How To Customize SMC Parts?
Customizing SMC parts starts with understanding how the part will work after molding, machining, assembly, and long-term operation. SMC is a reinforced composite material made from unsaturated polyester resin, glass fiber, mineral filler, curing agent, and additives. After compression molding, it can form rigid insulation parts with stable shape, good electrical performance, flame resistance, and repeatable dimensions.
SENKEDA supports SMC molded insulation parts for electrical cabinets, switchgear, power distribution systems, busbar structures, battery equipment, communication devices, and industrial machinery. A good customization plan should not begin with shape only. It should include voltage level, mechanical load, installation method, mold design, tolerance, surface requirement, and expected order quantity.
Define The Working Role First
A custom SMC part may be used as a structural cover, insulation barrier, busbar holder, arc shield, spacer, support bracket, terminal base, or protective housing. Each role has a different design focus.
For an insulation barrier, thickness, creepage distance, clearance distance, and surface quality are more important. For a support bracket, rib design, screw boss strength, compression resistance, and impact performance should be reviewed first. For a molded cover, flatness, appearance, edge sealing, and assembly gap may affect the final product more directly.
Our engineering team usually asks buyers to confirm where the part will be installed, what components it will contact, how it will be fixed, and whether it must resist vibration or heat. These details help avoid repeated mold modification later.
Turn Drawings Into Moldable Structures
SMC is suitable for compression molding, but the drawing should be designed with molding behavior in mind. Wall thickness should remain as balanced as possible, because sudden thickness changes may cause uneven curing, surface marks, or internal stress.
For many electrical insulation components, common wall thickness ranges from 3 mm to 8 mm. Thicker sections can improve rigidity, but they may also increase molding pressure, curing time, material consumption, and part weight. Rib structures are often better than simply increasing the whole wall thickness.
Draft angle is also important. A molded SMC part usually needs a reasonable demolding angle to protect edges and reduce mold wear. For deep cavities, bosses, and vertical walls, early mold review can reduce production risk.
Confirm Electrical And Flame Requirements
Custom SMC insulation parts are often selected because they combine insulation and flame-retardant performance. According to common IEC 60893 references for rigid insulating laminates and UL 94 flame testing, many electrical-grade SMC materials can be designed to meet V-0 flame classification and stable dielectric performance.
Typical SMC insulation materials may show dielectric strength around 10 to 15 kV/mm under controlled ASTM D149 testing conditions. Flexural strength can commonly reach above 100 MPa depending on glass fiber content, formulation, and molding process. These figures are used as industrial reference data, while the final value should be confirmed by material grade, part thickness, and test direction.
For high-voltage parts, buyers should not only check raw material data. The finished structure must also control burrs, sharp corners, surface contamination, screw hole distance, and metal insert position.
Decide Whether Inserts Are Needed
Many customized SMC components require metal inserts, threaded sleeves, embedded nuts, or mounting points. Inserts can improve assembly efficiency, but they must be planned carefully.
The insert material, anti-rotation structure, pull-out strength, and molding position all affect final reliability. If the insert is too close to the edge, cracking may happen during tightening. If the insert is not fixed firmly during molding, position deviation can affect later assembly. For repeated production, insert control should be included in the inspection standard.
Review Surface And Appearance Needs
SMC parts can be molded in natural color or customized color. The surface can be matte, textured, or relatively smooth depending on mold finish and formulation. For internal electrical parts, appearance may not be the first priority, but surface cleanliness and dimensional accuracy are still important.
For visible covers, buyers should confirm color range, logo position, texture, parting line position, and acceptable surface marks before mold making. These details are easier to control before production than after the mold is completed.
Plan Tooling, Samples, And Batch Control
As an OEM SMC parts manufacturer, SENKEDA usually follows a clear customization process: drawing review, material selection, mold design, tooling production, sample molding, dimensional inspection, assembly testing, and batch production.
Sample confirmation is especially important for custom molded parts. It allows buyers to check hole position, installation gap, strength, insulation distance, surface quality, and packaging method before volume order. Once the sample is approved, later production can follow the same mold, formulation, process window, and inspection records.
Make Customization Easier To Repeat
A successful SMC part is not only molded into the required shape. It must be easy to install, stable in use, and consistent across repeat orders. Buyers should prepare drawings, working voltage, load condition, color requirement, quantity forecast, assembly method, and inspection focus before starting customization.
SENKEDA can help review design details, improve moldability, reduce unnecessary material use, and support stable production for electrical insulation applications. Better preparation before tooling can shorten sampling time, reduce modification cost, and make future orders easier to manage.