Custom thermoset molding from our China factory. Phenolic, epoxy, BMC and SMC parts that stay rigid when hot. Factory-direct quote within 24 hours.
The problem
When a part sits near heat, melts under load, or cracks in service, the material was wrong. Few factories still run thermoset molding well.
With YiguProto as your China manufacturer and supplier, you get one accountable partner from quote to delivery.
Quick facts
The basics
Thermoset molding starts with a plastic powder or a soft preform. It is pushed into a hot mold and heated. The heat makes the plastic cross-link and set for good.
Here is the key point. A thermoset part cannot be melted again. Heat it later and it stays hard. That is why it keeps its shape in hot, harsh places where other plastics go soft.
It is the opposite of thermoplastic molding. Thermoplastic uses a hot material and a cold mold. Thermoset uses a cold material and a hot mold.
Parts stay rigid at temperatures where thermoplastics soften and creep.
Low creep and tight dimensional stability, so fits stay tight for years.
Excellent electrical insulation and flame resistance. Built for switchgear.
Handles oils, fuels and solvents that eat through other plastics.
Choose the right material
Short answer: thermoplastic can be melted again, thermoset cannot. Everything else follows from that.
| Property | Thermoplastic | Thermoset |
|---|---|---|
| How it sets | Cools down and hardens | Heats up and cross-links |
| Can it be melted again? | Yes, it can be remelted | No, it is permanent |
| Heat resistance | Good, but softens when hot | High, it keeps its shape |
| Chemical resistance | Moderate | Very good |
| Electrical insulation | Good | Excellent |
| Typical resins | PP, ABS, PC, PA, POM | Phenolic, epoxy, BMC, DAP |
| Best for | Recyclable, tough parts | High-heat, rigid parts |
Capabilities
Real numbers, so you can spec your part with confidence.
| Feature | Capability |
|---|---|
| Materials | Phenolic (PF), epoxy, polyester, vinylester, melamine, urea, DAP, BMC, SMC |
| Processes | Thermoset injection, compression and transfer molding |
| Molding tolerance | ±0.02 mm (0.0008 in) |
| Mold temperature | 150 °C to 200 °C |
| Mold type | Hardened steel, single or multi-cavity |
| Insert options | Molded-in threads and metal inserts |
| Volumes | Low-volume bridge runs to 500,000+ parts |
| Lead time | 15 to 25 business days |
| Quality | ISO 9001:2015 managed, CMM and FAI reports |
Materials
Not sure which one fits your part? Tell us what it must do and we will suggest a material.
PF
Flame and chemical resistant. Circuit breakers and handles.
BMC
Glass-filled and strong. Electrical boxes and pump housings.
SMC
Large, stiff panels. Automotive and electrical cabinets.
EP
Strong and insulating. Encapsulation and electrical parts.
UP
Fast cure and low cost. General industrial parts.
VE
Tougher than polyester. Chemical tanks and marine parts.
MF
Hard, easy-clean surface. Switch plates and tableware.
DAP
Very stable and insulating. Connectors and defence parts.
Processes
We pick the process that fits your part shape, your volume and your budget.
The fastest of the three. Short cycles and less waste. Best for medium to high volumes.
Material is pressed into a heated mold. Great for large, thick parts and short runs.
Material flows through a runner into a closed mold. Good for inserts and tight details.
Glass-filled compounds for strong, stiff parts with good surface finish.
One-stop service
Complete molding solutions from one factory. No handoffs between vendors, and no parts stuck in someone else's queue.
We remove flash and give every part a clean, even edge before it ships.
Baking, annealing and normalizing to stabilize the part and lock in its strength.
Drilling, tapping and milling after the part is cured, to your drawing.
Threads, metal inserts and bonded assemblies, delivered ready to use.
Industries
We mold parts for teams that cannot afford a failure in the field.
Cost control
Most of your part cost is decided before the first shot. Our engineers check all four for free.
Thick sections cure slower and can crack. Even walls cure evenly and hold tolerance.
Parts release cleanly from a hot mold and come out without drag marks.
Where the material enters decides the flow and where weak knit lines form.
Sharp corners concentrate stress. Radii spread the load and stop cracks.
Why engineers trust us
Thermoset molding is a small club. A real factory stands behind every quote.
10+ years molding plastic parts in Dongguan, China. 200+ staff, with tooling and molding in-house. One supplier for the whole job.
Engineers who know cure time, shrinkage and gate placement. Free DFM report with every quote.
A factory you can audit. Come and visit our company in Dongguan, China, or send your own inspector.
NDA on request. Your mold and your design stay yours. Itemized prices with no hidden fees.
How it works
No account needed. No long forms. Just send the files you already have.
Upload STEP, STP, IGES, STL or a PDF drawing. Tell us the volume and where it will be used.
You receive an itemized price, a lead time and a free DFM report.
We cut the mold, run the parts and cure them to spec in-house.
Worldwide shipping with tracking, photos and inspection reports.
FAQ
Need a fast answer? Message us and we usually reply within minutes.
+86 150 1712 6694