IS 2185 Part 3:1984 specifies requirements for Autoclaved Cellular (Aerated) Concrete (AAC) Blocks used in building construction. The standard covers materials, dimensions, surface texture, block density, compressive strength, thermal conductivity and drying shrinkage. AAC blocks are classified into Grade 1 and Grade 2 based on their performance requirements. Certko provides testing support to help manufacturers and suppliers verify AAC block compliance with applicable BIS requirements and quality parameters.
Chemical Testing
Concrete Masonry Units Part 3 Autoclaved Cellular Aerated Concrete Blocks — IS 2185: Part 3 (1984) Testing
IS 2185: Part 3 (1984) is a BIS product testing standard for cement & construction materials (1 notified product). Book laboratory testing required for ISI Mark / CRS certification.
IS (Indian Standards) — typically accepted in India. Bureau of Indian Standards test methods — primary evidence for BIS / India market compliance and many domestic buyer specs.
- Product category
- Cement & Construction Materials
- Main standard
- IS 2185: Part 3 (1984)
- Test type
- Chemical / composition
- Accreditation
- ISO/IEC 17025 / NABL (BIS-recognised labs)
- Testing timeline
- 7–12 working days
- Sample size required
- 100–500 g representative sample (or as per IS)
- Tentative testing price
- ₹10K – ₹38K
Indicative BIS lab charges from product records — confirm with the laboratory.

BIS products tested to this standard
1 BIS-notified product map to IS 2185: Part 3 (1984) — open a product for scheme, labs and indicative costs.
FAQs about Concrete Masonry Units Part 3 Autoclaved Cellular Aerated Concrete Blocks — IS 2185: Part 3 (1984) Testing
Q1. What is AAC block testing as per IS 2185 Part 3:1984?
AAC block testing as per IS 2185 Part 3:1984 verifies important properties required for autoclaved cellular concrete blocks. The evaluation can include dimensions, density, compressive strength, thermal conductivity, drying shrinkage, moisture content, shape, surface finish and other specified requirements.
Q2. What is the compressive strength test for AAC blocks?
The compressive strength test determines the load-bearing capacity of AAC blocks by measuring their resistance to crushing under a specified test procedure. This result is used to assess whether the blocks meet the strength requirements applicable to their specified grade under IS 2185 Part 3:1984.
Q3. What is the density test for AAC blocks?
The density test measures the mass per unit volume of an AAC block. It is an important quality parameter because the density of AAC blocks is closely related to properties such as weight, thermal performance and strength. Testing helps confirm conformity with the requirements of IS 2185 Part 3:1984.
Q4. How is thermal conductivity of AAC blocks tested?
Thermal conductivity testing evaluates the ability of an AAC block material to conduct heat. The property is important for assessing the thermal insulation performance of blocks used in buildings and can help verify compliance with the applicable requirements of IS 2185 Part 3:1984.
Q5. What is drying shrinkage in AAC blocks?
Drying shrinkage measures the dimensional reduction that can occur in AAC blocks as moisture is lost under specified conditions. Controlling shrinkage is important for reducing the risk of dimensional changes and related problems in construction. Testing is performed according to the requirements of the applicable standard.
Q6. Are AAC blocks covered under IS 2185 Part 3?
Yes. IS 2185 Part 3:1984 specifically covers autoclaved cellular (aerated) concrete blocks used for building construction. The standard lays down requirements relating to materials, physical properties, dimensions, performance characteristics and other quality requirements.
Q7. What parameters are tested for AAC blocks?
AAC blocks can be evaluated for parameters including dimensions, block density, compressive strength, thermal conductivity and drying shrinkage. Depending on the testing scope, properties such as moisture content, surface texture, shape, finish and marking may also be examined.
Q8. Where can I get AAC block testing as per IS 2185 Part 3?
Manufacturers, suppliers and other businesses requiring AAC block testing can approach a competent testing laboratory offering the relevant BIS standard test methods. Certko can assist customers in arranging testing for applicable AAC block quality and performance parameters as per IS 2185 Part 3:1984.
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