Page 357 - The Central Motor Vehicles Rules, 1989

RULE 137 THE CENTRAL MOTOR VEHICLES RULES, 1989 329
1
[TABLE II
INDICATIVE CRITERIA
(A) Explosives:
An explosive means a solid or liquid or pyrotechnic substance (or a mixture of
substances) or an article,—
(i) which is in itself capable by chemical reaction of production of gas at such
a temperature and at such a speed as to cause damage to the surroundings;
(ii) which is designed to produce an effect, by heat, light, sound, gas or smoke
or a combination of these, of non-detonative self sustaining exothermic
chemical reaction.
(B) Gas:
(1) A gas is a substance which—
(i) at 50˚C has a vapour pressure greater than 300 kPa; or
(ii) is completely gaseous at 20˚C at a standard pressure of 101.3 kPa.
(2) Substances of gas are assigned to one of three following divisions based on the
primary hazard of the gas during transport:—
(a) Flammable gases:
Gases which at 20˚C and a standard pressure of 101.3 kPa,—
(i) are ignitable when a mixture of 13 per cent or less by volume with air; or
(ii) have a flammable range with air of at least 12 percentage points regardless
of the lower flammable limit. Flammability shall be determined by tests or
by calculation in accordance with methods adopted by International
Standards Organization [ISO:10156: 1996] or by Bureau of Indian Standards
[IS: 1446 - 1985];
(b) Non-flammable, non-toxic gases:
Gases which are transported at pressure not less than 280 kPa at 20˚C, or as
refrigerated liquids and which,—
(i) are asphyxiant-gases which dilute or replace the oxygen normally in the
atmosphere;
(ii) are oxidizing-gases which may, generally by providing oxygen, cause or
contribute to the combustion of other material more than air does; or
(iii) do not come under the other divisions;
(c) Toxic gases:
Gases which are known to be so toxic or corrosive to humans as to pose a hazard
to health.
Note : Gases meeting the above criteria owing to their corrosivity are classified as
toxic with a subsidiary corrosive risk.
(C) Flammable chemicals:
(i) Flammable Gases
Gases which at 20˚C and at standard pressure of 101.3 kPa are—
(a) ignitable when a mixture of 13 percent or less by volume with air, or
(b) have a flammable range with air of at least 12 percentage points
regardless of the lower flammable limits.

1 Tables II and III substituted vide GSR 349(E), dt. 1-6-2005, w.e.f. 1-6-2005.