Generic glass production

Only glass manufactured from primary raw materials is considered as a net contributor to atmospheric CO₂, and therefore there is an option for specifying the proportion of the furnace charge represented by recycled scrap glass (termed 'cullet'). A typical value for the 'cullet ratio' is assumed unless otherwise specified. In the case that no cullet is used, then the cullet ratio should be specifically set to 0 in order to override the default value.

To use this category, select the type of glass using the type drill option, then specify the quantity of glass produced using the massProduced profile item value. The returned value represents CO₂ emissions associated with this production - discounting a proportion typically represented by cullet (this typical value differs between glass types). To specify a different cullet ratio, enter the value, as a percentage between 1-100, using the culletRatio profile item value.

The data item represented by the 'unknown' drill option is an average value to be used when the glass type is not known. The assumed cullet ratio for this data item is 0.