INTRODUCTION
Diflon’s standard delivery program includes PTFE-lined carbon steel tubes and fittings in various versions from the DN 15 to the DN 600, for standard tube lengths up to 3 m and extended tube lengths up to 6 m. The continuous application temperature ranges from –29°C to +260°C, however, under certain conditions, these limits can be exceeded for a short time. In the standard versions (PN10/16 – ANSI 150) and at ambient temperature, the Difline products can be used in applications not exceeding 13 bar. For higher pressure values, tubes and fittings in the PN 25 and PN 40 versions are available on request. All Difline installation components feature high resistance against vacuum conditions. For absolute vacuum applications, the special versions HD (see table 1). The extraordinary properties of the PTFE material used by Diflon allow the application of Difline installation components on virtually all fluid media. The material’s properties are particularly appreciated in the handling of highly aggressive media such as hydrochloric, hydrofluoric and nitric acids, oleum (fuming sulphuric acid), etc. On the contrary, PTFE is not recommended with alkali metals, chlorotrifluoride and elemental fluorine (at high temperature and pressure).