Can I put it directly into the oven or dishwasher with the lid on?

For IWAKI food containers, the handling standards for the transparent body and the covering lid are exact opposites. The container body made of heat-resistant glass withstands microwaves as well as high-heat ovens and dishwasher washing^[1][2][3]. However, the lid is prohibited from both oven cooking and dishwasher use^[4][5].

Therefore, when cooking or reheating food in the oven, you must remove the lid and only put in the glass body^[6]. When washing dishes after a meal, you should also put only the body into the dishwasher and take out the lid separately to hand-wash it to avoid deformation^[7][8]. Meanwhile, even though the glass body is resistant to heat, it cannot be heated directly on an open flame such as a gas burner or highlight, or on an induction cooktop^[9].