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Safety and Health Topics > Semiconductors > Gallium Arsenide > Ingot Growing: Ampoule Load and Seal Ingot Growing: Ampoule Load and Seal First, the quartz ampoules are attached to an oil-diffusion vacuum pump assembly. The system is evacuated and the ampoule is heated with a hydrogen/oxygen torch. Finally the end of the ampoule is sealed, which creates a charged and sealed quartz ampoule ready for furnace growth. Potential Hazards Arsenic Flammable Gases, Fire Flammable Gases, Fire Potential Hazard Possible ignition of flammable gases, resulting in fire and/or explosion. Employees may also be exposed to gases above permissible limits. Possible Solutions See the Possible Solutions: Flammable Gases, Fire page. Use appropriate equipment, safety devices, and work practices associated with the hydrogen/oxygen torch.

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