Schedule IV

Glass Manufacture

1. Exemption.- If the Chief Inspector-cum-Facilitator is satisfied in respect of any factory or

any class of process that, owing to the special methods of work or the special conditions in a

factory or otherwise, any of the requirements of this Schedule can be suspended or relaxed

without danger to the persons employed therein, or that the application of this Schedule or

any part thereof is for any reason impracticable, he may by certificate in writing authorise

such suspension or relaxation as may be indicated in the certificate for such period and on

such conditions as he may think fit.

2. Definitions.- For the purposes of this Schedule,-

(a) "Efficient exhaust draught" means localised ventilation effected by mechanical

means for the removal of gas, vapour, dust or fume so as to prevent them (as far as

practicable under the atmospheric conditions usually prevailing) from escaping

into the air of any place in which work is carried on. No draught shall be deemed

efficient which fails to remove smoke generated at the point where such gas,

vapour, fume or dust originate.

(b) "Lead compound" means any compound of lead other than galena which when

treated in the manner described below, yields to an aqueous solution of

hydrochloric acid a quantity of soluble lead compound exceeding, when

calculated as lead monoxide, five per cent, of the dry weight of the portion taken

for analysis.

Explanation: The method of treatment shall be as follows:-

A weight quantity of the material which has been dried at 100 degree

Centigrade, and thoroughly mixed shall be continuously shaken for one

hour, at the common temperature with 1,000 times its weight of an

aqueous solution of hydrochloric acid containing 0.25 percent, by

weight of hydrogen chloride. This solution shall thereafter be allowed

to stand for one hour and then filtered. The lead salt contained in the

clear filtrate shall then be precipitated as lead sulphide and weighted as

lead sulphate.

3. Exhaust draught.- The following process shall not be carried on except under an efficient

exhausted draught or under such other conditions as may be approved by the Chief Inspector-

cum-Facilitator, -

(a) The mixing of raw materials to form a "batch".

(b) The dry grinding, glazing and polishing of glass or any article of glass.

(c) All processes in which hydrofluoric acid fumes or ammoniacal vapours are given

off.

(d) All processes in the making of furnace moulds or 'pots' including the grinding or

crushing of used 'pots’.

(e) All processes involving the use of a dry lead compound.

4. Floors and work-benches.- The floor and work-benches of every room in which a dry

compound of lead is manipulated or in which any process is carried on giving off silica dust

shall be kept moist and shall comply with the following requirements,-

The floors shall be,-

(a) of cement or similar material so as to be smooth and impervious to water;

(b) maintained in sound condition; and

(c) cleansed daily after being thoroughly spread with water at a time when no other

work is being carried on in the room.

The work-benches shall,-

(a) have a smooth surface and be maintained in sound condition, and

(b) be cleansed daily either after being thoroughly damped or by means of a suction

cleaning apparatus at a time when no other work is being carried on there at.

5. Use of Hydrofluoric Acid.- The following provisions shall apply to rooms in which glass

is treated with hydrofluoric acid,-

(a) there shall be inlets and outlets of adequate size so as to secure and maintain

efficient ventilation in all parts of the room;

(b) the floor shall be covered with gutta-percha and be tight and shall slope gently

down to a covered drain;

(c) the work places shall be so enclosed in projecting hoods that openings required for

bringing in the objects to be treated shall be as small as practicable; and

(d) the efficient exhaust draught shall be so contrived that the gases are exhausted

downwards.

6. Storage and transport of Hydrofluoric Acid.- Hydrofluoric acid shall not be stored or

transported except in cylinders or receptacles made of lead or rubber.

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7. Blow-pipes.- Every glass blower shall be provided with a separate blow-pipe bearing the

distinguishing mark of the person to whom it is issued and suitable facilities shall be readily

available to every glass blower for sterilizing his blow-pipe.

8. Protective clothing.- The occupier shall provide, maintain in good repair and keep in

clean condition for the use of all persons employed in the process specified in clause 3

suitable protective clothing footwear and goggles according to the nature of the work and

such clothing footwear, etc. shall be worn by the persons concerned.

9. Medical examination.- Every worker employed in processes specified in clause 2 shall be

examined within 15 days of his first employment. Such examination shall include pulmonary

function test and in suspected cases chest X-rays as well as test for lead in urine.