HASS AAC Autoclaved aerated concrete is a non-fired, environmentally friendly and lightweight building material. Chemical reactions during production create millions of air pores. The product is cured in an autoclave at high temperature and pressure for 12 hours. It is an advanced building material that has been used worldwide for nearly 100 years.

Customer focus: Customer satisfaction is paramount to us. We prioritize open communication and prompt, transparent responses to meet customer needs and build long-term partnerships based on trust and mutual respect.

Quality products: We are committed to manufacturing high-quality AAC blocks and ALC panels that meet stringent quality standards and provide durability and reliability in construction projects.

Expertise and experience: With many years of experience in building materials and hundreds of projects supplied in Vietnam and abroad, our specialists have in-depth knowledge of AAC and ALC products and support customers from design through construction.

Production uses only 1/3 of the raw materials required for fired clay brick.

HASS product lines include AAC blocks, wall panels, floor panels and specialized mortars.

Technical and general product information is available on our website hass.vn . For direct consultation, customers may visit a distributor or call Customer Care at (+848) 22534535 – 22534536, hotline 0931532456, or email htkd@hass.vn.

The main benefits of HASS products include fire resistance, durability, thermal insulation, sound insulation, insect resistance, consistent dimensions, fast and easy installation, light weight, non-toxicity and environmental friendliness.

Autoclaved aerated concrete provides excellent sound insulation and helps maintain quiet between rooms in an apartment. Its strongest benefits are sound and thermal insulation, whose full value is most apparent when the panels are used for external envelope walls.

Yes. Many developed countries stopped using fired clay brick long ago and use autoclaved aerated concrete for thermal insulation and load reduction, particularly in places such as Taiwan and Japan where earthquake resistance is important.

When autoclaved aerated concrete is used for high-rise walls, lighter walls generate lower inertial forces during seismic movement. In addition to being lightweight, the material can absorb impact energy from vibration, helping reduce earthquake damage.

Autoclaved aerated concrete provides excellent sound insulation and helps maintain quiet between rooms in an apartment. Its strongest benefits are sound and thermal insulation, whose full value is most apparent when the panels are used for external envelope walls.

HASS products can be used for external walls, partitions, floors and roofs in high-rise, industrial, residential, commercial and public buildings.

Using HASS blocks can reduce total building load by approximately 15%, save 12-20% in foundation structures and reduce steel quantities in the main frame and columns by 15-20%. Wall construction time can be shortened by up to 30%. Other benefits include energy savings, noise reduction, fire resistance, reduced losses and high durability.

[Block comparison table

](https://hass.vn/documents/sosanhaac.pdf)

This is reinforced autoclaved aerated concrete. It is not as hard and brittle as conventional brick, but is ductile, resilient and lightweight, with sound and thermal insulation up to 7 times better. Its price can be 3 times that of fired clay brick, but it reduces auxiliary materials and plastering labour. The thermal performance of HASS wall panels provides lasting value in use.

No. In addition to being lightweight, HASS wall panels contain internal steel reinforcement and provide ductility and resilience, giving buildings made with HASS a service life of up to 100 years.

Installing 1 layer of HASS blocks or HASS wall panels on the roof provides highly effective heat insulation.

The opposite is true. Autoclaved aerated concrete is extremely lightweight and can even float on water, so it can significantly reduce foundation costs while maintaining structural stability.

HASS has higher water absorption than conventional brick; however, water absorption and resistance to water penetration are different properties. Water is absorbed at the HASS surface but has difficulty penetrating through its distinctive cellular structure. Under normal warm ambient conditions, the water evaporates quickly and the HASS surface returns to its original condition.

In practice, water commonly penetrates mortar joints even in conventional masonry. HASS blocks, particularly large HASS wall panels, have fewer joints than conventional brick, so the joints must be treated correctly. Skimcoat, paint, finishes and waterproofing layers provide additional protection for the HASS wall.

For HASS ALC wall panels, apply skimcoat and an exterior-grade coating. Dedicated waterproofing treatment is required for roof slabs.

Yes, but without skimcoat the surface will not be flat and the joints will remain visible.

The average weight is 85kg/m2.

For an adjoining wall, waterproofing can be applied to the back face of the panel before installation.

During 2010-2013, when AAC blocks were newly produced in Vietnam, incorrect installation methods left voids in joints and made cracking more likely. Both specialized and conventional mortar can be used where appropriate; cracking in these cases resulted from incorrect construction methods.

Autoclaved aerated concrete is easy to cut, so concealed electrical and plumbing services are straightforward to install.

HASS blocks are available in 3 strength grades: B3, B4 and B6.

Specifically:

• B6 blocks have compressive strength >7.5 MPa, comparable to conventional fired clay brick, and a test-condition bulk density of 750 Kg/m3, which is 40-50% lighter than conventional fired clay brick.

• B4 blocks have compressive strength >5.0 MPa, 17-30% lower than conventional fired clay brick, and a test-condition bulk density of 600 Kg/m3, which is 50-60% lighter.

• B3 blocks have compressive strength >3.5 MPa, 40-50% lower than conventional fired clay brick, and a test-condition bulk density of 500 Kg/m3, which is 60-70% lighter.

HASS wall panels include steel reinforcement to increase load resistance.

When designing a house or building, engineers calculate load-bearing columns and beams while the walls form the enclosure. HASS blocks specifically, and AAC generally, comply with TCVN7959 requirements for masonry wall strength.

Yes. Objects can be fixed to the wall and service pipes and finishes can be installed easily. Use screws and anchors specifically designed for AAC.

• HASS blockwork and wall-panel installation are straightforward, so available local labour can be used.

• On request, the company's construction technical team will provide detailed guidance to the site crew.

• Many crews experienced in HASS block and wall-panel installation are available in the market.

We can introduce companies experienced in the design and installation of HASS AAC. Please contact Customer Care at (+848) 22534535 – 22534536, hotline +84906741560, or email cskh@hass.vn.

Installation documents and videos are available on our website. Our training team is also ready to provide site guidance. Please contact Customer Care at (+848) 22534535 – 22534536, hotline +84906741560, or email cskh@hass.vn.

Dust masks and eye protection must be worn when cutting HASS. Gloves and long sleeves are also recommended for people with sensitive skin.

The twin steel frames inside each ALC panel use structural steel that is stiffer than ordinary reinforcing steel and are welded into a box configuration to increase bending resistance. HASS panel production strictly follows a German process: rust is removed from the steel frame, the frame is dip-coated, the coating is dried, and the frame is then placed in the panel mould. The coating withstands temperatures above 500 degrees C and contains additives that bond with the autoclaved aerated concrete. The frame is therefore durable, thermally protected, corrosion resistant and firmly bonded to the surrounding concrete.

The rough construction cost, including HASS wall-panel material and installation, ranges from 550,000-700,000 VND/m2 depending on quantity, location and project complexity.

The initial cost is slightly higher than fired clay brickwork. However, a HASS wall provides substantially better sound insulation, thermal insulation, fire resistance and durability than a fired clay brick wall of the same thickness. Because it weighs only 1/3 as much as fired clay brickwork, construction time is also much shorter. Its thermal insulation can reduce air-conditioning electricity costs by more than 40% (a 100mm HASS wall provides thermal insulation comparable to a 700mm conventional fired clay brick wall), making the total cost more economical after 1-2 years.

No. In addition to being lightweight, HASS wall panels contain steel reinforcement and provide ductility and resilience, giving HASS buildings a service life of up to 100 years. 1 layer of HASS blocks or wall panels on the roof provides highly effective heat insulation. Because autoclaved aerated concrete is extremely lightweight and can even float on water, it can significantly reduce foundation costs while maintaining structural stability.

For HASS ALC wall panels, apply skimcoat and an exterior-grade coating; dedicated waterproofing is required for roof slabs. Direct painting is possible, but without skimcoat the surface will not be flat and the joints will remain visible.

The average weight is 85kg/m2. For an adjoining wall, waterproofing can be applied to the back face of the panel before installation.

HASS has achieved the Trusted Green index certification, surveyed by the Asia Pacific Credit Rating Index Center, with quality supervision by NQA (National Quality Assurance) from the United Kingdom and issued by the Vietnam Enterprise Institute. Trusted Green measures evidence of environmentally responsible action, energy saving, occupational health and safety, social responsibility and innovative decisions toward sustainable consumption.

All raw materials and the production process of HASS products are environmentally friendly, and this can be considered in LEED assessment. In practice, LEED evaluates the overall energy and environmental performance of a building project rather than a single material in isolation.

LEED assesses autoclaved aerated concrete products through criteria such as:

– Recycled or reused content, such as AAC blocks containing fly ash or sand reused during production.

– Reduced energy consumption for the building.

– Local product sourcing, where applicable to the project.

– Local raw-material sourcing.

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