FERROSILICON UN 1408 with 30% or more but less than 90% silicon (including briquettes) (see appendix to this schedule)

DESCRIPTION
Ferrosilicon is an extremely heavy cargo.
CHARACTERISTICS
Angle of repose	Bulk density (kg/m³)		Stowage factor (m³/t)
Not applicable	1,389 to 2,083 (1,111 to 1,538 for briquettes)		0.48 to 0.72 (0.65 to 0.90 for briquettes)
Size	Class	Subsidiary risk	Group
Up to 300 mm briquettes	4.3	6.1	B
HAZARD
In contact with moisture or water it may evolve hydrogen, a flammable gas which may form explosive mixtures with air and may, under similar circumstances, produce phosphine and arsine, which are highly toxic gases.
This cargo is non-combustible or has a low fire-risk.
STOWAGE & SEGREGATION
“Separated from” foodstuffs and all class 8 liquids.
HOLD CLEANLINESS
Clean and dry as relevant to the hazards of the cargo.
WEATHER PRECAUTIONS
This cargo shall be kept as dry as practicable before loading, during loading and during voyage. This cargo shall not be loaded during precipitation. During loading of this cargo all non-working hatches of the cargo spaces to which this cargo are loaded or to be loaded shall be closed.
LOADING
Trim in accordance with the relevant provisions required under sections 4 and 5 of this Code. When the stowage factor of this cargo is equal to or less than 0.56 m³/t, the tank top may be overstressed unless the cargo is evenly spread across the tank top to equalize the weight distribution. Due consideration shall be given to ensure that the tank top is not overstressed during the voyage and during loading by a pile of the cargo. Refer to the appendix to this schedule.
PRECAUTIONS
The manufacturer or the shipper shall provide the master with a certificate stating that, after manufacture, the cargo was stored under cover, but exposed to dry weather for not less than three days prior to shipment.
VENTILATION
Continuous mechanical ventilation shall be conducted during the voyage for the cargo spaces carrying this cargo. If maintaining ventilation endangers the ship or the cargo, it may be interrupted unless there is a risk of explosion or other danger due to interruption of the ventilation. In any case mechanical ventilation shall be maintained for a reasonable period prior to discharge. Refer to the appendix to this schedule.
CARRIAGE
For quantitative measurements of hydrogen, phosphine and arsine, suitable detectors for each gas or combination of gases shall be on board while this cargo is carried. The detectors shall be of certified safe type for use in explosive atmosphere. The concentrations of these gases in the cargo spaces carrying this cargo shall be measured regularly, during voyage, and the results of the measurements shall be recorded and kept on board.
DISCHARGE
Refer to the appendix to this schedule.
CLEAN-UP
After discharge of this cargo, the cargo spaces shall be swept clean twice. Water shall not be used for cleaning of the cargo space which has contained this cargo, because of danger of gas.
EMERGENCY PROCEDURES
SPECIAL EMERGENCY EQUIPMENT TO BE CARRIED
Self-contained breathing apparatus.
EMERGENCY PROCEDURES
Wear self-contained breathing apparatus.
EMERGENCY ACTION IN THE EVENT OF FIRE
Batten down and use CO₂ if available. Do not use water.
MEDICAL FIRST AID
Refer to the Medical First Aid Guide (MFAG), as amended.