Injection Molding
Materials
for Production Plastic Parts
Compare performance, appearance, temperature resistance, wear properties, cost, and production suitability across engineering plastics to optimize your injection molding project.
The right plastic material supports part performance, moldability, appearance, and cost control.
Common Plastics Used in Injection Molding
Quick reference guide to the most popular thermoplastic materials for injection molding applications
ABS
Tough, impact-resistant plastic for housings and covers
PC
Crystal clear, high-temperature engineering plastic
PA6 / PA66
Strong nylon for mechanical and wear parts
POM
Precision acetal for gears and moving parts
PP
Chemical-resistant polypropylene for containers
PE
Flexible polyethylene for consumer products
TPU / TPE
Flexible elastomers for soft-touch components
PEEK / PPS
High-performance plastics for extreme conditions
PMMA
Crystal-clear acrylic for optical applications
Explore Injection Molding Materials
Detailed material properties, applications, and engineering considerations for your injection molding project
ABS Plastic
Acrylonitrile Butadiene Styrene
Key Properties
Good impact strength, dimensional stability, easy to process
Strengths
- • Excellent toughness and impact resistance
- • Good surface finish and paintability
- • Cost-effective for large volumes
Limitations
Limited temperature resistance (80°C), UV degradation
Common Applications
Electronic housings, automotive trim, consumer appliances
Polycarbonate
Engineering Thermoplastic
Key Properties
High temperature resistance, optical clarity, flame retardant
Strengths
- • Excellent transparency and clarity
- • High heat resistance (up to 140°C)
- • Superior impact strength
Limitations
Sensitive to stress cracking, higher cost than ABS
Common Applications
LED lenses, safety shields, medical devices, electronics
PA6 / PA66
Nylon Engineering Plastic
Key Properties
High strength, wear resistance, chemical resistance
Strengths
- • Excellent mechanical strength
- • Superior wear and abrasion resistance
- • Good chemical compatibility
Limitations
Moisture absorption, dimensional changes with humidity
Common Applications
Gears, bearings, automotive parts, industrial components
POM Acetal
Polyoxymethylene
Key Properties
Excellent dimensional stability, low friction, precision molding
Strengths
- • Outstanding dimensional precision
- • Low friction and wear
- • Excellent fatigue resistance
Limitations
Limited acid resistance, moderate temperature range
Common Applications
Precision gears, springs, fasteners, mechanical parts
Polypropylene
Versatile Thermoplastic
Key Properties
Chemical resistance, flexibility, low density, recyclable
Strengths
- • Excellent chemical resistance
- • Low cost and lightweight
- • Good fatigue resistance
Limitations
Poor UV resistance, limited temperature range
Common Applications
Containers, packaging, automotive interior, medical devices
TPU / TPE
Flexible Elastomers
Key Properties
Rubber-like flexibility, soft touch, excellent elasticity
Strengths
- • Exceptional flexibility and elasticity
- • Soft-touch surface feel
- • Good tear and abrasion resistance
Limitations
Higher processing temperatures, limited rigidity
Common Applications
Gaskets, grips, flexible connectors, protective covers
Compare Plastic Materials
for Injection Molding
Side-by-side comparison of key properties to help you select the optimal material for your application
| Material | Toughness | Rigidity | Heat Resistance | Chemical Resistance | Appearance | Cost Level |
|---|---|---|---|---|---|---|
| ABS |
|
|
80°C |
|
Opaque, Paintable | Low |
| PC |
|
|
140°C |
|
Crystal Clear | Medium |
| PA6/PA66 |
|
|
120°C |
|
Natural, Colorable | Medium |
| POM |
|
|
100°C |
|
Smooth, Natural | Medium |
| PP |
|
|
100°C |
|
Natural, Colorable | Low |
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Choose Injection Molding Materials
by Application
Material recommendations based on specific use cases and performance requirements
Housings and Covers
Electronic enclosures, device housings, and protective covers requiring impact resistance and surface quality.
Wear Parts
Gears, bearings, bushings, and mechanical components subjected to friction and wear.
Transparent Parts
Optical lenses, light guides, display covers, and any application requiring crystal clarity.
Flexible Components
Gaskets, seals, flexible connectors, and soft-touch grips requiring elasticity and comfort.
Electrical Insulation Parts
Connectors, terminal blocks, and electrical components requiring insulation properties and flame resistance.
High-Temperature Parts
Components exposed to elevated temperatures in automotive, aerospace, and industrial applications.
How Material Choice Affects
Injection Molding
Understanding the relationship between material properties and manufacturing success from prototyping to mass production
Mold Design Impact
Material flow properties determine gate location, runner design, and cooling channel layout.
- • High-flow materials require smaller gates
- • Crystalline plastics need controlled cooling
- • Glass-filled grades increase wear on mold
Shrinkage & Warpage
Different materials exhibit varying shrinkage rates affecting dimensional accuracy and part geometry.
- • PP: 1.5-2.5% shrinkage (high)
- • ABS: 0.4-0.8% shrinkage (low)
- • Crystalline materials show directional shrinkage
Surface Texture
Material characteristics determine achievable surface finishes and texture reproduction capability.
- • ABS excels at smooth, paintable surfaces
- • PC enables high-gloss transparent finishes
- • Glass-filled materials may show fiber patterns
Dimensional Consistency
Material stability affects part-to-part variation and long-term dimensional retention.
- • POM offers excellent dimensional stability
- • Hygroscopic materials change with moisture
- • Reinforced grades improve consistency
Cycle Time Impact
Processing characteristics directly affect production speed and manufacturing cost.
- • Fast-cooling materials reduce cycle time
- • Crystalline plastics require longer cooling
- • Wall thickness affects cooling requirements
Tooling & Production Cost
Material selection influences both upfront tooling investment and ongoing production economics.
- • Abrasive materials increase tooling wear
- • Processing temperature affects energy costs
- • Scrap rates vary by material difficulty
Prototyping to Mass Production Logic
Material decisions made during prototyping phase directly impact scalability, cost, and quality in volume production. Our DFM analysis ensures your material choice supports both development speed and manufacturing efficiency.
Material Appearance and
Mold Finish Options
How plastic material properties and mold surface treatments combine to achieve your desired part appearance
Surface Finish Capabilities
Glossy Finish
Mirror-like surface with high reflectivity and smooth tactile feel
Matte Finish
Low-gloss surface that reduces fingerprints and provides premium feel
Textured Finish
Leather, wood grain, or geometric patterns for enhanced grip and aesthetics
Transparency
Crystal clear to translucent appearances for optical and aesthetic applications
Surface Finish Examples
Various mold finishes applied to different plastic materials showing appearance capabilities
SPI Standards
A1-D3 finish grades
EDM Texture
Custom patterns
Colorability by Material
Excellent Coloring
Limited Colors
Natural/Clear
Custom color matching available with Pantone or RAL color systems
Discuss Color Options
Common Questions About
Injection Molding Materials
Expert answers to help you make informed material selection decisions
What's the best plastic material for electronic housings?
For most electronic housings, ABS is the preferred choice due to its excellent balance of properties:
- • Good impact resistance protects internal components
- • Excellent surface finish for professional appearance
- • Easy to paint or apply surface treatments
- • Cost-effective for volume production
- • Good dimensional stability
For applications requiring higher temperature resistance or flame retardancy, consider PC (Polycarbonate) or flame-retardant ABS grades.
ABS vs PC: Which should I choose for my project?
The choice between ABS and PC depends on your specific requirements:
Choose ABS when:
- • Cost is a primary concern
- • Operating temperature < 80°C
- • You need excellent paintability
- • Good impact strength is sufficient
- • Transparency is not required
Choose PC when:
- • High temperature resistance needed (up to 140°C)
- • Crystal clear transparency required
- • Maximum impact strength is critical
- • Flame retardancy is important
- • Premium performance justifies higher cost
POM vs Nylon (PA6/PA66) for mechanical parts?
Both are excellent engineering plastics, but each has distinct advantages:
POM (Acetal) excels at:
- • Dimensional precision and stability
- • Low friction and wear
- • Excellent fatigue resistance
- • Consistent performance in dry conditions
- • Smooth surface finish
Nylon (PA6/PA66) excels at:
- • Higher strength and toughness
- • Better chemical resistance
- • Superior high-temperature performance
- • Excellent wear resistance under load
- • Better for reinforced grades
Recommendation: Choose POM for precision parts like gears and springs. Choose Nylon for high-load structural components.
Which materials work best for transparent parts?
For transparent injection molded parts, consider these options in order of optical quality:
PMMA (Acrylic)
Exceptional optical clarity, UV resistance, scratch resistance. Best for optical applications.
PC (Polycarbonate)
Excellent clarity with superior impact strength. Ideal when toughness is critical.
Clear PP
Good clarity at lower cost, but limited temperature resistance and impact strength.
Should I use different materials for prototypes vs production?
Generally, it's best to use the same material for both prototypes and production to ensure accurate testing and validation. However, there are some considerations:
Prototype Phase Considerations:
- • Use production-grade material whenever possible
- • Natural (uncolored) resin is often more readily available
- • Standard grades before moving to specialized formulations
- • Consider lead times for specialty materials
Production Transition:
- • Validate any material changes with testing
- • Consider colored or UV-stabilized grades
- • Optimize for cost and supply chain reliability
- • Document any processing parameter changes
What are the best heat-resistant plastics for injection molding?
Heat resistance requirements vary significantly. Here's a temperature-based guide:
80-100°C
Standard applications
120-140°C
Automotive, industrial
150-200°C
High-performance applications
200-250°C
Aerospace, extreme conditions
Note: Higher temperature materials typically come with increased cost and processing complexity.
Related Resources
Explore more injection molding topics and manufacturing insights
Injection Molding Process Overview
Complete guide to the injection molding process, from mold design to quality control.
Read MoreDesign for Manufacturing Guidelines
Essential DFM principles to optimize your part design for injection molding success.
Learn MoreInjection Molding Cost Optimization
Strategies to reduce tooling and production costs while maintaining quality standards.
ExploreSurface Finish Standards
Understanding SPI surface finish standards and their impact on part appearance and cost.
View GuideQuality Control Best Practices
ISO-certified quality control processes to ensure consistent part quality in production.
Learn MoreSuccess Stories & Case Studies
Real-world examples of successful injection molding projects across various industries.
View Cases
Get Expert Material Advice
for Your Injection Molding Project
Share your product requirements, intended use, quantity, appearance needs, assembly requirements, and operating environment. Our material engineers will recommend the optimal plastic material and provide detailed DFM analysis.