How to Heat-Seal Mylar Bags for Long-Term Storage

How to heat seal Mylar bags with an iron, hair straightener or impulse sealer

When heat-sealing mylar bags, it is important to use the right tools for the job in order to achieve a secure and airtight seal. There are several ways of heat-sealing mylar bags that can be used depending on the size and type of bag being sealed and personal preference.  The three most commonly used heat-sealing options are clothing irons, impulse sealers, and hair straighteners/irons.

Clothing Irons

Clothing irons are the most common heat-sealing option for mylar bags, as they are readily available in homes and are easy to use. To heat-seal with a clothing iron, heat the iron to 400°F (205°C) or find the cotton or linen setting, place two pieces of mylar together or your closed bag, and press the iron on top. Make sure to apply pressure as you move the iron to create an airtight seal. It is important that the bag can lie flat and you are not creating wrinkles as you seal. Use the zipper on Habitual Heart mylar bags to ensure you can lie the bag down without the contents spilling out. Also, please ensure the steam function is not in use.

Impulse Sealers

Impulse sealers are high-heat electric tools designed specifically for heat-sealing mylar bags. They provide a heat level of up to 420°F (215°C), which is more intense than clothing irons, and provide an efficient seal. To heat-seal with an impulse sealer, place two pieces of mylar together and press down the handle to heat-seal the bag shut.

Hair Straighteners/Irons

Hair straighteners or irons are an alternative heat-sealing tool for mylar bags. To heat-seal with a hair iron, heat the iron to a setting as close to 420°F (215°C) and then press down on the bag while running the iron over the seal area. Again, apply pressure as you move the iron along for a secure heat seal. Some like to tap the iron as they move along larger bags. I like this method because not only is it convenient, it is the only method that allows you to seal a bag while it is standing up. With this method, finding a hair straightener with plates that make full contact with each other is very important.

Each heat-sealing method has pros and cons, so it is important to research and determine which heat-sealing tool will work best for your project. With the right tools and technique, heat-sealing mylar bags can be quick and easy.

Following these heat-sealing instructions guarantees a secure heat seal on every mylar bag you use. With the right tools and technique, heat-sealing mylar bags can be a breeze!

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