Teflex

Material Designation	Filler	Application
PTFE 528	None	Electrical insulating parts, moderately stressed precision molded parts for chemical and general machinery usage, e.g. Gaskets, Compensators.
PTFE 537	Glass Fibre	Used for higher pressure exposed gaskets, also for piston rings, bearings and chemically inert valve seals
PTFE 552	Bronze	This material has maximum pressure and wear resistance; It is used for bearings, piston seals, guides etc. In general machine construction, it has however, only limited resistance to chemicals.
PTFE 561	Carbon	Used for dynamic seals, bearings and valve seals; This material is pressure and abrasion resistant, is chemically inert and has good thermal conductivity.

Referred to as P.T.F.E, is one of the most interesting synthetic plastic materials,
because of its outstanding properties.

PTFE	Is resistant to almost all chemicals and exhibits absolutely no ageing,
PTFE	Offers a thermal application range from -200 degrees C to + 260 degrees C.
PTFE	Has excellent anti-stick properties
PTFE	Has a very low coefficient of friction, of practically identical static and dynamic valves. There is no "Stick-slip" even when motions is super slow.
PTFE	Is self lubricating. This means, stationary or seals in motion may under certain conditions operate without any lubricant.
PTFE	Is physiologically neutral up to + 200 Degrees C,
PTFE	Has superior electically insulating properties compared to all other synthetic plastic materials. These insulating valves remain constant over broad frequency ranges regardless of environmental conditions (Temperature, humidity).