BMC & SMCMolds · Compression & Injection Molded Parts
BMC · SMC · Thermoset molding
BMC & SMC Mold and Molded Parts Manufacturer in China
China United Mould designs and builds SMC and BMC compression molds and BMC injection molds, and supplies custom thermoset parts to your drawing for electrical, automotive, lighting, appliance and construction products. Making molds since 2000, with plants in Huizhou and Dongguan.
- DFM review before the mold is designed
- Molds built in our own tool room
- ISO 9001 quality management system
What we make
BMC and SMC molds, and the parts they make
The mold and the parts are quoted and managed together. Tool design, trial samples and production parts follow the same drawing revision and the same project engineer.
BMC & SMC Molds
Compression molds and thermoset injection molds, designed and built for your part and press.
SMC Molded Parts
Compression molded meter boxes, enclosures, panels and covers for indoor and outdoor use.
BMC Molded Parts
Injection or compression molded reflectors, housings, motor parts and insulators.
Choosing a material
BMC or SMC?
Both are glass-fiber-reinforced thermosets that keep their shape at high temperatures, insulate electrically and can be flame retardant. SMC is a sheet with longer fibers, compression molded into larger, stronger parts. BMC is a dough with shorter fibers, injection or compression molded into smaller, more detailed parts.
Full comparison| SMC | BMC | |
|---|---|---|
| Form | Sheet | Dough |
| Fiber length | About 25 mm | About 3–12 mm |
| Process | Compression | Injection or compression |
| Part size | Medium to very large | Small to medium |
| Best at | Strength, large panels | Detail, tight dimensions |
Typical values; each grade's data sheet gives exact figures.
How a project runs
Six steps for a BMC or SMC project
- 01
DFM review
We check your part for BMC or SMC molding and send a DFM report.
- 02
Mold design
3D mold design: layout, heating, shear edge or gating, ejection.
- 03
Mold making
Machining, fitting and polishing in our tool room, then hard-chrome plating.
- 04
Trials & samples
Mold trial, sample parts and a dimensional report for your approval.
- 05
Production
Parts molded with the settings approved at sampling.
- 06
Finishing & delivery
Deflashing, machining or inserts, inspection and export packing.
Applications
Where BMC and SMC parts are used
Electrical & power
Meter boxes, enclosures, switchgear and breaker parts, insulators
Automotive & EV
Battery covers and enclosures, body panels, headlamp reflectors
Lighting
Lamp reflectors and heat-resistant housings
Appliances & motors
Motor housings and end caps, appliance parts
Construction & water
Water tank panels, covers, gratings, cable trays
Sanitary
Shower trays, bathtubs and sinks
Guides
Engineering guides for BMC and SMC
SMC vs Fiberglass Hand Lay-up (FRP): Cost, Quality and Volume
How compression molded SMC compares with hand lay-up and spray-up fiberglass (FRP) on part quality, consistency, cycle time,…
BMC Injection Molding vs Compression Molding
How BMC injection molding and BMC compression molding differ in part properties, design freedom, tooling, cycle time and…
How Much Does an SMC Mold Cost? Price Drivers Explained
What sets the price of an SMC compression mold (part size, press, steel, surface, heating, inserts and volume)…
FAQ
Questions we are often asked
More answers on our FAQ page, or send us your question with your drawing.
What is the difference between BMC and SMC?
SMC is a sheet with longer fibers that is compression molded into larger, stronger parts. BMC is a dough with shorter fibers that flows further and is injection or compression molded into smaller, more detailed parts.
Do you supply both the mold and the parts?
Yes. We design and build the mold and supply the molded parts, so the tool, the trial samples and the production parts are handled by the same project engineer.
What files do you need for a quotation?
A 3D model (STEP or IGES), a 2D drawing with tolerances, the material or performance requirements, the expected annual volume and any surface, color or flame-rating requirements.
Can you review my design before quoting?
Yes. We review the part for BMC or SMC molding and suggest changes to wall thickness, ribs, draft and features before the mold is designed.
Which process should I use for my part?
It depends on size, wall thickness, detail, strength and volume. Large panels and enclosures are usually SMC compression molded; small, detailed parts in volume are usually BMC injection molded.
Request a quote
Send us your BMC or SMC part
Attach a drawing or 3D file and tell us the material, the annual volume and any flame or color requirements. We reply with DFM comments and a quotation.