
China Custom Plastic Injection Mold Manufacturer Since 2005
ONE-STOP SUPPORT FROM DESIGN AND PROTOTYPING,
TOOLING AND INJECTION MOLDING TO SHIPMENT
PROJECT-BASED QUOTATIONS AND DELIVERY PLANNING

Established in 2005, PIM (Topworks) is a plastic mold company providing plastic part design support, custom injection mold manufacturing, and injection molding services.
Topworks is a plastic mold manufacturer focused on project-specific tooling requirements, dimensional consistency, and quality review.
And now it becomes a key Chinese plastic mould company and contract tooling maker for high-quality plastic injection mold tooling.
Starting from humble beginnings in 2005 with 15 employees in a 500 square meter plant in Huangyan, known as a Chinese mold town with over 3 thousand plastics companies,
Today it has grown to employ 80 staff across locations in both Huangyan and Dongguan, including over 70 professional plastic mold engineers boasting rich mold-making experience.


Best Small to Medium-Sized Business (SMB) and Startup: Topworks is a good option to consider by businesses that need a high level of collaboration, personal service, and one-stop-shop, design to production. The fact that we concentrate on customer service and project management is a major benefit to clients that might not have the large in-house engineering staffs.
Talking to you straight means we can figure out what you need and get it just right. Our goal is to give you the best molds out there, custom-made quick and smart for what you ordered. We’re in it for the long haul – aiming to boost your workflow and keep you crushing it in the marketplace year after year. Teaming up with you means a lot to us and we can’t wait to keep this going strong as trusty partners down the road.


Inquiry More Today
Send us your part drawings, resin requirements, and expected production volume to discuss DFM, mold construction, sampling, and a project-specific quotation.
Some cases
Multi-Slide & Core-Pulling MoldsHydraulic & Collapsible Cores →
Precision Injection Molds±0.005mm Steel · PEEK / LCP / POM →
Multi-Cavity Cap & Preform Molds8 to 72 Cavities · S136 Steel →
2K Overmolding & Electronics MoldsInsert Molding & UL94 V-0 Housings →
Consumer Appliance MoldsClass-A Cosmetic Enclosures →
Automotive Plastic MoldsBumpers, Doors, Grilles & Trim →
What Our Clients Say
“I’m glad to inform you that all plastic parts are perfect!!! We are delighted, and therefore there are good chances to continue our relationship for any coming new project.”
“Steven is an excellent professional with great knowledge and technical practice.”
“Steven is a very detail-oriented project manager and engineer who can solve problems creatively and also provides excellent service. It was a pleasure working with him.”




Custom Plastic Mould Solutions by Product & Industry
Explore 18 mold application categories. Tool design, materials, cavity layouts, and production performance are evaluated against the requirements of each project:
Car Bumper Moulds
Automotive bumper tooling with parting-line, surface-finish, cooling, and sequential valve-gate options based on part geometry.
Car Door Panel Moulds
Door-panel tooling for textured trim, speaker-grille details, mounting features, and coordinated gating and ejection.
Radiator Grille Moulds
Grille tooling with complex openings, precision shut-offs, and surface-finish planning for decorative plastic components.
Plastic Crate Moulds
Injection molds for ventilated crates, bottle crates, and collapsible containers, with cooling and ejection matched to the design.
Plastic Pallet Moulds
1200×1000mm 9-leg nestable & 3-runner steel-reinforced rackable pallet tooling with 12–16 hot drops.
120L / 240L Dustbin Moulds
Molds for wheeled waste bins and household bins, with lid, hinge, rib, cooling, and ejection requirements reviewed by project.
Plastic Chair Moulds
Monobloc, rattan armchair & gas-assisted chair moulds with interchangeable backrest pattern inserts.
Plastic Stool Moulds
Stackable dining stools, rattan stools, TPE anti-slip step stools & 5-piece foldable stool sets.
Paint Bucket & Pail Moulds
1L–25L round/square pails & tear-band lids holding ≤0.08mm concentricity, IML robot ready.
Thin-Wall Container Moulds
Thin-wall food packaging molds for containers, cups, and tubs, with filling, cooling, ejection, and IML requirements reviewed.
PET Preform Moulds
PET preform mold concepts for beverage and container applications, including cavity layout, neck finish, and hot-runner choices.
Cap & Closure Moulds
Cap and closure tooling for threaded caps, flip-top closures, and related packaging components; cavity count is project-specific.
Battery Case & Box Moulds
Automotive N-series, DIN, inverter IT500, UPS & Li-ion cell containers with leak-proof sealing flanges.
Safety Helmet Moulds
Molds for safety helmet shells and associated components; final product compliance requires appropriate independent testing.
Pipe Fitting Moulds
Collapsible-core, arc-core & hydraulic chain-core moulds for elbows, tees & threaded fittings.
Electronics & Connector Molds
Electronics and connector tooling for housings, terminal blocks, and precision features using project-specified resins.
Printer & Office Equipment Molds
Multi-slide structural housings for multifunction printers, copiers, POS terminals & server bezels.
Plastic Flower Pot Moulds
Molds for nursery pots and decorative planters, including textured surfaces, drainage details, and production considerations.
Injection Mold Pricing and Manufacturing Process

Injection Mold Quotation Process
The injection mold quotation process can seem complex for customers who are new to injection molding manufacturing. With multiple steps involving design, engineering, tooling, and production planning, generating an accurate quote requires expertise and care.
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Key Factors Influencing Injection Mold Pricing
Injection mold pricing depends on numerous intersecting components and influencing variables. Unlike simple manufactured parts quoting, mold costs encompass specialized design, engineering, machining, components, automation, and project management.
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Injection Mold Manufacturing Process
Below we detail our advanced mold machining technology, quality standards, inspection protocols, and process controls.
Click for moreWhat We Supply
- Plastics Design
- Rapid Prototyping
- Multi-cavity Plastic Mold
- Family Plastic Mold
- Hot-runner Plastic Mold
- Plastic Molding (Injection and Blow)
- Secondary Operations
- Assembly




