ASTM C390-79(2000)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: C 390 – 79 (Reapproved 2000)
Standard Criteria for
Sampling and Acceptance of Preformed 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 (ϵ) 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 3.1.2 inspection—the process of measuring, examining,
testing, gaging, or otherwise comparing the unit with the
1.1 This standard provides criteria for establishing the
applicable requirements.
acceptability of lots or shipments of preformed thermal insu-
3.1.3 inspection lot—a collection of units of product from
lation based on sampling and inspection.
which a sample is drawn and inspected to determine confor-
1.2 This standard is intended for use in conjunction with
mance with the acceptability criteria.
appropriate ASTM material specifications that classify and
3.1.3.1 Discussion—An inspection lot may differ from a lot
describe the specific physical requirements for the product in
defined for other purposes.
terms of qualification requirements and inspection require-
3.1.4 inspection, normal—inspection that is used in accor-
ments. Determination of nonconformity shall be based on the
dance with an acceptance sampling scheme when a process is
tolerances for individual sample test values prescribed in the
considered to be operating at, or slightly better than, its
material specification.
acceptable quality level.
1.3 This standard may require inspection substantially dif-
3.1.5 inspection, tightened—a feature of a sampling scheme
ferent from that performed in the normal course of production.
using stricter acceptance criteria than those used in normal
Ifthepurchaserrequiressamplingandacceptanceinspectionin
inspection. Tightened inspection is used in some sampling
accordance with these criteria, he shall so specify in the order
schemes as a protective measure to increase the probability of
or contract.
rejecting lots when experience shows the level of submitted
1.4 This standard does not purport to address all of the
quality has deteriorated significantly.
safety concerns, if any, associated with its use. It is the
3.1.5.1 Discussion—It is expected that the higher rate of
responsibility of the user of this standard to establish appro-
rejections inherent with tightened inspection will lead the
priate safety and health practices and determine the applica-
supplier to improve the quality of the submitted product. The
bility of regulatory limitations prior to use.
criteria for determining when quality has deteriorated signifi-
2. Referenced Documents cantly must be defined in objective terms for any given
sampling scheme.
2.1 U.S. Military Standard:
3.1.6 lot (batch)—a definite quantity of some product
MIL-STD-105D Sampling Procedures and Tables for In-
manufactured under conditions of production that are consid-
spection by Attributes
ered uniform.
3. Terminology
3.1.7 lot size—the number of units in a lot or inspection lot.
3.1.8 nonconforming unit—a unit of product or service
3.1 Definitions:
containing at least one nonconformity.
3.1.1 acceptance number—the maximum number of the
3.1.9 nonconformity—a departure of a quality characteristic
nonconformitiesornonconformingunitsinthesamplethatwill
from its intended level or state that occurs with a severity
permit acceptance of the inspected lot or batch.
sufficient to cause the product or service not to meet a
specification requirement.
3.1.10 sample—a group of units, portion of material, or
This criteria is under the jurisdiction of ASTM Committee C-16 on Thermal
observations taken from the inspection lot that serves to
Insulation and is the direct responsibility of Subcommittee C16.31 on Chemical and
Physical Properties.
provide information that may be used as a basis for making a
Current edition approved Dec. 28, 1979. Published February 1980. Originally
decision concerning the lot being inspected.
published as C 390 – 57 T. Last previous edition C 390 – 60 (1984)ϵ .
3.1.11 sample size—the number of units in a sample or the
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. number of observations in a sample.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
C 390 – 79 (2000)
3.1.12 unit—an object on which a measurement or obser- quirements for properties with potentially high variability, or
vation may be made. requirements providing indirect control of performance char-
3.2 Descriptions of Terms Specific to This Standard: acteristics.
3.2.1 lot—an inspection lot as defined in 3.1.3.
3.2.2 shipping package—the smallest discrete package of
6. Acceptance for Qualification Requirements
thermal insulation for purposes of shipping. Typically, a
6.1 The supplier’s certificate of compliance or a third
shipping package is one roll, bundle, bag, or carton of thermal
party’s certificate of compliance shall be sufficient basis for
insulation.
acceptance of the lot for qualification requirements.
3.2.3 unit—a shipping package as described in 3.2.2.
6.1.1 The certificate shall state that compliance to the
qualification requirements has been verified by actual inspec-
4. Significance and Use
tion of material manufactured within the past three years using
4.1 The sampling and inspection prescribed in this standard
the same basic ingredients and manufacturing process as the
afford the purchaser a practical level of quality assurance on
material offered.
incoming material. They are based on cost/risk relationships
6.1.2 The supplier shall furnish an inspection report upon
considered typical for preformed thermal insulations offered
request.
for general use. In all cases, the purchaser should review this
standard and determine its suitability in terms of his specific
7. Acceptance for Inspection Requirements
needs.
7.1 Theacceptanceofalotforinspectionrequirementsshall
4.2 This procedure is intended primarily for the inspection
be based on the sampling plan and acceptance criteria pre-
of a continuing stream of lots, and there is not a high
scribed in Table 1.
probability of rejecting occasional off lots. Consumer protec-
7.2
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