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INDIAN STANDARD - Ammonia Preserved Concentrated Natural Rubber Latex ( Second Revision ) ICS 83.040.70
(Last Updated: 05 Feb 2018)

   INDIAN STANDARD IS 5430 : 2017

Indian Standard
September 2017 Price Group 2
© BIS 2017
 
B U R E A U O F I N D I A N S T A N D A R D S
 
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI-110002
www.bis.org.in www.standardsbis.in
Rubber and Rubber Products Sectional Committee, PCD13
NATIONAL FOREWORD
This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalized
by the Rubber and Rubber Products Sectional Committee had been approved by the Petroleum, Coal and Related
Products Division Council.
This standard was first published in 1969 and revised in 1981. In the first revision, method of expressing alkalinity
and coagulum content was changed; and the requirement for total solids content was removed.
This revision is being carried out to align the standard with ISO 2004 : 2010 ‘Natural rubber latex concentrates,
centrifuged or creamed, ammonia-preserved type — Specification’.
Preserved latex is an alkaline liquid with the rubber particles suspended in a colloidal form in an aqueous phase.
Being the basic material for many of the consumer and industrial products, the quality of latex needs to be controlled
strictly. This standard is intended to provide the plantation industry a guide to produce latex to suit the requirements
of consumers.
This standard contains clause 4.4 which call for agreement between the purchaser and the supplier.
In the formulation of this standard, considerable assistance has been derived from ISO 2004 : 2010 ‘Natural
rubber latex concentrates, centrifuged or creamed, ammonia-preserved type — Specification’ published by
International Organization for Standardization.
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 with IS 2 : 1960
Rules for rounding off numerical value (revised). The number of significant places retained in the rounded off
value should be the same as that of the specified value in this standard.
1
IS 5430 : 2017
Indian Standard
AMMONIA PRESERVED CONCENTRATED NATURAL
RUBBER LATEX
(Second Revision)
1 SCOPE
This standard prescribes the requirements for
concentrated natural rubber latices, concentrated by
centrifugal process.
2 REFERENCES
The following standards contain provisions, which
through reference in this test, constitute provisions of
the standard. At the time of publication, the edition
indicated were valid. All standards are subject to
revision and parties to agreements based on this
standard are encouraged to investigate the possibility
of applying the most recent editions of the standards
indicated below.
IS No. Title
3708 Methods of test for natural rubber
latex:
(Part 1) : 1985 Determination of dry rubber
content (NRL:1) (first revision)
(Part 2) : 2001 Determination of sludge content
(NRL:5) (first revision)
(Part 4) : 2008/ Determination of total alkalinity
ISO 125 : 2003 (NRL:7) (first revision)
(Part 5) : 2005/ Determination of KOH number
ISO 127 : 1995 (second revision)
(Part 6) : 1985 Determination of mechanical
stability (NRL:9) (first revision)
(Part 7) : 2005/ Determination of volatile fatty acid
ISO 506 : 1992 number (second revision)
(Part 11) : 2001 Determination of magnesium
(Direct Titration Method)
(NRL:18) (second revision)
4905 : 2015 Random Sampling and
Randomization Procedures (first
revision)
5190 : 1993 Code of packaging natural rubber
latex in drums
9316 Methods of test for rubber latex :
(Part 3) : 1988 Determination of coagulum
content (Sieve Residue (RL:3)
(first revision)
(Part 4) : 1988 Determination of total solids
content (RL:4) (first revision)
(Part 5) : 1988 Drawing of samples (RL:5) (first
revision)
IS No. Title
(Part 7) : 1987 Determination of total copper
(RL:7)
(Part 9) : 1987 Determination of total manganese
(RL:9)
3 TYPES
This standard covers three types of concentrated natural
rubber latices as follows:
a) Type HA — Centrifuged natural rubber latex
preserved with ammonia only with an
alkalinity of at least 0.6 percent.
b) Type MA — Centrifuged natural rubber latex
preserved with ammonia and other
preservatives as agreed to between the
purchaser and the supplier with an alkalinity
above 0.3 percent but less than 0.6 percent.
c) Type LA — Centrifuged natural rubber latex
preserved with ammonia and other
preservatives as agreed to between the
purchaser and the supplier with an alkalinity
of not more than 0.3 percent.
4 REQUIREMENTS
4.1 Colour
The colour of all types of latex, when visually examined,
shall not be pronounced blue or grey.
4.2 Odour
For all types of latex there shall not be any pronounced
odour of putrefaction after neutralization with boric
acid.
4.3 The latex shall conform to the requirements
prescribed in Table 1.
4.4 Optional Requirements
The limit of magnesium content when determined in
accordance with the method prescribed in IS 3708
(Part 11) shall be as agreed to between the purchaser
and the supplier.
5 SCALE OF SAMPLING AND CRITERIA FOR
CONFORMITY
5.1 The method of drawing representative samples of
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IS 5430 : 2017
the material and criteria for conformity shall be as
prescribed in Annex A.
6 PACKING AND MARKING
6.1 Packing
The latex shall be packed in mild steel drums with
internal bituminous coating having capacity 210 ± 5
litres. Polyethylene or epoxy lined mild steel drums or
flexi bags capable of holding 22.0 ± 0.5 MT or any
other bulk container may also be used for packaging,
if specifically required by the consumer on mutually
acceptable terms (see IS 5190).
6.2 Marking
The containers shall be marked with the following:
Table 1 Requirements for Concentrated and Preserved Natural Rubber Latices
(Clause 4.3)
Requirement
Sl
No.
Characteristics
Type HA Type MA Type LA
Method of Test, Ref to
(1) (2) (3) (4) (5) (6)
i) Dry rubber content, percent by mass, Min 60.0 60.0 60.0 IS 3708 (Part 1)
ii) Non-rubber solids1), percent by mass, Max 1.8 1.8 1.8 —
iii) Coagulum content, percent by mass of
latex, Max
0.03 0.03 0.03 IS 9316 (Part 3)
iv) Sludge content, percent by mass, Max 0.05 0.05 0.05 IS 3708 (Part 2)
v) Alkalinity as ammonia, percent by mass
of latex
0.6 Min Above 0.3
but below 0.6
0.3 Max IS 3708 (Part 4)/ISO 125
vi) KOH number, Max 0.8 0.8 0.8 IS 3708 (Part 5)/ISO 127
vii) Mechanical stability 2) s, Min3) 650 650 650 IS 3708 (Part 6)
viii) Volatile fatty acid number, Max3) 0.10 0.10 0.10 IS 3708 (Part 7)/ISO 506
ix) Copper content, ppm of total solids, Max 8 8 8 IS 9316 (Part 7)
x) Manganese content, ppm of total solids,
Max
8 8 8 IS 9316 (Part 9)
1) Difference between total solids content and dry rubber content. Total solids content may be determined in accordance with IS 9316
(Part 4).
2) Test for mechanical stability shall be carried out at least 20 days of the packing of rubber latex.
3) Or as agreed to between the purchaser and the supplier.
a) Name of the producer or trademark, if any;
b) Type of latex;
c) Net and gross mass, in kg;
d) Dry rubber content (DRC); and
e) Date of packing.
6.3 The containers may also be marked with the
Standard Mark.
The use of the Standard Mark is governed by the
provisions of the Bureau of Indian Standards Act, 1986
and the Rules and Regulations made thereunder. The
details of conditions under which the licence for the
use of the Standard Mark may be granted to
manufacturers or producers may be obtained from the
Bureau of Indian Standards.
3
IS 5430 : 2017
ANNEX A
(Clause 5.1)
SCALE OF SAMPLING AND CRITERIA FOR CONFORMITY
A-1 TANK SUPPLIES
A-1.1 When the material is supplied in tanks or other
bulk containers, each tank or bulk container shall be
sampled separately.
A-1.2 A representative sample shall be drawn from each
tank or bulk container according to 5 of IS 9316
(Part 5).
A-1.3 The sample shall be tested for all the requirements
given in 4. The material in tank or bulk container shall
be considered as conforming to this specification if the
corresponding representative sample satisfies all the
requirements given in this standard.
A-2 DRUM SUPPLIES
A-2.1 Lot
In a single consignment, all the drums of the same size,
same type and belonging to the same batch of
manufacture shall constitute a lot.
A-2.2 For ascertaining the conformity of material to
the requirements of this standard, samples shall be
tested from each lot separately.
A-2.3 The number of drums (n) to be selected for
sampling shall depend on size of the lot (N) and shall
be in accordance with col 1 and 2 of Table 2.
Table 2 Scale of Sampling
Lot Size
N
No. of Drums to
be Selected
n
(1) (2)
Up to 25 3
26 to 50 5
51 to 100 7
101 and above 10
A-2.4 These drums shall be chosen at random from the
lot. In order to ensure the randomness of selection,
reference may be made to IS 4905. In case this standard
is not readily available, the following procedure may
be adopted:
Starting from any drum in the lot, count them as 1, 2,
3...... up to r and so on in one order, where r is the
integral part of N/n. Every rth drum thus counted shall
be selected to constitute the required sample size.
A-3 METHOD FOR TAKING SAMPLES FROM
SELECTED DRUMS
A-3.1 From each of the drums selected according to
A-2.3 and A-2.4, a representative sample shall be drawn
in accordance with the procedure prescribed in 5 of
IS 9316 (Part 5).
A-4 TEST SAMPLE AND REFEREE SAMPLE
A-4.1 From the samples (A-3.1) representing different
drums in the lot, a small but approximately equal
quantity of material shall be taken and mixed thoroughly
to form a composite sample, not less than 1 800 g.The
composite sample so obtained shall be divided into
three equal parts, one for the purchaser, another for the
supplier and the third for the referee.
A-4.2 The remaining portions of the material in the
samples (A-3.1) shall be divided into three equal parts,
each forming an individual sample. One set of
individual samples representing the drums selected (n)
shall be for the purchaser, another for the supplier and
the third for the referee.
A-4.3 All the individual and composite samples shall
be transferred to separate containers. Each container
shall then be sealed air-tight with stoppers and marked
with full details of sampling, the date of sampling,
month and year of manufacture, batch or code number
and other important particulars of the consignment.
A-4.4 The referee sample consisting of a composite
sample and a set of individual samples shall bear the
seals of both the purchaser and the supplier and shall
be kept at a place agreed to between the two. This shall
be used in case of any dispute between the two.
A-5 NUMBER OF TESTS
A-5.1 Tests for determination of dry rubber content,
alkalinity as ammonia, volatile fatty acid number and
mechanical stability shall be conducted on each of the
individual samples.
A-5.2 Tests for the remaining characteristics shall be
carried out on the composite sample.
A-6 CRITERIA FOR CONFORMITY
A-6.1 The lot shall be declared as conforming to the
requirements of the specification if A-6.1.1 and A-6.1.2
are satisfied.
A-6.1.1 For characteristics tested on individual samples
(see A-5.1), all the test results on each of the individual
samples shall satisfy the corresponding requirements
given in Table 1.
A-6.1.2 For the remaining characteristics given under
4, all the test results on composite sample shall meet
the corresponding requirements specified in 4.
 
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‘BIS Catalogue’ and ‘Standards : Monthly Additions’.
This Indian Standard has been developed from Doc No.: PCD 13 (2636).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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