IS 16993:2018 specifies the chemical and physical requirements for Microfine Ordinary Portland Cement and also covers Microfine Sulphate Resisting Portland Cement. These cements are designed for specialized uses such as rock grouting, concrete structure grouting, underground leak prevention, and soil stabilization. Testing includes particle size, fineness, setting time, bleeding, loss on ignition, and insoluble residue. Certko provides testing and compliance support to help manufacturers verify conformity with BIS requirements.
Chemical Testing
Microfine Ordinary Portland Cement — Specification — IS 16993 (2018) Testing
IS 16993 (2018) is a BIS product testing standard for cement & construction materials (1 notified product). Book laboratory testing required for ISI Mark / CRS certification.
IS · India
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 16993 (2018)
- 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
- ₹51K
Indicative BIS lab charges from product records — confirm with the laboratory.
BIS products tested to this standard
1 BIS-notified product map to IS 16993 (2018) — open a product for scheme, labs and indicative costs.
FAQs about Microfine Ordinary Portland Cement — Specification — IS 16993 (2018) Testing
Q1. What are the main physical requirements of IS 16993:2018?
IS 16993:2018 specifies key physical requirements including minimum fineness of 2000 m²/kg by BET method, particle sizes of maximum 10 µm for D50 and 20 µm for D95, setting time, bleeding and compressive strength.
Q2. What is the minimum fineness required for Microfine Ordinary Portland Cement?
The minimum fineness specified under IS 16993:2018 is 2000 m²/kg, determined using the BET method based on nitrogen adsorption. This fine particle structure supports the specialized performance expected from microfine cement.
Q3. What compressive strength is required under IS 16993:2018?
Microfine cement must achieve a minimum compressive strength of 16 MPa at 3 days, 22 MPa at 7 days and 33 MPa at 28 days. The standard also requires progressive strength development at the specified ages.
Q4. What are the setting time requirements under IS 16993:2018?
The standard specifies a minimum initial setting time of 1 hour and a maximum final setting time of 20 hours. Testing is carried out according to the method specified in the standard's relevant annex.
Q5. What is the maximum bleeding allowed under IS 16993:2018?
The bleeding of Microfine Ordinary Portland Cement, measured at 3 hours from the time of mixing, must not exceed 5 percent as specified by IS 16993:2018.
Q6. Which method is used to determine particle size under IS 16993?
Particle-size distribution is determined using a laser diffraction PSD analyzer. IS 16993:2018 specifies maximum values of 10 µm for D50 and 20 µm for D95.
Q7. What sample quantity is required for IS 16993 testing?
According to the BIS product manual, the specified sample size is 9 kg for physical testing and 1 kg for chemical testing. These requirements are used for certification and conformity assessment under the standard.
Q8. Does IS 16993:2018 cover sulphate resisting cement?
Yes. IS 16993:2018 also covers Microfine Sulphate Resisting Portland Cement. BIS certification scope can include Microfine Ordinary Portland Cement and/or Microfine Sulphate Resisting Portland Cement according to the standard.
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