Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 15893 (2011): Jewellery - Alloy Coatings [MTD 10: Precious Metals]
Transcript
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 15893 (2011): Jewellery - Alloy Coatings [MTD 10:Precious Metals]
B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
October 2010 Price Group 2
Precious Metals Sectional Committee, MTD 10
NATIONAL FOREWORD
This Indian Standard which is identical with ISO 10713 : 1992 ‘Jewellery — Gold alloy coatings’ issued by theInternational Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on therecommendation of the Precious Metals Sectional Committee and approval of the Metallurgical EngineeringDivision Council.
The text of ISO Standard has been approved as suitable for publication as an Indian Standard withoutdeviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention isparticularly drawn to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as‘Indian Standard’.
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is touse a point (.) as the decimal marker.
In this adopted standard, reference appears to certain International Standards for which Indian Standardsalso exist. The corresponding Indian Standards which are to be substituted in their respective places arelisted below along with their degree of equivalence for the editions indicated:
The technical committee has reviewed the provisions of the following International Standard referred in thisadopted standard and has decided that it is acceptable for use in conjunction with this standard:
International Standard Title
ISO 9220 : 1988 Metallic coatings — Measurement of coating thickness — Scanning electronmicroscope method
For the purpose of deciding whether a particular requirement of this standard is complied with the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2 : 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained inthe rounded off value should be the same as that of the specified value in this standard.
International Standard
ISO 3160-2 : 1982 Watch cases andaccessories — Gold alloy coverings— Part 2: Determination of fineness,thickness and corrosion resistance
ISO 3497 : 1990 Metallic coatings —Measurement of coating thickness —X-ray spectrometric methods
ISO 3543 : 1981 Metallic and non-metallic coatings — Measurement ofthickness — Beta backscatter method
Corresponding Indian Standard
IS 12114 (Part 2) : 1987 Specificationfor gold alloy coverings on watch casesand their accessories: Part 2Determination of fineness, thicknessand corrosion resistance
IS 12860 : 1989 Metallic coatingthickness by X-ray fluorescencetechnique method — Determination
IS 14149 : 1994 Metallic and non-metallic coatings — Measurement ofthickness — Beta backscatter method
Degree of Equivalence
Technically Equivalent
do
Identical
INTERNATIONAL STANDARD
Jewellery
1 Scope
This International Standard specifies the coating thickness requirements and the gold fineness of the coating. It also defines current terms concerning gold alloy coatings.
It is not applicable to watch bracelets if they are per- manently attached to the case.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publica- tion, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards.
IS0 3160-2:1982, Watch cases and accessories - Gold alloy coverings - Part 2: Determination of fineness, thickness and corrosion resistance.
IS0 3543:1981, Metallic and non-metallic coatings - Measurement of thickness - Beta backscatter method.
IS0 9220:1988, Metallic coatings - Measurement of coating thickness - Scanning electron microscope method.
3 Coating thickness requirements and relevant terms
Jewellery with a gold alloy coating may be designated by the terms given in table 1 only if the thickness of the coating is in accordance with the values indicated in this table.
NOTE 1 This coating requirement may also be defined by the fine gold content related to the total mass of the ar- ticle. The fine gold content defined in this way is custom- arily indicated in the jewellery trade in “millieme”. In this case, the conformity of the coating with the requirements has to be calculated using the mass of the article, the value expressed in millieme, the surface area and the density of fine gold. However, to conform with this International Standard, the coating, defined in millieme, has to be at least equivalent to the thickness indicated in table 1.
4 Measurement of coating thickness
The thickness measurement is not related to any particular part of a plated article, but to the overall quantity of fine gold necessary to produce the re- quired thickness over the total surface area of the ar- ticle.
4.1 Basic method (destructive method)
For arbitration, the dissolution method and chemical analysis shall be used. The average thickness has to be calculated using the fine gold content, the density of fine gold and the surface area.
For details of the dissolution method and chemical analysis see IS0 3160-2.
4.2 Secondary methods (non-destructive methods)
On agreement between the manufacturer and pur- chaser, the following methods may be used:
a) beta backscatter method according to IS0 3543;
b) X-ray spectrometric method according to IS0 3497;
c) scanning electron microscope method according to IS0 9220.
NOTE 2 These non-destructive methods are recom- mended for manufacturing control and continuous quality control. However, only local thicknesses can be determined. Therefore, the number of measurements and the position
JEWELLERY — GOLD ALLOY COATINGS
Indian Standard
ISO 10713 : 1992
IS 15893 : 2010
of the measuremen points have to be agreed upon by the manufacturer and purchaser.
Other test methods may be used, if it can be dem- onstrated that they are as good as, or better than, the methods described in this International Standard.
5 Marking
5.1 Articles in accordance with the requirements and designated by the terms given in table 1 may be marked as
L . . for coatings applied by a mechanical process;
P: for coatings applied by any other process.
The relevant category, according to the letter given in table 1 may be added.
EXAMPLE
P - B: for coatings with a minimum thickness of 3 pm, applied by a galvanic process, with a fineness of at least 585/l 000.
5.2 If there is any marking on the article, it shall comprise the maker’s mark or the mark of responsi- bi lity.
5.3 It is not permitted to mark or stamp articles which are only gilt.
5.4 The fine gold content or the values in parts per thousand of any coating may not be marked on any article.
IS 15893 : 2010
ISO 10713 : 1992
Term
s C
oatin
g M
anuf
actu
ring
Fine
ness
En
glis
h Fr
ench
G
erm
an
proc
ess
Cat
egor
y Th
ickn
ess
(min
.)
Fine
gol
d’)
Gol
d al
loy
min
.
Rol
led
gold
Pl
aque
or
(Ia
min
e)
Gol
ddou
ble
A 5
pm m
in.
1 37
5/I
000
Dou
ble
or (
lam
ine)
W
alzg
oldd
oubl
e M
echa
nica
l B
3 pm
m
in.
C
0,5
pm m
in.
1)
Gol
d pl
ated
Pl
aque
or
G
oldd
oubl
e A
5 pm
m
in.
9 58
5/l
000
Dou
ble
or
Gol
dpla
ttier
t An
y ot
her
B 3
pm
min
.
C
0,5
pm
min
. 1)
Gilt
D
ot-e
Ve
rgol
det
Any
othe
r <
0,5
pm
585/
I 00
0
1)
The
qual
ity
of t
his
coat
ing
is d
efin
ed
in f
ine
gold
, ev
en t
houg
h th
e co
atin
g co
nsis
ts
of g
old
allo
y. T
here
fore
, th
e ac
tual
th
ickn
ess
of t
he
appl
ied
gold
al
loy
coat
ing
will
vary
ac
cord
ing
to t
he
allo
y us
ed
as f
ollo
ws:
Gol
d al
loy
375/
I 00
0 =
2,3
pm
Gol
d al
loy
417/
I 00
0 =
I,9
pm
Gol
d al
loy
585/
l 00
0 =
I,2
pm
Gol
d al
loy
667/
I 00
0 =
I,0
pm
Gol
d al
loy
750/
I 00
0 =
0,83
5 pm
Gol
d al
loy
1 00
0/l
000
= 0,
5 pm
The
actu
al
thic
knes
ses
of t
he
gold
al
loy
coat
ings
in
dica
ted
abov
e co
rresp
ond
to a
thic
knes
s of
0,5
pm
of
fine
gold
.
NO
TE -
Th
e va
lues
of
cat
egor
y C
, re
ferri
ng
to f
ine
gold
, ar
e su
pplie
d di
rect
ly
by t
he
test
m
etho
d re
com
men
ded
in 4
.2.
IS 15893 : 2010
3
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification ofgoods and attending to connected matters in the country.
Copyright
BIS has the copyright of all its publications. No part of the these publications may be reproduced inany form without the prior permission in writing of BIS. This does not preclude the free use, in thecourse of implementing the standard, of necessary details, such as symbols and sizes, type or gradedesignations. Enquiries relating to copyright be addressed to the Director (Publications), BIS.
Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards arealso reviewed periodically; a standard alongwith amendments is reaffirmed when such review indicatesthat no changes are needed; if the review indicates that changes are needed, it is taken up for revision.Users of Indian Standards should ascertain that they are in possession of the latest amendments oredition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards: Monthly Additions’.
This Indian Standard has been developed from Doc No.: MTD 10 (4887).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
BUREAU OF INDIAN STANDARDS
Headquarters:
Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002Telephones: 2323 0131, 2323 3375, 2323 9402 Website: www.bis.org.in
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