ASTM D1898-68(1989)
(Practice)Standard Practice for Sampling of Plastics (Withdrawn 1998)
Standard Practice for Sampling of Plastics (Withdrawn 1998)
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: D 1898 – 68 (Reapproved 1989)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
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Sampling of Plastics
This standard is issued under the fixed designation D 1898; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
Specific 12 to 15
Apendixes:
1.1 This practice is primarily a statement of principles to
Glossary X1
guide purchasers of plastic materials purchased under specifi-
Inspection by Attributes X2
Inspection by Variables X3
cations to prepare sampling plans that will describe sampling
Example of Use of Previous Data for Judging the
procedures and that will enable them to determine within
Qualities of Lots and for Setting Specification
practical limits whether or not the products meet the specifi- Limits X4
cations.
1.8 The values stated in SI units are to be regarded as the
1.2 The same principles may be used to guide the prepara-
standard.
tion of specifications in quantitative terms.
1.9 This standard may involve hazardous materials, opera-
1.3 Some of the same principles may be used to determine
tions, and equipment. This standard does not purport to
the actual quality of a product, including its average and
address all of the safety problems associated with its use. It is
variation above and below that average, with respect to a
the responsibility of the user of this standard to establish
particular property.
appropriate safety and health practices and determine the
1.4 Since the design of probability sampling depends upon
applicability of regulatory limitations prior to use.
the ultimate use of the samples and the resulting data, consid-
eration must be given to the intended inspection of the samples.
2. Referenced Documents
Hence, the design of plans for examination and testing of
2.1 ASTM Standards:
samples for both their attributes and their variables is included.
E 122 Practice for Choice of Sample Size to Estimate the
1.5 This practice is intended for general guidance when 2
Average Quality of a Lot or Process
little information is available on the variability of the material
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2.2 Military Standards:
and of the method of inspection. In some cases, quality control
MIL-STD-105 Sampling Procedures and Tables for Inspec-
chart methods may be substituted for the procedures herein. In
tion by Attributes
any event, a statistician should be consulted if difficulty is
MIL-STD-414 Sampling Procedures and Tables for Inspec-
encountered in applying the recommendations herein to the
tion by Variables for Percent Defective
design of a specific sampling problem.
1.6 There is no intent to guide the disposition of material
3. Significance and Use
that is found to be off-specification by sampling and inspection;
3.1 The purpose of the sample may be as follows:
disposition is a contractual matter.
3.1.1 To estimate properties of a lot or shipment, such as the
1.7 The following outline is presented to facilitate use of
percentage of some constituent, the fraction of the items that
this practice:
fail to meet a specific requirement, the average weight or
Section
property of an item, or the quality or total weight of the
shipment, or simple identity.
General Philosophy 4
Sampling of Attributes 5 3.1.2 To dispose of the lot or shipment rationally, without
Sampling for Variables 6
the intermediate step of the formation of an estimate.
Means and Standard Deviations 7
3.1.3 To define new materials in terms of their properties.
Comparison of Sampling Plans 8
Sampling Procedures:
3.1.4 To provide material for evaluation of a test method.
General 9 to 11
Random 10
4. General Philosophy
Stratified 11
4.1 Sampling is a means employed to meet the problem of
estimating the quality of a lot from the inspection of only part
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This practice is under the jurisdiction of ASTM Committee D-20 on Plastics
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and is the direct responsibility of Subcommittee D20.13 on Statistical Techniques. Annual Book of ASTM Standard, Vol 14.02.
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Current edition approved Jan. 10, 1968. Published March 1968. Originally Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
published as D 1898 – 61 T. Last previous edition D 1898 – 61 T. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
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D 1898
of the lot. When 100 % inspection (“screening”) of a lot is part by the frequency of occurrence of their attributes, that is,
performed, sampling
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