Heat seal blister : The blister is sealed to the blister card by heat and pressure. The card has a heat activated coating. Sealing requires a blister sealing unit. USK produces not only custom blister but also standard blister. The moulds for this type of packaging are available off the shelf. As a result the start-up costs are low the delivery times short. The wide range of designs and sizes means that suitable moulds are available for many different products.