Chrome Ligno Sulfonate (CLS)

Chrome Ligno Sulfonate is a dark-brown colored powder, is special thinner used in drilling fluids. It has the character of anti-high temperature and anti-electrolytes, suitable to fresh water, salt water and saturated salt water mud.


Moisture % 8.5 max
Material insoluble % 2.5 max
Calcium Sulfate % 3.0 max
Total Cr % 3.6-4.2
Cr Complex % 75.0 min

MUD Performance

 ApplicationsFresh water drilling mudSalt water drilling mud
Normal Temperature Apparent Viscosity mPa.s
Rate of reducing viscosity %
20 max
85 min
25 max
70 min
High Temperature Apparent Viscosity mPa.s
Rate of reducing viscosity %
30 max (150°)
65 min (150°)
45 min (150°)
60 min (150°)
  1. Anti high temperature, the mud keeps stable and unchanged for 16 hours when temperature reaches 150° -160°
  2. Anti electrolytes, it is suitable to every kind of mud.
  3. In 2% salt water, the mud added with CLS performs better than FCLS.


CLS is used as thinner for drilling fluids, may be added into drilling fluids in powders or in water solution with a dosage 0.5-1.0 % (W/V). Adjust the PH value in a range of 10-10.5


25 kg/ paper bag with PE bag inside.

For your CLS requirements or if you need additional information on our products, please contact us by phone or email us.

Technical Specification:

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