Loctite 515 Vs Loctite 518 – Is Loctite 515 The Same As 518?

Loctite 515 and Loctite 518 are both anaerobic gasket sealants, but Loctite 518 has higher oil resistance and is suitable for rigid flange assemblies, while Loctite 515 is designed for flexible flanges and has lower viscosity. When choosing between Loctite 515 and Loctite 518, it’s important to consider the specific requirements of your application.

Loctite 515 is ideal for flexible flanges due to its lower viscosity, while Loctite 518 offers higher oil resistance and is best suited for rigid flange assemblies. Both products are anaerobic gasket sealants, but their distinct properties make them suitable for different types of flanges.

Understanding the specific needs of your flange assembly will help you determine which sealant will provide the best results.

Loctite 515 Vs Loctite 518



Loctite 515 and Loctite 518 are popular choices for sealing and bonding applications. Understanding their composition is crucial to determine their suitability for specific uses.

Ingredients In Loctite 515

  • Acrylic Ester Polymer
  • Polyglycol Dimethacrylate
  • Hydroxypropyl Methacrylate
  • Hydroxyethyl Methacrylate
  • Carbon Black
  • Aliphatic Hydrocarbon

Ingredients In Loctite 518

  • Methacrylic Ester Copolymer
  • 1,3-Propanediol Dimethacrylate
  • Hydroxypropyl Acrylate
  • Aliphatic Hydrocarbon

Application Areas

Loctite 515 and Loctite 518 are both high-performance sealants designed for a variety of industrial applications. Understanding their specific application areas can help businesses make informed decisions about which product to use for optimal results.

Industrial Uses Of Loctite 515

Loctite 515 is widely employed in industrial settings for its ability to provide instant low-pressure sealing for metal flanges.

This makes it an ideal choice for manufacturers in the automotive, aerospace, and marine industries. It is also favored for its compatibility with various gasket materials, further expanding its application scope.

Industrial Uses Of Loctite 518

Loctite 518 is particularly valued in industrial environments for its anaerobic gasketing capabilities, making it suitable for sealing close-fitting flanges.

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Its ability to seal rigid iron, aluminum, and steel flanges, as well as its resistance to high temperatures, positions it as a versatile solution for the automotive, heavy equipment, and power generation sectors.

Curing Time

Comparing Loctite 515 versus Loctite 518, the curing time for both products plays a crucial role in their effectiveness.

While Loctite 515 offers a faster curing time, Loctite 518 provides a more extended curing period, allowing for precision adjustments and repairs.

Selecting the right product depends on the specific application requirements and time constraints.

Curing Time Of Loctite 515

Loctite 515’s

curing time

is just 15 minutes.

Curing Time Of Loctite 518

In contrast, Loctite 518 takes up to

24 hours

to fully cure. Loctite 515 dries quicker at 15 minutes, while Loctite 518 requires a full day. Loctite 515 provides faster bonding with a curing time of just 15 minutes.

Loctite 518, on the other hand, has a longer curing process that takes up to 24 hours.

Loctite Curing Time
Loctite 515 15 minutes
Loctite 518 24 hours

Temperature Resistance

When it comes to choosing the right adhesive for your projects, considering its temperature resistance is crucial.

Two popular products in the market are Loctite 515 and Loctite 518. Let’s explore the heat resistance of each adhesive and determine which one suits your needs best.

Heat Resistance Of Loctite 515

Loctite 515 is a high-temperature gasket sealant designed for reliable performance under extreme conditions. This adhesive exhibits exceptional heat resistance, making it ideal for sealing applications that require durability in high-temperature environments.

With a continuous operating temperature range of -55°C to +200°C, Loctite 515 can withstand a wide range of temperature fluctuations without compromising its sealing capabilities.

The heat resistance of Loctite 515 is attributed to its advanced formulation, which includes a silicone-based compound. This compound allows the adhesive to maintain its flexibility and effectiveness even at elevated temperatures.

Whether you’re working on automotive engines, industrial machinery, or other applications that involve high temperatures, Loctite 515 can provide reliable sealing performance.

Heat Resistance Of Loctite 518

Similar to Loctite 515, Loctite 518 also offers impressive heat resistance properties. This anaerobic gasket sealant is designed to fill and seal gaps between mating surfaces, providing a reliable seal under extreme conditions

With a continuous operating temperature range of -55°C to +150°C, Loctite 518 performs well in applications that involve moderate to high temperatures.

Loctite 518’s heat resistance stems from its unique anaerobic curing mechanism, which allows the adhesive to form a tough and durable seal.

This makes it suitable for use in various industries, such as automotive, marine, and manufacturing, where high temperature and pressure conditions are common.

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NOTE: It is important to consider the specific temperature requirements of your project before choosing between Loctite 515 and Loctite 518. Always refer to the product datasheet and consult with the manufacturer for the most accurate information regarding temperature resistance.

Flexibility And Strength


When it comes to choosing the right adhesive for your project, considering both flexibility and strength is crucial.

In this article, we will compare Loctite 515 and Loctite 518, two popular adhesives known for their exceptional performance in various applications. Let’s dive into the flexibility and strength of these adhesives to help you make an informed decision.

Flexibility Comparison Between Loctite 515 And Loctite 518

When it comes to flexibility, Loctite 515 and Loctite 518 have distinct characteristics that make them suitable for different applications.

Adhesive Flexibility
Loctite 515 Achieves high flexibility, allowing it to withstand dynamic loads and vibrations without compromising the bond integrity. It offers excellent resistance to joint movement, making it ideal for applications where flexibility is paramount.
Loctite 518 Offers a balance between flexibility and rigidity, making it suitable for applications that require some degree of flexibility while maintaining a strong and durable bond. It provides reliable sealing and eliminates the need for gaskets, ensuring a tight and secure fit over time.

Strength Comparison Between Loctite 515 And Loctite 518

Strength is a critical factor to consider when selecting an adhesive. Let’s compare the strength characteristics of Loctite 515 and Loctite 518.

Adhesive Strength
Loctite 515 Delivers exceptional shear and tensile strength, ensuring a robust bond that withstands heavy loads and high-pressure environments. It provides long-lasting strength and durability, making it suitable for applications with demanding performance requirements.
Loctite 518 Offers high bond strength, allowing it to effectively seal and connect rigid parts with confidence. It forms a strong bond that withstands extreme conditions, such as temperature variations and chemical exposures.

By comparing the flexibility and strength characteristics of Loctite 515 and Loctite 518, you can choose the adhesive that best suits your specific application needs.

Whether you require maximum flexibility or unparalleled strength, Loctite offers a range of reliable adhesives to ensure your project’s success.

Loctite 515 Vs Loctite 518


Loctite 515 and Loctite 518 offer cost-effective solutions with their exceptional performance and durability. These versatile sealants provide reliable results, making them ideal choices for various applications.

Their affordable prices make them budget-friendly options for industries seeking efficient and cost-effective solutions.

Cost-effectiveness is key in choosing the right adhesive for your projects. Let’s compare the pricing of Loctite 515 and Loctite 518:

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Pricing Of Loctite 515

Loctite 515 offers a cost-effective solution for sealing metal flanges. It provides excellent resistance to heat and chemicals.

Pricing Of Loctite 518

Loctite 518 is slightly more expensive than Loctite 515. It is designed for flexible flanges and has high temperature resistance. In terms of cost,

Loctite 515

is a budget-friendly option for metal flanges. Meanwhile,

Loctite 518

offers a bit higher pricing due to its specific features. Consider your project needs and budget when selecting between the two options. Both products deliver reliable performance for your sealing applications.

User Preferences

Feedback On Loctite 515

Users have commended Loctite 515 for its exceptional bonding capabilities, especially on rigid substrates such as aluminum and steel. Many users have expressed satisfaction with its quick-curing formula, which increases assembly line efficiency.

Feedback On Loctite 518

Loctite 518 has received positive feedback for its excellent gap-filling properties, making it ideal for applications with uneven or rough surfaces. Users have praised its ability to seal metal flanges effectively, preventing leakage and offering long-term durability.

Frequently Asked Questions For Loctite 515 Vs Loctite 518

Is Loctite 515 The Same As 518?

No, Loctite 515 and 518 are not the same. They are different products used for different applications. Loctite 515 is a gasket maker while Loctite 518 is a medium-strength thread sealant. Each has its own specific purpose and should not be used interchangeably.

What Is Loctite 515 Used For?

Loctite 515 is used for anaerobic sealing of rigid, flat-faced flanges. It provides instant low-pressure sealing to prevent leaks.

What Is Loctite 518 Used For?

Loctite 518 is used for sealing rigid flange joints, such as gearboxes and engine casings. It provides a reliable seal against leakage and prevents corrosion. Its anaerobic formula cures in the absence of air and is ideal for metal assemblies.

What Is A Substitute For Loctite 518?

A similar substitute for Loctite 518 is Permatex Anaerobic Flange Sealant.


In selecting between Loctite 515 and Loctite 518, consider the specific needs and requirements of your project. Each has its unique strengths and applications.

To optimize your results, it’s vital to understand the differences and advantages of both products. Choose wisely based on your project demands.

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