Frequently Asked Questions: Injection Molding Service

1. What is injection molding and how does it work?

Injection molding is a manufacturing process used to produce parts by injecting molten material—typically thermoplastic or thermoset polymers—into a custom-designed mold cavity. The material is heated until it becomes liquid, injected under high pressure into the mold, cooled until it solidifies, and then ejected as a finished part. This process is ideal for producing high volumes of identical, precision parts with consistent quality.

2. What materials can be used in injection molding?

We work with a wide range of materials to suit different applications, including:

• Thermoplastics: ABS, Polypropylene (PP), Polyethylene (PE), Polycarbonate (PC), Nylon (PA), POM, PEEK
• Thermoplastic Elastomers (TPE/TPU): For flexible, rubber-like parts
• Engineering plastics: Glass-filled or carbon-filled resins for added strength
• Bioplastics and recycled materials: For eco-friendly applications

Our team can help you select the optimal material based on your part’s mechanical, thermal, and aesthetic requirements.

3. How much does injection molding cost?

The cost of injection molding depends on several factors:

• Mold (tooling) cost: Typically the largest upfront expense, ranging from a few thousand to tens of thousands of dollars depending on complexity, size, and cavity count
• Part cost: Decreases significantly with higher production volumes
• Material selection: Specialty resins cost more than standard plastics
• Part complexity: Geometry, tolerances, and finishing requirements

While the initial tooling investment can be high, injection molding offers an excellent per-unit cost for medium to high-volume production runs.

4. What is the typical turnaround time?

Lead times vary by project scope:

• Tooling fabrication: 2–6 weeks for standard molds; 1–2 weeks for prototype or aluminum molds
• First article samples (T1): Available shortly after mold completion
• Production runs: Typically 1–4 weeks depending on order quantity

We also offer rapid tooling services for projects with tight deadlines, with turnaround as fast as 10–15 business days.

5. What is the minimum order quantity (MOQ)?

There is no strict MOQ for our injection molding service, but the process is most cost-effective for orders of 500 units or more. For smaller batches or prototyping, we recommend our rapid prototyping services or low-volume injection molding using aluminum tooling, which reduces upfront tooling costs.

6. What design considerations should I keep in mind for injection molding?

To ensure successful molding and reduce costs, consider these key design principles:

• Uniform wall thickness: Prevents warping, sink marks, and uneven cooling
• Draft angles: Add 1°–3° on vertical surfaces to allow easy ejection
• Proper rib design: Keep ribs at 50–60% of the adjacent wall thickness
• Rounded corners: Avoid sharp edges to reduce stress concentration
• Avoid undercuts: They increase tooling complexity and cost

Our engineering team provides free Design for Manufacturability (DFM) reviews to optimize your part for cost, quality, and performance before production begins.