|
UDC 591.873.6 Ref. No.: ISO/R 390 - 1964 (E)
IS0
I NT ERN AT I ON AL ORGAN I Z AT I O N FOR STAND AR D 12 AT 1 ON
IS0 RECOMMENDATION
R 390
SAMPLING AND INSPECTION
OF ASBESTOS-CEMENT PRODUCTS
1st EDIT I ON
November 1964
COPY RIGHT RESERVED
of IS0 Recommendations and IS0 Standards
The copyright
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
in Switzerland
Printed
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
---------------------- Page: 1 ----------------------
BRIEF HISTORY
The IS0 Recommendation R 390, Sampling and inspection oj asbestos-cement yro-
ducts, was drawn up by Technical Committee ISO/TC 77, Products in usbestos-cement,
the Secretariat of which is held by the Association Suisse de Normalisation (SNV).
Work on this question by the Technical Committee began in 1961 and led, in 1963,
to the adoption of a Draft IS0 Recommendation.
In December 1963, this Draft IS0 Recommendation (No. 688) was circulated to all
the IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of
an editorial nature, by the following Member Bodies:
Australia Israel Republic of Korea
Austria Italy Republic of South Africa
Belgium Japan Romania
Brazil Lebanon Spain
Colombia Morocco Sweden
Czechoslovakia Mexico Switzerland
Denmark Netherlands Turkey
Finland New Zealand U.A.R.
France Norway United Kingdom
Germany U.S.A.
Peru
Greece Poland U.S.S.R.
Hungary Portugal Venezuela
Ireland Yugoslavia.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in November 1964, to accept it as an IS0 RECOMMEND-
ATION.
For the practical application of IS0 Recommendation R 390, see the " Guide to the
use of the Recommendation concerning sampling and inspection of asbestos-cement
products ", currently under preparation.
-2
---------------------- Page: 2 ----------------------
lSO/R 390 . 1964 (E)
CONTENTS
Pages
. 4
1 Scope .
. Terminology . 4
2
3 . Division of a consignment into inspection lots .
4
3.1 Homogeneous consignments . 4
3.2 Non-homogeneous consignments . 4
4 .
. Sampling 4
5 . Inspection . 5
6 . Determination of acceptability of inspection lots . 5
6.1 Inspection by attributes . 5
6.2 Inspection by variables . 6
Appendix . 7
---------------------- Page: 3 ----------------------
lSO/R 390 - 1964 (E)
IS0 Recommendation R 390 November 1964
SAMPLING AND INSPECTION
OF ASBESTOS-CEMENT PRODUCTS
1. SCOPE
This Recommendation defines certain rules for batching, sampling, inspection and accept-
ance/rejection of asbestos-cement products.
The purpose of the Recommendation is to provide a uniform method to be used in deter-
mining whether supplies of asbestos-cement goods should be accepted as conforming to
the relevant Recommendation requirements for such products.
It provides for a double sampling plan for the method of inspection by attributes as well
as for an alternative single sampling plan for the method of inspection by variables.
2. TERMINOLOGY
Definitions of the various expressions used in this Recommendation are given in the
Appendix.
3. DIVISION OF A CONSIGNMENT INTO INSPECTION LOTS
3.1 Homogeneous consignments
3.1 .l Any homogeneous consignment (or sub-consignment - 3.2) should be divided
by the manufacturer into inspection lots, the maximum size of which is given in
the relevant Recommendation.
3.1.2 Any fraction of a consignment remaining after taking out the highest possible
number of maximum inspection lots and any homogeneous consignment (or sub-
consignment) smaller than the maximum lot size, form an inspection lot if larger
than the minimum lot size given in the relevant Recommendation.
3.1.3 Consignments or fractions of consignments smaller than the minimum lot
size given in the relevant Recommendation are not submitted to sampling and
testing.
3.2 Non-homogeneous consignments
Any consignment which is known to be or is expected to be non-homogeneous as regards
any of the properties to be tested by sampling should be divided by the manufacturer
into assumed homogeneous sub-consignments prior to the division into inspection
lots as per 3.1.
4. SAMPLING
4.1 From each inspection lot (3.1.1 and 3.1.2) the purchaser may draw a sample, the size
of which is indicated in table 1 (4.2 and 4.3).
4.2 The entry to table 1 is the number of units of product in the inspection lot (column I),
the sample size being indicated in column 2.
4 --
---------------------- Page: 4 ----------------------
ISO/R 390 - 1964 (E)
4.3 For products where all units undergo a compulsory non-destructive test during the
manufacture, the reduced sample size obtained by entering table 1 at column 7 may
be applied.
4.4 The possibility mentioned in 4.3 is also available when the manufacturer guarantees
or has his production guaranteed by an independent control organisation.
4.5 When test pieces are cut from the units of the sample, the cutting is carried out by
the manufacturer in the presence of the purchaser.
4.6 When the relevant Recommendation calls for more than one property to be tested, the
sample size should be appropriately multiplied so as to secure for each test a number
of test pieces equal to the sample size (4.2 and 4.3). From one unit of a sample one
test piece only should be cut for a particular test, but for different tests the necessary
test pieces may be cut from the same unit of the sample.
5. INSPECTION
5.1 Each unit of the sample should be tested as specified in the relevant Recommendation.
5.2 The test results should be evaluated either through the method of inspection by
attributes (5.4 and 6.1) or through the method of inspection by variables (5.5 and
6.2).
5.3 The method of inspection by attributes should normally be employed. However,
by agreement prior to the drawing of the samples (4.1), the method of inspection by
variables, if applicable, may be employed.
5.4 When the method of ins
...