• head_banner_01
  • News

how to repair vacuum flask

Thermos bottles have become a necessity in our daily life to keep beverages hot or cold for a long time. However, over time, they may experience issues such as leakage or loss of insulation efficiency. But don’t worry! In this blog, we’ll explore a step-by-step guide on how to restore your thermos to ensure it’s functioning optimally again.

Step 1: Gather All Necessary Materials

Before diving into the restoration process, make sure you have the following materials at hand:

1. Replacement Gasket: This is the rubber ring that helps maintain the vacuum seal.
2. Epoxy Adhesive: A high quality epoxy adhesive is essential to repair any cracks or leaks.
3. Cleaning Supplies: Mild dish soap, warm water, and a sponge or soft cloth are required to thoroughly clean the flask.

Step Two: Disassemble the Flask

To effectively restore your thermos, first disassemble it:

1. Remove the cap: Turn the cap counterclockwise until it comes off.
2. Remove the gasket: Carefully pull the gasket out of the groove. Watch for any signs of wear or damage that may require replacement.
3. Separate inner and outer layers: If your flask consists of two layers, unscrew the bottom part to separate them.

Step Three: Clean the Flask

Cleaning is a critical step in the restoration process as it removes any residue or dirt that may have affected the insulation of the flask. Please follow these guidelines:

1. Clean the inside and outside of the flask with warm water and mild dish soap. Avoid abrasive cleaners as they may scratch the surface.
2. Pay special attention to threads and grooves as they tend to collect dirt. Make sure all parts are thoroughly rinsed and soap-free.
3. Allow the flask to air dry completely before proceeding to the next step.

Step 4: Repair any leaks or cracks

If your thermos cracks or leaks, it is critical to fix these issues to restore its functionality:

1. Identify the source of the leak: Fill the flask with water and check for drips or leaks. Mark areas that need repair.
2. Apply epoxy adhesive: Using a toothpick or small brush, carefully apply epoxy adhesive to cracked or damaged areas. Make sure a thin, even layer covers the affected area. Avoid putting the adhesive inside the flask where it will come into contact with the drink.
3. Let the adhesive cure: Follow the directions on the epoxy adhesive package for recommended drying time.

Step 5: Reassemble the Flask

Once the repairs are complete, it’s time to put everything back together:

1. Insert new gasket: Insert the replacement gasket into the groove where the old gasket was located. Make sure it fits snugly to create a tight seal.
2. If your flask is a double layer design, screw the inner and outer layers together.
3. Turn the cover clockwise until it is securely in place.

By following this step-by-step guide, you can easily restore your thermos and extend its life. Regular maintenance and timely repairs will ensure your thermos remains in top condition, ready to serve you hot or cold beverages. Don’t let small issues get you down – with a little effort and the right materials, your thermos will be like new!


Post time: Aug-10-2023