Xiamen Better Silicone Rubber Co., Ltd

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We make liquid injection molding and manufacture different kinds of liquid silicone rubber molded parts for medical device, sanitary & bathroom products, electrical products, cosmetics, automotive and machines parts etc. Our team also can offer LSR products parts moldabilities & over-molded manufacturabilities analysis or design support etc.

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Add: No. 165th, Tong'an Park, Industry Zone, Tona'An District, Xiamen City, China

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Overmolding Rubber To Metal

Overmolding Rubber To Metal is also known as rubber to metal bonding, glue rubber to metal, bonding rubber to metal, adhesive for rubber to metal etc.,which is a elastomer to substrate bonding project -- vulcanizing elastomer rubber materials with one or two component primer/glue/adhesive compositions pre-coating to various type of metal substrates.
Rubber overmolding has widely range applications from bonding natural rubber,nitrile rubber, fluororubber to metals substrates including steel, stainless steel, nickel,alloys, plated metals, aluminum.
Quantity:
  • Silicone Overmolding
  • BT
  • 3506919090

Rubber To Metal AdhesiveGlue Rubber To MetalRubber Overmolding Prototypes


Overmolding Rubber To Metal is also known as rubber to metal bonding, glue rubber to metal, bonding rubber to metal, adhesive for rubber to metal etc.,which is a elastomer to substrate bonding project -- vulcanizing elastomer rubber materials with one or two component primer/glue/adhesive compositions pre-coating to various type of metal substrates.

Rubber overmolding has widely range applications from bonding natural rubber,nitrile rubber, fluororubber to metals substrates including steel, stainless steel, nickel,alloys, plated metals, aluminum etc.,


rubber to metal overmolding

adhesive for rubber to metal




Overmolding Rubber To Metal Manufacturing Process


The Process Of Overmolding Rubber To Metal 

Bonding rubber to metal manufacturing process involves four procedures as following.


1. Metal surface/ Substrate surface preparation

The surface of the metal inserts have to be a bit rough and free of oil and contaminate to improve a robust bond. The phosphate dip can be applied to remove all the machine oil and keep the great surface of rubber bonding, this is the cheapest way to deal with the metal surface and also provide the rust inhibition, but not the best one.

There are some other plating or coating will offer better rust inhibition than phosphate dip, such as hexavalent chromate, but due to the temperature in molding process will degrade the plating.


2. Pre-coating the primer to metal

It is necessary to coating primer for rubber to metal glue molding process to bond to the metal substrate and enhance rubber bonding. This operation will combine rubber and metal more precisely and firmly and short the deviation of whole part.


3. Coating the adhesive to metal

The common way to apply adhesive are as follows: dip and dry, spin coat, use machine to spray adhesive automatically and spray manually.

Dipping and spinning is cheaper way when metal substrates all should be wrapped with rubber, but it is not suitable for the application case that the metal parts need to be exposed and will directly contact with the mold. The manual spraying also is cost effective solution than the automated spraying when the quantity is not that large.  


4. Placing the metal inserts into the mold cavities

The production efficiency is determined on the metal insert part dimension and volume of the parts. The first is the positioning of the metal insert parts, second pay attention to adjust the mold temperature and pressure to meet the best bonding rubber to metal.   


Glue Rubber To Metal

Overmolding Rubber To Metal

Metal Insert Overmolding Process

Overmolding Rubber To Metal Design Guide

   Better Silicone - Custom Metal to Rubber Bonding Experts


There are mainly four overmolding ways

Compression Molding

Transfer Molding

Plastic Injection Molding

Liquid silicone rubber injection Molding LSR&LIM 

The most effective way to stick/glue/adhesive/adhere/attaching rubber to metal is use injection molding and transfer molding manufacturing process. The process require a two step preparation of the metal prior to molding the rubber.

It is a big challenge to design a elastomer rubber part which required bonding with metal component, so the following items need to be considered carefully when design the bonding rubber to metal parts.

1. Need Which Rubber Material?

2. What Is The Substrate?

3. Which Bonding Type Required?

1)Encapsulation

2)Chemical Bonding With Glue/Adhesive

3)Gluing After Curing

4.Glue/Adhesive Testing

 

1. How to choose rubber material type?

Better Silicone use currently market common rubber and thermoset material to give the rubber type solutions in manufacturing process. Blow is the physical property table guide for the popular rubber bonding material.It is just a rough guide from Better Silicone--contact us, our engineer team will offer expert assistance with selecting the suitable rubber overmolding material for application case.

MATERIAL

ABBREVIATION

VIBRATION
ISOLATION

RELATIVE PRICE

TEMPERATURE RANGE

OZONE, UV RESISTANCE

OIL RESISTANCE

Natural

NR

Excellent

Good

-60F to 220F

Poor

Poor

Butyl

IIR

Excellent

Fair

-75F to 250F

Good

Poor

Ethylene-P

EPDM

Good

Excellent

-70F to 250F

Excellent

Poor

Nitrile

NBR

Good

Good

-30F to 250F

Poor

Excellent

Neoprene / Chloroprene

CR

Excellent

Excellent

-60F to 220F

Good

Fair

Silicone

VMQ

Good

Fair

-175F to 450F

Excellent

Fair

1. Which Substrate Material Required To Be The Mating Part?

When we choose the Substrate Material for Rubber Mating part, we need to consider the following conditions of Substrate Options.


1) Temperature to be considered in bonding rubber to metal molding

For example,rubber needs to be vulcanized at above 200-300degree, such temperature require any substrate chosen for chemical adhesion need to withstand such high temperature for a period of time, which most of the plastic material cannot survive because of the low melting point. Thus, silicone plastic overmolding need to pay more attention to such material substrate issues.


2) Metal Substrates Surface Treatment Before Glue Rubber To Metal

Before rubber bonding process, metal substrates surface need to be cleaned by chemical agent and make them dry, to prevent the metal surface from oil strained &oil contamination and oxide layer etc., then coating the primer by painting or spraying then also make the primer dry, generally rubber material can not self-adhesive with substrate, so proper glue or primer should be applied to the metal substrates.  

 

3) Consideration of Bonding Type To Metal  

After confirmed the rubber material and metal inserts substrate, the bonding type is the issue to consider. Including the cost effective solution, bonding strength requirement, the impact and direction force as well as position in bonding. Different bonding type have a variety of applications in rubber overmoulding products.


4) Necessary Testing For Adhesive Force

After overmolding rubber to metal, the testing experiment of the adhesive force is required for knowing the actual bond/tear strength of the rubber with metal. Generally the rubber to metal adhesive tear strength should be stronger than rubber itself. Better Silicone will help to confirm good bond on the finished product.


Rubber Overmolding PrototypeLow Volume Solutions


The Rubber to Metal Bonding Process Two Step Process

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