Zhongde (Beijing) Machinery Equipment., Ltd.

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Custom Overmolding & Insert Injection Molding Services

Zhongde can provide over-molding and insert molding to produce unique multi-material parts. Our production materials range from thermoplastic to elastomer-rubber, as well as metal. 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 processes involve putting two types of materials together to make one part. 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.


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Overmolding & Insert Molding
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 plastics 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 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


Name

Description

UV absorbers

Absorb UV radiation, slowing down the degradation of the material when used outdoors.

Flame retardants

Prevent ignition and inhibits spread of fire.

Plasticizers

Increase flexibility and promotes plasticity, reducing brittleness of the material.

Colorants

Used to color plastics.

Carbon fibers

Increase strength, toughness, and rigidity of the material at the expense of making the material more brittle.

Glass fibers

Increase 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


Name

Description

Glossy

The mold is smoothed and then polished with a diamond buff, resulting in parts with a mirror-like finish.

Semi-gloss

The mold is smoothed with fine grit sandpaper, resulting in parts with a fine surface finish.

Matte

The mold is smoothed using fine stone powder, removing all machining marks.

Textured finish

The mold is first smoothed with fine stone powder and then sandblasted, resulting in a textured surface.

As-machined finish

The mold is finished to the machinist's discretion. Tool marks may be visible.


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