ASTM C390-03

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:C390–03
Standard Practice for
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Sampling and Acceptance of Thermal Insulation Lots
This standard is issued under the fixed designation C 390; 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 of sampling inspection is the limit of a satisfactory process
average. The listedAQL(AQL=10%) is the maximum percent
1.1 This standard provides criteria for establishing the
defective level accepted 95% of the time by the sampling plan.
acceptability of lots of shipments of preformed board, pre-
3.1.2 acceptance number—the maximum number of the
formed block and pipe, and batts and blanket thermal insula-
nonconformitiesornonconformingunitsinthesamplethatwill
tion based on sampling and inspection.
permit acceptance of the inspected lot or batch.
1.2 This standard is intended for use in conjunction with
3.1.3 inspection—the process of measuring, examining,
appropriate ASTM material specifications that classify and
testing, gaging, or otherwise comparing the unit with the
describe the specific physical requirements for the product in
applicable requirements.
terms of qualification requirements and inspection require-
3.1.4 inspection lot—a collection of units of product from
ments. Determination of nonconformity shall be based on the
which a sample is drawn and inspected to determine conform-
tolerances for individual sample test values prescribed in the
ance with the acceptability criteria.
material specification.
3.1.4.1 Discussion—An inspection lot may differ from a lot
1.3 This standard may require inspection substantially dif-
defined for other purposes.
ferent from that performed in the normal course of production.
3.1.5 inspection, normal—inspection that is used in accor-
Ifthepurchaserrequiressamplingandacceptanceinspectionin
dance with an acceptance sampling scheme when a process is
accordancewiththispractice,heshallsospecifyintheorderor
considered to be operating at, or slightly better than, its
contract.
acceptable quality level.
1.4 This standard does not purport to address all of the
3.1.6 inspection, tightened—a feature of a sampling scheme
safety concerns, if any, associated with its use. It is the
using stricter acceptance criteria than those used in normal
responsibility of the user of this standard to establish appro-
inspection. Tightened inspection is used in some sampling
priate safety and health practices and determine the applica-
schemes as a protective measure to increase the probability of
bility of regulatory limitations prior to use.
rejecting lots when experience shows the level of submitted
2. Referenced Documents
quality has deteriorated significantly.
3.1.6.1 Discussion—It is expected that the higher rate of
2.1 ASTM Standards:
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rejections inherent with tightened inspection will lead the
C 168 Terminology Relating to Thermal Insulation
supplier to improve the quality of the submitted product. The
2.2 U.S. Military Standard:
criteria for determining when quality has deteriorated signifi-
MIL-STD-105E Sampling Procedures and Tables for In-
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cantly must be defined in objective terms for any given
spection by Attributes
sampling scheme.
3. Terminology
3.1.7 lot (batch)—a definite quantity of some product
manufactured under conditions of production that are consid-
3.1 Definitions:
ered uniform.
3.1.1 acceptable quality level (AQL)—when a continuous
3.1.8 lot size—the number of units in a lot or inspection lot.
seriesoflotsisconsidered,thequalitylevelwhichforpurposes
3.1.9 nonconforming unit—a unit of product or service
containing at least one nonconformity.
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This practice is under the jurisdiction of ASTM Committee C16 on Thermal
3.1.10 nonconformity—a departure of a quality characteris-
Insulation and is the direct responsibility of Subcommittee C16.31 on Chemical and
tic from its intended level or state that occurs with a severity
Physical Properties.
Current edition approved April 10, 2003. Published May 2003. Originally
sufficient to cause the product or service not to meet a
approved in 1957. Last previous edition approved 2002 as C 390 –02.
specification requirement.
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Annual Book of ASTM Standards, Vol 04.06.
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C390–03
3.1.11 sample—a group of units, portion of material, or material, involve hi
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