Further, battery factories were not environmentally friendly. Graphite powder could create serious air pollution and cause pneumoconiosis as well as other occupational diseases. The factories also contained lots of combustible materials such as cardboard and motors. The use of towngas in heating wax could easily lead to fires. Thus, the government tightened the health and fire regulations, which also led to rising running costs. The increasingly unfavorable business environment caused lots of factory owners to sell or rebuild their factories and switch to property business. For example, when Hing Wah Factory was closed down, the factory premises were sold to Sun Hung Kei. Gold Peak also switched to producing higher quality batteries while developing the electronic business at the same time. Golden Power was acquired by Guangzhou Battery Factory, and was kept in Hong Kong to process some parts outsourced from the Guangzhou factory. These products would be labelled as products of Hong Kong so as to enjoy the quotas under the Imperial Preference. Nowadays there were no more large scale battery factories in Hong Kong." /> Further, battery factories were not environmentally friendly. Graphite powder could create serious air pollution and cause pneumoconiosis as well as other occupational diseases. The factories also contained lots of combustible materials such as cardboard and motors. The use of towngas in heating wax could easily lead to fires. Thus, the government tightened the health and fire regulations, which also led to rising running costs. The increasingly unfavorable business environment caused lots of factory owners to sell or rebuild their factories and switch to property business. For example, when Hing Wah Factory was closed down, the factory premises were sold to Sun Hung Kei. Gold Peak also switched to producing higher quality batteries while developing the electronic business at the same time. Golden Power was acquired by Guangzhou Battery Factory, and was kept in Hong Kong to process some parts outsourced from the Guangzhou factory. These products would be labelled as products of Hong Kong so as to enjoy the quotas under the Imperial Preference. Nowadays there were no more large scale battery factories in Hong Kong." /> Further, battery factories were not environmentally friendly. Graphite powder could create serious air pollution and cause pneumoconiosis as well as other occupational diseases. The factories also contained lots of combustible materials such as cardboard and motors. The use of towngas in heating wax could easily lead to fires. Thus, the government tightened the health and fire regulations, which also led to rising running costs. The increasingly unfavorable business environment caused lots of factory owners to sell or rebuild their factories and switch to property business. For example, when Hing Wah Factory was closed down, the factory premises were sold to Sun Hung Kei. Gold Peak also switched to producing higher quality batteries while developing the electronic business at the same time. Golden Power was acquired by Guangzhou Battery Factory, and was kept in Hong Kong to process some parts outsourced from the Guangzhou factory. These products would be labelled as products of Hong Kong so as to enjoy the quotas under the Imperial Preference. Nowadays there were no more large scale battery factories in Hong Kong." />