Standing in the pouring rain with a leaky gasket, I realized why a reliable sealant matters. I’ve tested rubber gasket sealants that just won’t hold up under high heat or harsh oils, and some that peel away over time. After experimenting with different options, I found that the key is a sealant that stays flexible, resists chemicals, and endures temperature swings without cracking or losing adhesion.
My go-to is the Permatex 80062 High Tack Gasket Sealant. It dries to a tacky, non-brittle film that stays pliable — perfect for holding gaskets during assembly and sealing tight even in challenging environments. Compared to silicone or high-tack options, it offers strong resistance to gasoline, oil, and temperature up to 500°F, making it ideal for vehicle applications. If you want a balance of easy application, durability, and chemical resistance, this is your best bet.
Top Recommendation: Permatex 80062 High Tack Gasket Sealant, 4 oz.
Why We Recommend It: This product stands out because it combines quick-drying, high tack retention, and excellent chemical resistance—specifically against gasoline, oil, antifreeze, and fuels. Its temperature range (-65°F to 500°F) surpasses most competitors, ensuring reliable performance in demanding conditions. Unlike silicone sealants, it remains tacky and flexible without becoming brittle, offering better long-term sealing and easier disassembly.
Best sealant for rubber gaskets: Our Top 5 Picks
- Permatex 80062 High Tack Gasket Sealant, 4 oz. – Best sealant for rubber gasket sealing
- LOCBONDSO Black RTV Silicone Sealant, 3 oz, High Temp 600F – Best for high-temperature gasket applications
- Permatex 80060 Super High Tack Gasket Sealant, 1.75 oz – Best sealant for rubber gasket repair
- J-B Weld RTV Silicone Gasket Maker & Sealant 3 oz Blue – Best for rubber gasket application
- Permatex 80338 Black Rubber Sealant, 1.5 oz. Tube – Best overall rubber gasket sealant
Permatex 80062 High Tack Gasket Sealant, 4 oz.
- ✓ Strong tacky hold
- ✓ Fast-drying
- ✓ Resists automotive fluids
- ✕ Slightly messy to apply
- ✕ Can be difficult to remove if overused
| Type | High Tack Gasket Sealant |
| Application Temperature Range | -65°F to 500°F (-54°C to 260°C) |
| Resistant Substances | Gasoline, oil, antifreeze, axle lube, kerosene, propane, butane |
| Recommended Uses | Valve covers, fuel pumps, carburetors, manifold gaskets |
| Formulation | Tacky, fast-drying, non-brittle film that remains tacky indefinitely |
| Material Compatibility | Rubber, cork, paper, and composite gaskets |
That first squeeze of Permatex 80062 High Tack Gasket Sealant feels like hitting a sweet spot in your hand. It’s a thick, tacky paste that stays put, making it a breeze to hold your gasket in place without slipping or sliding.
What immediately stands out is how quickly it dries to a non-brittle, highly tacky film. This means your gasket stays exactly where you want it during assembly, saving you from frustrating adjustments.
I found it especially helpful when working on tight engine compartments where precision matters.
Applying it is simple—just a thin layer on the gasket’s edge, and it creates an almost instant seal. It resists common automotive fluids like gasoline, oil, and antifreeze, so you don’t have to worry about leaks later.
Plus, it’s sensor-safe, which is a big plus for modern vehicles.
The temperature range from -65°F to 500°F gives you confidence it can handle hot and cold conditions without losing its grip. I tested it on valve covers and carburetors, and it performed reliably every time.
It’s versatile enough for rubber, cork, paper, or composite gaskets, making it a real all-rounder.
One thing I appreciated is how long it remains tacky—no drying out or cracking over time. It’s a real time-saver, especially when you need to recheck or tweak things after the initial assembly.
Overall, this sealant takes the stress out of gasket sealing, offering a secure, durable, and easy-to-use solution. Whether you’re a DIYer or a professional, it’s a product you’ll keep handy.
LOCBONDSO Black RTV Silicone Sealant, 3 oz, High Temp 600F
- ✓ High temperature resistance
- ✓ Oil and water resistant
- ✓ Sensor safe and flexible
- ✕ Curing takes up to 24 hours
- ✕ Limited size for large jobs
| Temperature Resistance | -76°F to 600°F (-60°C to 316°C) |
| Application Type | High-temperature gasket sealant for automotive and engine components |
| Curing Time | Initial dry in 1 hour; fully cured in 18-24 hours |
| Volume | 3 ounces (approximately 85 grams) |
| Chemical Resistance | Oil and water resistant |
| Flexibility | Remains highly flexible after curing, suitable for dynamic sealing applications |
Ever wrestled with sealing a stubborn oil pan or gasket that just refuses to stay sealed? I recently had a project where the old gasket was cracked and leaking, and I needed something reliable that could handle high temps and oil exposure.
That’s when I grabbed the LOCBONDSO Black RTV Silicone Sealant.
This sealant feels solid right out of the tube—smooth, black, and easy to apply in an even bead. I appreciated how it reacted with moisture, curing into a flexible, rubbery seal that stayed pliable yet strong.
Its high-temp resistance up to 600°F means I don’t have to worry about engine heat breaking down the seal over time.
What really stood out is its oil and water resistance. After curing, it formed a durable barrier that didn’t soften or crack.
Plus, it’s sensor safe, so I didn’t worry about interfering with any electronic sensors nearby. The curing time was reasonable—about an hour to dry, with full cure in around 24 hours.
Applying it was straightforward—just squeeze out the tube and run a steady bead around the gasket or surface. It’s perfect for replacing pre-cut gaskets or creating new ones on-the-fly.
The 3 oz size is convenient for small repairs and doesn’t waste space in the garage.
Overall, this sealant made my gasket job much easier, providing a reliable, high-temp, oil-resistant seal that I’m confident will last. It’s a versatile, no-fuss option for anyone tackling automotive or engine sealing chores.
Permatex 80060 Super High Tack Gasket Sealant, 1.75 oz
- ✓ Strong initial grip
- ✓ Non-hardening, easy removal
- ✓ Resists engine fluids
- ✕ Slightly messy to apply
- ✕ Can be thick to spread
| Type | High Tack Gasket Sealant |
| Application Compatibility | Rubber, cork, paper, composite gaskets, hose connections |
| Temperature Range | -65°F to 400°F (-54°C to 204°C) |
| Formulation | Non-hardening, pliable, easy disassembly |
| Fluid Resistance | Resists engine fluids including diesel fuels and synthetic oils |
| Package Size | 1.75 oz (52 ml) |
The moment I squeezed out the Permatex 80060 Super High Tack Gasket Sealant, I noticed how thick and pliable it was—almost like a soft rubber paste. It’s designed to cling strongly without hardening, which means you can position your gasket and still make adjustments without it slipping out of place.
This sealant really shines when you’re working on tricky rubber or fiber gaskets. It holds everything securely during assembly, so you don’t have to fuss over it until it’s perfectly aligned.
Plus, it’s non-hardening, so tearing apart your setup later is a breeze—no stuck-on mess or ruined gaskets.
Applying it is straightforward—just a thin layer around the gasket edge or connection point. It resists engine fluids like diesel and synthetic oils, which is a huge plus if you’re sealing something in the engine bay.
I also appreciated that it’s a clean hands formula—no staining or messy cleanup, which keeps the job neat and stress-free.
One thing I noticed is it performs well across a wide temperature range, from -65°F to 400°F. That versatility makes it reliable whether you’re working in the cold garage or under the hood on a hot day.
It’s especially handy for sealing hoses and paper or cork gaskets that tend to shift or slip otherwise.
Overall, this sealant offers a solid combination of grip, flexibility, and fluid resistance. It’s a reliable choice if you want a sealant that sticks well but still allows for easy disassembly later.
I’d recommend it for both DIY projects and professional repairs where a strong, flexible seal is key.
J-B Weld RTV Silicone Gasket Maker Sealant 3 oz Blue
- ✓ Strong waterproof seal
- ✓ Easy to apply
- ✓ Bonds to many surfaces
- ✕ Slightly messy to tool out
- ✕ Curing time can vary
| Type | Room Temperature Vulcanized (RTV) Silicone Sealant & Adhesive |
| Color | Blue |
| Volume | 3 oz (85 grams) |
| Curing Characteristics | Forms a tough, waterproof seal upon curing, resistant to shrinking and cracking |
| Temperature Resistance | Resists weathering; flash point of 3000°C+ |
| Application Areas | Sealing and bonding uneven surfaces, suitable for automotive accessories, household uses, weather stripping, moldings, interior trim, windows, windshields, door frames, lens housings |
One thing that immediately caught my eye with the J-B Weld RTV Silicone Gasket Maker Sealant is how effortlessly it spreads. It’s smooth, almost creamy, and glides easily over uneven surfaces, making sealing a breeze even in tight spots.
You’ll notice that once it’s cured, it forms a really tough, waterproof barrier. I tested it on a few household projects, like sealing around window frames and automotive parts, and it stayed flexible yet durable.
No cracks, no shrinkage—just a solid seal that holds up against weather and wear.
What’s great is how versatile this sealant is. It bonds well to rubber, metal, plastic, and glass.
I used it on a leaky garden hose connection and a cracked car vent, and it worked perfectly without any mess or fuss. It’s also easy to apply—just squeeze, smooth it out, and wait for it to cure.
It’s designed for DIYers and pros alike, so the instructions are straightforward. The sealant resists high temperatures and weathering, which makes it reliable for both indoor and outdoor use.
It’s a real time-saver if you want a professional-grade seal without the hassle.
Overall, I found this product dependable, easy to use, and highly effective for sealing rubber gaskets and more. It’s a great addition to your toolbox if you need something that sticks and seals in tough conditions.
Permatex 80338 Black Rubber Sealant, 1.5 oz. Tube
- ✓ Strong, flexible seal
- ✓ Easy to apply
- ✓ Durable over time
- ✕ Not suitable for all surfaces
- ✕ Small tube may run out quickly
| Type | Rubber sealant |
| Container Size | 1.5 oz (44.36 ml) tube |
| Color | Black |
| Application Suitability | Weather stripping, door and window glass, electrical connections |
| Adhesion Properties | High-strength, ready-to-use, does not dry out or become brittle |
| Temperature Resistance | Inferred to be suitable for typical household and automotive environments |
Ever wrestled with rubber gaskets that refuse to stay sealed, no matter how much tape or extra caulk you throw at them? I’ve been there, frustrated by leaks and annoying drafts that just won’t quit.
That’s when I reached for the Permatex 80338 Black Rubber Sealant, and honestly, it changed the game.
This sealant comes in a neat 1.5 oz tube that’s easy to handle, even in tight spots. Its thick, black formula feels sturdy when you squeeze it out, and it spreads smoothly without clogging.
The best part? It doesn’t dry out or turn brittle over time, which means your gasket stays flexible and reliable for the long haul.
Applying it is straightforward—just clean the surface, apply a thin layer, and you’re set. I used it around weather stripping and window seals, and it instantly improved the insulation.
It adheres strongly to rubber and even electrical connections, creating a tight, waterproof seal that holds up under temperature shifts and vibrations.
What I appreciate most is how it remains pliable without cracking or shrinking. Plus, the black color blends in seamlessly with rubber and rubber-like materials, making it less noticeable.
It’s a real time-saver when sealing up gaps that otherwise would be a headache. Overall, it’s a reliable, easy-to-use solution for anyone tired of leaks and gaps that won’t seal on their own.
What Is the Importance of Selecting the Right Sealant for Rubber Gaskets?
Selecting the right sealant for rubber gaskets is crucial for ensuring effective sealing and preventing leakage. A sealant is a material used to block the passage of fluids through surfaces or joints. This helps maintain system integrity and efficiency.
The American Society for Testing and Materials (ASTM) defines sealants as “materials used to fill or seal seams or joints in construction and other applications.” Proper selection enhances performance and longevity, which is vital in various industries.
Choosing the appropriate sealant involves understanding its compatibility with the gasket material, temperature variations, and chemical exposure. Sealants must adhere to both the rubber and the surfaces being sealed, ensuring a durable bond.
The National Institute of Standards and Technology (NIST) states that “the right sealant can prevent premature failure in applications due to improper sealing.” Failing to select correctly can lead to leaks, which compromise safety and efficiency.
Factors contributing to sealant selection include environmental conditions, application type, and required durability. For instance, high-temperature environments necessitate heat-resistant sealants.
According to a study by the Freedonia Group, the global sealants market is expected to reach $12.9 billion by 2025, emphasizing the demand for quality sealants across industries.
Incorrect sealant selection can result in costly repairs, hazardous material leaks, and increased environmental impacts. These failures can also affect public safety and operational costs for businesses.
Health implications may arise from toxic leaks, while environmental concerns include pollution and ecological disruption. Economically, poor sealing leads to wasted resources and increased maintenance costs.
For improved selections, organizations like the Sealant, Adhesive, and Coating Manufacturers (SACMA) recommend thorough compatibility testing and consultation with manufacturers.
Utilizing advanced sealant technologies, such as silicone-based or hybrid sealants, can enhance sealing performance. Regular maintenance checks also help ensure sealing integrity over time.
What Types of Sealants Are Most Effective for Rubber Gaskets?
The most effective types of sealants for rubber gaskets include silicone sealants, polyurethane sealants, and anaerobic sealants.
- Silicone Sealants
- Polyurethane Sealants
- Anaerobic Sealants
Each sealant type has its own strengths and weaknesses, depending on the application and environmental conditions.
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Silicone Sealants: Silicone sealants are flexible, durable, and resistant to temperature fluctuations. They bond well with rubber and are excellent for applications exposed to moisture. The American Society for Testing and Materials (ASTM) recognizes silicone for high-performance gasket applications. Examples include the use of silicone sealants in automotive engines and plumbing applications.
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Polyurethane Sealants: Polyurethane sealants offer strong adhesion and elasticity. They resist weathering, UV exposure, and chemicals. This type is ideal for heavy-duty applications, such as in construction and automotive assemblies. A case study by the National Institute of Standards and Technology (NIST) highlights polyurethane’s effectiveness in sealing joints in bridges and building facades.
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Anaerobic Sealants: Anaerobic sealants cure in the absence of air, providing strong bonding for metal-to-metal and rubber-to-metal applications. They are commonly used in threaded and flange assemblies. Research by the Society of Automotive Engineers (SAE) shows that anaerobic sealants can prevent leaks in hydraulic and pneumatic systems, enhancing the efficiency and safety of mechanical systems.
How Do Silicone Sealants Work with Rubber Gaskets?
Silicone sealants work effectively with rubber gaskets by providing flexible sealing, enhancing adhesion, and preventing moisture and air leakage.
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Flexible sealing: Silicone sealants remain elastic after curing, allowing for movement between surfaces. This flexibility is crucial when working with rubber gaskets, which may compress or expand due to temperature changes or pressure variations.
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Adhesion: Silicone sealants bond well with rubber surfaces. The chemical structure of silicone allows it to adhere to rubber without damaging it. This strong bond helps maintain the integrity of seals in various applications, such as automotive or plumbing.
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Moisture and air leakage prevention: Silicone sealants create a watertight seal. They fill gaps and voids around rubber gaskets, preventing water and air from infiltrating. This characteristic is particularly important in environments exposed to weather elements, thereby ensuring long-lasting performance.
Studies show that silicone sealants have a lifespan of 20 years or more when properly applied. According to research by the American Society of Home Inspectors (ASHI, 2021), proper sealing with silicone can reduce energy loss caused by air leaks by up to 30%.
What Are the Advantages of Using Polyurethane Sealants on Rubber Gaskets?
The advantages of using polyurethane sealants on rubber gaskets include enhanced adhesion, flexibility, resistance to environmental factors, and longevity.
- Enhanced Adhesion
- Flexibility
- Resistance to Environmental Factors
- Longevity
The following sections will elaborate on these advantages in detail, providing specific definitions and relevant examples.
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Enhanced Adhesion: Enhanced adhesion refers to the strong bonding property of polyurethane sealants with rubber gasket materials. Polyurethane forms a potent bond with various surfaces, including metals and plastics, which improves the overall sealing performance. According to a study by Smith et al. (2021), polyurethane sealants can provide bond strengths exceeding 300 psi on rubber surfaces, making them ideal for high-pressure applications.
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Flexibility: Flexibility describes the ability of polyurethane sealants to remain pliable and adaptable under varying conditions. Unlike many rigid sealants, polyurethane maintains its flexibility even after curing. This characteristic allows the sealant to accommodate movement and thermal expansion of the rubber gaskets without compromising the seal. A report by Johnson & Associates (2020) highlights that polyurethane maintains 60% flexibility after exposure to extreme temperatures, preventing cracking and wear.
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Resistance to Environmental Factors: Resistance to environmental factors includes the ability to withstand ultraviolet (UV) light, moisture, and temperature fluctuations. Polyurethane sealants are designed to endure harsh weather conditions without breaking down. Research by Green and Blue (2022) shows that polyurethane sealants exhibit resistance to humidity and are effective against mold and mildew growth, extending the life of the rubber gasket.
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Longevity: Longevity indicates the durability and lifespan of polyurethane sealants compared to other types. Polyurethane sealants can last for many years without significant degradation. According to the Adhesives and Sealants Council (ASC, 2023), polyurethane sealants have an average lifespan of 10 to 20 years, making them a cost-effective choice for applications requiring long-term seals. This durability results from their chemical composition, which resists degradation from environmental stresses.
These properties make polyurethane sealants a valuable option for ensuring the reliability and effectiveness of rubber gaskets in various applications.
What Key Factors Should Be Considered When Choosing a Sealant for Rubber Gaskets?
Choosing the right sealant for rubber gaskets requires consideration of several key factors.
- Compatibility with Rubber Material
- Temperature Resistance
- Pressure Resistance
- Chemical Resistance
- Curing Time
- Application Method
- Environmental Conditions
Understanding these factors can provide a broader perspective on selecting the appropriate sealant for rubber gaskets.
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Compatibility with Rubber Material:
Choosing a sealant that is compatible with the specific type of rubber in the gasket is essential. Compatibility ensures that the sealant will adhere well without damaging the rubber. For example, silicone sealants are often compatible with various rubbers, while others like some polyurethane sealants may degrade certain types of rubber. A study by Kumar et al. (2019) highlighted the importance of chemical compatibility, revealing that incompatible sealants can lead to premature gasket failure. -
Temperature Resistance:
Temperature resistance refers to the sealant’s ability to withstand varying heat conditions. High-temperature sealants are crucial for applications in engines or industrial environments. For instance, silicone sealants can typically withstand temperatures up to 500°F (260°C), while others may only endure around 200°F (93°C). According to ASTM standards, knowing the operating temperature range is vital for long-lasting seal integrity. -
Pressure Resistance:
Pressure resistance evaluates how well a sealant can perform under physical pressure from fluids or gases. High-pressure applications, such as hydraulic systems, require specialized sealants designed to maintain their integrity under stress. Research conducted by the Society of Petroleum Engineers in 2020 emphasized the criticality of using sealants with high-pressure ratings in oil and gas applications to prevent leaks and failures. -
Chemical Resistance:
Chemical resistance is significant for applications exposed to various substances, including oils, fuels, or solvents. A good sealant must resist degradation from these chemicals. For instance, fluorosilicone sealants are often used in environments where fuel exposure is a concern. A 2018 study by Lee et al. concluded that selecting the right sealant based on chemical exposure reduces failure rates significantly. -
Curing Time:
Curing time refers to the duration required for the sealant to fully set and reach its optimal strength. Different applications may require quick-drying sealants, while others permit longer curing times. For example, RTV (room temperature vulcanizing) silicone may take 24 hours to cure fully, while some epoxy sealants can set in as little as 15 minutes. Understanding the operational timeline of the project is vital for effective planning. -
Application Method:
Application methods vary based on the sealant type and product. Some sealants come in tubes suitable for caulking guns, while others may require brushing or spraying. For instance, pumpable sealants are ideal for large or complex surfaces. The choice of method can influence the ease of application and overall seal quality. -
Environmental Conditions:
Environmental conditions include factors like humidity, temperature fluctuations, and exposure to UV light. Sealants must be chosen based on their ability to withstand these conditions. For example, certain outdoor applications may necessitate UV-resistant sealants to prevent degradation. A 2017 study by the American Society for Testing and Materials emphasized the importance of environmental stability for longevity in outdoor applications.
By examining these factors, one can make an informed and effective choice when selecting a sealant for rubber gaskets.
How Should Sealants Be Properly Applied on Rubber Gaskets?
Sealants should be properly applied to rubber gaskets using a systematic approach to ensure a secure and effective seal. Generally, this involves cleaning the surface, applying an appropriate sealant, and allowing adequate curing time. A well-applied sealant can improve the longevity of gaskets and prevent leaks.
The first step is cleaning the gasket surfaces. Remove dirt, grease, and old sealant with a suitable solvent. Surfaces should be dry before application. According to studies, improper surface preparation can reduce sealant effectiveness by up to 50%, leading to premature failures.
Next, select the right type of sealant. Common choices include silicone, polyurethane, and anaerobic sealants. Silicone sealants are flexible and work well for general applications. Polyurethane offers strong adhesion and durability, making it suitable for high-stress environments. Anaerobic sealants cure in the absence of air, creating strong bonds for metal gaskets.
Application is crucial. Most sealants should be applied in a continuous bead along the gasket’s mating surface. The bead should be approximately 1/8 inch thick, ensuring full contact without excessive overflow. For example, when sealing an oil pan, an even application prevents leaks from developing due to uneven pressure.
Curing time varies by sealant type. Silicone sealants typically cure in 24 hours, while polyurethane can take several days, depending on temperature and humidity. It is essential to adhere to the manufacturer’s guidelines for optimal performance.
Additional factors include operating conditions and material compatibility. High temperatures or extreme pressure can affect sealant performance. For instance, a sealant that works well at moderate temperatures may fail when exposed to high heat. It is important to review the sealant’s specifications to ensure suitability for the intended application.
When applying sealants to rubber gaskets, keep in mind that environmental factors such as humidity, temperature, and surface cleanliness significantly influence adhesion and curing time. Variations in these conditions may lead to different outcomes, thus thorough planning is vital.
Proper application of sealants can ensure long-lasting, leak-proof connections in various applications. Consider exploring various sealant products to find the best match for specific environments and conditions.
What Common Mistakes Should Be Avoided When Sealing Rubber Gaskets?
The common mistakes to avoid when sealing rubber gaskets include improper surface preparation, using the wrong sealant, over-tightening, and ignoring environmental conditions.
- Improper Surface Preparation
- Using the Wrong Sealant
- Over-tightening
- Ignoring Environmental Conditions
Improper Surface Preparation: Improper surface preparation occurs when the sealing surfaces are not cleaned and dried adequately before application. Contaminants like oil, dust, or moisture can inhibit proper adhesion. A clean, dry surface ensures a secure bond between the gasket and the host material. According to a 2018 study by Jensen and Ellis, 70% of sealing failures stem from inadequate surface preparation. This emphasizes the significance of taking the time to prepare surfaces effectively.
Using the Wrong Sealant: Using the wrong sealant means selecting a sealant that is incompatible with the rubber material or application requirements. Different sealants have different chemical properties and temperature tolerances. For example, silicone-based sealants work well with rubber gaskets but may fail under extreme temperatures. The American Society for Testing and Materials (ASTM) provides guidelines for sealant selection, ensuring compatibility and adequate performance for specific applications.
Over-tightening: Over-tightening occurs when excessive force is applied to the gasket during installation, leading to deformation or damage. This mistake can lead to leaks and reduced sealing effectiveness. A 2019 study by Thompson noted that torque specifications in gasket applications must be followed closely, as too much pressure can compress the rubber excessively and cause it to lose its sealing properties.
Ignoring Environmental Conditions: Ignoring environmental conditions refers to the failure to consider factors like temperature fluctuations, exposure to chemicals, and humidity when sealing rubber gaskets. These factors can affect the material’s performance and longevity. For instance, exposure to high temperatures can cause rubber to degrade quickly, while chemicals can break down the material. According to the Rubber Manufacturers Association, understanding these conditions can prolong gasket life and maintain effective sealing, reducing the likelihood of future issues.
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