ASTM C390-08e1
(Practice)Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
Standard Practice for Sampling and Acceptance of Thermal Insulation Lots
SIGNIFICANCE AND USE
The sampling and inspection prescribed in this standard 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 standard and determine its suitability in terms of his specific needs.
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 E 2234, Table X-C through Table X-F.
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 standard provides 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 standard 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 standard 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 vales 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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Designation: C390 − 08
StandardPractice for
1
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 Department of Defense.
1
´ NOTE—3.1 was editorially updated in June 2008.
1. Scope E2234 Practice for Sampling a Stream of Product by Attri-
butes Indexed by AQL
1.1 This standard provides criteria for establishing the
acceptability of lots of shipments of preformed board, pre-
3. Terminology
formed block and pipe, and batts and blanket thermal insula-
tion based on sampling and inspection.
3.1 Definitions—Definitions pertaining to thermal insulat-
ing materials are defined in Terminology C168
1.2 This standard is intended for use in conjunction with
3.1.1 acceptable quality level (AQL)—when a continuous
appropriate ASTM material specifications that classify and
seriesoflotsisconsidered,thequalitylevelwhichforpurposes
describe the specific physical requirements for the product in
of sampling inspection is the limit of a satisfactory process
terms of qualification requirements and inspection require-
average. The listedAQL(AQL=10%) is the maximum percent
ments. Determination of nonconformity shall be based on the
defective level accepted 95% of the time by the sampling plan.
tolerances for individual sample test values prescribed in the
material specification.
3.1.2 acceptance number—the maximum number of the
1.3 This standard may require inspection substantially dif- nonconformitiesornonconformingunitsinthesamplethatwill
ferent from that performed in the normal course of production.
permit acceptance of the inspected lot or batch.
Ifthepurchaserrequiressamplingandacceptanceinspectionin
3.1.3 inspection—the process of measuring, examining,
accordancewiththispractice,heshallsospecifyintheorderor
testing, gaging, or otherwise comparing the unit with the
contract.
applicable requirements.
1.4 The vales stated in inch-pound units are to be regarded
3.1.4 inspection lot—a collection of units of product from
as standard. The values given in parentheses are mathematical
which a sample is drawn and inspected to determine confor-
conversions to SI units that are provided for information only
mance with the acceptability criteria.
and are not considered standard.
3.1.4.1 Discussion—An inspection lot may differ from a lot
1.5 This standard does not purport to address all of the
defined for other purposes.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1.5 inspection, normal—inspection that is used in accor-
priate safety and health practices and determine the applica- dance with an acceptance sampling scheme when a process is
bility of regulatory limitations prior to use. considered to be operating at, or slightly better than, its
acceptable quality level.
2. Referenced Documents
3.1.6 inspection, tightened—a feature of a sampling scheme
2
2.1 ASTM Standards:
using stricter acceptance criteria than those used in normal
C168 Terminology Relating to Thermal Insulation
inspection. Tightened inspection is used in some sampling
schemes as a protective measure to increase the probability of
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rejecting lots when experience shows the level of submitted
This practice is under the jurisdiction of ASTM Committee C16 on Thermal
Insulation and is the direct responsibility of Subcommittee C16.31 on Chemical and
quality has deteriorated significantly.
Physical Properties.
3.1.6.1 Discussion—It is expected that the higher rate of
Current edition approved April 15, 2008. Published May 2008. Originally
rejections inherent with tightened inspection will lead the
approved in 1957. Last previous edition approved 2003 as C390 – 03. DOI:
10.1520/C0390-08E01.
supplier to improve the quality of the submitted product. The
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
criteria for determining when quality has deteriorated signifi-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cantly must be defined in objective terms for any given
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. sampling scheme.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C390 − 08
3.1.7 lot (batch)—adefinitequantityofsomeproductmanu- 4.3 It is not the intent of this procedure to estimate lot
factured under
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
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Designation:C390–03 Designation: C 390 – 08
Standard Practice for
1
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 (´) 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
e NOTE—3.1 was editorially updated in June 2008.
1. Scope
1.1 This standard provides 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 standard 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 standard 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
1.4 The vales 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.
2. Referenced Documents
2.1 ASTM Standards:
C 168Terminology Relating to Thermal Insulation
2.2 U.S. Military Standard:
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MIL-STD-105ESampling Procedures and Tables for Inspection by Attributes
C 168 Terminology Relating to Thermal Insulation
E 2234 Practice for Sampling a Stream of Product by Attributes Indexed by AQL
3. Terminology
3.1Definitions:
3.1 Definitions—Definitions pertaining to thermal insulating materials are defined in Terminology C 168
3.1.1 acceptable quality level (AQL)—when a continuous series of lots is considered, the quality level which for purposes of
sampling inspection is the limit of a satisfactory process average. The listedAQL (AQL=10%) is the maximum percent defective
level accepted 95% of the time by the sampling plan.
3.1.2 acceptance number—the maximum number of the nonconformities or nonconforming units in the sample that will permit
acceptance of the inspected lot or batch.
3.1.3 inspection—the process of measuring, examining, testing, gaging, or otherwise comparing the unit with the applicable
requirements.
3.1.4 inspection lot—a collection of units of product from which a sample is drawn and inspected to determine conformance
with the acceptability criteria.
3.1.4.1 Discussion—An inspection lot may differ from a lot defined for other purposes.
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This practice is under the jurisdiction ofASTM Committee C16 onThermal Insulation and is the direct responsibility of Subcommittee C16.31 on Chemical and Physical
Properties.
Current edition approved April 10, 2003.15, 2008. Published May 2003.2008. Originally approved in 1957. Last previous edition approved 20022003 as C 390 – 023.
2
Annual Book of ASTM Standards, Vol 04.06.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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C390–08
3.1.5 inspection, normal—inspection that is used in accordance with an acceptance sampling scheme when a process is
considered to be operating at, or slightly better than, its acceptable quality level.
3.1.6 inspection, tightened—a feature of a sampling scheme using stricter acceptance criteria than those used in normal
inspection. Tightened inspection is used in some sampling schemes as a protective measure to increase the probability of rejecting
lots when e
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