natural / Custom colors | Pantone match with MOQ |
| MOQ | 30–50 sheets / color | Mixed colors allowed |
| Lead Time | 7–15 days | By color and volume |
Weight per Sheet (4×8 ft)
Our formula: Weight(kg) = Area(m²) × Thickness(mm) × Density(kg/m³) ÷ 1000
For 4×8 ft, Area = 1.22 × 2.44 = 2.9768 m²; Density(HDPE) ≈ 950 kg/m³ → Weight ≈ 2.9768 × Thickness(mm) × 0.95.
| Thickness | Nominal Weight / Sheet | Weight Window (±0.5 mm tol.) |
|---|---|---|
| 3 mm | ≈8.49 kg | ≈7.07–9.92 kg |
| 6 mm | ≈16.97 kg | ≈15.55–18.40 kg |
| 10 mm | ≈28.29 kg | ≈26.85–29.73 kg |
| 12 mm | ≈33.95 kg | ≈32.51–35.39 kg |
Weight varies with actual thickness, density and environment. For freight planning, we can quote per-sheet average and pallet totals.
Why Tolerance & Flatness Matter in Real Work
- CNC consistency: A tighter thickness window gives predictable engraving depth and cleaner passes.
- Assembly fit: ±0.5 mm at 12 mm is ~±4.2% section change—design slots instead of tight holes.
- How we check: We map 8–16 points per sheet, measure flatness on granite, and check ΔE for colored sheets.
Price Factors — How We Build Your Quote
- Resin & color system — Natural/black usually lower; custom color & UV add cost.
- Gauge & tolerance — Heavier gauges and tighter tolerance raise resin usage & scrap control.
- Processing — Cut-to-size, rounded corners, drilling, protective film.
- Batching — Small runs or frequent color changes increase purge loss.
- Packing & logistics — Film, corner protectors, pallets, export packing, freight lane.
- Terms — EXW/FOB/CIF and currency affect landed cost.
HDPE vs UHMW-PE vs PP — When We Recommend Each
- HDPE — General fabrication, good rigidity, easy machining; best value for most 4×8 projects.
- UHMW-PE — Wear strips & chute liners (abrasion/low friction). Mind creep at elevated temperature—see our UHMW-PE temperature guide.
- PP — Better heat & chemical resistance than HDPE; consider for hot-wash and chemical tanks.
Ordering Checklist — Copy This into Your RFQ
- Material & grade: HDPE (UV yes/no), color:
- Size & thickness: 1220×2440 mm × (3/6/10/12 mm):
- Tolerance request: e.g., ±0.3 mm on 6 mm
- Quantity (mixed colors OK) / cut-to-size list (if any)
- Packing: film / corner protectors / pallet spec
- Destination & terms: EXW/FOB/CIF + port
Need outdoor signage grade or two-color engraving sheets? Explore Two-Color HDPE. For other categories, visit Products or Contact Us for a fast quote.
FAQ
Can you hold tighter thickness than ±0.5 mm?
Yes. On select gauges we can run tighter control with a tolerance surcharge. Tell us your machining need and we’ll confirm feasibility.
Do you supply UV-stabilized outdoor grade?
Yes. Outdoor grade is available and commonly used for signage/playground panels. Expect a small premium.
Can you cut to size and drill holes?
Yes. Send drawings or a cut list. We’ll nest parts to reduce waste and quote separately for machining.
What’s your usual MOQ and lead time?
MOQ 30–50 sheets per color; typical lead time 7–15 days depending on color and volume.
