Indian Raod cngress

Section 1900
Structural Steel
(viii)
Zinc Rich Paints
Instead of introducing an inhibitive pigment into paint, metallic zinc
can be used and such paints can provide cathodic protection to steel.
1906.1.2 Surfaces which are inaccessible for cleaning and painting after fabrication
shall be painted as specified before being assembled for riveting.
All rivets, bolts, nuts, washer etc., are to be thoroughly cleaned and dipped into boiling
linseed oil conforming to IS:77.
All machined surfaces are to be well coated with a mixture of white lead conforming to
IS:34 and Mutton Tallow conforming to IS:887.
For site paintings, the whole of the steel work shall be given the second cover coat after
final passing and after touching up the primer and cover coats, if damaged in transit.
1906.1.3 Choice of painting system
The choice of suitable painting system is dependent on factors such as :
- Available application methods viz. brush, roller or spray
- Durability in a specific environment
- Availability of skilled manpower
- Cost effectiveness
It is therefore necessary to consult various manufacturers of paint and ascertain the above
aspects while deciding on the appropriate choice of painting system.
1906.1.4 Quality of paint : The paints which have been tested for the following
qualities as per the specifications given in the relevant IS codes should only be used :
- Weight Test (weight per 10 litre of paint thoroughly mixed)
- Drying time
- Flexibility and Adhesion
- Consistency
- Dry thickness and rate of consumption
1906.1.5 Unless otherwise specified, all painting and protective coating work shall
be done in accordance with IS:1477 (Part I).
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