Test method versus experience

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  1. The best test method

  Lab test methods try to imitate reality, often with only mediocre success, but enormous expenditure. Certain test methods illustrate certain effective principles of the products. Hence, the experience made during wearing is the best method by far to experience the mode of action of SILVERPLUS®. Test it yourself. We will assist our partners.

• 2. A suitable test method

  

  The "Dynamic Shake Flask" test method according to the test standard ASTM-E2149-01 is the best method for demonstrating the antimicrobial effect of SILVERPLUS®. This test method imitates the wearing of textiles.

  Test principle: The contact between antimicrobially finished textiles and bacteria in a bacterial suspension is ensured by thorough mechanical shaking. The antimicrobial active ingredient does hence not necessarily migrate out of the substrate. The full antimicrobial effect of SILVERPLUS® by means of free, antimicrobial silver ions is normally attained after a dwell time of 24 hours.

• 3. The fastest test: the milk test

  
  • Necessary equipment: 2 small glass bottles with lid, pipettes, non-pasteurised milk, textile (untreated/treated)
  • Glass bottle 1: with untreated textile
  • Glass bottle 2: with textile treated with SILVERPLUS®
  • Apply 3 - 4 milk drops with a pipette to the textile
  • Close glass bottles and store warm for 2 - 3 days
  • Open glass bottles:
  

• 3. An unsuitable test method

  

  SILVERPLUS® is a non-migrating, antimicrobial product, which means that it is effective on the textile and does not form inhibition zones according to the Agar Diffusion Plate Test (SN 195 920).

  Test principle: The antimicrobial active ingredient moves out of the substrate (ideal case for migrating products) and forms an unpopulated zone (inhibition zone) in the environment. Only a migrating product shows an inhibition zone.

  For proving the effect of SILVERPLUS® the Agar Diffusion Plate Test is unsuitable.

  Picture:
  1 = Migrating product (inhibition zone), 2 = SILVERPLUS® (not migrating, no inhibition zone), 3 = Conventional product (not migrating, no inhibition zone), 4 = Untreated textile (grown with bacteria)