Cir. No.16/16/1994-CX, dt. 03/02/1994
- Document type
- Circular
- Reference no.
- A
- Dated
Surface Finishing & Electroplating
Subject: Classification of Surface Finishing & Electroplating Chemicals
I am directed to say that doubts have been expressed regarding classification of surface finishing and electroplating chemicals.
2. The mater was referred to the Chief Chemist, CRCL, New Delhi for his opinion in the matter. Chief Chemist, CRCL has stated (copy of the opinion enclosed) that the technical information available reveals that various substances or formulations are used for the treatment of the metal before it is electroplated. The classification of these products or formulations depend on their composition individually, for example pickling preparations /all under 38.10, polishing compounds fall under 34.05, and cleaning preparations containing organic surface active agents under 34.02. The Chief Chemist, CRCL is of the view that a general classification for all chemical preparations/formulations used in the electroplating operation can not be given as much would depend upon the actual chemical composition of the products, and such surface finishing and electroplating chemicals should be classified considering their composition.
3. The opinion of the Chief Chemist, CRCL has been accepted by the Board. Accordingly, it is clarified that the classification of the surface finishing and electroplating chemicals may be decided on the basis of their chemical composition.
4. All pending assessments may be finalised on the above basis. Lower field formations may be advised suitably. The trade may also be informed accordingly.
sd/-
(Rajiv Bhatia)
Under Secretary (CX.3)
Central Board of Excise & Customs
F.No. 90/1/93-CX-3
The file has been referred to give my views on the classification of surface
finishing and electroplating chemicals.
According to technical literature cleaning the surface of the metal is an
important process. This preplating treatment is necessary to prepare the surface to
accept an adherent deposit. An ideal surface would be one consisting entirely of atoms
of the metal to be plated upon and having no foreign material at all. The cleaning
cycle includes :-
(1) Pickling to remove gross scale
(2) Mechanical preparation such as polishing and buffing.
(3) Cleaning to remove oils, greases, shop dirt and polishing and butting compounds
(4) rinsing
(5) acid dipping to remove oxide films
(6) rinsing
Formulations for cleaning solutions vary. These can be tailored to the
specific conditions.
The above technical information reveals the various substances or formulations
are used for the treatment of the metal before it is electroplated. The classification
of these products or formulations depends on their composition individually for
Example-pickling preparations fall under 38.10, polishing compounds fall under 34.05,
cleaning preparations containing organic surface" active agents under 34.02.
In view of the above discussion, I am of the opinion that a general
classification for all chemical preparations/formulations used in the electroplating
operations can not be given, much would depend upon the actual chemical composition of
th6 products, and such surface finishing and electroplating chemicals should be
classified considering their composition.
Sd/-
(Dr. Badri Prasad)
Chief Chemist, Central Revenues