It is meticulously crafted from high-quality borosilicate glass 3.3, ensuring exceptional durability and chemical resistance. Complying with DIN EN ISO 1042 standards, this Class AW flask features a blue printed graduation mark for clear visibility and precise measurement. Each flask is calibrated to contain (IN) at a reference temperature of +20 °C and includes a batch certificate along with a declaration of conformity. Equipped with an ergonomic polyethylene stopper (NS 29/32), it provides a secure seal and facilitates easy handling, making it ideal for accurate preparation and storage of standard solutions in laboratory settings.