Concrete Hollow Blocks: The Ultimate Guide to Sizes, Prices, and Production

Concrete hollow blocks offer a cost-effective, durable, and versatile construction material that has become increasingly popular in recent years. Thanks to their lightweight design and uniform properties, concrete hollow blocks are an ideal choice for residential, commercial, and industrial building projects. They boast high compressive strength, durability, and are an eco-friendly solution, owing to their insulating properties. With various sizes and types, like stretcher, corner, partition, pilaster, and jamb blocks, concrete hollow blocks can cater to diverse construction needs.
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    Concrete hollow blocks have become a popular choice in the construction industry due to their versatility, cost-effectiveness, and lightweight yet durable properties. These blocks offer a high-quality building material with uniform size and shape, making them an ideal solution for various construction projects.

    The use of concrete hollow blocks not only provides a stable and robust structure but also promotes energy efficiency and environmental friendliness. With this ultimate guide, you will gain valuable insights into the benefits, applications, and best practices when working with concrete hollow blocks for your construction projects.

    In earthquake-prone areas, concrete hollow blocks serve as a safer and more cost-effective alternative to traditional wall systems. They offer high strength while minimizing the overall weight of the structure, reducing the risk of damage during seismic events. Read on to learn more about the various aspects and advantages of using concrete hollow blocks in your construction projects.

    Properties of Concrete Hollow Blocks


    Concrete hollow blocks are known for their compressive strength, which is an essential factor in load-bearing capacity. The strength of these blocks is determined by the grade: Grade A blocks have a minimum compressive strength of 3.5 to 15.0 N/mm2, while Grade B blocks have a minimum strength of 3.5 to 5.0 N/mm2 (source).


    One of the main features of concrete hollow blocks is their lightweight property. This characteristic can help reduce the overall weight of a building structure, thus making it more cost-effective and easier to handle during construction. The blocks come in different grades based on their density: Grade A blocks have a density of 1500 kg/m3, whereas Grade B blocks have a density ranging from 1100 kg/m3 to 1500 kg/m3 (source).


    Concrete hollow blocks are praised for their durability, which contributes to their longevity and low maintenance requirements. These blocks have several properties such as fire prevention, sound insulation, heat preservation, and impermeability, which make them suitable for various construction applications (source).

    Furthermore, concrete hollow blocks possess earthquake resistance properties, ensuring that building structures made from these blocks can withstand seismic activities better than those made from traditional materials. This gives them an edge in terms of safety and overall structural integrity (source).

    Section 3: Manufacturing Process

    Raw Materials

    The main ingredients for concrete hollow blocks are powdered Portland cement, water, sand, and gravel. The mixture creates a light gray block with a fine surface texture and high compressive strength.


    Block machines produce concrete hollow blocks in various sizes, such as 4-inch, 5-inch, 6-inch, and 8-inch blocks. By using different mold options, block machines can make blocks of different dimensions. A relatively dry mixture of cement, aggregate, and water is consolidated in a block press machine under high pressure. Once compressed, the mold is taken out and prepared for the curing process.


    After molding, the blocks are left to harden and dry. This process is essential for the blocks to achieve their full strength and durability. The length of the curing process depends on environmental factors, such as temperature and humidity. Generally, the blocks are ready for use after a few days.

    Types and Sizes of Concrete Hollow Blocks

    Concrete hollow blocks are widely used in construction due to their strength, versatility, and affordability. There are various types and sizes of concrete hollow blocks to cater to different needs and preferences.

    Hollow concrete blocks come in a variety of sizes, such as 100 mm x 200 mm x 400 mm, 150 mm x 200 mm x 400 mm, and 200 mm x 200 mm x 400 mm. These dimensions are standard, but custom sizes can also be made depending on the specific requirements of a project.

    Typically, hollow blocks are available in different colors to blend with different design themes. The most common colors include gray, tan, and dark red.

    In addition to size variations, there are several types of concrete hollow blocks available:

    • Stretcher Block: This is the standard type of hollow block used for constructing walls. It has smooth, flat surfaces on all sides for easy stacking and bonding.
    • Corner Block: These blocks are designed with one corner rounded or angled, making them ideal for creating corners in wall constructions.
    • Partition Block: These hollow blocks have thinner walls, which makes them suitable for dividing spaces within a structure.
    • Pilaster Block: These blocks are used to strengthen a wall at specific intervals or to provide a vertical support.
    • Jamb Block: This type of block is designed for constructing window and door jambs, with a space in the center of the block for reinforcement or insulation.

    When choosing the right type and size of concrete hollow block, it is essential to consider factors such as the structural requirements, design aesthetics, and local building codes. By understanding the different types and sizes of concrete hollow blocks available, construction projects can achieve both durability and aesthetic appeal.

    Section 5: Advantages and Disadvantages


    Concrete hollow blocks have several advantages which make them a popular choice for construction projects. One of the main benefits is their high durability. These blocks are made by compacting concrete with high pressure and vibration, resulting in strong and load-bearing capacity.

    Another advantage is the cost-effectiveness of hollow blocks compared to traditional wall systems. They often require less maintenance due to their resistance to sound, heat, and fire. This makes them not only more affordable upfront but also in the long run.

    The insulating properties of concrete hollow blocks contribute to a more eco-sustainable construction environment. This means they can help reduce energy bills, creating a more energy-efficient building.


    Despite many advantages, concrete hollow blocks also have some drawbacks to consider. One of the main disadvantages is their limited sizes and dimensions. The usual size is 390mm x 90mm x 190mm; however, other sizes can be customized based on customer needs.

    Another disadvantage is the requirement of minimum outer wall thickness and hole intervals, which can affect the block’s overall hollowness. These technical specifications must be met to ensure the structural integrity of the blocks.

    Lastly, although concrete hollow blocks are more cost-effective than other traditional wall systems, they may still be more expensive than other alternative building materials such as wood, bricks, or stones. This could be a potential drawback for budget-conscious builders and homeowners.

    Section 6: Applications in Construction

    Concrete hollow blocks play a vital role in various construction projects due to their versatility, durability, and cost-effectiveness. This section will explore the applications of these blocks in residential, commercial, and industrial settings.


    As a lightweight and sturdy construction material, concrete hollow blocks are commonly used in residential construction. They are ideal for constructing walls, floors, and roofs in homes, particularly in earthquake-prone areas. Their uniform size and shape ensure high-quality wall systems that can withstand external forces while providing excellent insulation and soundproofing.


    In commercial projects, concrete hollow blocks serve as both structural frames and base systems for veneer applications. Their fireproof and virtually soundproof qualities make them ideal for constructing office buildings, hotels, and retail spaces. They also provide energy-efficient solutions, as highlighted by Architizer, thanks to their ability to mitigate energy usage and manipulate light and shadow for a visually appealing exterior façade.


    Industrial construction projects also benefit from the use of concrete hollow blocks. They offer strength and durability required for warehouses, factories, and utility buildings. As a cost-effective building material, these blocks help reduce expenses in industrial construction while maintaining high-performance standards. Their dimensions and uniformity enable effective moisture-proof measures, such as plastering with cement mortar, in humid environments.

    Quality Control and Testing Standards

    Quality control is crucial for producing consistent and strong concrete hollow blocks. Manufacturers follow certain methods and techniques to ensure the blocks meet specific standards. This section will discuss the importance of quality control and testing standards for concrete hollow blocks.

    During the production of concrete hollow blocks, it is essential to monitor the mixture of materials and the manufacturing process. This helps maintain the performance and durability of the blocks. One way to ensure quality control is through upwardly open hollow mold technique which ensures uniform wall formation for each block.

    Testing the concrete blocks is another vital aspect of quality control. The blocks must be tested for weight, dimensions, and compressive strength to ensure they meet the desired specifications. The standard size for hollow concrete blocks is 400 x 200 x 200 mm, and they should weigh between 17 and 26 kg (1063 to 1625 kg/m3).

    Grading is also essential when selecting the sand used in the production of hollow concrete blocks. The grading for sand must be strictly adhered to, as it directly affects the quality of the blocks.

    When it comes to compressive strength, different grades of concrete blocks are available. Grade ‘A’ blocks are load-bearing units with a minimum block density of 1500 kg/m3, and their compressive strengths range from 3.5 to 7.0 N/mm2. On the other hand, the National Standard requires that each individual unit (block) should have a compressive strength of at least 5.5 Megapascals (MPa) or 798 PSI.

    In summary, maintaining quality control and adhering to testing standards during the production of concrete hollow blocks is crucial for achieving consistent quality and performance. This involves monitoring material mixtures, manufacturing process, weight, dimensions, and compressive strength to ensure that the blocks meet the required specifications.

    Environment and Sustainability

    Concrete hollow blocks are an environmentally-friendly and sustainable choice for modern construction due to their unique properties and benefits.

    Recycled Materials

    One of the reasons concrete hollow blocks are eco-friendly is that they can be made from recycled materials, such as fly ash, slag, and other industrial waste products. By utilizing these materials, the production of concrete hollow blocks helps reduce waste, conserve natural resources, and lessen the overall environmental impact of the construction industry.

    Energy Efficiency

    Concrete hollow blocks are energy efficient as they provide excellent insulation properties. Their sound and heat insulation capabilities make them suitable for building structures that promote energy conservation. This also contributes to reducing heating and cooling costs in buildings, leading to lower energy consumption and associated carbon emissions over time.

    The unique design of these blocks, with their hollow interiors, helps to maintain a stable temperature inside buildings. As a result, occupants can enjoy a comfortable living environment with lesser external influences, thereby contributing to energy savings and emission reductions.

    In summary, concrete hollow blocks are a sustainable building material that contributes to the preservation of the environment through the use of recycled materials and improved energy efficiency in structures built with these blocks.


    In summary, concrete hollow blocks are a versatile and efficient building material. They offer numerous benefits, such as improved insulation, reduced weight, and cost savings. By understanding the various properties of hollow blocks, builders can make the right choice for their construction projects.

    Different sizes, materials, and mix proportions can affect the performance of concrete hollow blocks. It is essential to consider these factors when selecting the right type of block for your specific needs. Additionally, utilizing wastes like fly ash as a cement substitution can further enhance the blocks’ properties.

    Remember to follow proper guidelines and standards to ensure a strong and durable structure built with hollow concrete blocks. By strategically using these blocks in construction, you can achieve better outcomes in building projects. So, when planning your next construction project, concrete hollow blocks can be a valuable and efficient option to consider.

    Lontto Concrete Hollow Blocks Machine

    Concrete hollow blocks are a popular construction material due to their large output, high efficiency, and potential to save manpower and raw materials. One manufacturer producing high-quality concrete hollow block machines is Lontto.

    Lontto offers a range of block making machines, including automatic and semi-automatic models, to meet various production needs. These machines are durable, efficient, and user-friendly, making them suitable for both small businesses and large-scale operations.

    Some key features of Lontto concrete hollow block machines include:

    • Various capacities and production outputs
    • Adaptable to different molds for producing solid blocks and paver bricks
    • Environmentally friendly, with minimal waste during production
    • Easy operation and maintenance

    One example of a Lontto machine is the LMT4-40 manual (electric) type, which is perfect for small businesses. This particular model can produce hollow blocks, solid blocks, and paver bricks efficiently and quickly.

    When investing in a Lontto concrete hollow block machine, it’s essential to consider factors such as production capacity, available space, and budget. By selecting a suitable machine, businesses can optimize their concrete hollow block production and increase profits in the long term.


    Concrete hollow blocks are a popular building material due to their durability, strength, and versatility. These blocks are made from a mixture of cement, sand, and gravel, with variations in their composition depending on the desired outcome. There are different types of hollow blocks, such as lightweight, medium-duty, and heavyweight blocks, each suited for specific applications.

    When laying concrete hollow blocks, it is important to use a mortar mix to bond the blocks together and ensure the wall’s stability. Proper alignment and leveling of the blocks are essential to achieve a strong and long-lasting structure. Additionally, it is advisable to double-paint the block wall for added protection and apply effective moisture-proof measures like plastering with cement mortar, particularly in humid environments.

    In summary, concrete hollow blocks offer a reliable, strong, and cost-effective solution for various construction projects. By following proper guidelines and utilizing the right type of block for the specific application, these blocks can help create durable and sustainable structures for years to come.

    Zhang Chao from Lontto Group

    Zhang Chao from Lontto Group

    I've been in the building materials industry for 15 years, focusing on brick machines and clay production. My experience in the field and passion for the work have been crucial to my career success. I strive to provide top-quality products and services to my customers and continuously seek to innovate in this field.


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