Founded in 1978, Zhongde is a professional  focusing on OEM & ODM customized services. Based on 40 years technology deposition, we have developed a one-stop solution from mold designing and rapid prototyping to mass production. Our manufacturing capabilities include plastic injection molding service, compression molding service, CNC machining service, metal stamping service, 3D printing service, custom molding service,, etc.  

 

Zhongde can provide over-molding and  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,also named molding over molding. 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.

 

Guideline of Overmolding & Insert Molding

 

Insert molding injection 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.We also offer injection molding threaded inserts.

 

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 Overmolding & Insert 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.

 

Size	Metric	Inch
Length	2500	98.4
Width	2000	78.7
Height	1500	59

Available Material of Overmolding and In sert 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.

 

Overmolding & Insert Molding Plastic

 

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

 

Overmolding & Insert molding Rubber

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

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 & Insert 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.