ASTM D ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon? This standard has been approved for use by agencies of the Department of Defense. Scope 1.
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ASTM D ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon? This standard has been approved for use by agencies of the Department of Defense. Scope 1. The values given in parentheses are for information only. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Referenced Documents 2. Current edition approved Nov. Published December Originally approved in Last previous edition approved in as D — Terminology 3. Apparatus 5. ANSI B See Fig. The tool bit is typically mounted in a holder such as a wooden?
Typically the gripping surface is knurled. The tip may be replaceable or permanent. The following con? Position the tool so that only the tip is in contact with the surface. Pull the scribing tool to obtain a uniform V-cut through the coating that is being tested. The endpoints of the scribe shall be at least 1. Inspect the tool frequently, using low power magni? The scribe should be of sufficient length to cover the signi?
The scribe must penetrate all organic coating layers on the metal, leaving a uniformly bright line. The extent of scribe penetration through metal coatings, such as galvanize, should be agreed upon between the producer and user.
The coil coating industry typically requires scribes to penetrate all organic coating layers but not penetrate the metal coating layers. The automotive industry typically requires scribes to penetrate all organic and metal coating layers.
The pencil type may be less effective than the lathe tool type when scribing coating systems consisting of multiple layers of organic coatings or coating systems including metal layers.
When scribing coating systems consisting of multiple layers of organic coatings or coating systems including metal layers the depth and quality of scribe technique should be evaluated using the cross section, castable plastic mount, polishing technique described in Practice E 3.
Quality of the scribe technique may also be observed with the aid of low-power magni? Note, mark, and describe defects, coding, and? If a motorized circular blade is used, position the test specimen to allow for a straight, linear cut at the desired length.
The blade shall be positioned to a depth such that it is able to cut into the substrate. This type of blade will result in a rectangular cut rather than a V-cut. The use of more than one cut must be agreed to between all concerned parties prior to scribing, and the number of cuts must be recorded in the test documentation.
When multiple cuts are needed, each cut must 5. Preliminary Treatment of Test Specimens 6. This position will allow solution droplets to run lengthwise along the scribe. If a motorized blade is being used, it may be necessary to clean out residual materials of the scribe with a pencil-type scriber. Exposure of Test Specimens 7. The length of test and evaluation intervals should be agreed upon prior to exposure of specimens.
Remove coating along scribe with one of the following methods such that all corrosion of the substrate that is, rust creepage or undercutting can be observed using one of the following methods. NOTE 1—The above methods may not be appropriate in all cases, such as for interim ratings in continuing tests. NOTE 2—For all methods, complete the removal of loose coating with 15 min of specimen removal from the exposure cabinet.
If removal cannot be completed within the prescribed time, immerse the specimens in water at room temperature or store in a plastic bag to avoid any drying effect.
Record the maximum and minimum creepage from the scribe, and note whether or not the maximum is an isolated spot. The mean can be determined by making at least 6 measurements of the width of the zone of corrosion uniformly distributed along the scribe, ignoring 3 mm 0. As an alternative, use Test Method D Record creep values in millimetres, inches, or rating numbers as prescribed in Table 1, as agreed upon between producer and user.
Loss of paint that does not extend down to the substrate and result in corrosion can be rated using the same procedure, but should not be considered as scribe creepage, undercutting, or corrosion. If this is the case, not the coat s removed. Procedure B—Evaluation of Unscribed Areas 9. Procedure C—Evaluation of Unprotected Edges Procedure D—Evaluation of Formed Areas Report
The values given in parentheses are for information only. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents. Worldwide Standards We can source any standard from anywhere in the world. Learn more about the cookies we use and how to change your settings.
Designation: D It is the. Referenced Documents. U s i n g Wati:r l r o g A;:paratus. Published December 20p8. Last previous edition approved in as D Paint and.
ASTM D1654 - 08(2016)e1