FAQ's

  • How do I measure my treatment level?
    You can measure the surface energy or Dyne Level of your material by using of Dyne Test Pens /Fluids or by contact angle measurement. Please visit our "Measurement" page for further information.
  • What does Dyne Level / mN/m mean?
    The Dyne level reflects the surface wettability - the higher the Dyne level, the better the wettability/adhesion. The Dyne is the unit of force equal to the force that imparts an acceleration of 1cm/sec/sec to a mass of 1 gram. 1 dyne (mN/m) = 0.00001 Newtons, or = 1gm/secĀ² , or 1 Newton = 100,000 dynes.



    It is often necessary to bond plastic materials to metals or other plastic materials, or simply paint or print onto a plastic surface. In order to successfully accomplish this, the liquid adhesive, paint or ink should be able to wet the surface of the material. Wettability depends on one specific property of the surface: Surface energy. The surface energy of the solid substrate directly affects how well a liquid wets the surface. To achieve good wettability the surface energy of the substrate needs to exceed that of the surface tension of the liquid by around 2 - 10 mN/m (Dynes). Wettability is easily demonstrated by contact angle measurements. The contact angle is the angle between the tangent line at the contact point and the horizontal line of the solid surface (fig 1).



    When a liquid droplet is set on a smooth solid horizontal surface, it may spread out over substrate and the contact angle will approach zero if complete wetting takes place. Conversely, if wetting is partial, the resulting contact angle reaches equilibrium in the range material's surface energy and positively affect adhesive characteristics by creating bonding sites. Various methods of measuring wettability are available: Contact Angle Measurement, Dyne inks, Dyne pens etc. The table below sets out typical values for a range of substrates and typically applied liquids (fig 2).
  • What is Surface Energy?

    Surface energy may be defined as the excess energy at the surface of a material compared to the bulk.  Every solid surface has a specific and measurable Surface Energy.  The unit of measurement for Surface Energy is the Dyne/cm² or mN/m.

  • What is Surface Tension?

    Surface Tension: may be defined as the excess energy at the surface of a material compared to the bulk. Every liquid has a specific and measureable Surface Tension.  The unit of measurement for Surface Tension is the Dyne/cm² or mN/m.

  • Where do I find the Dyne Testing website?

    You can visit the Dyne Testing website at www.dynetesting.com

  • Why is Bonding to Plastic & Rubber so Difficult?

    Read here how Managing Director of Dyne Technology, Mr Chris Lines explains why it is so difficult and how you can overcome this problem.

    http://www.dynetechnology.co.uk/pdfs/BondingtoPlasticandRubber.pdf

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