SERVICES
PE Injection Molding
We mold HDPE, LDPE/LLDPE and UHMWPE for functional, structural and aesthetic parts — from low-volume bridge runs to high-volume production. PE's 1.5–4 % crystalline shrinkage makes dimensions the hard part; shrinkage-compensated cavities and DFM grade selection keep them in tolerance, not in the scrap bin.
THE REAL DECISION
Small-Batch Sourcing, Done Right vs. Done Wrong
Low-volume buyers usually hit one of two paths. The wrong one costs months and doubles the budget; the right one gets real production parts in your hand in weeks. Here is what separates them.
Large-dimension instability
PE shrinks 1.5–4 % depending on grade — long dimensions on large parts drift out of tolerance when the cavity is not sized for the exact grade's shrink behavior.
Warpage & sink marks
Crystalline packing and uneven cooling pull thin plates out of flat and leave sink behind bosses and ribs — the classic reject on housings and covers.
WHAT WE OFFER
The Route That Fits Your Order
PE: The Most-Molded Polyolefin, in Three Personalities
Polyethylene is the world's most-produced plastic, and each PE family behaves differently in the mold — HDPE for toughness, LDPE/LLDPE for flexibility, UHMWPE for extreme wear. MOLDITQUICK molds all three families on automated presses under ISO9001 control.
Durability and strength (HDPE) — high impact resistance for parts with a lifetime of abuse: automotive fluid tubes, protective helmets, wheel well liners.
Flexibility and softness (LDPE / LLDPE) — squeezable tubes, flexible containers, seals and gaskets that must bend without cracking.
Chemical and moisture resistance — stable in aggressive environments: outdoor electrical junction boxes and battery cases that face the elements daily.
Excellent electrical insulation — cable insulation, switch housings and PCB-support parts are classic PE applications.
Low cost per part — PE is one of the cheapest resins to mold, at a fraction of engineering-plastic prices.
Toughness at low temperature — PE keeps impact strength well below freezing, suiting outdoor and cold-chain parts.
HDPE vs. LDPE vs. UHMWPE: Which PE Grade Fits?
The grade choice drives both part performance and processing — here is how the three main PE families compare on standard property data, matched against our production molding experience.
PE Grade Families We Mold
The base families and modified compounds we run on-site — selected at DFM against your tolerance, environment and cost targets.
PE Processing Parameters We Control
Barrel, mold and shrinkage windows per standard PE molding practice and material data — verified on our presses under ISO9001 control.
| Parameter | Recommended Range | Why It Matters |
|---|---|---|
| Barrel temperature | 180–280 °C (HDPE 210–270, LDPE 160–260) | Crystalline melt needs full plasticization; overshooting degrades and causes odor and splay. |
| Mold temperature | 20–60 °C | Cool molds shorten cycles; hotter molds reduce sink and improve surface for cosmetic parts. |
| Mold shrinkage | 1.5–4 % (HDPE 1.5–3, LDPE 2–4) | The highest of common thermoplastics — cavity sizing and cooling balance are set at DFM. |
| Drying | Generally not required | PE absorbs under 0.1 % moisture — resin can go from silo to screw without pre-drying. |
| Injection pressure | 70–150 MPa typical | High enough for thin-wall parts; watch flash on the parting line as pressure climbs. |
| Melt flow index | 2–50 g/10 min by application | Low MFI for toughness, higher MFI for thin-wall flow — selected per part at DFM. |
Where PE Injection Molding Pays
Automotive & HEV
Air ducts, fluid reservoirs, wheel well liners, battery cases and sound-dampening panels.
Tools & equipment
Insulating sleeves, bushings, handheld-device casings and PCB supports and brackets.
Electrical enclosures
Outdoor junction boxes, switch boxes and router/modem housings that face weather and moisture.
Protective goods
Helmets, cable insulation and fluid-handling tubes where impact and chemical resistance matter.
Flexible products
Squeeze tubes, flexible containers and seals in LDPE/LLDPE grades.
Packaging & storage
Bins, drums and containers — the classic high-volume PE territory at lowest unit cost.
FAQ
PE Injection Molding — FAQ
Can you help with product development?
Yes. From design review and material selection to prototyping, tooling and mass production — our engineers support you through the entire product lifecycle.
Do you ship internationally?
Yes. We ship worldwide via air and sea freight, with export packing, documentation and delivery tracking handled by our team.
What quality inspections do you perform?
First article inspection, dimensional measurement, material verification and surface checks — with inspection reports provided per batch. Full details are agreed before production.
What is the difference between rapid and production tooling?
Rapid tooling uses softer materials and simplified construction for fast, low-cost validation runs (hundreds to low thousands of parts). Production tooling uses hardened steel for high-volume, long-life programs.
How long does injection mold making take?
Rapid tooling prototypes can be ready in days; production tooling typically takes several weeks depending on complexity, cavity count and steel grade. We confirm a detailed schedule with your quotation.
Do you provide DFM feedback?
Yes. Every quotation includes a design-for-manufacturing review: draft angles, wall thickness, gate and weld-line locations, tolerance recommendations and cost-saving suggestions — before any tooling is cut.
What file formats do you accept?
We accept STEP, IGES, STL, X_T and 2D drawings (PDF or DWG). A 3D model lets us quote most accurately; 2D drawings are used to confirm critical tolerances and specifications.
How do I get a quote?
Upload your 3D file (STEP, IGES, STL or X_T) through the quote page, or email it directly. Our engineers review the design, run a DFM check and send you a detailed quotation — usually within one business day.
Ready to Start Your PE Injection Molding?
Factory-direct pricing, ISO-certified quality and rapid lead times. Send your spec and volume, get a quote within 24 hours — DFM review included.