polish
Used to remove slight knife lines and edge burrs to improve the consistency of touch and appearance; it is recommended to clarify the direction of the grain and the acceptable standards for the appearance.
Polypropylene (PP)
Polypropylene (PP) is known for its "chemical corrosion resistance, low density, and low cost," suitable for acid and alkali/chemical resistant plastic structural parts and container components.
Quote checklist: Upload your 3D model and, when available, a 2D drawing. Identify the required process, material, quantity, critical dimensions, finish, appearance standard, and target delivery date.
Key Material and Manufacturing Parameters
Engineering note: Values below are typical reference ranges. Final manufacturability, tolerances, material condition, surface finish, cost, and lead time depend on the drawing, geometry, quantity, and selected process.
Upload CAD files and mark critical features for an engineering review before production.
| Process | CNC machining (PP engineering plastics) |
|---|---|
| Color | True color (commonly milky white/translucent white); painting and marking solutions can be evaluated as needed |
| Dimensional tolerance | Conventional ±0.10 mm; high accuracy up to ±0.05 mm (related to size, structure and clamping, it is recommended to mark key tolerances) |
| Minimum wall thickness | General structure ≥1.0–1.5 mm; it is recommended to reinforce or thicken larger flat surfaces/long thin-walls to reduce the risk of deformation |
| Minimum aperture | Recommended ≥1.5–2.0 mm; please note or provide process requirements for deep holes/small holes (can be expanded/reamed) |
| Thread/Assembly | Can be tapped; for repeated disassembly and assembly, it is recommended to evaluate metal inserts or structural reinforcement (depending on the structure and stress) |
| Density | About 0.90 g/cm³ (lightweight advantage is obvious) |
| Tensile strength | About 25–35 MPa (affected by grade and crystallinity) |
| Elasticity/Toughness | Good toughness and good fatigue resistance; but rigidity and wear resistance may not be better than POM/PA |
| Service temperature | Short-term temperature resistance can be higher; long-term operating temperature is usually recommended to be in a lower range (please evaluate high temperature environments first) |
| Chemical resistance | It is more stable for most acid-base/aqueous media; for strongly oxidizing media/solvents, it needs to be confirmed according to the working conditions. |
| Electrical properties | Good insulation performance, suitable for insulating structural parts (specific dielectric indicators can be confirmed upon request) |
| Surface quality | It can achieve a delicate machined surface; if the requirements for the appearance surface are high, it is recommended to define the appearance surface and grain direction. |
| Typical lead time | Relevant to size, quantity, structural complexity and finishing; clear delivery and expedited options will be given after uploading the file |
| Finishing | Polishing, screen printing, laser engraving, painting |
Finishing
spray paint
Used to unify color and texture (matte/high gloss, etc.); it is recommended to provide reference pictures, color and appearance definitions.
screen printing
Suitable for logos, scales and other graphic information; it is recommended to provide vector files and location and size instructions.
Laser engraving
Suitable for durable marks such as serial numbers, QR codes, and functional logos; please note the content, location, and contrast requirements.
Why Choose Polypropylene (PP) (CNC Machining)
Lightweight
Low density, suitable for weight-sensitive structural parts and assemblies.
Chemical and water resistant
It is more stable in humid/water media and most acid and alkali environments, and is suitable for structural parts in related working conditions.
Good insulation performance
Suitable for applications such as electrical insulation structural parts, isolation gaskets and protective parts.
Logo and appearance can be enhanced
support Polishing, painting, screen printing and laser engraving, to facilitate clearer brand/functional identification and unified appearance.
Recommended Applications
- Corrosion/water resistant: Structural parts in contact with water, moisture or general acid-base media
- Lightweight: Weight-sensitive assemblies, inner shell structures and tooling parts
- insulation: Electrical isolation, protection parts, insulating structural parts
- Fixture fixture: Light load positioning, contact surface protection, anti-scratch tooling
It is not recommended to use it directly (it is recommended to change materials/processes)
- High rigidity/high load-bearing capacity: POM, PA, PC or metal are more recommended
- High temperature and long-term use: It is recommended to choose a more heat-resistant material system according to temperature/medium
- Strong appearance consistency and high adhesion: Spray painting/screen printing needs to evaluate adhesion and pre-treatment plan
- High wear resistance/low creep: Recommended to evaluate POM / filling modified materials or metal solutions
Design and DFM Guidelines
- Avoid large, ultra-thin surfaces: PP is relatively "soft", and thin walls and large flat surfaces are more likely to deform; it is recommended to reinforce, thicken or separate the design.
- Hole location and assembly: It is recommended to provide 2D markings and datums for key positioning holes/fitting holes; if necessary, reaming/reaming can be used to achieve a more stable fit.
- Force and thread: It is recommended to increase the support area and fillet transition in the load-bearing area; inserts or structural reinforcement can be evaluated after repeated disassembly and assembly.
- Bevels and edges: It is recommended to add chamfers/rounded corners to reduce the risk of burrs and bumps and improve assembly and feel.
- Appearance and logo: If painting/screen printing/laser engraving is required, please define the appearance surface and acceptable grain direction, and provide reference drawings or identification documents.