Find the most up-to-date version of ASTM B at Engineering Purchase your copy of ASTM B – 70() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. ASTM B + REDLINE: STANDARD PRACTICE FOR RATING OF ELECTROPLATED PANELS SUBJECTED TO ATMOSPHERIC EXPOSURE – INCLUDES.
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Enter your account email address to request a password reset: Print 1 2 3 4 5 page sstarting from page current page. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Similarly contact and rack marks, mounting holes, and so forth, should be disregarded. Assignment of Appearance Rating 7. Therefore, the appearance rating cannot be assigned with the same degree of precision as can the protection rating. Accordingly, this practice assigns separate ratings to 1 appearance as affected by corrosion of the substrate and 2 appearance as affected by deterioration of the coating itself.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. These photographs and charts4 are 10 by 15 cm 4 by 6 in. R is rounded off to the nearest whole number, leading to the tabulation given in Table 1. It has been used also for rating similar panels that have been subjected to accelerated tests such as those covered by Practice BMethod BTest Method Band Test Method B Such procedure shall be con?
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Corrosion pits probably not extending through to the basis metal—that is absence of obvious basis metal corrosion products bleeding therefrom. One point is assessed if the defects can be classi? Accordingly, rating numbers shall be derived from the type of defect that exists, that is: Such panels may arbitrarily be assigned one of two appearance ratings: If there are surface defects not accounted for in the protection rating, the appearance rating will be one or more units lower than the protection rating.
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Difficulties may be encountered in attempting to rate severely corroded panels. Enter your personal account email address to request a password reset: There were no books found for the applied search filters. Originally approved in Inspection should be made in the as-is condition, and defects to be taken into account are only those that can be seen with the unaided eye at normal reading distance. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
For this reason, the same standard comparison photographs or charts are not suitable for use at both types of locations; photographs are more helpful in assessing panels exposed to marine atmospheres, whereas dot charts can be used for industrial locations Appendix X2.
For example, surface pits that begin to detract from re?
Peeling of the coating from the substrate, or of one b357 from another, is the principal such defect. Typical decorative deposits exposed to marine atmospheres often tend to fail by crater astj, whereas in industrial atmospheres, they are more likely to exhibit pinpoint rusting; and the latter atmosphere also tends aatm be more severe with regard to degradation of the coating system but somewhat less severe with regard to basis metal corrosion. Remember me for one month. Please sign into an account with a subscription to this content, or email for help at support madcad.
Assignment of Protection Rating 6. One method of facilitating this comparison is to remove individual panels from their racks and place them beside other panels. ASTM grants you a license as follows: For example, if a panel rates as low as 4 for protection, it may be difficult to assess any additional appearance defects.
If you feel that your comments have not received satm fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Types of Defects 4. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its asym and application. Register for a trial account.
A number in parentheses indicates the year of last reapproval. You currently cannot view this content. Preparation for and Manner of Inspection NOTE 4—It may be desirable to expose panels for test even though they are defective in certain respects before exposure. This method is used with standard-sized panels exposed on standard ASTM racks at outdoor test sites in both natural atmospheres and accelerated test conditions.
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In that case, an inspection should be made and recorded before the asmt are exposed. The electronic file may not be reproduced in any way.
At the option of the inspector, this difficulty may be handled as follows: Fractional ratings below 9, although normally not especially useful, may be assigned if desired. It has been used also for rating similar panels that have been subjected to accelerated tests such as those covered by Practice B, Method B, Test Method B, and Test Method B Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Historical Version s – view previous versions of standard. Permanent or massive type of basis metal corrosion such as that in pinholes, bare, or?
Since corrosion of the substrate also detracts from appearance, the appearance rating can be no higher than the protection rating.