MIL PRF 131 K Class 1 Aluminium Foil VAL131HD High Strength Military Packaging Rolls + Valcross®
MIL PRF 131 K Class 1 Aluminium Foil VAL131HD High Strength Military Packaging Rolls + Valcross®
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This Military Packaging is an aluminium foil & PE construction with the addition of a high strength Valcross® membrane layer.
With the addition of Valcross® these flexible barrier materials feature an enhanced tear and puncture resistance as well as excellent moisture barrier properties.
VAL131HD™ is an ideal choice for large or awkwardly sized objects, particularly those with sharp edges.
Conforms with US military specification MIL-PRF-131 K Class 1, German Federal Armed Forces TL 8135-0003 & DIN 55 531 German industrial standard. Specification covers detailed requirements for barrier materials, ensuring they are water vaporproof, greaseproof, flexible, and heat-sealable.
We hold pre cut 1.0mtr, 1.25mtr & 1.50 mtr rolls in stock. Standard lengths are 200 linear mtr but a custom slit and rewind service is available. Flat cut sheets are also available to meet specific procurement requirements.
The tough construction of this MIL PRF 131 K Class 1 aluminium foil makes it the ideal choice for demanding export and asset preservation/storage projects. It is meticulously manufactured to be free from foreign matter and other imperfections, ensuring the highest quality and durability.
The combination of complementary materials in this mil spec packaging result in an effective moisture barrier that protects goods during transport and storage.
The tear and breaking strength is the highest in our range. Still it retains the very low moisture vapour transmission rate of 0.3g/m2 per 24 hours. This is one of a list of impressive characteristics seen on the data sheet of this material. The weakest direction is also assessed to ensure optimal mechanical properties.
The high performance nature of this extends to the inclusion of Valcross® in the laminate. This gives optimal strength whilst retaining excellent flexibility.
This barrier foil is available in several different widths supplied in a 200mtr log packaging roll. The user can cut to the desired dimensions allowing the component to be heat sealed and vacuum packed for its journey.
This type of Aluminium foil can be converted into liners flat bags & pouch packaging to suit components and precision parts.
It is ideal for use in heavy machinery transport/storage projects. It also meets the standard EU and BIR guidelines as well as MIL PRF 131 K class 1.
Requires Heat sealing with a compound aluminium foil sealer. Set to 210°c at 5 bars for 2-3 seconds. The specification number must be prominently displayed to ensure compliance and proper identification.
The suitable operating temperatures for this material are between -40°C to +70°C.
For optimal conditions we recommend you use this barrier foil in conjunction with desiccant. This will absorb excess moisture in transit.
For more information on how to calculate desiccant requirements please visit our desiccant estimate page.
Warning – Please note this material is intended to be used only by suitably trained professionals.
Overview of MIL-PRF-131K
MIL-PRF-131K is a military specification that covers the requirements for heat-sealable, greaseproof, flexible barrier materials with low water vapor transmission characteristics. These barrier materials are essential for military packaging, providing robust protection for a variety of applications. Whether wrapping electronic components, aerospace and military instruments, or machinery, MIL-PRF-131K ensures that the items are safeguarded against moisture and other environmental factors. The specification emphasises the use of laminated foil with polyethylene, ensuring a durable and heat-sealable barrier material that meets stringent military standards.
Performance Specifications and Requirements
MIL-PRF-131K Class 1 materials must adhere to rigorous performance specifications to ensure their reliability and effectiveness. These specifications include:
- Barrier Material: The material is a laminated foil with polyethylene, designed to provide a robust barrier against environmental factors.
- Class: Classified as Class 1, indicating its high-quality and suitability for demanding applications.
- Size: Typically available in 36”x200 yards, providing ample material for various uses.
- Heat-Sealable: Capable of being heat-sealed at temperatures of 500℉ or less, ensuring secure and reliable sealing.
- Water Vapor Transmission: Exhibits low water vapor transmission characteristics, crucial for protecting sensitive items.
- Puncture Resistance: Demonstrates high puncture resistance, withstanding up to 15 minutes of testing.
- Modulated Infrared Sensor: Maintains a maximum reading of .0005, ensuring minimal permeability.
- Low-Temperature Flexing: Withstands low-temperature flexing with a maximum reading of .03.
- Room Temperature Flexing: Exhibits excellent flexibility at room temperature with a maximum reading of .02.
- Double Seam Junction: Ensures no separation or leakage at the double seam junction, even under testing temperatures of 100℉ and 160℉.
- These stringent requirements ensure that MIL-PRF-131K Class 1 materials provide reliable protection in various conditions, making them ideal for military packaging.
Applications and Uses
MIL-PRF-131K Class 1 materials are widely utilised in the aerospace and defence industries due to their exceptional protective qualities. Some of the key applications include:
- Wrapping of Electronic Components: Protects sensitive electronic parts from moisture and environmental damage.
- Aerospace and Military Instruments: Ensures the integrity and functionality of critical instruments in harsh conditions.
- Machinery: Provides robust protection for machinery during transport and storage.
- Military Packaging: Meets stringent military specifications for packaging, ensuring the safe transport and storage of valuable assets.
- Protection Against EMI and RFI: Shields against electromagnetic interference (EMI) and radio-frequency interference (RFI), crucial for maintaining the performance of electronic devices.
- Moisture and Humidity Protection: Offers superior protection against moisture and humidity, ensuring the longevity and reliability of packaged items.
These versatile applications highlight the importance of MIL-PRF-131K Class 1 materials in maintaining the integrity and functionality of critical components in demanding environments.
Technical Data
- Constructed of micron PETP 12 μ | Aluminium 12 μ | White HDPE 75 μ
- Total Material thickness ~103 μ
- Material code VAL131HD.
Delivery Time
Dependent on quantities and format ordered. Log & jumbo foil rolls available from stock.
Product Specifications
What is Mil - PRF - 131 Class 1? As of to date (April 2022), the standard/specification has transitioned to Class 1 Mil - PRF - 131L. While retaining all qualifications of Class 1 Mil - PRF - 131K, the US QPD Naval Labs updated the standard to reflect the exclusion of Class 2 materials. These versatile materials lend themselves to tailored barrier bag solutions, perfectly conforming to your product specifications with efficiency. Whether in need of customised bags or rolls for smaller tasks, our offerings are adaptable. The inclusion of a Polyethylene inner layer enables easy sealing using handheld heat sealers, particularly those equipped with straight bar sealers delivering heat evenly (bottom to top). This facilitates the conversion of the material into modified Barrier bags with vapour protection against corrosion, including compliance with the Mil DTL-117 requirement. Mil - PRF – 131 Performance Specification The rigorous testing regimen mandated for Mil - PRF - 131 resources to attain registration with the US QPD Naval Labs ensures their reliability. All testing parameters must precisely match those of the final product, guaranteeing no unauthorised alterations that could jeopardise product integrity. Any deviation from the experimented material may lead to rejection and removal from the QPD. Testing procedures are conducted in an environment with 50 relative humidity ± 5% and a 73 ± 3 ℉ temperature. For Mil - PRF - 131 supplies to meet military specifications, they must successfully navigate stringent tests, including:
Once the testing for Mil - PRF - 131 compliance is cleared, additional requirements must still be met to satisfy military specifications. Every aspect, from the colour of the printed text to the way the material is utilised—whether in roll or bag form—must align with stipulated criteria for full compliance with military standards. This meticulous adherence to every specification ensures the material's suitability for military applications and underscores its reliability in safeguarding critical assets.
Mil – prf – 131k performance standards/specifications Not measurement precision
Performance specification Requirements- Qualification
Rolls must be 36 inches wide, with a tolerance between 1/4 and 1/8 inch, except if specified differently. The minimum length of roll components must be at least 200 yards. Moreover, individual rolls must reach a length of at least 195 yards. The material must be consistently coiled on nonreturnable cores with an internal diameter of at least 3 inches and a tolerance of 1/8 inch plus. The length of the core must correspond to the width of the roll components with a tolerance of + 1/8 inch, assuring stiffness to prevent deformation during use and shipping. Each roll must be properly bound to avoid unwinding.
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Frequently Asked Questions
• What exactly are VAL131 Laminated Foil Rolls and what's their primary purpose?
VAL131 Laminated Foil Rolls are a specialized barrier material, expertly constructed from a laminate of polyethylene, aluminum, and HDPE, specifically designed to offer robust protection against environmental factors. Their primary purpose is to safeguard sensitive items from moisture, grease, oxygen, and other contaminants during storage and transportation, particularly in demanding environments.
• What does "MIL-PRF-131 Class 1" signify when referring to VAL131 Laminated Foil Rolls?
When you see "MIL-PRF-131 Class 1" associated with VAL131 Laminated Foil Rolls, it means this material meets a stringent military specification set by the U.S. Department of Defense. This classification assures you that the foil is a high-quality, heat-sealable, greaseproof, flexible, and water-vapor-proof barrier material, suitable for critical military packaging applications.
• How do VAL131 Laminated Foil Rolls provide such strong barrier protection?
The exceptional barrier properties of VAL131 Laminated Foil Rolls stem from their multi-layered construction. The aluminum layer acts as an impermeable shield against moisture and oxygen, while the polyethylene and HDPE layers contribute to its flexibility, strength, and heat-sealable characteristics, creating a formidable defense against external elements.
• Are these foil rolls suitable for long-term storage of sensitive items?
Absolutely! VAL131 Laminated Foil Rolls are specifically engineered for long-term storage applications. Their extremely low water vapor transmission rate means they can maintain optimal conditions for moisture-sensitive products, even for extended periods, providing peace of mind that your items will remain in pristine condition.
• What's the typical construction of VAL131 Laminated Foil Rolls?
VAL131 Laminated Foil Rolls are typically constructed with a specific layering, often including a PETP (Polyester) layer, an aluminum layer, and a White HDPE (High-Density Polyethylene) layer, with a total material thickness of around 103 microns. This thoughtful combination ensures both strength and superior barrier performance.
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• For what types of goods are VAL131 Laminated Foil Rolls most suitable for protection?
VAL131 Laminated Foil Rolls are ideal for protecting a wide array of valuable and sensitive goods. This includes everything from heavy machinery and precision components to moisture-sensitive electronic equipment, military instruments, and other items requiring protection against corrosion, moisture vapor damage, oxidation, and contamination.
• Can I use VAL131 Laminated Foil Rolls for international shipping and export packaging?
Yes, they are perfectly suited for international shipping and export packaging. The robust nature and superior barrier properties of VAL131 Laminated Foil Rolls make them an excellent choice for safeguarding goods during transit, especially when exposed to harsh and varied climatic conditions across the global supply chain.
• Are VAL131 Laminated Foil Rolls effective for protecting items from salt spray in marine environments?
Indeed, they are highly effective. The comprehensive barrier created by VAL131 Laminated Foil Rolls actively protects packaged metals against corrosive damage caused by humidity, moisture, and importantly, salt spray, making them invaluable for sea transport and storage in coastal or marine environments.
• Can VAL131 Laminated Foil Rolls be used in conjunction with desiccants?
For optimal protection of extremely moisture-sensitive items, it is highly recommended to use VAL131 Laminated Foil Rolls in conjunction with desiccant products. The desiccant absorbs any residual moisture inside the barrier, creating an even drier, more protective environment for your goods.
• Is this material suitable for packaging delicate aerospace components?
Given its military specification and high-performance barrier properties, VAL131 Laminated Foil Rolls are indeed well-suited for packaging delicate aerospace components, offering the critical protection required against environmental factors during storage and transport.
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• Beyond large machinery, what other common items benefit from VAL131 protection?
Beyond heavy machinery, common items that greatly benefit from VAL131 protection include sensitive electronics, precision tools, various metal components (steel, aluminum, brass, iron, copper), and other industrial products that require robust protection against rust and degradation during extended storage or transit.
• How do I properly seal VAL131 Laminated Foil Rolls to create an effective barrier?
To create an effective and secure barrier, VAL131 Laminated Foil Rolls require heat sealing. It's recommended to use a compound aluminum foil sealer, typically set to a temperature of 210°C (410°F) at 5 bars of pressure for 2-3 seconds, ensuring a strong, hermetic seal.
• Can I make custom-sized bags or covers from VAL131 Laminated Foil Rolls?
Absolutely! The material's flexibility and heat-sealable nature mean it can be readily converted into custom barrier bags or covers tailored to fit products of various sizes and shapes, which is particularly useful for large or awkwardly dimensioned industrial items.
• What tools are needed for cutting VAL131 Laminated Foil Rolls?
For efficient and clean cuts, standard industrial cutting tools are typically used. While you can use heavy-duty scissors for smaller applications, a roll slitter or similar equipment would be ideal for larger scale projects or creating precise custom sizes from the roll.
• What are the recommended operating temperatures for VAL131 Laminated Foil Rolls?
VAL131 Laminated Foil Rolls are designed to perform reliably across a broad temperature range, with suitable operating conditions generally between -40°C to +70°C, ensuring their integrity in diverse climates.
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• How should I handle VAL131 Laminated Foil Rolls to prevent damage during use?
To prevent damage and ensure optimal performance, it's best to minimize unnecessary handling. If possible, bring the roll directly from the pallet to the sealing machine. If staging multiple rolls, use a staging bar or rest them on their side on a soft, smooth surface, always lifting by the core to avoid stressing edges.
• What is the typical water vapor transmission rate (WVTR) for VAL131 Laminated Foil Rolls?
VAL131 Laminated Foil Rolls boast an incredibly low water vapor transmission rate (WVTR), typically around 0.00005 g/100 sq in/24hr. This extremely low rate is a testament to its superior moisture barrier capabilities, which is crucial for protecting sensitive goods.
• How puncture resistant are VAL131 Laminated Foil Rolls?
This material exhibits high puncture resistance, designed to withstand significant testing, typically demonstrating resistance for up to 15 minutes. This robust quality ensures the integrity of the packaging even under demanding conditions.
• Does VAL131 Laminated Foil have good low-temperature flexibility?
Yes, VAL131 Laminated Foil is engineered for excellent performance across a wide temperature range, and it specifically maintains good flexibility at low temperatures, with a low-temperature flexing reading of typically 0.03 (maximum). This prevents cracking or pin holing when handled in colder environments.
• What is the typical breaking strength of VAL131 Laminated Foil?
VAL131 Laminated Foil demonstrates impressive breaking strength, typically around 50 minutes (lb/in) in its weakest direction, both when received and after aging, highlighting its durability and resilience.
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• Is VAL131 Laminated Foil resistant to oil and delamination?
Yes, the laminated structure of VAL131 is specifically designed to resist delamination and oil, ensuring that the integrity of the barrier is maintained even when exposed to these substances.
• What kind of seam strength can I expect from properly sealed VAL131 material?
When properly heat-sealed according to manufacturer instructions, VAL131 Laminated Foil forms strong and reliable seams that should not show any separation or leakage, even under various temperature and aging conditions, maintaining the protective integrity of the package.
• What military specification does VAL131 Laminated Foil Rolls meet?
VAL131 Laminated Foil Rolls meet the MIL-PRF-131 Class 1 military specification, assuring its compliance with the rigorous standards set for protective barrier materials used by the Department of Defense.
• Are VAL131 Laminated Foil Rolls manufactured with traceability information?
Yes, to ensure compliance and proper identification, MIL-PRF-131 Class 1 materials like VAL131 are typically printed with important information in lusterless red, including the material code, manufacturer, batch number, lot number, nomenclature, moisture transmission rate, and sealing guidelines, providing full traceability.
• What are the available roll sizes for VAL131 Laminated Foil Rolls from Valdamark Direct?
Valdamark Direct often stocks VAL131 Laminated Foil Rolls in common widths like 1.0 meter, 1.25 meter, and 1.50 meter, with standard lengths of 200 linear meters. They also offer a custom slit and rewind service for bespoke requirements.
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• How should VAL131 Laminated Foil Rolls be stored to maintain their quality before use?
To maintain their quality, VAL131 Laminated Foil Rolls should be kept clean, dry, and in their original packaging. Ideally, they should be stored in an environment around 70°F (21°C) with 50% relative humidity.
• Are there any restrictions on the number of splices allowed in a roll of MIL-PRF-131 material?
Yes, if supplied in roll form, MIL-PRF-131 compliant material should not contain more than three splices (meaning a maximum of four pieces), and each piece should not be less than 45 yards in length to ensure practicality and usability.
• Does the material need to be free from imperfections to meet the MIL-PRF-131 specification?
Absolutely. To meet the MIL-PRF-131 specification, the material must be free from any foreign matter, holes, tears, cuts, sharp creases, wrinkles, or other imperfections, ensuring the highest workmanship standards for critical military packaging.
• What information should be included on the tag or sheet provided with each roll of VAL131?
Each roll or package of VAL131 Laminated Foil Roll should have a clearly visible tag or sheet attached to the core, or inserted into the package, containing essential instructions for heat sealing using rotary, band, and jaw-type sealing equipment, including recommended parameters.
• Has the MIL-PRF-131 specification been updated recently, and does it affect VAL131?
Yes, the MIL-PRF-131 specification has been revised, most recently from MIL-PRF-131K to MIL-PRF-131L. While the material composition of VAL131 Laminated Foil Rolls remains consistent in its high-performance barrier properties, it's important to be aware of the updated specification number for compliance purposes.