IEC 61189-2:1997/AMD1:2000

INTERNATIONAL IEC
STANDARD
61189-2
AMENDMENT 1
2000-01
Amendment 1
Test methods for electrical materials,
interconnection structures and assemblies –
Part 2:
Test methods for materials for interconnection
structures
Amendement 1
Méthodes d'essai pour les matériaux électriques,
les structures d'interconnexion et les ensembles –
Partie 2:
Méthodes d'essai des matériaux pour structures
d'interconnexion
 IEC 2000  Copyright - all rights reserved
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– 2 – 61189-2 Amend. 1 © IEC:2000(E)

FOREWORD
This amendment has been prepared by IEC technical committee 52: Printed circuits.

The text of this amendment is based on the following documents:

FDIS RVD
52/832/FDIS 52/840/RVD
Full information on the voting for the approval of this amendment can be found in the report on

voting indicated in the above table.
A bilingual version of this amendment may be issued at a later date.
___________
Page 3
CONTENTS
Add the following table to the list of tables:
Table 5 – Number of plies per specimen as a function of glass thickness
Add the following figures to the list of figures:
Figure 13 – Thickness measuring points
Figure 14 – Test fixture
Figure 15 – Example of prepreg melting viscosity
Figure 16 – Position of specimens for resin content
Figure 17 – Differential scanning colorimeter
Figure 18 – Thermomechanical analysis (expansion mode)
Figure 19 – Scaled flow test specimen before lamination

Figure 20 – Scaled flow test specimen measurement points
Figure 21 – Location of specimens on original sheet for dimensional stability test
Figure 22 – Location of marks on specimen for dimensional stability
Add the following annexes to the list of annexes
Annex C (normative) Laboratory pro forma (form)
Annex D (informative) Laboratory pro forma (form)

61189-2 Amend. 1 © IEC:2000(E) – 3 –

Page 9
2 Normative references
Insert, in the existing list, the titles of the following standards:

IEC 60068-1:1988, Environmental testing – Part 1: General and guidance

IEC 60249-1:1982, Base materials for printed circuits – Part 1: Test methods

IEC 60326-3:1991, Printed boards – Part 3: Design and use of printed boards
IEC 60707:1981, Methods of test for the determination of the flammability of solid electrical
insulating materials when exposed to an igniting source
ISO 3274:1996, Geometrical Products Specifications (GPS) – Surface texture: Profile method –
Nominal characteristics of contact (stylus) instruments
ANSI/UL-94:1996, Standard for tests for flammability of plastic materials for parts in devices
and appliances
Page 17
7.1 Test 2D01: Thickness
(under consideration)
Replace this subclause by the following subclause:
7.1 Test 2D01: Thickness of base materials and rigid boards
7.1.1 Object
This test method covers the procedure for the determination of the thickness of base materials,
clad or unclad.
7.1.2 Test specimens
Standard sheet sizes of metal-clad or unclad base materials.

Standard panel sizes of metal-clad or unclad base materials.
7.1.3 Test apparatus and material
A suitable micrometer having a resolution of 0,01 mm or better shall be used.
7.1.4 Procedure
a) General conditions
– Test specimens shall be placed between the two faces of the micrometer, so that the
whole face of the pressure-foot will fall within the area of the material. The pressure-foot
shall be lowered gently, slowly and with great care onto the test specimen so that all
punching effect is avoided.
– 4 – 61189-2 Amend. 1 © IEC:2000(E)

– No stress shall be imposed by hand on the instrument or the material when a reading is

being taken. The reading shall be taken as soon as the pointer has ceased to move. It

is necessary to take care in avoiding parallax errors and vibrations which may

significantly affect the results.

b) Method 1
– This procedure is intended for the thickness measurement of the sheets of metal-clad

or unclad base materials.
– The specimen shall be held vertically or horizontally.

– Thickness to the nearest 0,01 mm at two points 25 mm or more inside each edge, at

eight points, and additionally at two points in the middle parts, so that a total of

10 points, shall be measured as shown in figure 13.
– The measurement shall be made twice at each point and the mean value shall be
determined as the thickness of each point.
– For automatic thickness inspection, continuous measuring shall be performed in
three measuring tracks parallel to the longitudinal axis of the sheet, two at least
25 mm from the longitudinal edges and the third near the midline.
25 min.
Measuring
points
25 min.
IEC  1890/99
Figure 13 – Thickness measuring points
c) Method 2
– This procedure is intended for the thickness measurement of panels of metal-clad or
unclad base materials. The thickness of the specimens held vertically or horizontally
shall be measured at the places which are agreed between the interested parties.
7.1.5 Report
The report shall include
a) the test method number and revision;
b) the date of the test;
c) the identification of the material tested;
d) a statement certifying that the test was carried out for as-received metal-clad or unclad
base materials;
e) the thicknesses measured and the nominal thickness with its tolerance;
f) any deviation from this test method;
g) the name of the person conducting the test.

61189-2 Amend. 1 © IEC:2000(E) – 5 –

7.1.6 Additional information
The use of a micrometer with a damping device, or controlled rate of movement of the
pressure-foot, is advantageous.

Page 39
8.6 Test 2C06: Flammability, vertical (under consideration)

Replace this subclause by the following subclause:
8.6 Test 2C06: Flammability, vertical burning test for rigid materials
8.6.1 Object
This test method is intended as a laboratory quality control technique using a low energy
source of ignition. Results from this test should not be used to attempt to predict the behaviour
of materials in a large-scale fire.
This test should be used for materials having good resistance to ignition. The test is carried out
using a small test flame having an intensity similar to that of an actual source of fire.
Timings measured by this test are an indication of the ability of the material(s) to self-
extinguish. There is no correlation with other properties of the material(s), such as the oxygen
index.
Materials suitable for testing in accordance with this technique include rigid substrates and
rigid substrates in combination with any surface coating(s).
8.6.2 Test specimens
The test specimens shall be prepared from a sample of the metal-clad base material under
test. The metal shall be completely removed using any etching method of commercial practice.
The specimen strip shall be (125 ± 5) mm long and (13 ± 0,3) mm wide. The edges shall be
smooth. The corners of the specimens shall be rounded with a radius not exceeding 1,3 mm.
The corners of the specimens shall be rounded with a radius not exceeding 1,33 mm. The
thickness of the sample will prejudice the results obtained.

A minimum of 10 specimens shall be tested. However, it is usual to take a total of
20 specimens for conditioning and testing to cover the eventuality of a failure during the test
of the first set of specimens.
8.6.3 Test apparatus and materials
The following test apparatus and materials shall be used.
a) A draught-free room, test chamber or enclosure which provides a means of venting the
fumes from burning specimens. A hood may be used, but its exhaust fan shall be disabled
during the tests and allowed to operate only between tests in order to clear fumes. Subdued
light is advantageous.
b) The igniting source consisting of a blue flame, (20 ± 2) mm high, produced using a
laboratory burner (Bunsen or Tirril burner) having a tube with a length of 100 mm and an
inside diameter of (9,5 ± 0,5) mm. The tube shall not be equipped with end attachments
such as stabilizers.
– 6 – 61189-2 Amend. 1 © IEC:2000(E)

c) A supply of technical grade methane gas with a suitable regulator and meter to produce a

uniform gas flow. If natural gas is used as an alternative to methane, it should have a heat

content of approximately 37 MJ/m . This has been found to produce similar results.

The required flame shall be obtained by adjusting the gas supply and air inlets of the burner

until a yellow-tipped blue flame of the specified height is produced, and then by increasing

the air supply until the yellow tip has just disappeared. The height of the flame shall then be

measured again and corrected if necessary.

d) A test fixture shall be comprised of a ring stand with two clamps or similar apparatus which

is adjustable for vertical positioning of the specimen. Each specimen is to be held by

clamping the upper 6 mm of the specimen with the long dimension oriented vertically, so

that the lower end of the specimen is 10 mm above the top of the burner tube and 300 mm

above a horizontal layer of dry tissue paper (50 mm × 50 mm swatch). An adjustable,
movable holder maintains the burner tube centrally under the lower end of the specimen to
an angle of 5° and the 10 mm distance between the lower end of the specimen and the top
of the burner is to be maintained during the flame applications.
e) A hand-operated timing device with a resolution of 1 s or better.
8.6.4 Procedure
Ten specimens shall be preconditioned in accordance with the requirements of 5.3 of
IEC 60068-1 for a period of 48 h as a referee and 24 h for normal quality conformance prior to
testing. The detail requirements are
a) a temperature of 15 °C to 35 °C;
b) a humidity of 25 % RH to 75 % RH;
c) an air pressure of 86 kPa to 106 kPa.
Fluctuations shall be kept to a minimum.
The remaining 10 specimens shall be preconditioned in a circulating air oven for 24 h at
(125 ± 2) °C. They shall then be allowed to cool in a desiccator until specimens reach room
temperature prior to testing.
Each specimen shall be held in the test fixture by clamping the upper 6 mm of the specimen
with the long direction oriented vertically so that the lower end of the specimen is 10 mm above
the top of the burner tube and 300 mm above a horizontal layer of dry tissue papers (50 mm ×
50 mm swatch).
The burner, in a remote position from the specimen, shall be adjusted by controlling the gas
supply and air inlets of the burner until a yellow-tipped blue flame (20 ± 2) mm in height is

produced. The air supply is then increased until the yellow tip has disappeared. The height of
the flame shall then be measured again and corrected if necessary.
The burner shall be placed centrally beneath the lower end of the specimen and allowed to
remain for 10 s. The burner shall then be moved at least 150 mm away from the specimen, and
the time taken by the specimen to self-extinguish shall be measured. This shall be defined as
the time from removal of the test flame from the specimen until the time when the specimen
ceases to burn. Record the burn time on the laboratory pro forma in annex C.
When the specimen ceases to burn, the burner shall immediately be replaced in its original
position beneath the specimen. After 10 s, the test flame shall again be withdrawn and the
duration of flaming shall again be measured. Record the burn time on the laboratory pro forma
in annex C.
61189-2 Amend. 1 © IEC:2000(E) – 7 –

If the test flame is extinguished during either application, it shall be reignited immediately and
reapplied so that the total time of application is still 10 s. There shall be no more than three

applications of the test flame during any 10 s ignition period, otherwise the material cannot be

evaluated by this technique.
If the specimen drips molten or flaming material during either application of the test flame, the

burner may be tilted to an angle of up to 45° and also slightly withdrawn from one of the 13 mm

sides of the specimen during the flame application to avoid material dripping into the tube of

the burner.
If the specimen drips molten or flaming material, or is consumed during the test, the burner

shall be hand-held and the 10 mm distance between the bottom of the specimen and the top of
the burner tube shall be maintained throughout the flame application. Any molten strings of
material shall be ignored, and the flame shall be applied to the major part of the specimen.
Record observed dripping or other significant observations on the laboratory pro forma in
annex C.
If the total of the ten burn times meets the requirements of the relevant specification but
individual burning times exceed the relevant requirements, a further set of five specimens shall
be tested. If the second set meets all the requirements, these requirements shall be deemed to
be satisfied.
If the total of ten burning times for any set of five specimens exceed the specified requirements
by no more than 5 s, a second set of five specimens shall be tested, and if the requirements for
total and individual burning times are met, these requirements shall be deemed to be
satisfactory.
8.6.5 Report
In addition to the general requirements for reporting, the report shall include
a) test number and revision;
b) identification of the material tested;
c) testing date;
d) the thickness of the specimen;
e) the duration of flaming of each specimen after the first removal of the test flame;
f) the duration of flaming of each specimen after the second removal of the test flame;
g) whether the specimen burns up to the holding clamp;
h) whether the specimen drips flaming particles which ignite the tissue paper;

i) any deviation from this test method;
j) the name of the person performing the test;
k) the type of combustion. Flaming combustion is the combustion of the specimen in the
gaseous phase with the emission of light. Glowing combustion of the specimen is the
combustion without flame;
l) the evaluated results.
8.6.6 Additional information
Annex C shows a suggested pro forma for reporting.
There are obvious hazards associated with flammability testing. Training of test operators, and
familiarity with laboratory safety procedures is of paramount importance.
All fire effluent should be considered to be toxic, for the purposes of safety i
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