ASTM C390-08(2013)
(Practice)Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
SIGNIFICANCE AND USE
4.1 The sampling and inspection prescribed in this practice afford the purchaser a practical level of quality assurance on incoming material. They are based on cost/risk relationships considered typical for preformed thermal insulations offered for general use. In all cases, the purchaser should review this practice and determine its suitability in terms of his specific needs.
4.2 This procedure is intended primarily for the inspection of a continuing stream of lots, and there is not a high probability of rejecting occasional off lots. Consumer protection is based on economic pressure on the producer, through greater risk of lot rejection, to maintain the process average at 90 % conformance or better. Operating characteristic curves for the sampling plans employed can be found in Practice E2234, Table X-C through Table X-F.
4.3 It is not the intent of this procedure to estimate lot quality, control the quality of production, relieve the supplier of responsibility for the quality of material offered, or determine the disposition of material found to be defective after receipt by the purchaser.
SCOPE
1.1 This practice covers criteria for establishing the acceptability of lots of shipments of preformed board, preformed block and pipe, and batts and blanket thermal insulation based on sampling and inspection.
1.2 This practice is intended for use in conjunction with appropriate ASTM material specifications that classify and describe the specific physical requirements for the product in terms of qualification requirements and inspection requirements. Determination of nonconformity shall be based on the tolerances for individual sample test values prescribed in the material specification.
1.3 This practice may require inspection substantially different from that performed in the normal course of production. If the purchaser requires sampling and acceptance inspection in accordance with this practice, he shall so specify in the order or contract.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.
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Standards Content (Sample)
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Designation: C390 − 08 (Reapproved 2013)
Standard Practice for
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Sampling and Acceptance of Thermal Insulation Lots
This standard is issued under the fixed designation C390; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope butes Indexed by AQL
1.1 This practice covers criteria for establishing the accept-
3. Terminology
ability of lots of shipments of preformed board, preformed
3.1 Definitions—Definitions pertaining to thermal insulat-
block and pipe, and batts and blanket thermal insulation based
ing materials are defined in Terminology C168.
on sampling and inspection.
3.1.1 acceptable quality level (AQL)—when a continuous
1.2 This practice is intended for use in conjunction with
seriesoflotsisconsidered,thequalitylevelwhichforpurposes
appropriate ASTM material specifications that classify and
of sampling inspection is the limit of a satisfactory process
describe the specific physical requirements for the product in
average. The listedAQL(AQL=10%) is the maximum percent
terms of qualification requirements and inspection require-
defectivelevelaccepted95%ofthetimebythesamplingplan.
ments. Determination of nonconformity shall be based on the
3.1.2 acceptance number—the maximum number of the
tolerances for individual sample test values prescribed in the
nonconformitiesornonconformingunitsinthesamplethatwill
material specification.
permit acceptance of the inspected lot or batch.
1.3 This practice may require inspection substantially dif-
3.1.3 inspection—the process of measuring, examining,
ferent from that performed in the normal course of production.
testing, gaging, or otherwise comparing the unit with the
Ifthepurchaserrequiressamplingandacceptanceinspectionin
applicable requirements.
accordancewiththispractice,heshallsospecifyintheorderor
3.1.4 inspection lot—a collection of units of product from
contract.
which a sample is drawn and inspected to determine confor-
1.4 The values stated in inch-pound units are to be regarded
mance with the acceptability criteria.
as standard. The values given in parentheses are mathematical
3.1.4.1 Discussion—An inspection lot may differ from a lot
conversions to SI units that are provided for information only
defined for other purposes.
and are not considered standard.
3.1.5 inspection, normal—inspection that is used in accor-
1.5 This standard does not purport to address all of the
dance with an acceptance sampling scheme when a process is
safety concerns, if any, associated with its use. It is the
considered to be operating at, or slightly better than, its
responsibility of the user of this standard to establish appro-
acceptable quality level.
priate safety and health practices and determine the applica-
3.1.6 inspection, tightened—a feature of a sampling scheme
bility of regulatory limitations prior to use.
using stricter acceptance criteria than those used in normal
inspection. Tightened inspection is used in some sampling
2. Referenced Documents
schemes as a protective measure to increase the probability of
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2.1 ASTM Standards:
rejecting lots when experience shows the level of submitted
C168 Terminology Relating to Thermal Insulation
quality has deteriorated significantly.
E2234 Practice for Sampling a Stream of Product by Attri-
3.1.6.1 Discussion—It is expected that the higher rate of
rejections inherent with tightened inspection will lead the
supplier to improve the quality of the submitted product. The
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This practice is under the jurisdiction of ASTM Committee C16 on Thermal
criteria for determining when quality has deteriorated signifi-
Insulation and is the direct responsibility of Subcommittee C16.31 on Chemical and
Physical Properties. cantly must be defined in objective terms for any given
Current edition approved Nov. 1, 2013. Published March 2014. Originally
sampling scheme.
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approved in 1957. Last previous edition approved 2008 as C390 – 08 . DOI:
3.1.7 lot (batch)—adefinitequantityofsomeproductmanu-
10.1520/C0390-08R13.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
factured under conditions of production that are considered
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
uniform.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 3.1.8 lot size—the number of units in a lot or inspection lot.
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