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Paint/Protective Coatings Engineering: FBE Coating of Reinforcement Bars as per ASTM A775

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    • CommentAuthorkraj
    • CommentTimeSep 22nd 2007
     permalink
    Hi,


    We have a supplier supplying the reinforcement bars FBE coated as per ASTM A 775. It has been noted that as per A 775 blasted surface to be checked for the surface profile to ensure the roughness with replica tapes (clause 6.1) and salt contaminations test as identified on note 7 on the blasted surface. As all of you aware the diameter of these rods commonly used are in the range from 10 – 60 mm and the surface also is not plain, use of these replica tape measurement and salt contamination is not possible and also won’t provide the actual measurement due to circular shape. [Insufficient plain contact area for proper placement of the inspection tool]. We suggest using sample test plates at the start of the shift, if the blasting and coating activity will proceed on the established set parameters.

    Regarding the Adhesion test, clause 9.3 states one bar at every eight production hours looks like very extreme one, since the testing itself will take 168 hours. We feel testing one bar for each batch number of the powder coating material is sufficient to verify the adhesion properties instead of every 8 hours. If any problem occurs it can be easily identified at the stage of coating flexibility test (Bend test) itself since it has been conducted for every 4 hours.

    Please let we have your opinion and comment on this.
  2.  permalink
    if the FBE is cooled with water then you can carry out a cross hatch on it there for not having to wait 160 odd hrs to cure,

    The cross hatch is simple and easy. Most cliants are happy with this as they know, (well some do) Production is everything, and they need it to get there free t-shirts at the best of time. Simple and easy. I work with FBE all the time and if there is a fault then it will show in a cross hatch.

    Also to try a swab test. These two cover any issues.

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