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Making Underwater Electrical Connections Using Waterproof Heat Shrink

Often times it is difficult to create a waterproof electrical connection that will survive underwater. Traditional methods include potting, which takes a long time to set, or using underwater connectors, which can be expensive. Through much lab and field testing we have found that connections can be done in a short amount of time and in a cheap way using adhesive lined heat shrink. These steps will walk you through the process.

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Edit Step 1 Making Underwater Electrical Connections Using Waterproof Heat Shrink  ¶ 

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Edit Step 1 Making Underwater Electrical Connections Using Waterproof Heat Shrink  ¶ 

  • You are going to want to cut each piece of heat shrink so it is about 5mm longer than the solder joint on either side

Edit Step 2  ¶ 

Image 1/1: It is best to tin each wire before joining them.

Edit Step 2  ¶ 

  • Use caution when soldering electronic components. The temperatures are 500 degrees and higher. Eye protection is required.

  • It is best to tin each wire before joining them.

  • You want to avoid sharp points on your solder connection, or frayed wire.

Edit Step 3  ¶ 

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Edit Step 3  ¶ 

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Edit Step 4  ¶ 

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Edit Step 4  ¶ 

  • Set your heat gun temperature to at least 250°F (121°C).

Edit Step 5  ¶ 

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Edit Step 5  ¶ 

  • Make sure the inside lining is completely melted and oozes out each end.

You're Done!

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