How to Reduce the Size of Rubber Seals

Quck answer

Rubber seals can shrink over time due to exposure to heat, chemicals, or aging. To shrink rubber seals, follow these steps:

1. Clean the rubber seals: Use a mild detergent and warm water to remove any dirt or debris from the seals. This will help ensure a proper seal once they shrink.

2. Apply heat: Use a heat gun or hairdryer to apply heat directly to the rubber seals. Move the heat source back and forth to evenly distribute the heat. Be careful not to overheat or burn the rubber.

3. Test the seals: After heating, check the size of the rubber seals. If they have shrunk enough, they should fit tightly and securely. If not, repeat the heating process until the desired shrinkage is achieved.

4. Maintain the seals: To prevent further shrinkage, regularly clean and lubricate the rubber seals. This will help extend their lifespan and maintain their effectiveness.

By following these steps, you can effectively shrink rubber seals and ensure a proper seal for various applications.


Rubber seals have various applications, such as in car parts, plumbing, and home appliances. Over time, these seals can become loose and require resizing or replacement. Rubber polymer molecules possess unique properties that enable them to change their size when exposed to extreme temperatures. If you need to reduce the size of a seal, heating it can cause it to shrink.

Step 1

Fill a pot with hot water. Place the pot of water on the stove top and bring it to a boil.

Step 2

Submerge the rubber seal into the pot of boiling water for 1 minute. Using tongs, remove the seal from the water. Allow the seal to cool down to a temperature suitable for handling.

Step 3

Install the rubber seal to check if it fits properly. If it is still too large, repeat the process to further shrink it.

Step 4

If you need to shrink rubber seals that are already in place, use a heat gun. This will create an airtight seal.

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