This standard is issued under the fixed designation B; the number 1 This test method is under the jurisdiction of ASTM Committee B08 on Metallic. ASTM B_机械/仪表_工程科技_专业资料。 Designation: B – 88 ( Reapproved ) Standard Test Method for Attribute Sampling. Purchase your copy of ASTM B – 88() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards.
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The possibility exists that some of the wstm articles are nonconforming. Please download Chrome or Firefox or view our browser tips. Accept and continue Learn more about the cookies we use and how to change your settings.
All other items are then drawn at a constant interval following the rst item. One of these Table 2 is considered to be standard and is the one that is followed unless the user of this method species either a higher quality level Awtm 1 or a lower one Table 3. A table of random numbers Table A1. The specific plans selected are identified in B6602 of this test method. The same sampling plan that was used when the lot was rst inspected shall be used for the reinspection of the screened lot.
ASTM International b60 no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Also, some test methods are destructive, in which cases sampling inspection must be used to avoid destroying the lot. Such lots will always be accepted. If the purchaser does not specify the level, Level II shall be used. Through the use of sampling plans, the risk of error is known and controlled.
Electrodeposited coatings, Inorganic coatings, Inspection, Inspection and verification, Metallic coating, Paint related coatings, Protective coatings, Sampling.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
This standard does not contain the Military Standard’s requirement awtm tightened inspection when the quality history of a supplier is unsatisfactory. Throughout this method, it is assumed that no mistakes are made in sampling, measurement, and calculation. If only a few articles in an inspection lot are nonconforming, the sample probably will indicate that the lot is acceptable; but there is a small probability that the sample will indicate that the lot is unacceptable.
If the standard deviation of the process is not known, the standard deviation of the sample is calculated and used. The larger the proportion of nonconforming articles in an inspection lot, the more likely it will be that the sample will indicate xstm the lot is unacceptable.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Screening is to be used only when required by the purchaser. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to asrm. This standard does not contain the Military Standard’s requirement for tightened inspection when the quality history of a supplier is unsatisfactory. Learn more about the cookies we use and how to change your settings.
These are explained in Test Method B Click to learn more. Through the use of sampling plans, the risk of error is known and controlled.
ASTM B602 – 88(2016)
Inspection lots sstm are unacceptable with respect to one or more requirements shall be rejected. The number is compared to a maximum allowable. Link to Active This link will always route to the current Active version of the standard.
In the extreme case of every article in an inspection lot being nonconforming, a sample will always indicate that the lot is unacceptable. Bias can be avoided by numbering the articles, randomly selecting a group of numbers equal to the sample size, and inspecting the articles with the selected numbers. Historical Version s – view previous versions of standard.
If one or more of these conditions are not met, a variables plan cannot be used. Variables plans are applicable when a test yields a numerical value for a characteristic, when the specication imposes a numerical limit on the characteristic, and when certain statistical criteria are met.
ASTM B – 90() Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
Based on the results, a decision is made whether or not the lot conforms to the requirements. Each article must be tested in the same way for example, coating thickness must be measured at b60 same location, see X2.
The faster, easier way to work with standards. So the selection of a sampling plan involves the balancing of the costs of inspection against the consequences of accepting an undesirable number of nonconforming articles. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine b6602 applicability of ast limitations prior to use. You may experience issues viewing this site in Internet Explorer 9, 10 or At intermediate quality asfm of incoming lots, the average quality level of a series of accepted lots will again be improved, but it will not be improved as much as in either of the above cases; and there will be an intermediate quality level where the aastm of improvement is the least.
The poorest average quality level that can result from the use of a given sampling plan when screening of rejected lots is done is called the Average Outgoing Quality Limit AOQL.
Current edition approved May 15, For example, if a sample of 50 articles drawn asrm accordance with Sstm 2 is found to contain two defectives with respect to thickness and a third one with respect to appearance, the inspection lot is acceptable because although three articles were defective no more than two, the acceptance number, were defective with respect to a single requirement.
NOTE 2—The nature of a destructive test can be such that the tested article can be reclaimed, for example by stripping and reapplying the coating. The specic plans selected are identied in Tables of this test method. If it is less, the lot does not conform. It is the worst condition that can occur under rectifying inspection. B — 88 Reapproved Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings1 This ast is issued under the xed designation B ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
Variables plans are applicable when a test yields a numerical value for a characteristic, when the specification imposes a numerical limit on the characteristic, and when certain statistical criteria are met. Last previous edition approved in as B — 88 There is no AOQL for the plans used with destructive tests because destructive tests cannot be bb602 to screen rejected lots.