IS 216: Coal tar pitch

2006·1.1 MB·English

by  Bureau of Indian Standards

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IS 216 (2006): Coal tar pitch [PCD 6: Bitumen Tar and their
Products]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
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IS 216:2006
Wwikltill* (Reaffirmed - 2011)
wh-mrl?fh-fmli&
Indian Standard
COAL TAR PITCH — SPECIFICATION
(Second Revision)
Ics 75.140

0 BIS 2006

BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
July 2006 Price Group 2
.— — ----
Bitumen, Tar and Their Products Sectional Committee, PCD 6
FOREWORD
This Indian Standard (Second Revision) was adopted bythe Bureau of Indian Standards, after the draft finalized
by the Bitumen, Tar and Their Products Sectional Committee had been approved by the Petroleum, Coal and
Related Products Division Council.
Coal tar pitch serves as a valuable ingredient in the production of a number of waterproofing, protective and
binding compounds employed inmasonry, steelandtimber structures. Itisalsoused forwaterproofing concrete
structures, caulking of decks, asasriturantfor roofing felts, as-abinder for avariety ofcarbon products and coal
briquettes, for damp-proof courses, flooring mastics and as a base for coal tar paints. Coal tar pitch to this
specification isnot suitable for formulation of quick-drying black enamels nor for road construction, for which
purposes IS215 :1995 ‘Road tar (third revision)’ should be referred to.
Considering the importance of the subject, this standard was frostpublished in 1951and subsequently revised in
1961.Further revision wasnecessitated toincorporate specialcoaltar pitchgrades andtomodify$he requirements
of coal tar pitch of various grades prescribed inthe existing version.
In this revision, the following modifications have been made:
a) Scope has been modified to incorporate the requirements of special coal tar pitch grades.
b) Requirements for various grades of coal tar pitch have been modified.
c) Requirements for special coal tar pitch of threegrades have been incorporated.
For the purpose of deciding whether aparticular requirement ofthis standard iscomplied with, the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with
IS2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained inthe

rounded off value should be the same asthat ofthe specified value inthis standard.

(Continued from second coverj
‘IS 216:2006
Indian Standard
COAL TAR PITCH — SPECIFICATION
(Second Revision )
1 SCOPE IS No. Title
This standard covers the requirements, methods of 4542:1968 Calorimetric methods for
sampling and test for the range of four grades of determination of iron
coal tar pitch from soft to hard consistencies with 9497:1980 Method for determination of
softening points varying from 45°to 95°C and forthe sodium and potassium (flame
range of three grades of special coal tar pitch from photometric)
binder to extra hard consistencies with softening
13320:1992 Determination of iron by atomic
points varying from 86° to 130°C intended for the
rtbsoption spectrophotometry —
production of water proofing protective and binding
Test method
compounds employed in masonry, steel, timber and
concrete structures and also for the preparation of 13758 Coal tar pitch; Methods of test
roofing felts, besides their use as binder in the (Part 1):1993 Determination ofmatter insoluble in
production of a variety of carbon products such as quinoline
graphite electrodes, Soderberg or pre-baked anodes
(Part 2): 1993 Determination of coking value
and carbon or graphite *locks.
3 TERMINOLOGY
2 REFERENCES
Forthe purpose ofthis standard, the definitions given
The following standards contain provision which,
inIS 334 shall apply.
through reference in this text, constitute provisions
ofthisstandard. Atthetime ofpublication, the.editions
4 GRADES
indicated were valid. All standards are subject to
revision and parties to agreements based on this 4.1 Coal Tar Pitch
standard are encouraged to investigate the possibility
The coaltarpitch shallbeclassified intothe following
of applying the mostrecent editions of the standards
four grades:
indicated below:
a) Soft pitch,
IS No. Title
b) Soft medium pitch,
334:2002 Glossary of t e rms relating to
c) Hard medium pitch, and
bitumen and tar (th ir$ revision)
d) Hard pitch.
1201: 19781) Methods for testing tar and
bituminous materials Sampling 4.2 Special Coal Tar Pitch
~rst revision)
The special coal tar pitch shall be classified into the
1202: 1978’) Determination of specific gravity
following three grades:
(first revision)
a) Binder pitch,
1205: 19781) Determination of softening point
~rst revision) b) Hard pitch, and
1215:1978’1 Determination ofmatter insoluble in c) Super hard pitch.
toluene ~rst revision)
5 REQUIREMENTS
1217: 19781) Determination of mineral matter
(Ash) (@t revision) 5.1 Composition
1220: 19781) Determination of volatile matter
The material shall be:
content @rst revision)
a) either the residue of the direct distillation of
1350(Part 3) Methods of test for coal and coke:
crude tar produced by the high temperature
1969 Part 3 Determination of sulphur
carbonization of coal in coke ovens or retorts,
(j%strevision)
or
4284:1967 Method for volumetric determi-
nation of iron b) obtained “byfluxing back such pitch residues
with high boiling coal tar distillates to give
l)ES1201:1978toIS1220: 1978printedinonevolume. products of the desired softening point.
1
—-——.————.—._—-——.,
IS 216:2006
5.2 The material shall also comply with the 6.5 Criteria for Conformity
requirements, given inTable 1andTable2whentested
6.5.1 The lotshallbe considered asconforming to the
according to test methods as indicated in respective
requirements of this standard, if the conditions
columns.
mentioned in 6.5.2 and 6.5.3 are satisfied.
6 SAMPLING AND CRITERIA FOR
6.5.2 From thetestresults ofsoftening point the mean
CONFORMITY
(~) and the (R) shaIl be calculated. The following
6.1 Lot conditions shall be satisfied:
a) (~– 0.6R)shallbegreater than orequal tothe
Inanyconsignment, allthecontainers ofcoaltarpitch
minimum specification limit, and
of the same grade and from the same batch of
manufacture shall‘begrouped together to constitute a b) (~ + 0.6 R ) shall be less than or equal to the
lot. ‘mm”imumspecification limit.
6.2 Thenumber ofcontainers tobeselectedatrandom 6.5.3 The composite sample when tested for the
from the lot shall depend upon the size of the lot and characteristics mentioned in 6.4.2 shall satisfy the
shall be in accordance with Table 3. corresponding requirements of the characteristics.
6.3 From each of the containers selected as in 6.2 an 7 PACK-ING AND MARKING
average sample representative of the material in the
7.1 Packing
container shall be drawn in accordance with the
methods prescribed in IS 1201, taking all the
The material shall be suitably packed in a container
precautions mentioned therein. All these samples
as agreed to between the supplier and the purchaser.
from the individual containers shall be stored
‘separately. 7.2 Marking
6.4 Number of Tests 7.2.1 Each container shall be legibly and indelibly
marked with the following:
6.4.1 All the individual samples shall be tested for
softening point. a) Manufacturer’s name and trade-mark, if any;
6.4.2 For the remaining characteristics, a composite b) .Grade;
sample prepared by mixing together equal quantities
c) Batch number, code number, etc; and
of coaltar pitch from allthe individual samples shall
be tested, d) .Dateof manufacture.

Table 1 Requirements for Coal Tar Pitch

(C/ause 5.2)
S1No. Characteristic Requirement Method ofTest,
Refto
/ \
SoftPitch Sotl Hard Hard
Medium Medium Pitch
Pitch Pkch
(1) (2) (3) (4) (5) (6) (7)
O Softeningpoint(Ringand 45-55 56-75 76-85 86-95 IS1205
Ballmethod),“C
ii) Specificgravityat25°C 1.20-1.30 1.22-1.32 1.24-1.32 1.26-1.32 Is 1202
iii) Volatilemattercontent, 75 65 60 50 IS1220
percentbymass,MUX
iv) Matterinsolubleintoluene(free 25 25 30 35 IS1215
carbon),percentbymass,Ma

v) Ash,percentbymass,Max 0.5 0.5 0.75 0.8 IS1217
2
IS 2-16:2006
Table 2 Requirements for Special Coal Tar Pitch
(Clause 5.2)
S1No. Characteristic Requirements forGrades Method ofTest,
Refto
/ \
BinderPitch ExtraHard SuperHard
Pitch Pitch
(1) (2) (3) (4) (5) (6)
i) Softeningpoint(RingandBallmethod),“C g6-105 106-115 116-130 1S1205
ii) Specificgravityat25°C >1.28 <1.30 >1.30 Is 1202
iii) Cokingvalue[byConardsonCarbonMethod], 54 56 58 IS13758(Part2)
percentbymass,A&r
iv) MatterinsolubleintohsenebyG4, 30 1S1215
percentbymass,Mits
v) Matterinsolubleinquinoline, 12 15 Is 13758(Part1)
percentbymass,Max
vi) Betaresincorrten~percent,Min 20 25 20 v
vii) Ash,percentbymass,Max 0.5 IS 1217
viii) Iron(asFe),percent,Mm 0.05 — IS4284,IS4542,and
IS13320
ix) Silicon(asSi),percen~Max 0.02 AnnexA
@ Sodium(Na),ppm,J& 200 Is 9497
xi) Sulphur(S),percent,Max 0.50 Is 1350(Part3)
1)The ~lfference be~een Medetermined v~ues ofmatter insolubleintoluene [seeS1No. (iv)]andmatserinsoluble inqUinOliSlt3
[seeS1No.(v)]shallbereportedasbetaresincontent.
7.2.2 EMSCertij7cation MarWing Table 3 Number of Containers to be Selected

The containers may also be mar ked with the (Clause 6.2)
Standard Mark. S1No. LotSize No.ofContainers
7.2.2,1 The use of the Standard Mark is governed (1) (2) (3)
by the provisions of Bureau of Indian Standards
Act, 1986 and the Rules and Regulations made i) upto50 2
thereunder. The details of conditions under which ii) 51to 100 3
the licence for the use of the Standard Mark may Kl) 101to200 4
be granted to manufacturers or producers may iv) 201to300 5
be obtained from the Bureau of Indian v) 301to500 7
Standards. vi) 501andabove 10
.
IS 216:2006
ANNEX A
[Table 2, S1No. (ix)]
DETERMINATION OF SILICON (Si) BY MOLYBDENUM BLUE METHOD
(CALORIMETRIC METHOD)
A-1 PRINCIPLE then reduced with stannous chloride to form a deep
bluesuspension. Theoptical absorption ofthesolutioh
Thismethod issuitable forthedetermination ofsilicon
ismeasured at 765 nm using a spectrophotometer.
in the range 0.2 to 10 ppm and is also free from
interference from other ions usually present in these A-4.1 Calibration Curve
materials.
Take 1,3,5,7and 10ml of silicon working solution,
The coal-tar pitch will be ashed as per the standard in 100-mlvolumetric flasks andadd5drops ofH2SOd
procddure. (1 :3) toeach flaskanddilutpto 10ml, Add 2.5 ml of
ammonium molybdate solutiontoeachflaskandallow
A-2 REAGENTS tostandfor 5min. Then add 5mlofHzSO,(1 :3)mix
well followed by the addition of 5 drops of SnClz
A-2.1 Ammonium Molybdate (50g/litre) —Dissolve
solution and make up to 100 ml. Measure the
50 g of ammonium molybdate (NH,),M0,02,.4H20
absorbance at 765 nm after 5 min and plot the
in water and dilute to one litre.
absorbance volumes againstthemicrograms ofsilicon.
A-2.2 Hydrochloric Acid (HCI) [1:1] — Equal The blue colour isstable only up to 12h.
volume of HC1(sp. gr. 1.19)and water.
A-4.2 Method for Pitch
A-2.3 Silicon Standard Solution (1 ml = 1 mg of
The pitch to be analyzed for silicon content is ashed
Si) — Dissolve 10.1 g of sodium silicate (Na,SiO~.
using thestandard procedure.
9H20) in water and make to one litre in a volumetric
flask and store in polyethylene bottle. Fuse gently weighed quantity of the ash with sodium
carbonate (around 6g) ina platinum crucible over a
A-2.4 Silicon Working Solution (1 ml= 0.01 mg of
Bunsen burner. When thefusion iscomplete remove
Si)— Dilute 10ml ofthe standard silicon solution to
the crucible from the burner, swirl to distribute the
one litre in a volumetric flask.
melt onthe sidesofthe crucible and coolthe crucible.
A-2.5 Stannous Chloride Solution — Dissolve 2.5 g The crucible iskept in a250-ml beaker and 25 ml of
of stannous chloride (SnClz.2HzO) in 5 ml of water added. Cover the beaker with awatch glass and
concentrated HCI and dilute to 250 ml. Stable up to add cautiously HC1(1:1) to decompose the melt. Boil
two weeks. the solution for several minutes and cool. Transfer to
a 10O-m-lvolumetric flask and dilute to volume.

A-2.6 Sodium Carbonate Solution (100 g/litre) — Transfer asuitable aliquot of this solution to 100-ml

Dissolve 100 g of NazCOJ in water and dilute to volumetric flask, adjust thepH to 6-8 with Na2COJ
one litre. solution and determine the silicon calorimetrically as
explained in the procedure for the calibration graph
A-2.7 Sulplruric Acid (1:3) — Carefully mix one
in A-4.1 above.
volume of concentrated sulphuric acid with three
volumes of water. Find the microgram of~ilicon m the sample solution
from the calibration curve.
A-3 APPARATUS
A-5 CALCULATION
A-3.1 Spectrophotometer, visible.
Silicon, ppm = (AXB)/W
A-4 PROCEDURE
where
The ashed sample isfused with sodium carbonate and
A= microgram ofsiliconper 100mlofthe solution
subsequently dissolved in 6 N hydrochloric acid. An
found inthe aliquot used,
aliquot of the solution is diluted ~o suitable
concentration and the pH is adjusted to the values 13= aliquot factor (original volume divided by
between 6-8. Silicomolibydic acid is formed by the aliquot taken for analysis), and
addition of ammonium molybdate solution, which is W= original weight of the sample.

4
..——.—
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Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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