PURE POLITEF®-PTFE POLITEF (PTFE) was invented in 1938. It is the most preferable and known fluoropolimer among fluorine polymers. It has superior properties that none of the other industrial plastics have because of its strong connection between the carbon and fluor atoms and its molecular structure made of a long and linear carbon chain, which is full with fluor atoms. It has the widest working heat interval among all the industrial plastics (-260°C and +260°C) , complete unlimited resistance against humidity,  against environment conditions and against all the chemical materials used in the industry. It has the lowest static and dynamic friction coefficient among all the known solids, superior electrical isolation, non-adhesiveness, non inflammability and other properties like these. In addition to these, it has sufficient mechanical properties and full resistance against all chemical materials. All these provide POLITEF to be preferred more than the other materials at many usage areas. Moreover many times only POLITEF is being used.  POLITEF, is a material which can be used at many fields because of its above mentioned properties. Medicine, air and space technologies, cable and cable structure groups at computer sector, filter products, systems for determining leakage, valve spare parts, mechanical spare parts, electrical industry, food industry and textile industry are only small examples of POLITEF`s usage areas. PURE POLITEF® PRODUCTS · PLATES · FULL and EMPTY RODS · FULL and EMPTY WEDGES · SKIVED FILMS · BEARING STRIPS · SEGMENTS and STRIPPING FELTS · GASKETS · "O" RINGS · HOSES · CORDS · PACKING BOXES · VALVE MEMBRANES . PUMP DIAPHRAGMS · BELLOWS and ISOLATORS · POLITEF SHEATHING · UTUMAX PURE AND FILLED-IN POLITEF® COMPARATIVE TECHNICAL VALUES TABLE PROPERTIES TEST METHOD UNIT PURE POLITEF 15% GLASS- FIBRE POLITEF 25% CARBON POLITEF 50% BRONZE POLITEF SPECIFIC GRAVITY ASTM D 1457/18  gr/cm³ 2,14-2,2  2,1-2,28 2,04-2,28  3,8-4,0  USAGE TEMPERATURE - °C -260/+260  - - - MELTING TEMPERATURE ISO 3146 °C 325-330  - - - BRITTLENESS TEMPERATURE - °C -200  - - - PULLING STRENGTH ASTM D- 1708 kg/cm²  250-300 220-240  165-170 170-175 ELONGATION UPON BREAKING ASTM D- 1708  %  250-300 290-300  155-165  170-180 RESISTANCE TO STROKE ASTM D- 256  cm.kg/cm  15,5 14  8,5  11,0 SHORE D HARD ASTM D- 2240  -  53-57 57-62  60-67  63-70 DEFORMITY UNDER LOAD 230°C, 1day, 140kg/cm² ASTM D- 621  %  9,5-11 9,8  5-6  5-5,5           D-ELECTRIC RESISTANCE ASTM D- 149  KV/mm  50-80 16-19  13-19  ** THERMAL CONDUCTIVITY ASTM C- 177 Kcal/cm.°C.hour   0,035 0,048  0,085  0,083 THERMAL EXPANSION ASTM E 831 10-5/°C  12-14 10-14  8-11  8-9 IGNITION TEMPERATURE ASTM D- 1929  °C  530 630  630  640 ** Too high to be measured.