Dispensing-system provider I&J Fisnar recently issued ‘best practices’ information concerning the use of disposable parts used for dispensing adhesives commonly used in medical and electronic assemblies. The text of the company’s release:
Two of the most common adhesives used in electronics and medical industries are UV and cyanoacrylate fluids. Both adhesives require disposable products suited to their properties, and users should exercise caution when selecting the right syringe and need (tip) system to deliver the material.
UV fluids will vary in sensitivity, and it may be possible to use a less-opaque barrel. Users should always check their material suppliers’ specifications. In any case, the tip should be manufactured using a high grade of stainless steel.
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Cyanoacrylate requires polyethylene and/or Teflon disposable parts. The polymerization of cyanoacrylate is a reaction that occurs when the adhesive comes into contact with humidity or metal-ions present on the substrates. Teflon inserts are provided within a stainless steel need to avoid contact.
Cyanoacrylate is generally a clear liquid with a viscosity from 3 to 2,000 cps. Polymerization reaction starts at the surface of the adhesive toward the center of the deposit. In order to have good adhesion, or bond, between two substrates, the cyanoacrylate must be thin. Therefore, a precise dispensing system with suitable disposable parts is necessary.
I&J FISNAR, FAIR LAWN, NJ
www.ijfisnar.com
