You might be using Mylar bags for storing food, medicine, cosmetics, etc. Are you getting the maximum benefits from these pouches? Perhaps not! Many homeowners and even some small business owners are not yet well aware of how to use Mylar bags effectively for long-term storage. This is also the repetitive question we hear at The Box Lane.
This blog is crafted for those who want to store products for long periods with Mylar bags. We are going to uncover the facts practically.
The Science Behind Mylar’s Protection
Mylar is composed of BoPET (biaxially oriented polyethylene terephthalate). This specific material provides Mylar with high tensile strength, chemical stability, and barrier properties toward gases, primarily oxygen. It possesses a layered structure where each layer performs a specific role. Collectively, these layers provide Mylar with a perfect protection barrier against physical damage and environmental degradation.
Outer Layer: Composed of BoPET, it provides stability and protection. This layer is resistant to heat, which helps the pouch be heat-sealed. Furthermore, it provides the bag with high tensile strength and puncture resistance needed for stability during shipping and handling.
Middle Layer: It is composed of aluminium foil. This is the layer that blocks oxygen, moisture, and light. These three are the primary culprits that cause degradation and spoilage to the stored items.
Inner Layer: It is composed of linear low-density polythene. This layer is made chemically inert and FDA-approved. The benefit is that the structure of the bag doesn’t interfere with the stored ingredients inside. It prevents contamination and leaching.
Tips for Long-Term Storage with Mylar Bags
From the above discussion, you must have got an idea that Mylar offers outstanding protection. This is the innate characteristic of Mylar: that it blocks environmental degradation elements. Here, we aim to amplify those protection benefits for effective long-term storage.
Let’s uncover them one by one.
Choose the Right Bag
Not all the Mylar bags are the same. There is a significant difference in the composition, structure, and materials. The bag manufactured for food storage might not be the same as one manufactured for electronics or CBD usage. The same is for size, printing, and thickness. Choose the bag that is compatible with your products. Here is what you have as an option:
Mil Thickness:
3.5–4 mil: Best for short-term storage of lightweight items.
5–7 mil: Perfect for long-term storage of everyday items.
7+ mil: Ideal for heavy and bulky items that need extreme durability.
Child Resistance: Choose a child-resistant design if you have to store something like medicine, cannabis, or sensitive items. This design ensures your products are protected from accidental exposure to kids.
Bag Style: You can choose from a stand-up pouch, window pouch, pillow pouch, etc., depending on your products and display needs.
Use Necessary Additives
Mylar alone might not ensure effective preservation. It is because some of the oxygen or moisture may remain in the pouch while filling it. That’s where the need for additives comes in. Here are some of the additives that you should consider including in the pouch, depending on the type of product that is stored inside.
Desiccants: Use desiccants or silica gel if you are storing something like electronics, 3D printer filament, and metal. These desiccants absorb the moisture and eliminate the risk of corrosion or damage.
Oxygen Absorbers: Use them if you are about to store food or organic products. These tiny packets contain powdered iron, which absorbs any residual oxygen. As a result, the stored items are protected from spoilage and degradation.
Anti-Static Shields: This shield is needed when you have to store computer chips or electronics. These electrostatic discharge shields ensure your items are protected from internal static charges and any outside stray charges.
Create a Perfect Seal
For a Mylar bag to create a fully controlled internal environment, the seal should be perfect. Some users think adding a zip-lock is enough. That’s not true at all. A seal is something that fuses the openings of Mylar perfectly. There is no chance of air stepping in or escaping. Here are the best practices to create a good seal.
Clean the Seal Area: This area includes the top 2 to 3 inches of the bag. Make sure there is no dirt, dust, or residue in that area when you are creating a seal.
Maintain high temperature: When you are using a heat-sealing method, ensure the temperature is around 375°F to 425°F (190°C - 218°C). A temperature less than this is not enough to create a durable seal.
Press for Sufficient Time: The dwell time for seal creation is about 2 seconds. Ensure you press the bag with an impulse heat sealer for at least 2 seconds. It will allow the bag to fuse and blend openings perfectly.
Test the Seal: Once created, check whether the seal is satisfactory. You can just press the bag and check the sound for air escape. If there is no hissing sound, the seal is good to go.
Choose the Right Storage Place
Once you have sealed your bag, you are half done. Now, you have to store it in a place where it is protected from physical and environmental damage simultaneously. We recommend choosing a place that is compatible with the following requirements:
Temperature: Choose a cool place with a temperature around 50℉ to 70℉.
Humidity: Choose a dry place with a very low humidity level.
Light: Choose a dark space that is away from direct sunlight exposure.
Apart from this, choose a place where there is 0% risk of exposure to rodents, pets, and birds. It is better to place your bags inside a container with a perfect lid. It ensures protection from mechanical damage.
Check for Regulatory Requirements
Nowadays, there are strict packaging requirements for each industry. Mylar bags must comply with those requirements. Be smart while saying YES to a manufacturing company. Check, and it is better if you can test the bags it is producing. Make sure the bags comply with all the regulatory requirements set by the industry dealing with those products. You can also ask for a licence, certification, or permit for that particular industry.
Here are some of the big names in this regard.
FDA Compliance: If you have to store food products, make sure the bags comply with the standards set by the U.S. Food & Drug Administration. Especially, you should confirm whether the inner layer is made of food-grade materials or not.
ISO Compliance: If you have to store pharmaceuticals or medical products, make sure they comply with ISO standards. It ensures the packaging doesn’t contaminate the products inside.
JEDEC: If you have to store electronics or computer items, make sure the bags are manufactured in compliance with the regulations of the Joint Electron Device Engineering Council. It ensures your electronics stay protected in the bag.
Final Words
When storing products long-term in Mylar bags, just scan the aforementioned tips. These practices ensure your products are protected from both physical and chemical damage. Be very careful while purchasing the pouches, and ensure the ones you get are compatible with what you have to store inside. If confused at any stage, contact the supplier to answer your queries.
If you are about to purchase Mylar bags for long-term storage of goods, you must consider The Box Lane. We will provide you with the bags according to your requirements and guide you on effective storage. Let’s store for decades together!
FAQs
Can Mylar bags be reused after they have been heat-sealed?
Yes, they can be reused if they are in good condition with no punctures. Make sure to clean the bag, dry it, and fill the available space. Once you fill it, seal it again and store it in a cool, dry place.
How would I know if my Mylar bag has a perfect seal?
You can check it by a visual test. When used with oxygen absorbers, the bag will pull tight against the stored items. Furthermore, if the seal is solid with fused bands and has no bubbles, it means the seal is in good condition.
Do Mylar bags protect against rodents and insects?
Yes, they protect from insects and rodents in many ways. First, Mylar has a high tensile strength and puncture-resistant design that most of the insects can’t break. Second, they block aroma and flavor within the pouch; there is no risk of insect attraction. When placed inside a closed container, they are totally protected from these tiny creatures.
Does a Mylar bag have an expiry date?
Yes, Mylar also has an expiry date. It depends on the items stored and the oxygen absorbers added. After a specific time, oxygen absorbers are used. Additionally, Mylar material can also decompose due to thermal and chemical effects with time.
Are all Mylar bags chemically inert?
Not all the Mylar bags are 100% chemically inert. Some industrial Mylar pouches use solvents or adhesives to laminate layers. These reagents can leach into the ingredients stored inside. Check your bag for 100% inertness at the buying stage.