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Discover the Essential Guide: When to Seal Slate Tile for Long-Lasting Beauty and Durability

by | Sep 10, 2025 | Slate Tile Articles

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Understanding Slate Tile and Its Porosity

What Is Slate Tile?

Slate tile isn’t just a pretty face—its true charm lies in its natural porosity. Unlike ceramic or porcelain, slate is a metamorphic rock that’s inherently permeable, meaning it loves a good drink of water. This porosity makes it vulnerable to stains, moisture damage, and even mold if left unchecked. So, understanding when to seal slate tile is crucial for preserving its rugged elegance.

Think of slate as a sponge in disguise—without proper sealing, its porous surface can soak up spills like a champ. This isn’t a problem if you’re aware of its nature; however, neglecting to seal it at the right time can lead to long-term damage. Here’s a quick rundown of what makes slate unique:

  • Natural porosity varies depending on the type and finish of the slate.
  • Sealing can enhance color richness and prevent staining.
  • Failure to seal when necessary can result in water infiltration and surface deterioration.

Knowing when to seal slate tile isn’t just about reacting to stains—it’s about proactive maintenance. A well-sealed slate surface resists moisture and keeps its stunning appearance for years to come, proving that sometimes, patience (and sealing) truly pays off.

Why Is Porosity Important?

Slate’s natural porosity is both its greatest charm and its most persistent challenge. This metamorphic rock, revered for its rugged beauty, also functions like a sponge—absorbing moisture and stains if left unprotected. Understanding when to seal slate tile is essential in preserving its integrity and appearance over time. The porosity of slate isn’t uniform; it varies depending on the type, mineral content, and finish, which all influence how much moisture it can absorb. Recognizing these nuances helps homeowners and professionals determine the right moment to act.

Why does porosity matter? In essence, it’s the difference between a resilient, long-lasting surface and one prone to deterioration. Unsealed slate can succumb to water infiltration, leading to surface damage, mold growth, and unsightly stains. It’s not merely about aesthetics—sealing impacts the longevity of the slate itself. When to seal slate tile requires a keen eye and understanding of its natural properties. Typically, sealing should be considered after installation and before any significant exposure to spills or moisture. This proactive approach ensures that slate maintains its timeless allure, resisting the wear and tear of daily life.

Types of Slate and Their Characteristics

Slate tile isn’t just a pretty face—it’s a natural marvel with a personality all its own. Its porosity can be as unpredictable as a weather forecast, varying wildly depending on the type of slate and its mineral makeup. Some slabs are like a sieve, eager to soak up every droplet and stain, while others are more reserved, offering a bit of natural resistance. Understanding when to seal slate tile hinges on recognizing these subtle differences and knowing what to look for.

Slate’s porosity can be broadly categorized into a few types, each with its own quirks. For instance, fine-grained slate tends to be less porous, making it somewhat more forgiving, whereas coarse-grained varieties are like sponges in disguise. The finish applied also plays a vital role—honed or matte finishes often require sealing sooner than polished versions, which have already been sealed in their glossy shell. To navigate this maze, consider these characteristics:

  1. High porosity slate absorbs water quickly, signaling it’s time for sealing.
  2. Low porosity slate resists moisture but still benefits from periodic sealing for added protection.
  3. Natural cleft surfaces are more porous and prone to staining, demanding more frequent sealing.

Knowing your slate’s mineral content and finish helps determine when to seal slate tile, ensuring your investment remains stunning and durable. After all, a little foresight can save you from a stained, damaged surface that looks more like a crime scene than a sleek flooring choice.

Benefits of Sealing Slate Tile

Protection Against Stains and Spills

Sealing slate tile isn’t just about enhancing its natural beauty; it’s a critical step in safeguarding your investment. Slate’s porous surface can absorb liquids and stains, making it vulnerable to spills and discoloration over time. By sealing your slate tiles, you create a formidable barrier that significantly reduces the risk of damage and prolongs their lifespan.

Understanding when to seal slate tile is essential for maintaining its pristine condition. The right timing ensures that the sealant penetrates deeply into the stone, offering maximum protection without trapping moisture. Typically, sealing should be considered after the slate has been thoroughly cleaned and dried—usually within a few days of installation. This proactive approach helps prevent stubborn stains from setting in, especially in high-traffic areas or kitchens where spills are inevitable.

Protection against stains and spills is one of the most compelling reasons to seal slate tile. It keeps your surfaces looking vibrant and new, even after years of wear. For added peace of mind, some homeowners opt for a two-coat sealing process, creating an even more resilient shield against accidental splashes or organic stains like wine or oils. Knowing when to seal slate tile is key to preserving both its aesthetic charm and structural integrity—an investment that pays dividends in durability and beauty over time.

Enhanced Durability and Longevity

Slate’s allure lies in its timeless elegance, yet beneath its natural beauty lurks a vulnerability that demands vigilant care. Sealing slate tile is not merely a precaution; it’s an act of preservation—an invisible armor that sustains its allure against the relentless march of time and use. But understanding when to seal slate tile is where the true mastery begins, for timing can mean the difference between enduring resilience and premature deterioration.

In the delicate dance of maintenance, the moment to seal slate tile hinges on the tile’s readiness—after a thorough cleaning, ensuring it’s completely dry, ideally within a few days of installation. This strategic window allows the sealant to penetrate deeply, forming a protective barrier that resists liquids, stains, and organic messes. When to seal slate tile is a question intertwined with the nuances of its environment and usage; high-traffic areas and kitchens, where spills are inevitable, benefit most from prompt sealing.

Sealing at the right juncture enhances durability and significantly prolongs the lifespan of your slate surface. The benefits extend beyond mere aesthetics—by sealing, you’re fortifying the natural stone against the relentless assault of moisture and dirt. Some experts recommend a double coat to bolster this defense, especially in zones exposed to frequent spills or organic stains like wine and oils. In essence, knowing when to seal slate tile isn’t just about maintenance—it’s a strategic choice that preserves both its structural integrity and visual splendor for decades to come.

Maintaining Aesthetic Appeal

Sealing slate tile isn’t just about protection — it’s about maintaining its stunning visual appeal over time. Without proper sealing, natural stone can lose its vibrancy and become dull, especially in high-traffic areas. Sealed slate retains its rich, earthy tones and distinctive textures, ensuring your surface remains eye-catching for years.

The right timing is crucial. When to seal slate tile depends on its installation environment. Typically, sealing should occur shortly after installation, once the slate is thoroughly cleaned and completely dry. This initial sealant acts as a shield against dirt, spills, and organic stains, preserving the stone’s natural beauty.

For added protection, some experts recommend applying a second coat. This is particularly beneficial in busy kitchens or outdoor spaces where the slate faces constant exposure to moisture and organic messes. Proper sealing, at the right moment, keeps your slate looking pristine and helps it age gracefully, safeguarding both its aesthetic and structural integrity.

Preventing Water Damage and Mold

Slate’s natural porosity makes it a captivating choice for floors and walls, but it also opens the door to water infiltration and mold growth if not properly sealed. When to seal slate tile is a question that holds the key to safeguarding your investment from hidden damage. Without a protective sealant, moisture can seep into the stone, creating an environment where mold spores thrive beneath the surface. This not only compromises the beauty of your slate but also poses health risks.

Sealing slate tile at the right moment acts as a formidable barrier against water damage. It prevents organic stains and organic matter from penetrating deep into the stone’s core. In high humidity or outdoor settings, the risk of moisture-related issues escalates, making timely sealing essential. Applying a quality sealant when the slate is thoroughly cleaned and dry ensures maximum adhesion and effectiveness. For environments with high foot traffic or exposure to the elements, a second coat can provide an extra layer of defense, prolonging the life of your slate surface.

Signs That Slate Tile Needs Sealing

Absorption of Liquids and Stains

Slate tile possesses an enchanting natural beauty, but its charm can quickly fade if it’s left vulnerable to the relentless assault of liquids and stains. Recognizing when to seal slate tile is akin to sensing the subtle shift in seasons—it’s a matter of feeling the signs beneath your fingertips. One of the clearest indicators is the absorption of liquids; if a few drops of water seep in and darken the surface, it’s a telltale sign that sealing is overdue.

Stains that stubbornly cling despite cleaning efforts often whisper the same warning—your slate needs protection. To truly understand when to seal slate tile, observe the surface for dull patches or areas where spills leave lingering marks. These visual cues are your guide, signaling that the porous nature of slate is inviting damage. When these signs appear, it’s time to act—sealing the slate before the damage spreads and diminishes its natural allure.

Loss of Surface Shine or Dullness

Nothing dulls the allure of a beautifully laid slate tile quite like a lack of proper sealing. It’s startling how quickly a surface can lose its natural luster, turning from vibrant to lackluster in the blink of an eye. One of the most telling signs that you should consider when to seal slate tile is a noticeable loss of surface shine. When the once-glossy finish becomes matte or uneven, it’s as if the slate is whispering for help.

Additionally, if you notice areas where the surface appears dull or patchy—especially after cleaning—it’s a subtle but insistent signal. These dull patches often indicate that the porous surface has begun to absorb moisture or stains, which can accelerate damage if ignored. Recognizing these signs is crucial, as they are your window into understanding when to seal slate tile, preserving its natural beauty and ensuring it remains resilient against the elements.

Cracks or Damage in the Slate

In the quiet symphony of your tiled sanctuary, cracks and damage in slate are the silent notes of distress that demand attention. These fissures, often whispering beneath the surface, are more than mere blemishes—they are gateways for moisture, dirt, and decay. Recognizing when to seal slate tile hinges on observing these subtle signs. Cracks, chips, or areas where the slate appears compromised are clear indicators that the protective barrier has waned, and sealing becomes imperative. If ignored, these vulnerabilities can escalate, leading to more extensive deterioration and the loss of natural elegance.

To truly understand the moment when to seal slate tile, look for visible damage—be it a hairline crack or a broader fissure. Often, these imperfections are accompanied by a rougher texture or uneven patches, signaling that the integrity of the slate’s surface is compromised. Addressing these issues early with a proper sealant not only preserves the aesthetic appeal but also fortifies the slate against future harm. Remember, the decision of when to seal slate tile is often marked by the first signs of damage—an essential step in safeguarding its timeless allure.

Changes in Color or Texture

Slate’s natural luster is its soul, a whisper of ancient earth woven into each slab. Yet, as time weathers its surface, subtle shifts in color and texture often serve as silent harbingers—indicators that the moment to seal slate tile has quietly arrived. A faded hue, dulled sheen, or uneven patches tell tales of porosity’s relentless grip, exposing the delicate dance between beauty and vulnerability.

When the slate begins to lose its vibrant depth or develops a matte or roughened surface, it signals that moisture and dirt are encroaching beneath the surface. Recognizing these signs early is crucial; sealing in these moments can restore the slate’s natural elegance while preventing further deterioration. Sometimes, it’s as simple as a gentle tactile inspection — if the texture feels coarser or patches seem less uniform, it’s time to consider sealing. The question of when to seal slate tile hinges on these perceptible shifts, as each subtle change whispers the need for preservation.

Best Time to Seal Slate Tile

After Installation and Initial Setting

The moment to seal slate tile is not dictated solely by the installation process but by the subtle whispers of its natural essence. Slate, with all its mystique, demands patience—an interval where its true character can emerge before cloaking it in protection. Statistically, waiting at least 48 to 72 hours after the initial install can make all the difference, allowing the slate to settle into its new domain and revealing any lingering moisture or imperfections.

Timing is critical—seal too soon, and the porous surface risks trapping moisture, fostering unseen threats like mold or staining. Too late, and the slate becomes vulnerable to stains, spills, and the relentless march of time. A gentle touch and a watchful eye will guide when to seal slate tile, often best after the slate has undergone its initial setting phase and exhibits a stable, dry surface. It’s a delicate dance between patience and prudence—knowing when to seal slate tile ensures its longevity and keeps its dark, alluring sheen intact for years to come.

When Cleaning and Restoring Slate

In the realm of slate restoration, timing is everything—like the precise moment a mystical portal opens, revealing its hidden secrets. When to seal slate tile isn’t merely a matter of routine; it’s an art, a dance of patience and intuition. After the initial installation, allowing the slate to breathe and settle is crucial. Typically, waiting at least 48 to 72 hours after laying the tiles provides the perfect window for sealing, ensuring the surface is dry and free of excess moisture. This pause enables the slate’s natural essence to reveal itself, guiding the expert eye on when to seal slate tile for optimal results.

Sealing too soon can trap moisture beneath the surface, risking long-term damage or unsightly stains. Conversely, delaying the sealing process too much leaves the slate vulnerable to stains, spills, and the relentless wear of time. When the slate’s surface appears stable, dry, and free of residual moisture, it’s time to proceed. This delicate moment—when the slate’s true character is unveiled—ensures the longevity of its dark, alluring sheen and maintains its rustic charm for decades to come.

Before Putting Slate into Heavy Use

In the intricate dance of maintaining slate’s natural mystique, timing is everything—especially when it comes to sealing slate tile before heavy use. Slate, with its alluring depths and textured surface, demands a delicate balance between protection and preservation. The question of when to seal slate tile isn’t merely about applying a protective layer; it’s about understanding the subtle cues that signal the slate’s readiness for safeguarding.

Typically, the optimal window for sealing slate tile occurs after the initial installation and the slate has had adequate time to breathe—usually 48 to 72 hours. During this period, moisture evaporates, and the slate’s true character begins to unveil itself. Sealing too soon can trap residual moisture, risking long-term damage or unsightly stains, while waiting too long leaves the surface exposed to potential hazards like spills and wear. When the slate appears dry, stable, and free of residual dampness, it’s the ideal moment to proceed. This ensures the sealing process enhances the slate’s natural beauty and extends its lifespan, especially before it faces the rigors of heavy foot traffic or daily use.

Understanding when to seal slate tile is a nuanced art—one that combines patience with an eye for subtle signs. By respecting this delicate timing, homeowners and artisans alike can preserve the rustic charm and enduring allure of slate for generations to come. After all, a well-timed seal transforms a stunning natural stone into an enduring masterpiece of resilience and aesthetic grace.

Seasonal Considerations and Climate Factors

The timing for sealing slate tile isn’t just a matter of months or days—it’s deeply intertwined with seasonal shifts and climate nuances that can turn a good decision into a lasting masterpiece. In South Africa’s diverse climate, understanding the subtle dance of temperature and humidity becomes essential. When to seal slate tile depends heavily on these factors, ensuring the sealer bonds perfectly and provides optimal protection.

During humid or rainy seasons, the moisture levels in the environment can prolong the slate’s drying process, delaying the ideal sealing window. Conversely, in the dry, warm months, slate dries faster, making it easier to determine the perfect moment for sealing. A good rule of thumb is to wait until the slate is completely dry—usually after 48 to 72 hours of installation—before applying a sealant. This window allows excess moisture to escape and ensures the slate’s surface is stable.

In regions with extreme seasonal fluctuations, it’s wise to observe the slate closely. If the environment is particularly damp or cold, consider postponing sealing until conditions improve. Conversely, during the peak of summer, when warmth and dryness prevail, sealing can often be performed sooner, provided the slate has had ample time to breathe.

  • Warm, dry days
  • Lower humidity levels
  • Stable temperature conditions

are ideal for sealing slate tile, ensuring the protection is both effective and aesthetically pleasing. Understanding these seasonal considerations allows homeowners and artisans alike to strike the perfect balance, preserving the natural allure of slate for decades to come.

How to Prepare Slate Tile for Sealing

Cleaning and Removing Debris

Preparing slate tile for sealing is a delicate dance, one that requires patience and precision. Before you embark on this journey, it’s essential to ensure the surface is free of debris, dust, and lingering residues that can compromise the sealant’s effectiveness. A thorough cleaning not only revives the natural beauty of the slate but also reveals its true character—cracks, fissures, and subtle variations that tell a story of earth’s artistry.

To properly prepare the slate tile, start with a gentle scrub using a pH-neutral cleaner designed specifically for natural stone. This prevents etching and preserves the surface’s integrity. Once cleaned, allow the slate to dry completely—this step is crucial, as moisture trapped beneath the sealant can cause issues later. For optimal sealing results, consider the following:

  • Inspect for any damage or surface irregularities that might hinder the sealant’s adhesion.
  • Remove any loose debris or dust with a soft brush or vacuum.
  • Address stubborn stains or mineral deposits with a specialized cleaner, if necessary.

Only when the slate is pristine and dry should you proceed to when to seal slate tile. This preparation ensures the sealant penetrates deeply, safeguarding the stone’s timeless beauty for years to come. Remember, the key lies in patience—rushing the cleaning process can diminish the sealant’s ability to protect your investment.

Allowing Proper Drying Time

Timing is everything—especially when it comes to sealing slate tile. Rushing the process can turn your stunning natural stone into a dull, waterlogged mess, so patience is key. Once your slate is thoroughly cleaned and free of debris, the next crucial step is to allow ample drying time. Moisture trapped beneath the sealant can cause unsightly bubbles, mold, or even compromise the integrity of the tile itself. Trust me, nobody wants a glossy finish marred by hidden dampness!

Remember, the moment to seal slate tile isn’t just about the cleaning process; it hinges on when the surface is completely dry. A good rule of thumb is to wait at least 24 to 48 hours after cleaning, especially in humid climates like South Africa’s. This ensures the slate’s pores are fully exposed and ready to absorb the sealant, making your investment last longer. So, when to seal slate tile? Only after you’re confident the surface has dried thoroughly—otherwise, you risk sealing in moisture and watching your beautiful slate lose its luster over time.

Choosing the Right Sealer

Preparing slate tile for sealing is a delicate dance—one that requires patience and precision. Before choosing a sealer, ensure the surface is impeccably clean. Dirt, dust, and residual debris can compromise the adhesion of the sealant, leading to a patchy or uneven finish. A gentle yet thorough cleaning with pH-neutral cleaners helps open the pores of the slate, allowing for optimal absorption of the sealant. Remember, the key to knowing when to seal slate tile hinges on the surface’s dryness. Moisture trapped beneath the sealant can cause bubbling, mold, or damage over time—an outcome no homeowner desires.

Once the slate is spotless, it’s wise to let it dry completely—ideally for 24 to 48 hours, especially in humid climates like South Africa’s. This drying period is crucial because it ensures the slate’s pores are fully exposed and ready to accept the sealant. When selecting the right sealer, consider options that match your slate’s porosity and intended use. For instance, penetrating sealers are ideal for enhancing longevity, while topical sealants provide a glossy aesthetic. To facilitate the process, some professionals recommend preparing by

  • testing the sealer on a small, inconspicuous area
  • reading manufacturer instructions carefully

. This ensures the sealer penetrates evenly, fostering durability and preserving the natural beauty of the slate.”

Performing a Patch Test

Understanding when to seal slate tile is crucial for preserving its natural allure and durability. Before applying any sealer, performing a patch test can be the difference between a flawless finish and a costly mistake. This simple step reveals how your slate responds to different products, preventing unwanted surprises down the line.

Start by selecting an inconspicuous area—perhaps a corner or behind furniture—and apply a small amount of the chosen sealer. Wait 24 hours to observe any changes in color or texture. If the slate appears uneven or develops a hazy film, reconsider your product choice or delay sealing altogether. This cautious approach ensures that the slate’s porosity and surface characteristics are compatible with the selected sealer, which is essential when determining when to seal slate tile.

Frequency of Sealing Slate Tiles

General Recommendations

Knowing when to seal slate tile isn’t just about tossing on a coat of sealant and hoping for the best. It’s a nuanced dance that hinges on a few telltale signs and seasonal cues. Slate, with its enchanting natural hues, can remain unsealed for quite some time—sometimes even years—if left undisturbed in a dry climate. But, alas, neglecting timely sealing often leads to a dull appearance or, worse, stubborn stains that refuse to budge.

For those pondering when to seal slate tile, a key indicator is the surface’s texture. If water no longer beads up and starts to seep in—cue the ominous drip—it’s high time for sealing. Additionally, if you notice a loss of shine or an increase in surface etches, sealing becomes an urgent priority. Think of sealing as a spa treatment for your slate: regular sessions keep it looking pristine and prevent costly repairs down the road. Remember, sealing slate isn’t a one-and-done affair; it’s an ongoing process—like watering a plant, but with far more style.

Factors Influencing Sealing Frequency

The question of when to seal slate tile is a dance with time and touch. Slate, with its whisper of ancient earth, can remain unsealed for years—if kept in a dry, temperate climate—yet even the most resilient slate eventually reveals subtle signs that it’s craving protection. The frequency of sealing slate tiles hinges on several factors, each whispering its own tale of wear and vulnerability.

If water begins to no longer bead up on the surface, but instead seeps into the stone, it’s a clear call that the slate needs sealing again. Similarly, a loss of its natural sheen or the appearance of fine etches signals that moisture and stains are finding their way into the porous surface. In high-traffic areas or spaces prone to spills, sealing should be revisited more often—perhaps every 1 to 2 years—while more stable environments might stretch this interval to 3 or even 5 years.

Understanding these influences can help determine when to seal slate tile effectively, ensuring its enchanting beauty endures. Because, after all, maintaining the allure of slate is an ongoing ritual—like tending a delicate garden where each season demands a different touch.

Expert Tips for Sealing Slate Tile Effectively

Applying Sealant Evenly

Sealing slate tile is an art that balances protection with preservation of natural beauty. Knowing when to seal slate tile can be the difference between a resilient surface and one prone to damage. The optimal time to apply sealant is after the slate has fully dried and cured, usually 48 to 72 hours post-installation. This window allows the stone to settle into its final state, ensuring the sealant adheres effectively and provides long-lasting defense.

Applying sealant evenly is crucial to avoid patchy coverage that can compromise the tile’s appearance and protective qualities. Use a high-quality brush or roller, working in small, manageable sections. For a seamless finish, follow the natural grain of the slate and maintain a consistent pressure. Before sealing, always perform a patch test to prevent unexpected reactions, especially when dealing with porous or textured slate. Remember, the goal is to create a uniform barrier that enhances durability without obscuring the slate’s unique character.

Avoiding Common Mistakes

Sealing slate tile is a delicate dance, a moment where timing can transform a good-looking surface into a resilient masterpiece. If you’ve ever wondered when to seal slate tile, the answer hinges on patience and a keen eye. Typically, the optimal window opens after the slate has fully dried and cured, which usually takes between 48 to 72 hours post-installation. Rushing this process risks sealing in moisture or trapping residues that can mar the natural beauty of the stone.

Expert tips for sealing slate tile effectively often include avoiding common mistakes like uneven application or neglecting a patch test. It’s wise to use a high-quality brush or roller, working systematically in small sections. Remember, the goal isn’t just to protect but also to preserve the aesthetic charm of the slate. Applying sealant too early or too late can compromise its protective qualities, leading to issues like dullness or staining. When in doubt about when to seal slate tile, wait until the surface is thoroughly dry and free of debris—patience truly pays off in this regard!

Maintaining Sealed Slate

Sealing slate tile isn’t just about applying a protective layer; it’s a delicate process that hinges on timing and precision. Knowing when to seal slate tile can mean the difference between a stunning, resilient surface and one prone to damage or dullness. The window for sealing typically opens after the slate has fully dried and cured, which generally takes between 48 to 72 hours post-installation. Rushing this step risks trapping moisture or residues that can mar the natural charm of the stone, diminishing its character and longevity.

Expert tips for sealing slate tile effectively emphasize patience and attention to detail. It’s crucial to wait until the surface is completely dry and free from debris before applying any sealant. A patch test can also help determine the best sealant for your specific slate type, ensuring optimal adhesion and protection. When applying the sealant, use a high-quality brush or roller, working systematically in small sections to achieve an even coating. This method prevents uneven application, which can lead to streaks or missed spots that compromise the slate’s aesthetic and durability.

When to Reapply Sealant

Understanding when to seal slate tile is a nuanced dance that balances patience with precision. Sealing too early can trap moisture beneath the surface, leading to potential damage, while waiting too long might leave the stone vulnerable to staining and wear. The ideal moment to seal slate tile often coincides with the complete drying and curing process, which typically spans between 48 to 72 hours after installation. Rushing this step can compromise the integrity of the sealant, diminishing the natural beauty of the slate and reducing its lifespan.

Expert tips for sealing slate tile emphasize the importance of examining the surface thoroughly before application. Ensuring the slate is entirely dry and free from dust, debris, or residues is paramount. A simple patch test can reveal if the sealant adheres well without altering the stone’s appearance. When you do apply the sealant, use a high-quality applicator—be it brush or roller—and work systematically in small sections to achieve an even, consistent coating. This careful approach not only enhances aesthetics but also extends the period between reapplications, making it a vital consideration in preserving your slate’s resilience over time.

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