Dry ice is the solid form of carbon dioxide (CO2). It's called "dry ice" because it does not melt like wet ice. Instead, dry ice converts into carbon dioxide gas. Because dry ice is extremely cold ( -109°F/-78.5°C), non-toxic, and completely dry, it is commonly used as an expendable refrigerant to ship frozen food or medical products or to cool materials during production. The other major use of dry ice is for dry ice blast cleaning, an effective and environmentally friendly way to clean industrial equipment. Pellet dry ice has a 3/4 inch diameter. This amount of dry ice is designed to last several days. Product should not be put in small spaces (freezer, walk in cooler, small rooms with no ventilation). To dispose of left over dry ice, you should place the product in a well-ventilated area. Do not dispose of dry ice in a sewer, garbage disposal, garbage chute, etc. Use gloves with handling dry ice, this product should not be handled with bare hands.