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Plastic
Machining

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Polyethylene (PE)

Table of Contents

Basic Definition

Polyethylene, abbreviated as PE, is the simplest thermoplastic polymer made by polymerizing ethylene monomers. It belongs to the polyolefin family and is one of the most widely used plastics worldwide due to its low cost, lightweight and outstanding processability.

Main Classifications & Features

(1) LDPE – Low-Density Polyethylene

  • Low crystallinity, soft and flexible, slightly transparent
  • Excellent toughness at low temperatures, good moisture barrier
  • Common uses: plastic wrap, squeeze bottles, disposable bags, coating film

(2) HDPE – High-Density Polyethylene

  • High density, rigid, hard, opaque, high tensile strength
  • Resistant to chemicals, oil and high temperature
  • Common uses: plastic buckets, water pipes, fuel tanks, shopping bags, cutting boards

(3) LLDPE – Linear Low-Density Polyethylene

  • Linear molecular structure, higher impact resistance than LDPE
  • Good anti-tear performance, blendable with other PE grades
  • Common uses: stretch wrap film, agricultural mulch film, flexible containers

(4) UHMWPE – Ultra-High-Molecular-Weight Polyethylene

  • Extremely long molecular chains, ultra-high wear resistance and self-lubrication
  • Shock-absorbent, anti-corrosion, biocompatible
  • Common uses: mechanical sliding parts, artificial joint components, mining lining plates

Core Advantages of PE Material

  1. Light weight with low density, floats in water
  2. Excellent water and moisture resistance, no water absorption
  3. Inert to most acids, alkalis and organic solvents
  4. Non-toxic and odorless, food-safe for food packaging
  5. Good low-temperature resistance; does not crack under freezing conditions
  6. Easy to extrude, injection mold, blow mold and thermoform
  7. Fully recyclable, marked with recycling symbol number 2 (HDPE) / 4 (LDPE)

Disadvantages

  • Low heat resistance: softens easily above 80–120°C, cannot withstand high-temperature sterilization
  • Poor UV resistance; will crack and turn brittle under long-term sunlight without UV stabilizers
  • Low surface polarity, hard to print or glue without surface treatment
  • Susceptible to slow creep under long-term constant load

Wide Application Fields

  • Packaging: plastic films, bottles, food containers, logistics packaging
  • Construction: water supply/drainage pipes, waterproof geomembranes
  • Daily goods: plastic basins, storage boxes, disposable tableware
  • Industry: wear-resistant liners, chemical storage tanks, cable insulation layers
  • Medical & sports: UHMWPE artificial bone parts, protective gear, skateboard sliding surfaces

Brief Chemical Property Note

PE consists only of carbon and hydrogen atoms, with no polar functional groups in its molecular chain. This chemical inertness gives it strong corrosion resistance but also leads to weak adhesion and printing difficulty.

PE Material Parameter Sheet

Parameter NameReference Specifications
PriceDetermined by raw material grade, part weight, machining complexity and order quantity
Delivery timePrototypes: 3–5 working days; Mass production: 7–12 working days
Wall thicknessMinimum 1.2 mm; ideal range 1.8–6 mm; thin walls prone to deformation during processing
toleranceStandard tolerance ±0.10 mm; Precision tolerance ±0.04–0.06 mm (extra cost), ISO 2768-m standard
Maximum part sizeCNC solid block/sheet processing: 1200 × 1000 × 300 mm
Available PE Grades1. LDPE Low Density Polyethylene (soft, flexible, good chemical resistance)2. HDPE High Density Polyethylene (high rigidity, wear-resistant, most widely used)3. UHMWPE Ultra-high molecular weight PE (ultra-low friction, impact resistant, wear-resistant lining parts)4. Anti-static PE5. Color-modified PE (black, blue, natural white)

Frequently Asked Questions

  To shorten the delivery cycle of CNC workpieces, we start with the documents submitted by customers. Please provide complete and clear 2D drawings, 3D models, dimensional tolerances, surface requirements, and processing specifications, and specify special materials, surface treatments, and assembly standards. Avoid incomplete drawings, ambiguous markings, and version confusion.
Complete documents enable direct programming, order splitting, and production scheduling, cutting down repeated confirmation and supplementary work. Customers are also advised to finalize order quantity, delivery schedule, and special requirements in advance. Eliminating repeated communication and rework risks at the source accelerates the whole process and effectively shortens the overall lead time.

  With 12 years of expertise in CNC machining, YUEYI stands out from other manufacturers and middlemen. Our factory covers an area of 4,000 mu and is equipped with over 100 processing machines. We achieve a machining precision up to 0.001 mm, capable of producing high-precision components. Backed by standardized production management, our on-time delivery rate reaches 98%. As a direct manufacturer with full in-house production capacity, we control every production link without outsourcing. We deliver consistent quality, outstanding precision and reliable lead time, making us your trustworthy partner for CNC precision machining.

  Fast delivery is one of our key strengths. For 3D printing orders, we support delivery within 3 days, ideal for rapid prototyping and urgent sample requests. For regular CNC machining projects, the standard lead time is around 3 weeks.
We manage the whole process in-house, from drawing review and process planning to production, quality inspection, and shipment, with no intermediate links. Equipped with complete facilities and an experienced team, we reliably fulfill both urgent sample orders and mass production. We guarantee stable lead time and consistent quality to keep your projects on track.

  We offer a full range of surface treatments with rich color options. Our services include anodizing, powder coating, spray painting, electroplating, wire drawing, sandblasting, and polishing. Anodizing features various colors and strong anti-corrosion performance for aluminum parts. Powder coating and spray painting come with extensive color selections and durable coatings. Electroplating enhances luster and rust resistance. Wire drawing creates fine linear textures, while sandblasting delivers a matte finish. Polishing achieves a bright and smooth surface. All finishes can be customized in colors and styles to match your application needs.

  Yes, we fully provide complete material certificates and relevant test reports for all CNC-machined parts. All raw materials are sourced from qualified suppliers with authentic documentation. We can offer material certifications, dimension inspection reports, and quality test records upon request. Every product is strictly inspected before delivery. These official documents fully guarantee material compliance and product quality, supporting your quality audit and project requirements.

  We take strict quality control measures in advance to prevent non-conforming products. Every workpiece is fully inspected dimensionally and visually during and after production to ensure full compliance with design drawings and specifications.
In the rare case of non-compliant items, we will take immediate responsibility. We will promptly confirm the issues with you, then arrange free rework or remanufacturing as required. All related costs will be borne by us. We will also analyze the root cause to optimize our processes and avoid similar problems recurring. Our goal is to deliver qualified products steadily and safeguard your project progress.

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