IS 1070 specifies three grades of reagent water for laboratory use. Type I is ultra-pure for critical analytical work, Type II for routine testing, and Type III for general lab use. Referenced by virtually all IS testing standards that require water as a reagent.
Specification for water used as a reagent in chemical testing and laboratory analysis, covering grades based on purity (Type I, II, III) and quality requirements.
Key Values
Type I conductivity max0.1 µS/cm
Type II conductivity max1.0 µS/cm
Type III conductivity max5.0 µS/cm
Practical Notes
! Type II is sufficient for most construction material testing (concrete, soil, steel chemistry).
! Always check which type of water the specific IS test method requires — using wrong grade can invalidate results.
! Store reagent water in sealed containers — atmospheric CO2 absorption degrades quality within hours.
! Regular calibration of conductivity meters is essential for verifying water quality.