Below is a list of Blister Packaging manufacturers from Duarte, California. Blister packaging is a product sealing method in which a product is placed against a plastic or cardboard base and covered with a transparent plastic dome, rectangle or form fitting cover. Blister packaging is just one of many packaging designs manufacturers use to seal their products in advance of end-user purchase; it is a very effective way of protecting a new product from damage or becoming dirty while simultaneously allowing potential buyers to examine the product thoroughly.