Do Mylar Bags Really Block Light, Air, and Moisture? – We Tested It
Mylar Bags are popular due to their exceptional traits and unmatched characteristics. Custom Mylar Packaging Bags are frequently recommended as the best option for long-term food storage, product preservation, and packing delicate commodities.
Custom Mylar Bags Wholesale are crucial in the food packaging industry. But do they live up to the hype? Can these shiny, foil-like bags prevent light, air, and moisture, as advertised? We decided to put them to the test, and here’s what we learned.
What Are Mylar Bags Made Of?
Mylar Bags Wholesale are showstoppers in the packaging world. Their matchless traits make them amazing in the food packaging world. Before we go into the results, it’s necessary to understand what Mylar bags are constructed of. These bags are made of Bo PET (biaxially oriented polyethylene terephthalate), which is commonly coated with aluminum and other barrier elements.
This distinct structure provides Mylar packaging bags with great tensile strength, puncture resistance, and barrier qualities. These matchless traits make these packaging bags a perfect choice for long-term storage and preservation.
Customization of Mylar Bags involves making these pouches according to the product packed inside these bags. Packaging companies and their experts assist customers in selecting the right bags. Mostly, customers asked.
You can check this link if you are a bit confused about the size selection of Empty Mylar Packaging Bags wholesale. What is the Size of a Mylar Bag?
The Three Key Enemies of Storage: Light, Air, and Moisture
Long-term storage is compromised primarily by:
- Light can degrade vitamins, oxidize oils, and reduce product quality.
- Air (oxygen), which promotes spoilage and staleness.
- Moisture, which encourages the growth of mold, mildew, and bacteria.
Let’s explore how Mylar bags combat each of these elements.
Test #1: Light Blocking Capability: Do Mylar Bags Block Light?
Let’s check and test whether Custom Made Mylar Bags can block light and protect the packed stuff securely from high UV rays or not?
Objective: Determine whether Personalized Mylar Bags can successfully block visible and UV light.
Method: A sealed Mylar bag containing a bright LED flashlight was taken into a dark room.
No light escaped from the bag. Not even a faint glimmer. This demonstrates that high quality Mylar bags with a foil layer are completely opaque, successfully blocking out light while protecting light-sensitive items such as spices, medications, and freeze-dried meals.
Result: Pass. Mylar bags are effective light blockers. Custom Mylar Pouch Bags for Storage have light-blocking ability. You can easily store or preserve different edible items inside these bags.
Test 2: Air (Oxygen) Barrier Test: Are Mylar Bags Airtight?
The second test is the oxygen barrier test. Now we will check whether Mylar bags allow breathable storage.
Objective: Determine whether oxygen can pass through the bag over time.
Method: We enclosed an apple slice in a Mylar packaging bag with an oxygen absorber. A control apple was placed in a standard zip-lock bag. Both were kept at ambient temperature.
After seven days:
- Ziplock bag apple: visibly burnt and desiccated.
- Mylar Bag Apple: Significantly less browning, moisture retention, and negligible change.
Conclusion: A Mylar-sealed atmosphere with an oxygen absorber considerably reduced oxidation. The material has poor oxygen transmission rates (OTR), particularly when aluminum is placed inside. You can choose a custom heat seal Mylar bag or a custom vacuum sealed Mylar bag for long-term storage.
Result: Pass. Mylar bags are effective air barriers.
Test #3: Moisture Resistance: Are Mylar Bags Moisture Resistant?
The third test is the moisture resistance test. After passing the light and air resistance test, now check whether the Customized Mylar Packaging bags remain unaffected by the moisture.
Objective: Determine if Mylar bags can prevent moisture in a humid environment.
Method: Place a small dry cracker in a Mylar bag and another in a normal plastic bag. Both were placed in a humidity-controlled cage (75% RH).
After five days:
- The Plastic Bag Cracker became squishy and soggy.
- Mylar Bag Cracker remained crispy and dry.
This result demonstrates that Mylar bags provide greater moisture protection due to their low water vapor transmission rate (WVTR).
Result: Pass – Mylar bags are extremely moisture-resistant.
You can use customized Mylar pouches for the storage of dried items, like beef jerky and dry fruits etc. The moisture resistance ability keeps the crunch and protects the packed stuff from getting soggy.
How Effective are Mylar Bags for Storage?
Mylar bags are ideal for both long-term and short-term storage due to their sturdy, multi-layered barrier design. Here’s what makes them stand out:
Excellent barrier protection.
- Made of Bo PET with an aluminum foil coating.
- Blocks light, air, and moisture, the leading culprits of deterioration.
Long-term Shelf Life
- When combined with oxygen absorbers and heat-sealed, Heat sealed Mylar bags Wholesale can keep food for up to 25 years.
- Suitable for storing grains, beans, powdered meals, dry herbs, and emergency supplies.
Light Blocking Capability
- The aluminum layer prevents both UV and visible light.
- Light-sensitive objects are protected against degradation (for example, vitamins, herbs, and electronics).
Moisture and oxygen resistance
- Reduced oxygen transmission rate (OTR) and water vapor transmission rate (WVTR).
- Ensures that contents remain dry and fresh even in humid situations.
Versatile and Durable
- Available in a variety of thicknesses and widths.
- Puncture-resistant and convenient to store or travel with.
- Suitable for both business and residential use.
Common Use Cases
- Emergency food stockpile.
- Pharmaceutical and supplement packaging.
- Cannabis and Herbal Preservation
- Electronic and document protection
Custom Mylar Bags Near Me are an excellent storage solution, providing unparalleled protection and longer shelf life for a wide range of products. Explore the Effectiveness of Mylar Bags as a Food Preservation Method and see how these bags effectively store and preserve different edibles and food items in the retail market.
Mylar Bags vs Plastic Bags – Comparative Analysis
Here is a quick analysis of Polyester Mylar packaging bags with the ordinary zip lock or PVC bags used for packaging and storage purposes.
Feature | Mylar Bags | Plastic Bags (e.g., Ziplock, PE bags) |
| Material Composition | Multi-layered (Bo PET + Aluminum foil) | Single-layer polyethylene or polypropylene |
| Light Protection | Excellent – Blocks all visible and UV light | Poor – Usually transparent or translucent, allowing full light exposure |
| Oxygen Barrier | Very Low Oxygen Transmission Rate (OTR) | High OTR – Air easily penetrates |
| Moisture Resistance | Excellent – Low Water Vapor Transmission Rate (WVTR) | Moderate – Susceptible to humidity and leaks |
| Shelf Life for Food Storage | 5 to 25 years (with oxygen absorbers) | A few days to weeks, not suitable for long-term storage |
| Puncture Resistance | High – Especially in 5 mil+ thickness | Low to Moderate – Tears easily with sharp items |
| Heat Sealable | Yes – Requires heat sealer for long-term sealing | Somewhat – Only certain types; seals aren’t airtight or durable |
| Smell/Odor Barrier | Excellent – Smell-proof for cannabis, herbs, etc. | Poor – Allows scent leakage |
| Reusable | Yes – Can be reused if opened carefully | Yes – Often resealable with zippers |
| Eco-Friendliness | Not biodegradable, but recyclable options are available | Not eco-friendly, limited recyclability |
| Best Use Cases | Long-term food storage, herbs, electronics, and pharmaceuticals | Short-term food storage, household items, and basic packaging |
Where to Find Reliable Mylar Bags?
Looking for high-quality, tested Custom Mylar bags in USA? Custom Packaging House offers a wide variety of custom-sized, food-safe, and durable Mylar bags tailored for your storage and branding needs. Whether you’re packaging edibles, herbs, or industrial products, our bags are designed to perform.
Get your INSTANT PRICE QUOTE by sending an email to sales@custompackaginghouse.com. You can place your RUSH ORDERS by calling (307)2715170. If you are living in the USA and looking for affordable Mylar packaging bags near me, then you have found this place right option.
Here are some tips that may help you in shopping best and smart packaging bags near you. Shop Smart: Tips for Purchasing Mylar Bags Near Me
Summary
Custom Printed Mylar Bags Wholesale are highly effective for long-term storage, offering excellent protection against light, air, and moisture. Tested under real conditions, they proved to be airtight, moisture-resistant, and light-blocking. Ideal for preserving food, herbs, and sensitive items, Mylar bags extend shelf life and maintain product quality when properly sealed.
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