chamfer
It is used to remove sharp edges and improve assembly feel and safety; chamfering of exterior parts can also improve the look and feel of "white edges/chips".
Polypropylene (PP)
Polypropylene (PP) effect resin is used in vacuum casting replication mainly to meet the functional verification needs of "chemical resistance, lighterness, and certain toughness," suitable for containers, corrosion-resistant structural parts, and thin-walled parts that require repeated bending.
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 | Vacuum casting (PP type molding material system) |
|---|---|
| Material name | Polypropylene (PP) |
| Dimensional tolerance | Routine evaluation based on structure and size; it is recommended to provide 2D markings for critical holes/mating surfaces and note "critical dimensions" |
| Minimum wall thickness | Recommended ≥ 1.0 mm; thin-walled areas need to be evaluated for casting filling and deformation risks |
| Minimum aperture | Recommended ≥ 1.5–2.0 mm; it is recommended to reserve a margin for key assembly holes and repair the holes twice. |
| Appearance points | There is a probability of parting line/gate position/exhaust mark; please define the appearance in the remarks, we can prioritize the optimization of placement and trimming standards |
| Resilience orientation | It is biased toward the "PP feel/toughness" direction and is suitable for trial assembly and light load function verification (extreme impact/high temperature long-term working conditions need to be evaluated separately) |
| Service temperature | Evaluate based on material system and working conditions; if it is close to a heat source or requires high temperature testing, please indicate the temperature and duration. |
| Typical uses | Appearance prototype, small batch verification, trial assembly parts, preliminary structural testing |
| Finishing | Chamfering, grinding, bonding, screen printing, laser engraving |
| Typical lead time | Related to structural complexity, quantity, and finishing; clear delivery and expedited options will be given after uploading the file |
Finishing
polish
Used to control parting line/gate trimming marks; it is recommended to define acceptance criteria and key processing areas in advance for exterior surfaces.
bonding
Suitable for over-long/large parts to be assembled after separate molding; it is recommended to reserve the positioning structure and bonding surface width during the design stage.
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 serial numbers, QR codes and wear-resistant logos; if you are sensitive to color contrast, it is recommended to make a sample first to confirm the effect.
Why choose polypropylene-PP (vacuum casting)
Smaller batches are more cost-effective
Multiple samples can be obtained without steel molds, which is suitable for small batch verification, pre-trial production review and multi-department simultaneous confirmation.
Closer to “PP toughness orientation”
Compared with the pure appearance resin solution, it is more suitable for trial assembly, feel evaluation and initial test of light load function.
Flexible lead time
Suitable for multi-version iterations and frequent engineering changes; it is more stable to confirm the first piece first and then increase the volume.
Finishing and labeling friendly
Supports chamfering, grinding, bonding, screen printing and laser engraving to facilitate clearer appearance and logo implementation.
Recommended Applications
- Small batch verification: Parallel review of multiple pieces, trial assembly, and phased trial production
- Appearance + certain toughness: Need a sample that is closer to the feel of PP
- Multi-Version Iteration: Want to control costs and lead times during the frequent revision stage
- Need identification: Screen printing/laser engraving to realize logo, scale and serial number
It is not recommended to use it directly (it is recommended to change materials/processes)
- High load and long-term use: Suggested injection molding/machining and other terminal process routes
- Tight tolerances/high consistency: Recommend injection molding or CNC, and cooperate with mass production level inspection
- Continuous high temperature conditions: Please indicate the temperature and duration. If necessary, choose a heat-resistant system or other materials.
- Extreme shock/fatigue: It needs to be evaluated based on the actual structure and working conditions. If necessary, it will be changed to mass production material verification.
Design and DFM Guidelines
- Uniform wall thickness: Try to avoid sudden changes in thickness; if necessary, replace local thickening with reinforcement to reduce the risk of sink marks and deformation.
- Parting Line and Exterior Surface: Please define the appearance surface/critical surface; we will prioritize parting and gate planning to reduce critical surface traces.
- Holes and fits: It is recommended that key holes/positioning surfaces be marked in 2D; for high fitting accuracy, allowance can be made for secondary drilling after reserving a margin.
- Buckle and thin-wall: It is recommended to add fillets to the buckle roots and control strain; thin-walled and long cantilevers need to be evaluated for mold filling and warpage.
- Parts and bonding: Large/complex parts can be split into multiple molds and then bonded. It is recommended to reserve positioning steps and sufficient bonding surface width.