Mold Manufacturing

We design and build durable, high-precision plastic injection molds that ensure consistent quality and cost efficiency for plastic injection molding production worldwide.

Why Mold Manufacturing Matters

In plastic injection molding, the mold is not just a tool — it determines the accuracy, efficiency, and cost of the entire project. A poorly designed or low-quality mold can lead to defects, material waste, and costly production delays.

At Rayleap Plastic, we focus on building precision molds that last. By combining advanced engineering, premium tool steel, and strict quality control, we ensure every mold delivers consistent performance and long-term value for our clients.

High-precision plastic injection mould with multiple cavities for custom manufacturing.

Our Mold Manufacturing Capabilities

Single-cavity injection mold for low-volume plastic parts

Single-Cavity Molds

Ideal for prototypes and low-volume production, single-cavity molds help reduce initial investment while ensuring precision and quality.

Multi-cavity injection mold for high-volume plastic parts

Multi-Cavity Molds

For high-volume production, multi-cavity molds provide faster cycle times and lower per-unit costs, ensuring efficiency and consistency.

a molten plastic conveying unit used within an injection mold. I

Hot Runner Systems

We design hot runner molds that reduce material waste, shorten cycle times, and improve part quality for complex and large-scale projects.

Cold runner mold used in plastic injection molding production

Cold Runner Systems

Cold runner tooling remains a cost-effective solution for many plastic components, offering flexibility, easy maintenance, and durability.

Insert molds used in plastic injection molding for metal and plastic combinations

Insert Molds

Insert molding combines pre-made inserts, such as metal parts, with molten plastic in a single process.This molding process is suitable for producing composite parts made of metal and plastic.

Complex mold used in precision plastic injection molding production

Complex Tooling

From intricate part geometries to demanding tolerance requirements, we build complex molds that meet the highest industry standards.

How Do We Turn Your Design Into a Durable Mold?

Mold flow simulation showing plastic filling patterns for injection molding

Step 1 – Moldflow Analysis

Before any steel is cut, we run advanced Moldflow simulations. This allows us to predict how molten plastic will fill the cavity and identify risks such as air traps, sink marks, or warpage. By solving these problems early, we reduce costly rework and ensure a more reliable mold design. This step saves time and guarantees smoother production.

CNC plastic injection mold cavity

Step 2 – CNC Machining

Using high-speed CNC machines, we manufacture core and cavity components with exceptional accuracy. The process ensures tight tolerances, consistent repeatability, and excellent surface finishes. CNC machining is particularly effective for complex geometries and large tooling blocks. This precision lays the foundation for molds that last millions of cycles.

Wire EDM cutting intricate injection mold features

Step 3 – EDM (Electrical Discharge Machining)

For areas that CNC cannot reach, we apply EDM to shape intricate details and sharp corners. The process uses controlled electrical sparks to erode material, achieving complex cavities with unmatched precision. EDM is ideal for deep ribs, narrow slots, and undercuts. This capability ensures design flexibility without compromising strength.

Precision surface grinding of injection mold components

Step 4 – Grinding & Polishing

After machining, all surfaces undergo fine grinding and careful hand polishing. This step enhances dimensional accuracy, improves mold fit, and refines surface finish for better part quality. For optical or glossy products, polishing is critical to achieving a mirror-like effect. Our skilled technicians ensure each mold meets the required finish level.

Technician assembling injection mold cores and cavities

Step 5 – Assembly & Testing

Once individual components are ready, we assemble the mold and perform functional testing. Trial runs are conducted to check injection flow, cooling, and ejection systems. Any issues discovered are corrected immediately to ensure production stability. This phase confirms that the mold performs as intended before mass production.

polished injection mold cavity ready for shipping

Step 6 – Finishing & Quality Check

Finally, the mold undergoes surface finishing and a rigorous inspection process. We check for dimensional accuracy, durability, and operational safety. Only molds that meet strict quality standards are approved for delivery. This ensures every mold shipped to customers is reliable, efficient, and production-ready.

What material is used for plastic injection molds?

P20

P20 is the most widely used material for plastic injection molds. It offers good machinability, durability, and cost-efficiency, making it ideal for medium-volume production.
Types: P20, 1.2311, 1.2312

H13

H13 provides excellent toughness and heat resistance. It is suitable for high-volume molds, especially when processing high-temperature engineering plastics.
Types: H13, 1.2344, SKD61

Stainless Steel

Stainless Steel (420, 440C, S136)
Stainless steel is used for molds requiring high polish or resistance to corrosion. It is a preferred choice for precision molds and abrasive plastics.
Types: S136,S136H, NAK80, S136, 316L

Mold Projects We’ve Built

From toy molds to large industrial tooling, Rayleap delivers precision mold manufacturing for global clients.

  • High precision 32 cavity injection mold for mass production
  • Injection mold for furniture five-star chair base
  • Multi-cavity hot runner mold for efficient mass production
  • Multi-cavity bottle cap mold for plastic cap manufacturing
  • Stationery accessory injection mold for precision plastic components

    • Frequently Asked Question

    Have questions about mold manufacturing services? Here are some of the most common topics clients ask us.

    High-Quality Tool Steel – Molds are built with durable steels like P20, H13, or stainless steel, which are expensive but guarantee long service life.

    Precision Engineering & Design – Detailed CAD, DFM, and Moldflow simulations are required before machining, adding significant upfront costs.

    Complex Machining Processes – CNC, EDM, grinding, and polishing are labor-intensive and demand highly skilled operators.

    Multi-Cavity & Runner Systems – Features like multi-cavity or hot runner systems improve efficiency but increase mold complexity and cost.

    Testing & Quality Assurance – Each mold undergoes trial runs, tuning, and inspections to ensure quality before mass production.

    Depending on complexity, size, and required features, mold lead time typically ranges from 4 to 10 weeks.

    Yes. Choosing the right mold design, material grade, and cavity number can balance cost and performance. Working with an experienced mold maker helps optimize both price and quality.

    Key factors include part geometry, material choice, production volume, and surface finish requirements. Each of these impacts cavity layout, cooling systems, and mold durability.

    Latest Articles

    Let’s Build Your Next Project Together

    Rayleap specializes in plastic mold manufacturing and injection molding services for global clients. From prototype to mass production, our team delivers reliable quality and on-time results.

    Get A Free Quote Contact Us

    Contact Us