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https://www.zdcpu.com/services/overmolding-insert-molding/

Zhongde, a reputable plastic and rubber injection overmolding supplier in China, also manufactures customized China overmolding and China insert molding, with considerate services, to produce unique multi-material parts. Our production materials of custom over-molding and insert molding range from thermoplastic to elastomer-rubber, as well as metal and silicone. We've broken down the differences and similarities between the two processes. Let us help you decide which process is right for your project.

Both over-molding and insert molding injection processes by Zhongde, a reliable injection molding supplier, involve putting two types of materials together to make one part. And the inserts can be threaded metal inserts. Overmolding is a two steps process that one to create the substrate and one for the oversold that goes on top of it. Insert molding is a slightly faster process as it takes only one step that the two materials are molded at the same time.

If you want to know more information about introduction of injection, please contact us.

Guideline Of Overmold & Insertion Injection Moulding
Overmolding is a process where a single part is created using two or more different materials in combination. Traditonally, overmolding starts with injection molding a hard plastic resin that has a higher melting point. Once that part is cooled, another material is injection molded over the first part, resulting in a single, finished product.

Insert molding combines metal and plastic injection molding service into one single part. It allows plastic to bond to insert pieces, mostly brass or stainless steel metal component, which go inside a mold cavity. There are many options for insert that can be placed into the mold. A few of examples are warming labels, threaded bushings, wires, batteries, etc.

Size of Molding Over & Insert Injection Molding

Below table shows the size of Overmolding & Insert Molding parts we usually make. If you need a larger size, we can also help you achieve it.

SizeMetricInch
Length250098.4
Width200078.7
Height150059

Available Material of Injection Molding

In addition to the general materials listed below, Zhongde, a reliable custom injection molding company, can also modify the materials according to the special needs of customers. Our professional engineers will adjust the raw material formula to meet the unique conditions of use.

Plastic Overmolding & Insert Molding
ABS | Acrylonitrile Butadiene Styrene

PA 6 | Polyamide 6, Nylon 6

PA 6/6 | Polyamide 6/6, Nylon 6/6

POM | Acetal Polyoxymethylene, Delrin

PP | Polypropylene

PE | Polyethylene

LDPE | Low-Density Polyethylene

HDPE | High-Density Polyethylene

UHMWPE |Ultrahigh Molecular Weight Polyethylene

PTFE | Polytetrafluoroethylene

PEEK | Polyether Ether Ketone

PC | Polycarbonate

PMMA | Polymethyl Methacrylate, Acrylic

PS | Polystyrene

PVC | Polyvinyl Chloride (Shore D)

PU | Polyurethane

Silicone Rubber Overmolding & Insert Molding
NR | Natural Rubber

NBR | Nitrile Rubber

SBR | Styrene-butadiene Rubber

HNBR | Hydrogenated Nitrile

CR | Neoprene Rubber

VMQ | Silicone

LSR | Liquid Silicone Rubber

FVMQ | Fluorosilicone

FKM | Fluorocarbon

FFKM | Perfluorocarbon Rubber

EPDM | Ethylene-Propylene Diene Monomer Rubber

IR | Polyisoprene Rubber

IIR | Butyl Rubber

Additives of Overmolding & Insert Molding Injection

NameDescription
UV absorbersAbsorb UV radiation, slowing down the degradation of the material when used outdoors.
Flame retardantsPrevent ignition and inhibits spread of fire.
PlasticizersIncrease flexibility and promotes plasticity, reducing brittleness of the material.
ColorantsUsed to color plastics.
Carbon fibersIncrease strength, toughness, and rigidity of the material at the expense of making the material more brittle.
Glass fibersIncrease strength, toughness, and rigidity of the material at the expense of making the material more brittle. It is more flexible than carbon fibers.

Surface Finishing of Overmolding & Inserts Injection Molding

NameDescription
GlossyThe mold is smoothed and then polished with a diamond buff, resulting in parts with a mirror-like finish.
Semi-glossThe mold is smoothed with fine grit sandpaper, resulting in parts with a fine surface finish.
MatteThe mold is smoothed using fine stone powder, removing all machining marks.
Textured finishThe mold is first smoothed with fine stone powder and then sandblasted, resulting in a textured surface.
As-machined finishThe mold is finished to the machinist's discretion. Tool marks may be visible.