इंटरनेट
मानक
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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.
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“प0रा1 को छोड न' 5 तरफ”
“The Right to Information, The Right to Live”
“Step Out From the Old to the New”
Mazdoor Kisan Shakti Sangathan
Jawaharlal Nehru
IS 9570 (1980): Classification of flammable gases or
vapours with air according to their maximum experimental
safe gaps and minimum igniting currents [ETD 22: Electrical
Apparatus for Explosive Atmosphere]
“!ान $ एक न' भारत का +नम-ण”
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“Invent a New India Using Knowledge”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”
है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
IS : 9570 - 1980
Reaffirmed 1996 )
( (Reaffirmed
2001 )
Indian Standard
CLASSIFICATION
OF FLAMMABLE
GASES
OR VAPOURS WITH AIR ACCORDING TO THEIR
MAXIMUM EXPERIMENTAL
SAFE GAPS AND
MINIMUM IGNITING CURRENTS
( First Reprint
DECEMBER
LJDC 621.31-213.34
0 Copyright
BUREAU
MANAK
Gr 4
OF
BHAVAN,
INDIAN
1997 )
: 614.87
1980
STANDARDS
9 BAHADUR
SHAH
NEW DELHI
110002
ZAFAR
MARG
December
1980
IS : 9570 - 1980
hdian Standard
CLASSIFICATION
OF FLAMMABLE
GASES
OR VAPOURS WITH AIR ACCORDING TO THEIR
MAXIMUM EXPERIMENTAL SAFE GAPS AND
MINIMUM IGNITING CURRENTS
Electrical
Xpparatus
for
Explosive
Atmospheres
ETDC 22
Choirman
Central
DR G. S. B.IDAYI
Members
SI~RIMAHESH CHANDRA
Dr G. N. Badami)
S1IRI.J.
H. BIIOJWANI
SHRI S. B. c. ibAR1VAL
Building
Sectional
Representing
Research
Institute,
Committee,
Roorkee
(Alternute to
Bharat Heavy Elcctricals
Ltd, Hyderabad
($ltendP)
SIiRI
s. C. GOELLA
(Al&,&)
SHRI S. K. BIS~VAS(GUPTA)
SIIRI9. K. SEN (.~kentate)
SHRI B. .\. C:IETTY
Directorate
General of Mines Safety, Dhanbad
Electronics Commission, New Delhi
SHRI S. G. DESHYUKII
Bharat Bijlee Ltd, Bombay
SHRI P. N.~ASZ~TKAR (Alternate)
DIRECTOR (COMMERCIAL)
Central Electricity Authority, Ministry of Energy
(Department of Power)
DEPUTY DIRECTOR (Alternate)
SHKI S. N. GHOSH
The Association of Mining, Electrical & Mechanical Engineers,
UK,
Indian
Sub-branch,
Calcutta
Siemens India Ltd, Bombay
SHRI S. N. GHOSH
SHRI D. P. GUPTA
Directorate
General of Technical
Development,
New Delhi
SFIRIP. K. CIIAKRABORTY
Indian Oil Corporation Ltd (Refineries Division),
New Delhi
SHRI S. KANUNGO (Alternate)
Indian Drugs and Pharmaceuticals Ltd, New Delhi
SHRI PI. K. HALDER
SHRI K. B. GUGLANI (Alternate)
Directorate of Standardization, Ministry of Defence
DR HARIHAR SINGH
(DGI)
SHRI S.KRISHNAMURTIIY
Food Corporation of India, New Delhi
(Continued on page 2)
Q Copyright 1980
BUREAU
This publication
OF
INDIAN
STANDARDS
is protected under the Indian Copyright Act (XIV of 1957) and
in whole or in part by any means except with written permission of the
nublisher shall be deemed to be an infringement of cooyrkht under the said Act.
reproduction
Is : 9570 -
1980
(Continwdfrom
jmge 1)
Representing
Members
SHRI T. R. A. KR[SHNAN
SHRI I. M. KHUSHU(Alternate)
SHRI P. V. S. KR~~HNAN
SHRI SURE~HKUMAR (Alternate)
SHRI T. S. KUMAR
SHRI S. K. RAY (Alternate)
SHRI H. N. GUPTA
Tariff Advisory Committee, Bombay
The
Fertilizer (Planning
Ltd, Sindri
& Development)
Central Mining Research Station (CSIR),
India
Dhanbad
Directorate General Factory Advice Service and
Labour Institutes. Bombay
SHRI G. VAWYANATHAN(Alternates
Chief Controllerate of Explosives, Nagpur
SHRI I. N. MURT~
SHR~CHARANJITLAL (Alternate)
Loss Prevention Association of India Ltd, Bombay
SHRI T. NITYANANDAS.
Hindustan Brown Boveri Ltd, Bombay
DR M. S. PADBWRI
SHRI Y. D. DO~AJ (Alternate)
Directorate of Standardization,
Department of
SHRI M. A. J. PARTHASARATHY
Defence Production,
Ministry of Defence
(Engineer-in-Chief)
mu T. R. GULATI (Alternate)
Kiloskar Electric Co Ltd, Bangalore
S~nr S. G. RAMACHANDRA
Sssm T. V. VIDYARATHNARAJ (Alternate)
Larsen & Toubro Ltd, Bombay
SHRI B. RAMACHANDRAN
SW I. C. JOSEPH(Alternate)
Macneill & Magor Ltd, Calcutta
SHRI K. K. RAY
SHRIs. cHANDIu (Alternate)
NGEF Ltd. Bangalore
SHRI.A. N. SIWATHSA
SHRI S. L. SRJDELU~AMURTHY
(Alternate)
Coal India Ltd, Ranchi
SHRI M. B. TAWADEY
SHIU A. S. R. MURTHY (Alternate)
Engineers
India Ltd, New Delhi
SHRI G. N. THADANI
’
Ssnu S. I<AsTNuRIRANCAN
(Altcmate)
Explosives Safety Group, Directorate of Armaments,
DR K. S. UPPAL
Ministry of Defence (R&D)
SHRI R. SRINIVASAN
(Alternate)
Director General, IS1 (Ex-ofiio Member)
SW S. P. SACHDEV,
Director (Elec tech)
Secretary
SHY R. K. MONGA
Deputy Director (Elec tech), IS1
2
IS : 9570 - 1980
Indian Standard
CLASSIFICATION
OF FLAMMABLE
GASES
OR VAPOURS WITH AIR ACCORDING TO THEIR
MAXIMUM EXPERIMENTAL SAFE GAPS AND
MINIMUM IGNITING CURRENTS
0.
FOREWORD
0.1 This Indian Standard was adopted by the Indian Standards Institution
on 30 July 1980, after the draft finalized by the Electrical Apparatus for
Explosive Atmospheres Sectional Committee had been approved by the
Electrotechnical Division Council.
0.2 Electrical apparatus may have to be used in areas or enclosed spaces
where, depending on local and operational conditions, gases, vapours OF
dusts forming an explosive mixture with air, are likely to occur in sufficient
Th e precautions to be taken against
quantity to constitute a hazard.
explosion are prescribed by the appropriate authority responsible for safety.
The authority may specify constructional requirements for the apparatus
and make regulations for its installation and operation.
0.3 Flammable gases and vapours may cause a fire or explosion when the
following three basic conditions are satisfied:
a) Presence of sufficient quantity of a flammable gas or vapour,
b) Mixing of flammable gas or vapour with air or oxygen in the proportions required to produce an explosive or ignitable mixture, and
c) Occurrence of ignition.
However, a
0.4 An electric spark or arc may ignite the explosive mixture.
limiting value of minimum ignition energy (MIE) is required before the
ignition can take place. t Since no apparatus has so far been specified for
the determination of MIE, it cannot be accepted at present as a means of
determining the grouping of explosive mixtures of gases and vapours in air.’
On the other hand, it has been possible to correlate the maximum safe
gaps (in the case of flameproof apparatus) and minimum igniting currents
(in the case of intrinsically safe circuits), and to group the flammable gases
and vapours on the basis of maximum experimental safe gap (MESG) and
minimum igniting current (MIC).
0.4.1 Small variations in test apparatus for determining MIC may result
Therefore, MIC is specified
in appreciable variation in the value of MIC.
3
IS : 9570 - 1980
as its ratio against the MIC of laboratory
referred to as MIC ratio in this standard.
grade methane,
and it has been
0.5 For the purpose of flameproof enclosures and intrinsic safety, flammable
gases and vapours have been classified into groups and subgroups on the
basis of their LMESG and MIC ratio.
0.6 While classifying the gases and vapours, into groups and sub-groups,
care has been taken that the resulting classification does not deviate more
than is necessary from the currently accepted practices for flameproof enclosures (see IS: 2148-1968*)
and intrinsic safety (see IS: 5780-1980$).
0.7 An attempt
for determining
can be allocated
has been made to avoid, as far as possible, the necessity
values of both MESG
and MIC before a gas or vapour
to a group or sub-group.
0.8 Besides the danger of explosion caused by an electric spark or arc,
there is also a danger of ignition by hot surfaces exposed to a flammable
atmosphere.
According to their ignition temperatures,
gases and vapours
A classification of the preferred limiting
fall into fairly well-defined groups.
temperatures
of the surface of electrical
apparatus
has been laid down
in IS: 8239-1976:.
0.9 In the preparation
of this standard, assistance has been derived from
IEC Pub 79-12 (1978) ‘Electrical
apparatus
for explosive gas mixture,
Part 12 - Classification of mixtures of gases or vapours in air according
to their maximum experimental
safe gaps and minimum igniting currents’,
issued by the International
Electrotechnical
Commission
(IEC).
1. SCOPE
1.1 This standard classifies the flammable gases and vapours into various
groups and sub-groups on the basis of their maximum experimental
safe
gaps (MESG)
and minimum igniting currents (MIC).
2. CLASSIFICATION
OF GASES AND
2.1 For the purpose of flameproof enclosures
vapours have been classified according to the
tus required for use in the particular gas or
The general principles used to establish
in the tables are given in 2.2, 2.3, 2.4, 3
2.2 Classification
According
VAPOURS
and intrinsic safety, gases and
groups or subgroups of apparavapour atmosphere.
the lists of gases and vapours
and 4.
to the Maximum
Experimental
Safe
Gaps (MESG)
*Specification for flameproof enclosures of electrical apparatus (first revision).
-&wxification for intrinsically safe electrical apparatus and circuits.
~Classitkation of maximum surface temperatures of electrical equipment for use in explosive atmospheres.
4
IS : 9570 - 1980
2.2.1 For flameproof enclosures, gases and vapours are classified according
The standard method
to their maximum experimental safe gaps (MESG).
for determining
MESG shall be the vessel described in Appendix C of
IS : 1248-1968*
but where determinations
have been undertaken only in
an 8-litre spherical vessel with ignition close to the flange gap; these can be
accepted provisionally.
The groups of apparatus are:
Group I : for mining applications (methane) ;
Group II: for applications in other industries.
2.2.2 Group II apparatus is subdivided and, for the purpose of classification of gases and vapours, the MESG limits are :
Group
Group
Group
NOTE2.3
IIA : MESG above or equal to O-9 mm;
IIB : MESG greater than O-5 and less than 0.9 mm;
IIC : MESG less’than or equal to O-5 mm.
MESG
is determined
According
Classification
at, or corrected
to the
to, 20°C.
Mipimum
Igniting
Currents
WC)
2.3.1 For intrinsic safety, gases and vapours are classified according to
the ratio of their minimum igniting currents with that of laboratory methane.
The standard method of determining MIC ratio shall be with the apparatus
described in IS : 9166-1979?,
but where determinations
have been under:aken in other apparatus these can be accepted provisionally.
The groups of the apparatus are:
Group I : for mining applications, (methane);
Group II: applications in other industries.
2.3.2 Group II apparatus is subdivided as follows and, for the purpose of
classification of gases and vapours, the MIC ratios are:
Group IIA : MIC ratio above 0.8;
Group IIB : MIC ratio between 0.45 and 0.8;
Group IIC : MIC ratio below 0.45.
2.4
Classification
According
to MESG
and MIC
2.4.1 For most gases and vapours it is sufficient to make only one determination of either MESG or MIC to classifjr the gas or vapow.
2.4.2 One determination
is adequate when:
Group IIA : the MESG exceeds O-9 mm;
Group
*Specification
tSpecification
IIB
or the MIC
ratio
exceeds
: Lz’ Ml%SG is between 0.55 and Q9 mm or the MIG
ratio is between O-5 and 0.8;
for flameproof enclosures of electrical apparatus.
for spark test apparatus for intrinsically safe circuits.
5
IS : 9570 - 1980
Group
IIC
: the MESG
than
2.4.3
Determination
is less than
O-5 mm or the MIC
ratio.
less
O-45.
of both the MESG
and MIC
ratio is required
when :
a) The MIC ratio determination
only has been made, and the ratio
is between O-8 and 0.9; when an MESG
determination
will be
required to classify the gas or vapour.
b) The MIC ratio determination
only has been made? and the ratio
is between 0.45 ‘and 0.5; when an MESG
determination
will be
required to classify the gas or vapour.
c) The MESG only had been found, and is between 0.5 and 0.55 mm,
when an MI?
ratio determination
will be required to classify the
gag or vapour.
3. CLA!%IFICATION
CHEMICAL
ACCORDING
STRUCTUBE
TO THE
SIMILARITY
OF
3.1 When
a gas or vapour is a member of the homologous series of compounds the classification of the gas or vapour can provisionally be infertid
from the results of determinations
of the other members of the series w’ith
lower molecular masses.
Care should be taken when such inferences are
used in allocating the compound to a group.
4. CLASSIFICATION
OF MIXTUBES
OF GASES
4.1 Mixtures
of gases should generally be allocated
a special deteymination
of MESG or MICratio.
5. TABLES
to a group
only after
OF GASES AND VAPOURS
5.1 The
classification
in this standard
provides guidance on the group
of electrical apparatus to be used in a particular gas/air mixture to avoid
It should be noted
the danger of an explosion from an electrical source.
that some materials listed, for example ethyl nitrate, are relatively unstable and may be prone to spontaneous decomposition.
5.2 The list of gases and vapours in Tables
to be comprehensive.
5.3
All isomeric
5.4 The
forms of the cornpoundS
significance
of the letter
a =
b =
classified according
classified according
c =
both MESG
d =
classified according
classification).
against
1,2 and 3 may not be considered
listed are included.
each gas is as follows:
to MESG
determination.
to MIC ratio.
and MIC
ratio have been determined.
to similarity
6
of chemical
structure
(provisional
IS : 9570 - 1980
TABLE
1
CLASSIFTCATION
OF FLAMMAB LE GASES OR ~VAPOURS FOR
WHICH GROUP IIA APPARATUS
IS REQUIRED
(Clause 5)
GASORVAPOUR
CHEMICAL FORMULA
METHOD OF
CLASSIFICATION
(2)
(3)
(1)
i) Hydrocarbons
Alkanes
Methane*
Ethane
Propane
Butane
Pentane
Hexane
Heptane
Octane
Nonane
Decane
Cyclobutane
Cyclopentane
a
Cyclohexane
C
Cycloheptane
d
Methylcyclobutane
d
Methylcyclopentane
d
Methylcyclohexane
d
Ethylcyclobutane
d
Ethylcyclopentane
d
Ethylcyclohexane
Decahydronaphthalene
d
GH,~H(WI~HI
(dekalin)
yH,(CH,),CH
CH(CH,),CH,
I
Alkenes
Propene (propylene)
*Methane
C,H,
= CH,
I
d
I
a
(CH,) refers to a gas with negligible impurities.
(Continued)
7
IS : 9570 - 1980
TABLE
1
CLASSIFICATION
OF FLAMMABLE
GASES OR VAPOURS
WHICH GROUP IIA APPARATUS
IS REQUIRED - Conk?
GASORVAPOUR
CHEMICALFORMULA
(2)
(1)
Aromatic Hydrocarbons
Styrene
Isopropcnylbenzene
(methylstyrene)
Benzoids
Benzene
Toluene
Xylene
Ethylebenzene
Trimethylbenzene
Naphthalene
Cumene
Cymene
C,H,CH = CH,
C,H,C(CH,)
= CH,
FOR
METHOD OF
CLASSIFICATION
(3)
b
a
$&H,
$ACJ*
(1 5 0 6
2HA(CHs)s
10 *
CsHsCH(CH,),
(CHACHC,H,CH,
Mixed Hydrocarbons
Methane (industrial)*
a
(calculated)
Turpentine
Petroleum naphtha
Coal tar naphtha
Petroleum (including motor spirit)
Solvent or cleaning petroleum
Heating oil
Kcrokne
Diesel oil
Motor benzole
2
:
:
:
a
ii) Compounds Contaiahg
Oxygen
Oxides (Including Ethers)
Carbon monoxidet
Dipropyl ether
Alcohols and Phenols
Methanol
Ethanol
Propanol
Butanol
Pentanol
co
(GHI,),O
C
a
CH,OH
C,H,OH
C,H,OH
C,H,OH
C,HnOH
*‘Methane’ (CH,) refers to the gas with negligible impurities.
‘Methane (industrial)’
includes methane mixtures containing up to 15 percent by volume of hydrogen.
t‘Carbon monoxide’ may include a moisture content sufficient to saturate a carbon monoxide-air mixture at normal ambient temperature.
(Continued)
8
Is:
TABLE
1
9570-1980
CLA!ZIFICATION
OF FLAMMABLE
GASES OR VAPOURS
WHICH GROUP ILA APPARATUS
IS REQUIRFD
- Contd
GAS ORVAPOUR
CHEMICALFORMULA
(1)
FOR
METHODOF
CLASSIFICATION
(3)
Hexanol
geg$
2
d
N&an01
Cyclohexanol
:
Methylcyclohexanols
CH,yH(CHs),yH
Phenol
CL-es01
4hydroxy-4-methylpentan-2-one
(diacetone alcohol)
CsHsOH
CHsC,H40H
(CH,),C(OH)
Aldehydes
Acetaldehyde
Metaldehyde
OH
d
d
d
CHsCO CHs
d
CHsCHO
(CH,CHO)n
Ketones
Acetone
Butanone (ethyl methyl ketone)
Pentan-2-one (propyl methyl ketone)
Hexan-Z-one (butyl methyl ketone)
Amy1 methyl ketone
Pentane-2, 4dione (acetylacetone)
Cyclohexanone
ESlerS
Methyl formate
Ethyl formate
Methyl acetate
Ethyl acetate
Propyl acetate
Butyl acetate
Amy1 acetate
Methyl methacrylate
Ethyl methacrylate
Vinyl acetate
Ethyl acetoacetate
CH,COOH
Contaiaiag
Compounds without Oxygen
Chloromethane
Chloroethane
CH,
H COO CH,
H COO CzHs
CH,COO CH,
CHXOO
C,H<
CH;COO C;H;
CH,COO CIH,
CH,COOC,HII
,
CHB = C(CH),COOCH,
CHp = C(CH),COOC,H,
CHsCOOCH
= CH,
CH,COCH&OOC,H,
Acids
Acetic acid
iii) Compounds
(C&)&O
CzH,CO CH,
C,H,CO CH,
2gBw&
g3)
5 11
CHsCOCH, $0
CH&Hs)&O
Halogens
CH,Cl
CaH5Cl
9
b
Is : 9570 - 1980
TABLE
1
CLASSIFICATION
OF FLAMMABLE
GASES OR VAPOURS
WHICH GROUP IIA APPARATUS
IS REQUIRED
- Cbntd
CHEMICAL
GASORVAPOUR
:LA
METHOD
OF
CLASSIFICATION
(3)
(2)
(1)
Bromoethane
Chloropropane
Chlorobutane
Bromobutane
Dichloroethane
Dichloropropane
Chlorobenzene
Benzyl chloride
Dichlorobenzene
Ally1 chloride
Dichloroethylene
Chloroethylene
d, d, d,-Trifluorotoluene
(benzotrifluoride)
Dichloromethane (methylene chloride)
FORM
FOR
d
a
CnH,Br
C,H,CI
C&H&l
C,H,,Br
C,H&l,
C,H&l,
C,H,Cl
C,H,CH,Cl
WWl,
CH, = CHCH,Cl
CHCl = CH Cl
CH, = Cl3 Cl
z
ti
ii!
t
a
C
C,H,CF,
CH,Cl,
CompOunn!s
with Oxygen
Acetyl chloride
Chloroethanol
CH,COCl
CH,CL CH,OH
iv) Compounds Containing Sulphur
Ethanethiol (ethyl mercaptan)
Propane-1-thiol (propyl-mercaptan)
C,H,SH
C,H,SH
C
a
(calculated)
a
Thiophene
CH=CH=CHS
Tetrahydrothiophene
CHZ(CH,),CH,S
a
NH,
a
a
v) Compounds Containing Nitrogen
Ammonia
Acetonitrile
Ethyl nitrite
Nitromethane
Nitroethane
Amines
Methylamine
Dimethylamine
Trimethylamine
Diethylamine
Trietbylamine
Propylamine
Butylamine
Cyclohexylamine
I
I
I
CH,CN
CH&H?ONO
CH,NO,
W-&NO,
:
d
CH,NH,
C,H,NH,
C,H,NHz
CH,(CH,),CH
NH,
(Cuntimud)
10
IS : 9570 - 1980
TABLE
1
CLASSIFICATION
OF FLAMMABLE
GASES OR VAPOURS
WHICH GROUP IIA APPARATUS
IS REQUIRED - Cord
GASOR VAPOUR
CHEMICAL
FORMULA
FOR
METHOD OP
CLASSIPICL~TION
(3)
2-Aminoethanol (ethanolamine)
(mono-ethanolamine)
Z-Diethylaminoethanol
Diaminoethane
Aniline
NN-dimethylaniline
Amphetamine
Toluidine
Pyridine
NH,CH,CH,OH
(C,H,),NCH,CH,OH
NH,CH,CH,NH,
GH,NH,
GH,N(CH,),
C.H,CH.CHcNH.JCH.
Is : 9570 - 1980
TABLE
2
CLMWFICATION
OF GASES OR VAPOURS
GROUP W APPARATUS
IS REQUIRED
FOR WHICH
(cnuse 5)
GAS OR
i) Iiydroearbons
Propyne
Ethylene
Cyclopropane
V-OUR
CHEMICALFORMULA
(2)
(1)
CH,C
(3)
= CH
b
:
1, 3-Butadiene
ii) Compounds Containing Nitrogen
Acrylonitrile
Isopropyl nitrate
Hydrogen cyanide
iii) Compounds Containing *ygm
Dimethyl ether
Ethyl methyl ether
Diethyl ether
Dibutyl ether
Oxione (ethylene oxide)
1, 2-Epoxypropane
CH, = CH CH = CH,
CH, = CHCN
(CH,),CHONO,
HCN
b
a
(CH,),O
C
d
c
C
C
:HaCH80
-
C
1, 3-Dioxolane
1, 4-Dioxane
~H,CH,OCH,CHI~
1, 3, 5-Trioxane
CH,OCH,OCH,O
d
I
acid,
C
C
CH,OC,H,
(GH,),O
(GH,),O
CHaYHCHsP
~H,cH,ocH~~
Butyl glycolate. (hydroxyacetic
butyl ester)
Tetrahydrofurfuryl alcohol
R~ETHODOF
~L.AWFICAl'lON
a
b
I
HOCH,COOC,H,
CH,CH,CHIOCH
CH,OH
a
d
Methyl acrylate
Ethyl acrylate
Furan
CH, = CHCOOCH,
CH, = CHCOOC,HS
yH=CHCH=CHy
a
a
a
Crotonaldehyde
Acrylaldehyde (acrolein)
CH&H = CHCHO
CH, = CHCHO
Tetrahydrofuran
~Hs(CH,),
a
a
(calculated)
a
iv) Mttpres
Coke oven gas
v) Compmads Containing W0ge11s
Tetrafluoroethylene
I-Chloro-2, 3-epoxypropane
(epichlorohydrin)
CHzy
d
(2,
a
a
OCHxCiHCHaC1
1
12
IS : 9570 - 1980
TABLE
3
CLASSIFICATION
OF FLAMMABLE
WHICH GROUP IIC APPARATUS
GASORVAPOUR
CHEMICAL
FORMULA
GASES OR VAPOURS
IS REQUIRED
FOR
METHODOF
CLASSIFICATION
(1’)
Hydrogen
Acetylene
Carbqn disulphide
Ethyl nitrate
(2)
HZ
C*H,
CS,
C,H,ONO,
13
(3)
c
c
c
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Regional Offices:
Central
: Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002
*Eastern
: l/14 CIT Scheme
VII M, V.I.P. Road, Maniktola, CALCUTTA700054
Northern : SC0 335-336, Sector 34-A, CHANDIGARH
Southern
160022
323 76 17
337 86 62
60 38 43
: C.I.T. Campus, iV Cross Road, CHENNAI 600113
235 23 15
twestern : Manakaiaya, E9, Behind Marol Telephone Exchange, Andheri (East),
MUMBAI 400093
832 92 95
Branch Offices::
‘Pushpak’, Nurmohamed Shaikh Marg, Khanpur, AHMEDABAD
380001
550 13 48
$Peenya industrial Area, 1 st Stage, Bangalore-Tumkur Road,
BANGALORE 560058
839 49 55
Gangotri Complex, 5th Floor, Bhadbhada Road, T.T. Nagar, BHOPAL 462003
55 40 21
Plot No. 62-63, Unit VI, Ganga Nagar, BHUBANESHWAR
40 36 27
Kalaikathir Buildings, 670 Avinashi Road, COIMBATORE
Plot No. 43, Sector 16 A, Mathura Road, FARIDABAD
Savitri Complex, 116 G.T. Road, GHAZIABAD
751001
641037
21 01 41
121001
8-28 88 01
201001
8-71 19 96
5315 Ward No.29, R.G. Barua Road, 5th By-lane, GUWAHATI
781003
5-B-56C, L.N. Gupta Marg, Nampally Station Road, HYDiRABAD
5411
500001
E-52, Chitaranjan Marg, C-Scheme, JAIPUR 302001
37 29 25
117/418 B, Sarvodaya Nagar, KANPUR 208005
Seth Bhawan, 2nd Floor,
LUCKNOW 226001
Behind
Leela
Cinema,
37
20 10 83
21 68 76
Naval
Kishore
Road,
23 89 23
NIT Building, Second Floor, Gokulpat Market, NAGPUR 440010
52 51 71
Patliputra Industrial Estate, PATNA 8OOOi3
26 23 05
Institution of Engineers (India) Building 1332 Shivaji Nagar, PUNE 411005
32 36 35
T.C. No. 14/l 421, University P. 0. Palayam, THIRUVANANTHAPURAM
621 17
695034
*Sales Offite is at 5 Chowringhee Approach, P.O. Princep Street,
CALCUTTA 700072
271085
tSales Office is at Novelty Chambers, Grant Road, MUMBAI 400007
309 65 28
*Sales Office is at ‘F’ Block, Unity Building, Narashimaraja Square,
BANGALORE 560002
222 39 71
Printed at Dee Kay Printers,
New Delhi- 11001.5, India.