AS PER IS: 2720 (Part V)



  • For determining the Liquid Limit of soils.
  • This is specially useful to obtain reliable and accurate results for those soils which have low plasticity index.
  • The percentage moisture contents determined when cone with half angle of 15-30 minutes under a total sliding weight of 148 ± 0.5 gm penetrates 25 mm gives the Liquid Limit.


General Description and Specifications:

  • It will consist of metallic cone with half angle of 15' -30 ±15' and 30.50 mm coned length.
  • It will be fixed at the end of a metallic rod with a disc at the top of the rod so as to have a total sliding weight of 148± 0.5 gms. The total rod shall pass through two guides. (To ensure vertical movement) fixed to a stand.
  • Suitable provision will be made for clamping the vertical rod at any desired height above the surface of the paste in the trough.
  • A brass trough 50 mm internal diameter and 50 mm depth.


Optional Accessories:

  • Glass Plate: 10mm thick and about 45-50 cm square.
  • Spatula : Flexible with blade about 8 cm long & 2 cm wide
  • Evaporating dish: Made from porcelain material 



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