Etching Technology
16 Mar 2016
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Etching Technology

The etching process consists in a chemical surface treatment on virgin or filled PTFE. It allows PTFE to be glued on to surfaces of various materials, such as rubber, metal, plastics, etc.

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etching tecnology
 
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Some of the most common applications are for the tank lining where chemical agents must be stored, machine tool sliding surfaces, coupling with other materials for fi nished parts, etc.

Guarniflon® owns the most updated technologies devoted to the etching process on semifinished (sheets, tapes, tubes, bars) and finished PTFE products, virgin or compounded.
The etching process of Guarniflon® is capable of providing uniformly reactive surfaces.

Sheets and skived tapes, etched on one or two sides, are available in the following standard sizes:
Sheets
  Thickness:     min. mm. 1,5 - max. mm. 100
  Sizes (mm.):     600 x 600
1000 x 1000
1200 x 1200
1500 x 1500

Machined products:

Rings, bushes, parts and other designed products can be etched according to the end use partially or on the total surface.

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:

where:
Es = surface energy (dynes/cm)

= contact angle (degrees)

The graph in Figure 3 shows contact angle vs. surface energy.

Fig.1
 
Un-etched   Etched
  Fig.2

Contact Angle

 
Degree of Etching
20° - 45°
 
excellent
46° - 60°
 
fair
> 60°
 
poor
CONTACT ANGLE vs. SURFACE ENERGY SURFACE ENERGY IN DYNES/CM
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