ISO 9001:2015 Certified

Prototype Injection Molding

Create production-quality molded parts for geometry validation, functional testing, and low-volume production — delivered in as few as 10 business days with aluminum rapid tooling.

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Injection molding machine producing ABS plastic housing parts

10 Days

Fastest Lead Time

±0.005mm

Mold Tolerance

50–1000T

Machine Range

1–10K

Parts Per Mold

Why KUSLA

Prototype Injection Molding With KUSLA

KUSLA Prototype has years of experience in prototype injection molding and rapid tooling. We reduce cost and lead time by using aluminum or softer steels such as P20 for mold tooling — cutting tooling costs by up to 25% and cycle times by 30–40% compared to hardened production molds.

Our service covers single prototypes through low-volume production runs up to 10,000 units. Every part is molded with production-grade resin so your prototypes behave exactly like final production parts in mechanical, thermal, and chemical testing.

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Aluminum prototype mold tooling with CNC-machined cavity and core halves

Multi-cavity plastic injection molded parts in ABS and polycarbonate

Plastic Injection Molding

Mold parts using all common thermoplastics (ABS, PC, PP, Nylon, PEEK), thermosets, and liquid silicone rubber with production-grade material properties.

Overmolded handle with soft-touch TPE grip layer

Overmolding

Multi-step process that bonds a second material layer — typically a soft-touch elastomer — over a rigid substrate for improved ergonomics and sealing.

Insert-molded part with brass threaded inserts

Insert Molding

Embed metal inserts — threaded fasteners, pins, bushings — directly into the molded part during the injection cycle, eliminating secondary assembly.

Parameter	Specification
Mold Life Cycle	Up to 10,000 shots (aluminum) · up to 100,000 shots (soft steel)
Mold Cavities	Single-cavity and multi-cavity configurations
Mold Tolerance	±0.005 mm
Molded Part Tolerance	±0.05 mm (tighter on request)
Machine Clamping Force	50 T – 1,000 T
Maximum Part Size	800 × 600 × 400 mm
Mold Materials	7075 Aluminum, P20, 718H, 738H, S136, NAK80
Lead Time	2 – 4 weeks (expedited: 10 business days)
Minimum Order Quantity	1 piece
Mold Storage	Free storage for 24 months of inactivity
Quality Inspection	CMM, mold flow analysis, DFM report included

CNC-machined aluminum mold tool with polished cavity surface

Aluminum Mold Tooling

Aluminum machines 3–5× faster than steel, shortening cycle times by 30–40% and cutting tooling cost by up to 25%. Excellent thermal conductivity speeds cooling, producing dimensionally stable parts with minimal warpage.

Best for: functional prototypes, design verification, bridge production up to 10,000 shots.

Soft steel P20 injection mold tool with textured surface finish

Soft Steel Mold Tooling

Soft steel tooling (P20, 718H, 738H) extends mold life to 50,000–100,000 shots. Supports higher injection pressures and engineering-grade resins that would wear aluminum prematurely, with better surface finishes including SPI-A1 mirror polish.

Best for: low-volume production, engineering-grade plastics (glass-filled nylon, PEEK), textured or high-gloss finishes.

Resin Selection

Available Injection Molding Materials

We work with all common thermoplastics, selected thermosets, and liquid silicone rubber. Every resin is sourced from certified suppliers to ensure consistent mechanical properties.

ABS PC PC-ABS PP PA6 / PA66 / PA12 HDPE POM (Acetal) PBT PVC PEI (Ultem) PS PMMA TPU TPE PEEK LSR

Grid of injection molding material samples showing resin pellets and test bars

Surface Finish

Custom Finishes for Injection Molded Parts

KUSLA follows SPI (Society of the Plastics Industry) standards to define mold surface finishes, from mirror-polish A1 to heavy texture D3. Secondary finishing operations are available for color, branding, and functional coatings.

SPI A1 — Mirror Polish SPI B1 — Semi-Glossy SPI C1 — Matte SPI D1 — Textured Color Painting Silk Screen Printing Pad Printing Laser Engraving

SPI surface finish reference chart showing A1 to D3 texture standards

The Process

What Is Prototype Injection Molding?

Prototype injection molding — also called rapid injection molding — uses quick-turn aluminum or soft steel tooling to produce injection-molded parts significantly faster and cheaper than traditional hardened-steel production molds. The process bridges the gap between 3D-printed prototypes and full production: you get parts made from the exact same resin, with the same wall thicknesses, gate marks, and surface finishes as mass-produced components, but with tooling lead times measured in days rather than months.

This makes it ideal for three scenarios: validating part geometry and fit in the actual production material, running functional or regulatory tests that require production-grade specimens, and fulfilling low-volume orders (typically 50–10,000 units) while production tooling is still being built.

Why Start With Prototype Injection Molding?

Starting with prototype tooling de-risks your production launch. A prototype mold lets you test the real part — not a simulation or a 3D-print approximation — before committing $20,000–$100,000 to hardened production tooling. If your DFM review reveals a wall-thickness issue or a weld-line problem, modifying aluminum tooling costs a fraction of reworking hardened steel.

Prototype molding also compresses your go-to-market timeline. While your production mold is being built (8–16 weeks), prototype tooling can deliver 500–5,000 bridge-production units in 2–4 weeks, letting you ship to early customers, run field trials, or stock initial inventory.

Is injection molding a good option for prototyping?

Yes. Prototype injection molding is ideal when you need production-grade material properties, realistic surface finishes, or low-volume production runs (typically 50–10,000 units) for functional testing and market validation.

How much does a prototype mold cost?

A small, single-cavity aluminum mold typically costs $200–$2,000. Larger or multi-cavity molds with complex geometry, side actions, or textured surfaces can exceed $20,000. Soft steel molds fall between aluminum and hardened production tooling in cost.

How much does low-volume injection molding cost?

Total cost includes tooling plus per-part cost. Tooling starts around $200 for simple aluminum molds. Per-part cost decreases as volume increases because tooling cost is amortized across more units. A typical small project starts around $500 total; complex multi-cavity tooling with 1,000+ parts can range from $5,000–$30,000+.

What is the lead time for prototype injection molding?

Standard lead time is 2–4 weeks from design approval to finished parts, including DFM review, tooling, T1 sampling, and production. Expedited projects with simple geometry can ship in as few as 10 business days.

Can you 3D print injection molds?

Yes, for simple geometries and very short runs (under 50 shots). 3D-printed mold inserts are useful for early-stage concept validation, but aluminum or steel tooling is recommended for better dimensional accuracy, surface quality, and mold life.

What is the ordering process?

After you submit a quote request with your 3D CAD file, our engineers create a DFM report with parting line visualization, draft analysis, and mold-flow simulation. Once approved, tooling production begins. T1 samples are shipped for your approval before the remaining parts are molded and shipped.

Does KUSLA perform mold flow analysis?

Yes. Mold flow analysis is a standard step on every project. It predicts fill patterns, weld lines, air traps, and potential warpage — allowing us to optimize gate location and cooling channel design before cutting tooling.