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.
|Published (Last):||11 July 2013|
|PDF File Size:||12.23 Mb|
|ePub File Size:||3.87 Mb|
|Price:||Free* [*Free Regsitration Required]|
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. It is the responsibility of the user of this standard to v602 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Such lots will be accepted Note 1. The constant interval is determined by dividing the lot size by the sample size and by rounding the quotient down to the nearest whole number.
If the test method to be used is nondestructive, the sample size shall be that directed in 8. Other tests can destroy the coating in nonessential locations, in which case the item can still be functional. Based on the results, a decision is made whether or not the lot conforms to the requirements. Based on the results, a decision is made either to accept or reject the inspection lot. In accordance with Table 3, a sample of items is to be drawn. Inspection lots that are unacceptable with respect to one or more requirements shall be rejected.
Screening of rejected lots will substantially increase the cost of inspection if the incoming lots are much worse aatm AQL quality.
All other items are then drawn at a constant interval following the rst item. The larger the proportion of nonconforming articles in an inspection lot, the more likely it will be that the sample will indicate that the lot is unacceptable.
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.
In plans of this type, several articles of product are drawn from a production lot. If only a few articles in an inspection lot are nonconforming, the chances are that the sample will indicate that the lot is acceptable; but there is a small chance that the sample will indicate that the lot is unacceptable.
ASTM B602 – 88(2016)
Signicance and Use ast. They may be replaced with conforming articles. A sampling plan is selected that has a high probability of accepting lots of AQL quality and of rejecting lots of LQL quality.
Formation of Inspection Lot 7. There may be instances in which tighter or looser plans or ones that are more discriminating are desired. When the incoming lots are of a good quality level, the average quality level of a series of lots will be even asym when the rejected lots are screened and resubmitted. Screening is to be used only when required by the purchaser.
A table of random numbers Table A1. A sampling plan is selected that will accept most submitted inspection lots of AQL quality and reject most lots of LQL quality. The specific plans selected are identified in Tables 1- 3 of this test method. Also, Guide B describes the nature asmt attribute sampling plans and the several factors that must be considered in the selection of a sampling plan.
This last plan utilizes smaller samples and so reduces the cost of inspection but with a sacrice in the ability to distinguish between acceptable and unacceptable lots. The AQL is the quality level that is considered to be acceptable.
Electrodeposited coatings, Inorganic coatings, Inspection, Inspection and verification, Metallic coating, Paint related coatings, Protective coatings, Wstm.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
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 use. If it is less, the lot does not conform.
One of these Table 2 is considered to be standard and is the one that h602 followed unless the user of this method species either a higher quality level Table 1 or a lower one Table 3. NOTE 3—The plan given for destructive tests uses smaller samples than the plans given for nondestructive tests.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
The fourth plan is intended to be used when the inspection methods are destructive. When incoming lots are of a poor quality level, the average quality of a series of lots will again be good because many of the incoming lots will be rejected and upgraded. Link to Active This link will always route to the current Active version of the standard.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. If the articles are not so mixed, and if it is thought to be impractical to mix them, bias will result if the entire sample is drawn from a single or a few layers.
Other bias in sampling, such as taking articles from the same place on a plating rack, taking articles from the output of one electroplating bath and not others, and taking articles that appear to be conforming or to be nonconforming, must be avoided. If the test method is destructive, the sample size shall be that directed in 8. The same sampling plan that was used when the lot was rst inspected shall be used for the reinspection of the screened lot.
Take the rst two digits in each group of ve digits.
This standard does not contain the Military Standard’s requirement for tightened inspection when the quality history of a supplier is unsatisfactory. The correct values are obtained by multiplying the tabulated values by: It is the worst condition that can occur under rectifying inspection. For example, if a sample of 50 articles drawn in accordance with Table 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.
Often in such cases test specimens are coated along with the articles and are used to represent them in the destructive tests. The possibility exists that some of the uninspected articles are nonconforming.
Some pocket calculators are designed to generate random numbers. The permission to use test specimens and the requirements covering them and their use should be set forth in the applicable coating specication, purchase order, or other governing document.
Learn more about the cookies we use and how to change your settings. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.