Custom Injection Molding Services for Plastic Parts

”

Custom Injection Molding Services

Bring your plastic parts from validated designs to repeatable production with custom injection molding.

• Prototype to Production Support
• Full End-to-End Traceability
• Tooling, Molding & Finishing
• DFM Review Before Tooling

What Is Plastic Injection Molding Service?

Plastic injection molding is a manufacturing method. Molten plastic is injected into a precision mold, cools and hardens, then finished parts are ejected for mass production. It is commonly used to make plastic casings, functional parts, consumer goods, medical and electrical components that demand stable dimensions in large-batch production.

When Should You Choose Injection Molding Manufacturing?

Pick injection molding if your design is finalized, you need repeated orders and consistent quality. Although mold creation involves upfront costs, unit costs drop significantly with higher production volumes.

Tooling Solutions for Every Stage

Project Need	Recommended Solution
Early concept validation or very low quantity	CNC machining or 3D printing
Functional plastic samples with production-like material	Rapid injection molding
High annual volume and lowest unit cost target	Production injection molding

Tooling Approach	Description
Prototype Tooling	Functional testing, bridge production, and market validation. Supports faster learning before major production investment.
Rapid Tooling	Limited runs and early commercial products. Balances cost, lead time, and repeatability.
Production Tooling	Stable, recurring, and higher-volume programs. Built around long-term consistency, efficiency, and tool life.

The mold cost is influenced by part size, geometry, number of cavities, undercuts, sliders, lifters, surface texture, resin type, tooling material, and expected tool life.

Materials for Injection Molding

Material	Key Properties	Typical Applications
ABS	Balanced strength, impact resistance, and cost efficiency	Consumer housings, automotive trim, electronics enclosures
PC	High impact strength and transparency options	Protective covers, lighting parts, safety-related housings
PC/ABS	Combines PC toughness with ABS processability	Electronic devices, automotive interiors, durable enclosures
PP	Lightweight, chemical-resistant, and fatigue-resistant	Containers, living hinges, fluid-handling parts, consumer products
PA / Nylon	Strong, wear-resistant, and mechanically durable	Gears, clips, mechanical components, automotive parts
POM / Acetal	Low friction and good dimensional stability	Precision gears, latches, bushings, moving components
PBT	Good electrical performance and heat resistance	Connectors, switches, electrical housings
PMMA / Acrylic	Excellent clarity and weather resistance	Lenses, display parts, transparent covers
TPU / TPE	Flexible, resilient, and soft-touch	Grips, seals, protective covers, flexible components
HIPS	Good dimensional stability, good impact resistance	Refrigerator inner liners, instrument enclosures, display frames
Glass-Filled Resins	Increased stiffness and strength	Structural plastic parts and load-bearing housings

Finishes and Secondary Operations for Molded Parts

The mold surface largely defines the appearance of the finished part. Surface texture, polish level, material, and draft angle should be considered together before tooling begins.

Option	Purpose	Typical Use
Polished Mold Finish (SPI A, SPI B)	Creates smooth or glossy molded surfaces	Transparent parts and visible consumer components
Textured Mold Finish (VDI 3400, MT11010)	Adds matte, leather-like, grained, or patterned surfaces	Housings, handles, automotive and consumer products
Color Matching	Produces parts in specified resin colors	Branded products and consumer-facing parts
Pad Printing	Adds logos, icons, and operating symbols	Controls, electronic housings, product branding
Heat Staking	Secures inserts or joins components using heat	Housings, electronic assemblies

High-gloss and textured surfaces require adequate draft angles. Glass-filled materials, weld lines, and complex geometry can also affect cosmetic appearance. Identify all Class-A or customer-facing surfaces before tooling approval.

How Does the Injection Molding Process Work?

1. Upload Your Design — Submit your 3D model, 2D drawing, resin, quantity, color, finish, and quality requirements.
2. Tooling Quote & DFM — Receive a tooling moldability recommendation, pricing, and lead-time estimate.
3. Mold Manufacturing — The mold is manufactured, assembled, and prepared for trial production.
4. T1 Sampling & Validation — Initial samples are reviewed for dimensions, appearance, assembly, and functional performance.
5. Production & Quality Inspection — Approved parts move into production with agreed quality controls.
6. Packaging & Delivery — Finished components are packed to protect cosmetic surfaces and maintain lot traceability where required.

Injection Molding Capabilities

Standards	Description
Machine size	30 to 1,000 tons
Mold Type	Aluminium and steel (various grades)
Shot life	500 to 100K+ shots
Part Tolerance	±0.1 mm

Design Tips for Injection Molded Parts

• Maintain Uniform Wall Thickness — Even wall thickness improves filling, cooling, dimensional stability, and cosmetic quality. Thick sections may increase sink-mark risk and cycle times.
• Add Adequate Draft Angles — Draft helps the part release cleanly. More draft is generally needed for textured surfaces, deep walls, and cosmetic features.
• Use Ribs Instead of Thick Walls — Ribs add stiffness without creating heavy sections that may lead to sinks, voids, or warpage.
• Review Undercuts Carefully — Sliders, lifters, collapsible cores, or secondary operations may be required, adding mold complexity and cost.
• Consider Shrinkage and Tolerance Together — Resin shrinkage varies by material, fillers, geometry, processing conditions, and part thickness. Identify critical dimensions early.

FAQ

What causes sink marks in injection molded parts?
Sink marks are often associated with thick sections, heavy bosses, ribs that are too thick, uneven cooling, or material shrinkage. Design review can reduce this risk before tooling.

Can you add metal inserts to plastic parts?
Yes. Metal inserts can be incorporated through insert molding or installed in a secondary heat-staking process, depending on the design and performance requirements.

Can injection molded parts have logos or textures?
Yes. Logos, text, textures, polished surfaces, and matte finishes can be incorporated through mold design or secondary processes such as pad printing and laser marking.

What is the minimum order quantity for injection molding?
There is no universal minimum order quantity. The practical quantity depends on the part design, tooling type, material, and project economics.

How long does injection mold tooling take?
Tooling lead time depends on part size, mold complexity, number of cavities, undercuts, texture, material, and validation requirements. Submit your design for a project-specific estimate.

What is injection molding best used for?
Injection molding is ideal for repeatable plastic parts with stable designs, especially when consistent quality, integrated features, and scalable production are required.

“