Liaoning Huahai-Lanfan Chemical Technology Co., Ltd. is a technological chemical enterprise encompassing scientific research, development and production. Our company specializes in production of series of photosensitive materials of o-diazo-naphthoquinone compouds, including Diazo-2,1,4-chloride(CAS36451-09-9),Diazo-2,1,5-chloride(CAS3770-97-6),Diazo-2,1,5-sulfonic acid sodium salt (CAS 2657-00-3) which can be used to produce the photoresist for printed circuit, integrated circuit, LCD and the sensitizer for positive PS plates since 1998.Depending on superior quality ,these products are not only marketed well in the whole country but also be exported to Europe and Japan. Now our production capacity of NAS-5(Diazo-2,1,5-sulfonic acid sodium salt) has reached 1,500T per year , NAC-4(Diazo-2,1,4-chloride) and NAC-5(Diazo-2,1,5-chloride) has reached 120T per year. At the same time we own a well-equipped R&D center that have developed a series of NIR (near infaraed )dyes applying in CD-R or DVD-R,forgery prevent agent in printing,xerography(color printer) and so on .