Plastic injection molding materials should be selected by application requirements such as load, heat, impact, chemical exposure, dimensional stability, surface finish, flexibility, flame rating, UV exposure and production cost. Common choices include ABS, PC, nylon, PP, PE, POM, PBT, TPE and PMMA.
Many molded part issues start with an unclear material choice. A resin that is easy to mold may not survive heat, load or chemical exposure, while a high-performance resin may increase cost or require design changes. A practical selection guide should connect part function with manufacturability.
Common Injection Molding Materials
| Cause / material | Typical sign or use | Buyer or engineering action |
|---|---|---|
| ABS | Housings, covers, consumer and industrial parts | Good processability and surface finish |
| PC | Impact-resistant and transparent components | Needs drying and stress-aware design |
| PA6 / PA66 nylon | Gears, brackets, wear parts and structural components | Check moisture absorption and glass fiber options |
| PP | Living hinges, clips, containers and lightweight parts | Good chemical resistance and fatigue behavior |
| POM / acetal | Precision gears, bushings and sliding parts | Good dimensional stability and wear resistance |
How to Choose a Plastic for Injection Molding
- Define the part’s load, temperature, chemical exposure and assembly method.
- Separate cosmetic requirements from functional requirements.
- Confirm whether the part needs stiffness, toughness, flexibility or wear resistance.
- Review shrinkage, moisture absorption and tolerance needs before tooling.
- Ask whether a prototype material can transition into production molding.
Material Selection by Application
| Material / case | Main concern | Selection note |
|---|---|---|
| Automotive under-hood parts | PA66 GF, PBT, PPS | Heat, chemical and dimensional stability matter |
| Electrical housings | ABS, PC-ABS, FR PC, PBT | Impact and flame rating may be required |
| Transparent covers | PC, PMMA | Balance impact strength and clarity |
| Flexible grips or seals | TPE, TPU | Hardness, bonding and compression set matter |
| Wear and sliding parts | POM, nylon, PTFE-filled grades | Friction, moisture and tolerance must be checked |
Buyer RFQ Details for Material Selection
For a useful review, send the 3D model or 2D drawing, resin grade or target material, part photos if the defect already exists, machine and mold information if available, expected annual volume, cosmetic requirements, critical dimensions, application environment and any inspection standard. Nylon Plastic can review the design, material and molding route before tooling or production changes are made.
Related Engineering Guides
Request a Quote or Design Review
Share your plastic part drawing, material requirements, production quantity and defect or DFM concern. Nylon Plastic can help compare material choices, tooling changes, process adjustments and production risks for custom molded plastic parts.
FAQ
What are common plastic injection molding materials?
Common injection molding materials include ABS, PC, PA6, PA66, PP, PE, POM, PBT, TPE, TPU and PMMA.
How should I choose a plastic for injection molding?
Start with the part function: load, heat, impact, chemical exposure, tolerance, surface finish, flexibility, flame rating, UV exposure and production cost.
Which injection molding material is best for housings?
ABS, PC-ABS and PC are common for housings, but the best choice depends on impact requirements, heat exposure, surface finish, flame rating and cost.
Can one prototype material always become the production material?
No. Prototype materials and production injection molding materials should be compared for mechanical behavior, shrinkage, tolerance, finish and long-term application conditions.
