Page 20 - E:\CloudStation\Project\1 DONE\Ranhill CIMAH\Flip Book\

Control of Industrial Major Accident Hazards (CIMAH) Report Page 2
Ranhill SAJ Sdn Bhd Revision 01
Introduction Date Aug 2019

2.1 Classification of Hazardous Substances

2.1.1 Indicative Criteria

The CIMAH Regulation provides guidance on the classification and the specific
indicative criteria of the hazardous substances. These criteria are described in Schedule
1 of the Regulations which are reproduced below:

i) Very Toxic Substances
a) Substances which correspond to line 1 of the table below; and
b) Substances which correspond to line 2 of the table below and which, owing to
their physical and chemical properties, are capable of producing major accident
hazards similar to those caused by the substances mentioned in line 1 of the
table below.

LD 50 LC50
LD 50 (oral)
No. (cutaneous) (inhalation)
Mg/kg body weight
Mg/kg body weight Mg/l
1. LD50 ≤ 5 LD50 ≤ 10 LC50 ≤ 0.1

2. 5 < LD50 ≤ 25 10 < LD50 ≤50 0.1 < LC50 ≤ 0.5

ii) Other Toxic Substances

Substances with the following values of acute toxicity as shown in the table below, and
having physical and chemical properties capable of producing major accident hazards.

LD 50 LC50
LD 50 (oral)
No. (cutaneous) (inhalation)
Mg/kg body weight
Mg/kg body weight Mg/l
1. 25 < LD50 ≤ 200 50 < LD50 ≤ 400 0.5 < LC50 ≤ 2