Cowan creates fused and flameworked glass sculptures from cullet and recycled industrial glass. Another source of glass was cullet, recycled broken or crushed glass. Glass that is crushed and ready to be remelted is called cullet. A facility processes waste glass into glass cullet, suitable for making new glass bottles. The recovered cargo included vessel fragments and glass cullet exported from Syria. The cullet is crushed and added to a raw material mix in a melting furnace. Of that, about 145,000 tonnes of non-refillable glass was recycled by crushing it to "cullet". The mould is then filled with cullet and transferred to a kiln. Glass was also recycled at this time in the form of cullet. It is made of cullet, foaming agent, modified additive and foaming accelerator. Glass cullet is also used in the construction industry for aggregate and glassphalt. The mould is now ready to be filled with glass cullet. Additional cullet may also have been collected from the ruins of abandoned Romano-British sites. There are two types of cullet&colon; internal and external. External cullet (which can be pre- or post-consumer) is classified as waste.