We machine HDPE sheet, rod and plate into chemically resistant liners, insulators and wear parts. Tight tolerances hold when blanks are stress relieved and cutters are kept sharp.
Most HDPE problems start before the first cut.
HDPE sheet is extruded under pressure, so the skin and the core cool at different rates. Cut a long liner in one pass and the stress releases. The part bows, bolt holes no longer line up, and the assembly has to be reworked or scrapped.
This material has a high coefficient of thermal expansion. A hole bored to a nominal size shrinks as the part cools, and an interference fit that worked on the bench seizes on the line. Bushing and pin fits need to be sized for the material, not for the drawing.
HDPE is soft and gummy. A dull cutter rubs rather than shears, so the edge frays and the chip melts back onto the wall. A sealed face becomes a leak path. Sharp tooling and climb milling solve it; running the spindle faster does not.
Engineers switch to plastic for corrosion resistance, then find that thin walls deflect under clamping and the cycle takes three times longer than expected. The savings disappear. Ribbing, support fixtures and correct feeds keep the price in line.
Blanks are stress relieved, cut at controlled feeds, and checked before they leave the floor.
Extruded HDPE plate carries locked-in stress. We rough the profile, let the part relax, then take the finishing passes. For long liners and tank walls we rough on both faces before finishing so the material moves evenly.
Clamping pressure matters as much as the cutter. Soft jaws and vacuum fixtures spread the load across a wide face, so a 12 mm wall does not dent where the vise closed on it.
Polyethylene cuts cleanly when the tool shears instead of pushes. We run polished flutes with high rake angles, keep the chip load high enough to leave the cutting zone, and blow the chips clear with air rather than flood coolant.
Coolant is where most shops go wrong. HDPE absorbs almost nothing, so fluid sits in the chip and later bleeds out of a supposedly clean part. Dry cutting with air blast keeps the part dry and the edge clean.
A short comparison against the materials customers usually weigh it against.
| Requirement | HDPE | Stainless 316L | POM (acetal) |
|---|---|---|---|
| Chemical resistance | Strong acids and bases, most solvents | Good, but chlorides pit it | Poor against strong acids |
| Electrical insulation | Very high, low moisture uptake | Conductive | Good, but absorbs moisture |
| Wear under sliding load | Low, deforms under load | Excellent | Excellent, best of the three |
| Weight | 0.95 g/cm³, floats | 8.0 g/cm³ | 1.41 g/cm³ |
| Cost per part | Low material cost | High material and tool wear | Mid-range |
| Best for | Tanks, liners, insulators, guides | Pressure and heat service | Gears, bushings, precision cams |
One shop for plastic and metal, so you can compare both before committing.
Machined and drilled liner plates, manway covers, baffles and overflow weirs for chemical dosing and plating tanks.
Busbar supports, terminal blocks and standoff plates where dielectric strength and low moisture uptake matter more than stiffness.
Chain guides, conveyor wear strips, star wheels and rail liners. Low friction, and no sparking against metal contact.
Drilled and tapped fluid routing blocks for water treatment and lab equipment, with port layouts checked against the assembly.
Cutters, chute liners, trays and handling fixtures in food-contact and medical grades. No coolant contamination on the surface.
Functional prototypes and short runs before a mold is cut, so the geometry can be tested under real chemical exposure.
Numbers we can hold on plastic parts, not just on aluminum.
| Item | Capability | Notes |
|---|---|---|
| Tolerance | ±0.005 mm | On critical bores and faces |
| As-machined finish | Ra 1.6–3.2 μm | Typical for HDPE |
| Fine finish | Ra 0.2–0.8 μm | Where sealing faces need it |
| Maximum part length | 4,000 mm | Sheet and plate work |
| Largest cutting travel | 4,000 × 400 × 150 mm | Long liners in one setup |
| Stock forms | Sheet, rod, plate | Thickness to 100 mm and above |
| Order size | One part to 10,000+ | No minimum order quantity |
| Inspection | 100% before shipment | Reports on request |
Fifteen years of plastic and metal work, in three plants.
Founded in 2011, with 150 technicians across three wholly-owned plants and 7,600 m² of floor space in Dongguan and Singapore.
Bores, faces and mating surfaces held to ±0.005 mm on 127 high-precision machines, including 16 simultaneous 5-axis centers.
Send the model and drawing. You get pricing and a free manufacturability review the same working day.
Once the drawing is signed off, cutting starts within a day. Parts normally ship in 3–5 days.
A 4,000 × 400 × 150 mm cutting envelope handles full tank liners without splitting the part into sections.
Raw material check, in-process monitoring and final inspection on every lot, with dimensional reports on request.
Liner plates, baffles and dosing manifolds that resist acids and chlorides.
Insulating plates and busbar spacers with low moisture uptake.
Chute liners, trays and guide rails in food-contact grades.
Wear strips and chain guides that run against steel without galling.
We work to ±0.005 mm on bores, faces and mating surfaces. That figure applies to the cut, not to the part over the next month.
HDPE moves with temperature. A part measured at 20 °C and installed at 60 °C will not measure the same. Tell us the service temperature and we size the fit for that condition.
Two reasons. The blank still had internal stress and released it during cutting, or the part is sitting in a warmer room than where it was measured.
We rough, let the part relax, then finish. For long parts we rough both faces first. That removes most of the movement before the final cut.
Yes, and we prefer it. We cut dry with an air blast to clear chips.
HDPE absorbs very little fluid, so anything that does get in sits there and bleeds out later. On a food or medical part that is a contamination risk, and on a sealed face it becomes a leak path.
Up to 4,000 mm long, with a cutting travel of 4,000 × 400 × 150 mm on our large machines.
For anything bigger we look at whether the part can be made in sections and joined, or whether a different process fits better. We will say so if it does.
Pick it for chemical resistance, electrical insulation and low weight. It handles strong acids and bases that attack stainless, and it does not conduct.
Do not pick it for sliding wear under load or for hot service. POM takes wear far better, and stainless holds up where the temperature climbs.
Yes. We machine food-contact and medical grades, keep them dry, and deburr every edge.
Work on medical parts runs under ISO 13485:2016. Tell us the grade on the drawing and we will confirm stock before quoting.
Yes. There is no minimum order quantity, from one prototype to runs of 10,000 or more.
Most plastics projects start as one or two parts to test the fit, then move to a larger batch once the geometry is settled.
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CNC Metals 13 grades
CNC Plastics 10 grades
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