Mechanical Needs
Impact, stiffness, fatigue, wear, flexibility and load direction.
Injection Molding Materials
Material Selection Based on Function, Environment and Moldability
Plastic selection affects performance, tooling, shrinkage, cycle time, appearance and long-term supply. Compare the real product requirement before choosing a resin by name or price.
Selection Framework
Start with the product requirement, not the resin list
A practical material review connects application performance with molding behavior and commercial constraints.
Environment
Temperature, chemicals, UV, moisture, sterilization and outdoor exposure.
Part & Tooling
Wall thickness, shrinkage, warpage, surface finish, glass fiber and mold wear.
Commercial Fit
Availability, approved grade, color, annual volume, unit cost and supply continuity.
Common Material Directions
Compare strengths and manufacturing considerations
This is a starting point. Final selection should use the actual grade, application and test requirements.
ABS
Balanced appearance, toughness and processing cost for housings and consumer products.
- Watch
- Heat, UV, chemicals, flame requirements and cosmetic flow marks.
PP
Low density and chemical resistance for containers, living hinges and functional parts.
- Watch
- Shrinkage, stiffness, paint or bonding, warpage and low-temperature impact.
PC & PC/ABS
Used for tough housings, transparent parts and applications requiring higher impact resistance.
- Watch
- Drying, stress, chemical sensitivity, flame grade and surface requirements.
PA / Nylon
Strength, wear resistance and engineering performance for structural and moving parts.
- Watch
- Moisture, dimensional change, glass-fiber warp and mold wear.
POM / Acetal
Dimensional stability and low friction for gears, clips, sliders and precision components.
- Watch
- Shrinkage, gate design, weld strength, odor and resin-grade compatibility.
TPU / TPE
Flexible and soft-touch options for seals, grips, wear parts and overmolding.
- Watch
- Hardness, bonding, drying, ejection, surface and tooling shut-offs.
PPSU / PEI / PEEK
Engineering resins for heat, chemicals, sterilization or demanding mechanical requirements.
- Watch
- Grade approval, drying, mold temperature, steel, process window and cost.
PMMA & Transparent PC
Options for lenses, light guides, covers and high-appearance transparent components.
- Watch
- Polishing, contamination, flow, stress, scratches and packaging.
Glass-Filled Resins
Higher stiffness and strength for structural parts using PA, PBT, PPS or other matrices.
- Watch
- Fiber orientation, anisotropic shrinkage, warp, surface, gate and tooling wear.
Common Questions
Material selection FAQ
Can you choose the material for us?
We can recommend practical directions based on your requirements. The buyer should approve the final grade against regulatory, safety and application tests.
Why does the exact grade matter?
Grades can differ in glass content, impact modification, flame rating, UV stability, color and processing behavior even within the same resin family.
Can recycled content be used?
It depends on performance, appearance, compliance and supply consistency. The percentage and source should be controlled and approved.
Can material changes reduce cost?
Sometimes, but cost should be evaluated together with defect risk, cycle time, part weight, assembly and product life.