Injection Molding Services
Custom injection molding for plastic prototypes and on-demand production parts in as fast as 1 day. Get your parts manufactured with precision and quality.
Injection Molding Processes
Plastic Injection Molding
High-quality plastic parts for mass production
- •Rapid prototyping
- •Production-grade materials
- •Complex geometries
- •High volume capability
Liquid Silicone Rubber Molding
Soft, durable silicone parts manufacturing
- •Medical grade materials
- •High temperature resistance
- •Biocompatibility
- •Flexible designs
Insert Molding
Combining metal inserts with plastic molding
- •Metal-plastic integration
- •Enhanced strength
- •Reduced assembly
- •Cost efficiency
Overmolding
Multi-material component manufacturing
- •Multiple materials
- •Enhanced grip
- •Improved aesthetics
- •Sealed components
Tooling Options
Prototyping
Objective
Need to validate designs at rapid speed. Need flexibility to iterate economically before production.
Best When
Completing design or material iterations, assessing cost or manufacturability trade-offs. Key focus is reducing design risk, increasing R&D productivity, and iterating faster to reduce time to market. Typical quantities <2,000
Mold Cavities
Single cavity mold
On-Demand Manufacturing
Objective
Have on-demand production needs with rapid delivery requirements.
Best When
Design is finalized and run-to-run part consistency is critical. Key focus is improving quality, reducing cost, and mitigating supply chain risk. Process development, qualification documentation, and mold capability information required.
Mold Cavities
Multi-cavity options
Technical Advantages
Industry-Leading Capabilities
Production Metrics
Technical Precision
Process Control
Material Performance
Applications
Medical
- •Surgical Instruments
- •Drug Delivery Devices
- •Diagnostic Equipment
- •Medical Housing
- •Disposable Components
Automotive
- •Interior Trim
- •Under-hood Components
- •Electrical Housings
- •Fluid Systems
- •Exterior Parts
Consumer Products
- •Electronic Housings
- •Appliance Parts
- •Packaging
- •Toys
- •Sports Equipment
Industrial
- •Machinery Parts
- •Electrical Enclosures
- •Fluid Handling
- •Safety Equipment
- •Tool Components
Electronics
- •Connectors
- •Device Housings
- •Circuit Board Components
- •Cable Management
- •Display Frames
Aerospace
- •Interior Components
- •Ducting Systems
- •Wire Management
- •Structural Parts
- •Lightweight Solutions
Materials
Wide Range of Materials for Every Application
Engineering Thermoplastics
- • ABS (Acrylonitrile Butadiene Styrene)
- • PC (Polycarbonate)
- • PA (Nylon)
- • POM (Acetal)
- • PBT (Polybutylene Terephthalate)
- • PEEK (Polyether Ether Ketone)
Commodity Thermoplastics
- • PP (Polypropylene)
- • PE (Polyethylene)
- • PS (Polystyrene)
- • PVC (Polyvinyl Chloride)
- • PMMA (Acrylic)
High Performance Plastics
- • PEI (Polyetherimide)
- • PSU (Polysulfone)
- • PPS (Polyphenylene Sulfide)
- • PAI (Polyamide-imide)
- • LCP (Liquid Crystal Polymer)
Elastomers
- • TPE (Thermoplastic Elastomer)
- • TPU (Thermoplastic Polyurethane)
- • TPV (Thermoplastic Vulcanizate)
- • LSR (Liquid Silicone Rubber)
- • Natural Rubber
Specialty Materials
- • Glass-Filled Polymers
- • Carbon Fiber Composites
- • Metal-Filled Plastics
- • Bio-Based Plastics
- • Conductive Polymers
Medical Grade Materials
- • USP Class VI Plastics
- • ISO 10993 Compliant Materials
- • Medical Grade Silicones
- • Biocompatible ABS
- • Medical Grade PC
Frequently Asked Questions
How much does injection molding cost?
Due to the initial capital investment in tooling, injection molding makes sense for higher volumes of parts. Our mold cost starts at $1,495 and will vary depending on part geometry and complexity. Other factors that will impact injection molding cost are lead times and material.
Do you do production molding?
Yes, we offer a production tooling option called on-demand manufacturing. This tooling option provides several benefits: lower piece part price, multi-cavity capabilities, guaranteed tooling for the life of the project (we will cut a new tool if it wears out), and first article inspections.
What are your tolerances for molded parts?
In most cases, we can maintain a machining tolerance of ±0.003 in. (0.08mm) with an included resin tolerance that can be greater than but no less than ±0.002 in./in. (0.002mm/mm).
What is the maximum part size for injection molding?
The largest size we can support with plastic injection molding is 18.9 in. x 29.6 in. x 8 in. (480mm x 751mm x 203mm).
Injection molding services hub—what we offer
This hub covers thermoplastic injection, insert molding, overmolding, and LSR paths from aluminum bridge tools through production intent.
Use child pages for process-specific DFM; use this page to pick the right process and RFQ packaging.
Partsproto molds in China for overseas buyers—tooling ownership, sample approval, and export logistics are part of the quote conversation.
- → Plastic parts needing repeatable geometry beyond machining economics
- → Insert / overmold / LSR hybrids (see child services)
- → Pilot tools before steel commitment
- → Export programs needing clear tool + piece-price breaks
How an injection molding program runs
Process select
Straight inject vs insert vs overmold vs LSR based on function.
DFM & resin
Walls, gates, sinks, and material grade locked with the quote.
Tooling
Aluminum or steel as volume justifies; T1 samples.
FA & tweaks
Dimensional and cosmetic approval before volume.
Production & ship
Repeating lots, packing, and overseas freight.
DFM tips before you RFQ molding
- •Uniform walls beat heroic ribs—send a sectioned view if unsure.
- •Call cosmetic class (A-side) and gate vestige limits early.
- •If inserts or soft-touch are required, start on the insert/overmold pages.
- •Resin + color + additives (GF, FR, UV) change shrinkage—name them.
- •Annual volume estimate decides aluminum vs steel tooling economics.
Inspection & QC
- ✓T1 dimensional report against critical dims.
- ✓Cosmetic criteria agreed before volume.
- ✓Material certs / lot traceability when ordered.
- ✓Optional FAIR for regulated buyers.
- ✓Incoming photos for overseas warehouses on request.
Lead time & batch sizing
Aluminum tools for simple parts often support first samples in a few weeks after DFM freeze; complex tools and steel take longer. Piece-price drops with multi-cavity and volume. Ask for tool cost + 100 / 1,000 / 10,000 piece breaks. Child processes (insert, overmold, LSR) have their own schedules.
Injection molding hub FAQ
Aluminum vs steel tools?
Aluminum for pilots and many mid-volume export runs; steel for high volume or abrasive resins. We recommend on the quote.
Can you mold and machine?
Yes—secondary CNC on molded parts is common for threads or critical fits.
Where do I go for insert or LSR?
Use the Insert Molding, Overmolding, or LSR child pages for process-specific DFM.
Are you a US domestic molder?
No. Partsproto is China-based export manufacturing for overseas buyers.
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