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Plastic
Machining

We offer custom-machined Plastic parts with short lead times and highly competitive pricing. A wide range of Plastic and surface finishing processes is available to meet your needs for high-quality prototypes and production parts.

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PP (Polypropylene)

Table of Contents

1. Basic Overview

PP stands for Polypropylene, a lightweight semi-crystalline thermoplastic polymer made from propylene monomers. It is one of the most widely used general-purpose plastics, affordable and versatile. There are three main types:

  • Homopolymer PP: High rigidity, good tensile strength, used for rigid containers and structural parts.
  • Copolymer PP (Random Copolymer): Transparent, better low-temperature toughness, ideal for food packaging.
  • Impact Copolymer PP: Excellent anti-crack performance under cold conditions, applied to auto parts and crates.

2. Key Advantages

  1. Ultra-light weight Density only 0.90–0.91 g/cm³, lighter than water, the lightest common commercial plastic.
  2. Low moisture absorption Hardly absorbs water, maintains stable dimensions in humid surroundings.
  3. Outstanding chemical resistance Resistant to dilute acids, alkalis, detergents, oils and most organic solvents; does not corrode easily.
  4. High heat tolerance for food use Heat deflection temperature around 100°C, microwave-safe, suitable for food containers and disposable tableware.
  5. Good fatigue & hinge resistance Unique “living hinge” property—thin PP strips can fold millions of times without breaking, widely used for flip lids of boxes.
  6. Easy processing & recyclable Suitable for injection molding, extrusion, blow molding, thermoforming; fully recyclable plastic marked with resin code 5.
  7. Non-toxic & food-safe Compliant with food contact standards, no harmful substances under normal temperature.

3. Disadvantages

  • Poor low-temperature performance: becomes brittle below -10℃ without modification.
  • Weak anti-UV capability: prone to aging, yellowing and cracking under long sunlight exposure.
  • Low surface hardness, easy to scratch.
  • Difficult to paint or glue without surface treatment.

4. Main Applications

Food & Daily Packaging

Microwave lunch boxes, beverage bottles, yogurt cups, plastic food crates, straws, storage containers.

Automotive Parts

Car bumpers, interior trim, battery casings, fan blades, luggage racks.

Industrial & Logistics

Plastic pallets, turnover boxes, injection molded housings, chemical storage tanks.

Consumer Goods

Foldable storage boxes, bottle flip caps, furniture, disposable masks non-woven fabric.

Medical Supplies

Disposable syringes, medical specimen tubes, surgical instrument packaging.

5. Basic Physical Parameters (Reference)

  • Density: 0.90–0.91 g/cm³
  • Melting point: 167°C
  • Continuous working temperature: -10℃ ~ 100℃
  • 24h water absorption: <0.01%

PP Material Parameter Table

Parameter NameReference Specifications
PriceCost varies with PP grade, component weight, machining complexity and order quantity
Delivery timePrototypes: 3–5 working days; Mass production: 7–12 working days
Wall thicknessMinimum 1.2 mm; optimal range 2–6 mm; Uneven thick walls easily cause shrinkage dents and deformation
toleranceStandard tolerance ±0.10 mm; Precision tolerance ±0.04–0.06 mm with extra fees, follows ISO 2768-m
Maximum part sizeCNC solid sheet/block/rod processing: 1200 × 1000 × 300 mm
Available PP Grades1. Homopolymer PP: high rigidity, good heat resistance2. Copolymer PP: excellent low-temperature impact resistance3. Glass fiber reinforced PP (10%/20%/30% GF): improved dimensional stability4. Food-grade PP: non-toxic, suitable for food contact parts5. Color modified PP: natural, black, blue and other custom colors6. Anti-static PP for electronic jigs

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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