How to produce latex condoms | Sagami Rubber Industries Co., Ltd.

How to produce latex condoms


Tapping of Rubber Latex

The low material, natural rubber latex is collected from rubber trees by tapping aslant on rubber trees early every morning.
In order to remove impurities from the collected rubber, the latex is processed in centrifuge.
For our condom production, only the highest quality & premium grade latex that passed severe tests will be used.



Compounding Process

After receiving inspection at our factory, several chemicals are compounded with latex. One important technical aspect of condom manufacturing is the ability to adjust the compounded chemicals in accordance with different conditions of latex.
Then, the latex and chemicals are heated and vulcanized to enhance strength, elasticity. In this way, the low material for condom manufacturing is produced.



Dipping Process

Glass molds move into the latex tank. Milky low material sticks to the surface of the glass molds. Then the coated glass molds moved to drying room. In order to assure consistent stability and strength, the dipping and drying process is repeated at least twice. Condoms are taken off from glass molds. Then you'll see the shape of condom that you know well.
The process environment is automatically controlled and latex in dipping tank is inspected periodically.



Pin-hole Testing Process

The manufactured condoms are tested through electric conductivity using the insulation characteristic of rubber.
Even an invisible hole can be detected, when the condom is placed on this testing machine. Then condoms are rolled up automatically.



Packing Process

Each rolled condom is rubricated and foiled one by one.
Also on this stage sampling test is done and non-conforming product is rejected.



Packing Process

Finally condoms are packed into consumer boxes. Each packet is weight checked.

Samples are selected at random for final inspection. Some severe tests are waiting for the finished products. Only lot passing the final inspection can be shipped.


Burst Test


Inflating condom and measuring volume and pressure at the bursting point. Over 30dm3 of air can be contained before bursting.

Tensile Test


Cut a ring from a condom, elongate the ring in a constant speed, then measure the elongation and strength at the breaking point.

Water Leakage Test (Visual)


Add water in a condom, suspend it from the testing machine, and inspect it for visual sings of leakage.

Water Leakage Test (Rolling)


Then roll the condom on a dry sheet of absorbent paper with applying pressure to check water leakage.