Oven Safe Up to 240°C
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It is not design for thermal insulation, that been said it is made from 18/10 stainless steel and air tight so it will hold the temperature well for approximately 30 minutes
I am not sure what welding technic / material has been used but it has been tested for strength and can with stand the force of opposing fork lift trucks. The lunch box has been tested for heavy metals, but this will only relate to the internal as this is the area of the product that will come into contact with food.