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Guarniflon dispose de ses propres technologies expressément dédiées au traitement collable de semiproduits (plaques, bandes, tubes, tiges, etc.) et produits finis en PTFE aussi bien vierge que chargé. Le système récemment utilisé par la société garantit une excellente uniformité de traitement sur les surfaces qui doivent être traitées 1 ou 2 faces. Possibilité du traitement collable sur 1 ou 2 surfaces:
Pieces finis: On peut soumettre au traitement collable- partiel ou intégral-des produits finis comme bagues, O rings, etc. Quality of etching: GUARNIFLON can guarantee the quality of etching by the control of process parameters and by evaluating the extent of etching itself through a wettability test (Contact Angle Method), and an adhesion test (ref. ASTM D903). Contact angle method: It is based on the measure of the angle between the tangent to a distilled water drop and the PTFE surface (ie, the contact angle). In Figure 1 two examples of contact angle are illustrated - on unetched surface (poor wetting) and on etched surface (good wetting), respectively. The relationship in terms of performance between contact angle and etching is shown in Figure 2. Contact angle and surface energy of etched PTFE are related by the following formula:
The graph in Figure 3 shows contact angle vs. surface energy.
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