Overmolding

overmolding machining parts

Overmolding machining integrates multiple materials to enhance product performance (such as waterproofing and impact resistance) and improve tactile feel while streamlining production processes. It is suitable for diverse industries. For detailed process information or to request a quote, please contact us Weldo

What is overmolding ?

Overmolding is a manufacturing technique that integrates two or more materials into a single unit through injection molding. Typically, a rigid substrate serves as the base layer, achieving adhesive-free bonding between materials via physical interlocking or chemical molecular affinity. This process is categorized into two-shot molding and insert molding. The former completes the process within a single production cycle using a rotating mold, while the latter requires transferring the substrate to a second mold for injection.

overmolding part 2
overmolding part 1

Material for Overmolding

The base materials are predominantly rigid (engineering plastics/metals), while the overmolding materials are mostly elastomers or soft plastics, providing a soft tactile feel, slip resistance, or sealing functionality.

The following are optional materials.

Metal material :

custom aluminum cnc milling parts

Aluminum

Aluminum is the most commonly used precision-machined component. It has a low density, a hard texture, and a soft material. Thanks to its corrosion resistance, it is widely used in aerospace, bionic bones, and automotive parts manufacturing.

Color : Silver.

Types : Aluminum 60617075202450526063 and MIC-6.

Surface finish : Polishing, Brushing, Sandblasting, Chrome Plating, Anodizing, Electroplating, Powder Coating, Laser Etching.

Delivery time : 1-5 days.

cnc stainless steel machining part

Stainless steel

Stainless steel offers strong corrosion resistance and a smooth, easy-to-clean surface. It is primarily used in kitchen equipment components, medical devices, building materials and construction, as well as automotive parts.

Color : Silver.

Types : Stainless steel 304/316/201/202/430/444/410/420/440c/2205/2507/17-4ph/17-7ph.

Surface finish : Polishing, Brushing, Sandblasting, Electroplating, Spraying, PVD (Physical Vapor Deposition), Passivation, Pickling, Coloring.

Delivery time : 2-5 days.

copper material cnc machining part

Copper

Possesses electrical conductivity, tensile ductility, and antimicrobial properties, primarily used for processing into crafts, decorative items, and medical equipment.

Color  :Orange,yellow.

Types : copper H59/H62/Hpb59-1/C36000/HAI77-2/HSN62-1/HPb/HMn/HAl/HSn/HNi.

Surface finish : Passivation, Electroplating, Chemical Plating, Shot Peening, Sandblasting, Chemical Film Treatment, Polishing, Bright Cleaning.

Delivery time : 1-5 days.

bronze cnc machining part

Bronze

Bronze is an alloy of copper and tin (possibly including lead, zinc, and phosphorus),low melting point (800-900°C) and excellent fluidity, along with corrosion resistance. Low-tin bronze exhibits a golden yellow hue, while high-tin bronze appears grayish-white or silver-gray. It is primarily used in mechanical manufacturing for sculptures, bearings, gears, valves, as well as in marine engineering components such as propellers, as well as marine engineering components like hull fittings and water pumps.

Color : gold/brown.

Types : Tin bronze, aluminum bronze, beryllium bronze, silicon bronze, manganese bronze.

Surface finish : Sandblasting, polishing, knurling, grinding, passivation, chemical film coating, impregnation coloring, brush/spray coloring, electroplating, anodizing, powder coating, brushing.

Delivery time : 1-5 days.

金属零件,光滑表面,圆形

Steel

Iron alloyed with carbon (typically 0.1%-1.7%) and other alloying elements (such as chromium, nickel, manganese, etc.). By adjusting composition and heat treatment processes, diverse properties can be achieved, including high strength, high toughness, wear resistance, and corrosion resistance. It is suitable for producing components such as bolts, shafts, gears, drill bits, milling cutters, and turning tools, and is also frequently used in manufacturing engine valves and turbine blades.

Color : Silver .

Types : Steel S20C,S45C,S50C,SK85,SK95,40Cr,4140,4130,H13,D2,W1,A2,D2,M2,SKD11,ASP-23,S136.

Surface finish :Sandblasting, Mirror Finish, PVD Coating, Brushed Finish, Spray Coating, Electroplating.

Delivery time : 1-5 days

magnesium cnc machining part

Magnesium

Magnesium has a density approximately two-thirds that of aluminum and one-quarter that of steel. Its low hardness results in minimal cutting force and reduced tool wear. With superior thermal conductivity compared to aluminum, it saves CNC machining time and material. Its strength-to-weight ratio outperforms both aluminum alloys and steel, while its damping capacity is 1.5 times that of aluminum, effectively absorbing vibrations and noise. These properties make it an ideal material for aerospace, automotive, and electronics industries.

Color : Silver.

Types : Magnesium alloy AZ91D/AM60B/AM50A/AS41B/ZK60/MB8/AZ31/WE43/ZE41/LA141/LZ91.

Surface finish : Chemical conversion coating, anodizing, nickel plating, electroplating, composite coating, spray painting, powder coating, electrophoretic coating.

Delivery time : 1-5 days.

Plastic material :

cnc maching abs part

ABS

Combining the rigidity of acrylonitrile, the toughness of butadiene, and the processability of styrene, it offers excellent impact resistance (maintaining toughness even at low temperatures) with a balanced hardness and rigidity. Suitable for precision components subjected to moderate loads, it is ideal for manufacturing precision parts such as electronic and electrical enclosures, automotive ducting, interior trim components, and exterior trim components.

Color : Beige,black.

Types : General-purpose, flame-retardant, heat-resistant, high-impact-resistant, transparent (MBS), filled modified, alloyed, functionalized ABS.

Surface finish :Spray coating, electroplating, screen printing, laser engraving, hot stamping, vacuum coating, water transfer printing, sandblasting, anti-fingerprint coating.

Delivery time : 1-5 days.

cnc machining pc part

PC

High-performance thermoplastic with high toughness (low-temp resilient) and rigidity, ideal for CNC precision machining (cutting, drilling). Lighter than acrylic, it offers strong creep resistance and high-frequency insulation, suited for stress-resistant, insulated components. Eco-friendly via recycling by melting, used in electronics casings, spectrometer mounts, heat sinks.

Color : white or black.

Types : General Machinable/Flame Retardant/Reinforced/Blended PC.

Surface finish : Polishing, Hardening, Spraying, Laser Engraving, Electroplating, Hot Stamping.

Delivery time : 1-5 days.

cnc machining PMMA part

PMMA

With a light transmittance as high as 92%, it is hailed as “plastic crystal,” serving as material for optical components such as lenses and light guides. Its optical uniformity surpasses that of ordinary glass, while weighing only half as much. It offers easy machinability, moderate thermal stability, low shrinkage, and impact resistance. Primarily used in consumer electronics industries for display protective covers, lenses, and mobile phone frames.

Color : clear,white,black,colored.

Types : General-purpose / Impact-resistant / Heat-resistant / Pearlescent.

Surface finish : Polishing, enhanced coating, sandblasting for texture, printing for coloring, anti-scratch and anti-fingerprint treatments.

Delivery time : 1-5 days.

cnc machining pom part

POM

High tensile strength and low friction coefficient, excellent dimensional stability, easy machinability, can replace metal as raw material for wear-resistant components such as gears and bearings, widely used in automotive industry, industrial machinery,medical tools, etc.

Color :  white,black,blue,yellow,etc.

Types : POM-H, POM-C.

Surface finish : Polishing, sandblasting, chemical polishing, laser polishing, anodizing/painting.

Delivery time : 1-5 days.

cnc machining PA part

PA

PA (Polyamide, Nylon) exhibits tensile strength ranging from 62 to 85 MPa, low friction coefficient, and excellent heat resistance. Primarily used in high-load structural components such as gears and bearings, it facilitates the manufacturing of automotive parts, consumer electronics, and industrial machinery components.

Color : Colored.

Types : PA6, PA66, PA6T, PA9T.

Surface finish :Mechanical grinding, acid/alkali etching, hydrolysis technology, coating.

Delivery time : 1-5 days.

cnc machining PE parts

PE

PE (Polyethylene) is a thermoplastic material with a low melting point. During machining, tool temperature must be controlled to prevent adhesion, resulting in a smooth, burr-free surface. Its low friction and self-lubricating properties make it suitable for sliding/rotating components. It resists most acids, alkalis, salts, and organic solvents but is soluble in aromatic hydrocarbons and halogenated hydrocarbons. Common applications include food containers, trash bins, and toys.

Color : black,white,colored.

Types : LDPE, HDPE, UHMWPE, PEX, PEX-A, PEX-B.

Surface finish :Polishing, sandblasting, coating, etching.

Delivery time : 1-5 days.

CNC machining peek part

PEEK

PEEK (Polyetheretherketone) is a semi-crystalline specialty engineering plastic characterized by high strength, high melting point, and low friction coefficient. It offers excellent chemical resistance and is suitable for aerospace structural components, high-temperature parts, and medical devices such as endoscopes and handles.

Color : Beige,black.

Types : CF-PEEK, GF-PEEK, PEEK with carbon black/ceramic/PTFE/graphite fillers.

Surface finish :Sandblasting, polishing, metal coating, polymer coating.

Delivery time : 1-5 days.

cnc pp machining part

PP

PP (Polypropylene) is a semi-crystalline thermoplastic with a melting point of approximately 130-160°C. It exhibits excellent processing flow properties. During CNC machining, temperature control is essential (recommended range: 200-230°C). It is suitable for repeated bending operations. Tool selection must align with the material’s characteristics. Primarily used for containers, connectors, and structural components.

Color : black,white,colored.

Types : PP-H, PP-B, PP-R, HIPP.

Surface finish :Polishing, Sandblasting, Coating.

Delivery time : 1-5 days.

cnc HDPE machining part

HDPE

HDPE (High-Density Polyethylene) is a linear thermoplastic with excellent impact resistance and dimensional stability.Non-toxic and odorless, it is suitable for manufacturing valves, pump bodies, gears, sliding bearings, and as core material for surfboards.

Color : black,white.

Types : HI-HDPE, UV-HDPE, UHMWPE, Carbon Black-Filled HDPE.

Surface finish :Polishing, Sandblasting, Coating.

Delivery time : 1-5 days.

cnc HIPS machining part

HIPS

HIPS is a non-crystalline thermoplastic containing 5-15% rubber content, offering both high impact resistance and ease of processing. It features moderate surface hardness, low moisture absorption (0.05-0.7%), low cost, and suitability for complex structures. Widely used in appliance housings, food packaging, automotive interiors, and industrial piping, it replaces metal to meet lightweight and impact-resistant requirements.

Color : black.

Types : Impact-resistant HIPS, Brominated flame-retardant HIPS, Glass-fiber reinforced HIPS.

Surface finish :Polishing ,Sandblasting ,Coating.

Delivery time : 1-5 days.

Common Material Combinations:

PP Base + TPE Overmolding: Widely used in tool handles, daily necessities, etc.
ABS Base + Silicone Overmolding: Used for products requiring high-temperature resistance or food-grade contact.
PC Base + Soft PVC Overmolding: Used for electronic device housings, providing slip resistance and cushioning.
Metal Base + TPU Overmolding: Used for automotive components or industrial equipment, enhancing grip and impact resistance.

Surface finish for overmolding parts

Components produced through secondary injection molding often require multiple surface treatment processes to enhance their appearance and performance. Below, we introduce these treatment methods that can give components a fresh new look.

as machined finish

Machined finish

The prototype processed by the machine tool retains traces of tool machining.

anodizing finish

Anodizing

Anodizing enhances the corrosion and wear resistance of metals and enables coloring and coating, suitable for metals such as aluminum, magnesium, and titanium.

polishing finish

Polish

Polishing enhances surface finish and aesthetic appeal, suitable for materials such as metals, ceramics, plastics, and PMMA.

 

Sand Blasting finish

Sand blasting

Sandblasting involves propelling abrasive material at high pressure or mechanically onto a workpiece to achieve a clean, roughened, and matte finish.

brushed finish

Brushed finish

Brushed finish creates a textured pattern on metal surfaces, enhancing aesthetic appeal. Suitable for aluminum, copper, stainless steel, and other materials.

powder coating finish

Powder coating

Powder coating is applied to the workpiece surface via electrostatic adhesion, then cured at high temperatures to form a dense coating, enhancing the corrosion resistance of metal and plastic surfaces.

electropolish finish

Electroplating finish

Metal plating is deposited onto material surfaces through electrolytic processes to enhance corrosion resistance and wear resistance. This technique is suitable for metals and certain plastics.

black oxidize finish

Black oxidize

A black oxide coating is formed on metal surfaces through chemical oxidation, offering low cost, a simple process, and reduced light reflection.

electropolish finish

Electropolish

Removes microscopic protrusions from metal surfaces through electrochemical anodic dissolution, creating a smooth, dense surface free of residual stress and highly corrosion-resistant. Capable of processing complex metals and conductive materials.

Alodine finish

Alodine

Forms a protective coating on surfaces through chemical conversion, enhancing corrosion resistance and adhesion. Environmentally friendly with excellent conductivity, suitable for aluminum and magnesium alloys.

heat treatment finish

Heat treatment

By altering the internal microstructure of metallic materials through heating, this process enhances hardness, strength, toughness, and wear resistance. It is suitable for metals such as steel, aluminum alloys, copper alloys, and titanium alloys.

Overmolding capability

Forming Accuracy Dimensional tolerance ±0.05mm (general parts), ±0.02mm (precision parts), weight deviation of same-model products ≤1%
Production Efficiency Standard cycle time 30-90 seconds/mold, mold change time ≤25 minutes
Maximum Machining Size 500×400×200mm
Maximum Weight of Metal Insert 3kg
Substrate Preheating Temperature 80-120°C (metal), 40-60°C (plastic)
Melt Temperature Difference Control ≤10°C (to avoid internal stress)
Holding Pressure Gradient 60-80bar (segmented control)

Overmolding guideline

Testing Item Testing Standard Testing Method
Dimensional Accuracy ±0.05mm CMM Inspection
Adhesion ≥6N/mm² Peel Test
Color Difference ΔE ≤1.0 Spectrophotometer
Glue Overflow Not Visible Visual Inspection/Microscope
Defects No Bubbles, No Burn Marks Visual Inspection
Problem Cause Solution
Overmolding Detachment Material Incompatibility or Insufficient Temperature Select Compatible Material System, Increase Mold Temperature
Glue Overflow Insufficient Mold Closing Accuracy Check Clamping Force, Repair Mold
Bubbles First Shot Contains Moisture or Uneven Cooling Improve Drying, Increase Mold Temperature
Whitening at Joint Excessive Injection Speed Reduce Injection Speed, Improve Venting

Advantage of overmolding

Reduced assembly steps: Multi-component integrated molding eliminates adhesive bonding or mechanical connections, reducing labor costs by 40% in a specific automotive component case.
Enhanced product durability: Molecular-level bonding between materials boosts impact resistance by 200% and achieves weather resistance from -40°C to 80°C.
High design flexibility: Enables complex geometric structures and functional integration (e.g., sealing + anti-slip + conductivity in one part).
Flexible Material Combination: Supports metal/plastic and rigid/flexible material composites (e.g., Aluminum Alloy + TPU, PC + LSR)
Optimized Production Efficiency: Single-mold processing reduces logistics turnover; paired with SMED rapid mold change, shortens small-batch order lead times by 50%

Application of overmolding parts

Automotive Industry: Steering wheel multifunction buttons (PC+TPE), sensor seals (PA66+silicone)
Medical Devices: Surgical instrument grips (Stainless Steel 316+LSR), IV connector interfaces (ABS+soft rubber)
Consumer Electronics: Smartwatch straps (Aluminum Alloy+TPU), earphone charging cases (PC + silicone waterproof gasket)
Home Appliances: Coffee machine handles (PA66 + glass fiber + TPV), vacuum cleaner grips (PP + EPDM)
Industrial Components: Robot end effectors (aluminum alloy + rubber), sensor housings (PBT + sealing rings)

FAQ of Overmolding

How to resolve poor material adhesion issues?
① Increase contact area by laser etching the substrate surface (line width 50μm);
② Select compatible grades (e.g., Versaflex OM series specifically for PC/ABS overmolding);
③ Control mold temperature difference ≤10℃.
Does the metal substrate require preheating?
For aluminum/magnesium alloys thicker than 3mm, preheat to 120-150°C to prevent internal stress cracking in the overmolded layer due to rapid cooling.
What is the mold life for LSR overmolding?
Using S136 mold steel (hardness HRC 52-54) with silicone rubber-specific release agents achieves a lifespan exceeding 500,000 cycles.
How to calculate the optimal overmold thickness?
Follow the substrate thickness: overmolded layer = 3:1 principle (e.g., 2mm substrate corresponds to 0.6-0.7mm overmolded layer). Excessive thickness may cause sink marks, while insufficient thickness compromises bond strength.
How to achieve rapid mold change during mass production?
Employ SMED rapid mold change technology. Utilizing standardized mold locating pins (tolerance ±0.01mm) and a preheating system reduces changeover time to under 25 minutes.