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Thick, Thin and Ultra-Thin Fire Resistant Coatings: What's the Difference?

Steel structures are widely used in industrial buildings, warehouses, commercial buildings, bridges and large public facilities due to their high strength, lightweight properties and construction efficiency. However, steel loses strength and stiffness when exposed to high temperatures, which can affect the load-bearing capacity and overall safety of a structure. Fire-resistant coatings provide an important protective solution by slowing down the temperature rise of steel during a fire. But how do these coatings actually work? What are the differences between thick-film, thin-film and ultra-thin fire-resistant coatings? And how should the right coating be selected for different applications? This article explores their working principles, key characteristics and typical applications. 1. How Do Fire-Resistant Coatings Work? The primary function of fire-resistant coatings is to delay the heating of steel structures during a fire, helping maintain their structural integrity for a longer pe...
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Performance Differences in Interior Wall Putty: How to Choose Between Standard and Alkali-Resistant Types

 White deposits, powdering and peeling are common problems encountered during interior wall finishing. Although these issues are sometimes attributed to poor-quality putty, their causes may also include substrate efflorescence, persistent moisture, weak substrate surfaces, unsuitable material compatibility or improper application. The difference between standard interior wall putty and alkali-resistant putty goes beyond product naming. It involves formulation objectives, substrate compatibility, bonding performance, water resistance and application requirements. For putty manufacturers, building material distributors and technical professionals, understanding these differences helps improve product selection, reduce avoidable rework and develop solutions suited to different construction conditions. 1. What Is the Difference Between Standard and Alkali-Resistant Putty? Standard Interior Wall Putty Standard interior wall putty is primarily used to level wall surfaces and prepare them...
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Water Retention in Plastering Mortar: How HPMC Influences Workability and Bond Strength

 1. Why Is Water Retention Critical in Plastering Mortar? Plastering mortar performance depends not only on cement, sand, and other raw materials, but also on its ability to retain water. When applied to substrates such as autoclaved aerated concrete (AAC) blocks, lightweight wall panels, or cast-in-place concrete, the substrate's water absorption characteristics directly influence moisture movement within the mortar. If the substrate absorbs water too quickly, the mortar may lose consistency and workability, while insufficient moisture may interfere with cement hydration. Under unfavorable conditions, these effects can increase the risk of poor interfacial bonding, cracking, and hollow spots. Cellulose ether, particularly hydroxypropyl methylcellulose (HPMC), is an important functional additive for improving water retention and workability in plastering mortar. HPMC increases the viscosity of the aqueous phase and helps retain moisture, slowing water migration and maintaining the ...
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Why Can Concrete Crack Even When It Is Water-Cured Frequently?

 What Really Matters in Hot-Weather Concrete Curing During summer construction, what is one of the biggest concerns for fresh concrete? Many people immediately think: insufficient moisture. So after placing concrete, they keep spraying or watering the surface, assuming that more water means better curing and fewer cracks. But sometimes, the opposite seems to happen: The concrete is watered frequently, yet cracks still appear. So, is the problem really a lack of water? Not necessarily. For concrete exposed to hot-weather conditions, curing needs to address two things together: Moisture control + temperature control. 01 | Why Is Concrete More Prone to Cracking in Summer? High temperatures, strong sunlight, low humidity, and wind can accelerate moisture loss from the concrete surface. At the same time, cement hydration continues to generate heat, which can create a temperature difference between the interior and the surface of the concrete. If the surface cools and contracts significa...
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Not All Air Bubbles in Concrete Are Harmful: Which Ones Should You Really Worry About?

After formwork is removed, air bubbles, bugholes, or small surface voids may appear on concrete. The first question is often: Was the concrete insufficiently vibrated? Not necessarily. Not all air bubbles in concrete are harmful. What really matters is their size, distribution, location, and cause. 01 | Some Air Bubbles Are Actually Beneficial Tiny air bubbles introduced by air-entraining agents are generally small and evenly distributed. In freeze-thaw environments, these bubbles can provide small pressure-relief spaces for ice expansion and help improve the concrete's freeze-thaw resistance. So, fewer air bubbles do not always mean better concrete. Beneficial microbubbles do not need to be completely removed. 02 | Large Air Bubbles Are the Ones That Need Attention Large and concentrated air bubbles may affect concrete compactness and surface appearance. They may be related to: Admixture system and dosage Mixing speed and mixing time Air introduced during mixing Placement and vibr...
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How Thick Should Plastering Mortar Be? Key Thickness Control Tips

 There is no single plaster thickness for every project. The appropriate thickness depends on the substrate, application area, mortar type, construction method and project requirements.​ In practice, three points are important: layer thickness, total thickness and reinforcement when necessary.​ 1. How Thick Should Each Layer Be? Plaster should not be applied in an excessively thick layer at once.​ According to JGJ/T 220-2010, cement plastering mortar is generally applied at 5–7 mm per layer, while cement-lime plastering mortar is generally 7–9 mm per layer.​ When greater thickness is required for leveling, use multiple layers instead of one thick application.​ 2. Typical Total Thickness Common reference values include:​ • Ordinary interior wall plastering: ≤20 mm​ • High-grade interior plastering: ≤25 mm​ • Exterior wall surface: ≤20 mm​ • Exterior plinth and similar areas: ≤25 mm​ • Cast-in-place concrete ceiling: ≤5 mm​ • Precast concrete or panel ceiling: ≤10 mm​ Actual projects...
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Concrete Curing Is Not About Using More Water: The Key Is Controlling Moisture and Temperature

 “Just add more water—the more you water concrete, the better it will cure.” This is a common idea on many construction sites. But in practice, more water does not automatically mean better curing. The real purpose of concrete curing is to maintain suitable moisture and temperature conditions during early-age hardening, allowing cement hydration to continue while reducing the risk of excessive moisture loss, shrinkage, and temperature-related cracking.                                           01 | Why Doesn't More Water Always Mean Better Curing? Fresh concrete has relatively low surface strength during the early stages. If a newly placed surface is exposed to strong water flow, especially when the water temperature is significantly different from the concrete temperature, rapid temperature changes may increase the risk of early-age cracking. Strong water flow may also disturb ...
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