chamfer
Used to remove sharp edges, improve assembly feel and reduce stress concentration; if there are specified chamfer dimensions or critical edges, please mark them in the 2D drawing.
Polypropylene (PP)
Polypropylene (PP) is a common general-purpose plastic with excellent chemical corrosion resistance, good fatigue resistance, and relatively low material density.
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 | Injection Molding |
|---|---|
| Material | PP (polypropylene) |
| Accuracy | ±0.2 mm |
| Minimum wall thickness | 1.0mm |
| Service temperature | 300-600℃ |
| Tensile strength | 450-1100MPa |
| Density | 7.7-8.5 g/cm³ |
| Appearance points | Common appearance features of injection molded parts include gate marks, weld lines, ejector pin marks and slight sink marks; it is recommended that the appearance surface be marked in drawings or notes, and the acceptance standards be stated (which is more conducive to quote and process plan determination). |
| Structural points | It is recommended that the wall thickness be as uniform as possible to avoid sudden changes in thickness; attention should be paid to the risk of sink marks and warpage at ribs, columns, and large flat surfaces; demoulding slope, rounded corner transition, and avoidance of undercuts can help improve manufacturability and yield. |
| Finishing | Chamfering, grinding, bonding, screen printing, laser engraving |
| Quote and lead time | Related to structural complexity, quantity, appearance requirements and finishing; a clear quote and delivery period will be given after uploading the file |
Finishing
polish
Used to improve the feel and appearance of local edges, mold lines or assembly interference locations; it is recommended to define standards and key areas in advance for the appearance.
bonding
Used for component assembly or local structural reinforcement; please note the bonding location, strength requirements and whether bonding traces are allowed to be exposed.
screen printing
Suitable for logos, scales and other graphic information; it is recommended to provide vector files and position and size instructions, and clarify the direction of the appearance.
Laser engraving
Suitable for serial numbers, QR codes, durable logos, etc.; please provide content, size, location and clarity requirements (confirm with samples first if necessary).
Why Choose PP (Injection Molding)
Cost and efficiency balance
Suitable for batch manufacturing of general plastic parts, it is easier to strike a balance between cost, lead time and manufacturability.
Corrosion resistance and wide application
It has certain tolerance to a variety of common media and is suitable for general structural parts and shell parts in many industries.
Manufacturability friendly
Reasonable wall thickness, rib position and demoulding design help to stabilize molding; suitable for batch delivery scenarios that pursue yield and consistency.
Secondary process support
Supports chamfering, grinding, bonding, screen printing and laser engraving to facilitate assembly and marking requirements.
Recommended Applications
- low cost common parts: Bulk parts such as structural parts, shells, brackets, etc.
- Corrosion resistance requirements: General applications that require a certain degree of media resistance
- batch consistency: Mass production projects that want stable delivery and controllable yields
- Need identification: Screen printing/laser engraving for model, scale, QR code and other information
It is not recommended to use it directly (it is recommended to change materials/processes)
- Extremely high temperature resistance or high strength: It is recommended to evaluate higher performance engineering plastics or other material systems
- Ultra-high appearance standards: Gate marks, weld lines, ejector pin marks and shrinkage marks need to be strictly controlled. It is recommended to confirm the appearance standard sample first.
- Extremely thin-wall/extremely large plane: There is a risk of filling and warping. It is recommended to do DFM and structural optimization first.
- Complex undercut structure: It may increase the complexity and cost of the mold. It is recommended to optimize the structure or use a detachable structure.
Design and DFM Guidelines
- Uniform wall thickness: Try to keep the wall thickness as consistent as possible to avoid sudden changes in thickness and reduce the risk of sink marks and warping.
- Draft slope and undercut: Reserve a reasonable draft angle for the exterior surface and deep cavity structure; try to avoid undercuts, and confirm the core pulling/slider plan in advance if necessary.
- Rib position and column position: The ribs are used to enhance rigidity, but excessive thickness must be avoided to cause sink marks; it is recommended to make rounded transitions in the column and screw areas and pay attention to ejection and stress concentration.
- Appearance surface definition: Please mark the display side/non-display side of the cosmetic parts, and indicate whether gate marks, weld lines and ejector pin marks are allowed; the clearer the clarity, the more stable the quote and delivery will be.
- Assembly and tolerances: It is recommended to provide 2D annotations (PDF/DWG) for key hole positions, positioning surfaces and matching relationships, and state "assembly first/precision first" in the remarks.