Sealer for trivalent chromium black passivation


  • Superb appearance with no recess-fill problems.
  • Uniform luster is obtained with no color inconsistency.
  • Can be processed at room temperature.

Product Specifications

Bath makeup conditions

Chemicals used Usage range
Barrel Rack
METASU CR-CL1(A) 30 – 40 % 20 – 30 %

Usage conditions

Item Range Remark
Process temperature 27 – 35°C
Process time 20 – 35 seconds
pH 7.5 – 9.0 Use ammonia for adjustment if pH value falls outside of the specified range. Do not use acid.



Inquiry about the product

Feel free to contact us if you have any questions or matters to discuss.