PTFEs (Polytetrafluoroethylene) are polymers with high molecular weight that are widely used owing to their optimum chemical, electrical and thermal properties; their friction coefficient is very low. The essential features are the following.

PRACTICALLY TOTAL CHEMICAL INERTIA WITH REAGENTS AND SOLVENTS

They can be used in the more corrosive environments and do not contaminate the more sensitive materials in ultra-pure or corrosive applications.

VERY HIGH THERMAL STABILITY

Use temperature from -200°C to +300°C thermal degradation does not occur before +400°C

EXCEPTIONAL ELECTRICAL PROPERTIES

Extremely high electrical resistance low dielectric constant and low dielectric loss factor

OUTSTANDING NON-STICK PROPERTIES

Self-lubricating and shockproof features, toughness and flexibility even at low temperatures

APPLICATIONS

Chemical: very high chemical resistance to acids, alkali and solvents is typical of the fluoride polymers; it is therefore used for components in the petrochemical and chemical industry alimentary: physiologically inert, it is approved by some Authorities for uses in contact with foods electrical: excellent dielectric, self-extinguishing and stability in bad weather features make it increasingly used in this sector mechanical: its low friction coefficient makes it usable for very low load applications.

The magnetic stir bars shown on the following pages have internal magnets in Alnico V that gives them of high duration and power features. These magnets are encapsulated in first quality PTFE cases. The strict quality controls applied to these products ensure correct positioning of the magnetic core, the quality of the external surface, breakage resistance and constancy of the thickness of the external covering.