I guess I'm a little dense. If this tape "only sticks to itself" how
does this create a waterproof and/or moisture proof package? What's to
stop moisture from migrating up under the tape at the junction with the
substrate (coax, whatever)?
73 de Terry KK6T
Steve Davis -Davis RF Co. wrote:
> Regarding AMP Fusion Tape, I prefer that to any other waterproofing (vs.
> moisture proof) tape or adhesive backed (water proof) heat shrink (usually
> only 2/1 and 3/1), due to no heat required, no application before soldering
> or joining. You can dispense with "marine electrical goop" (which needs
> overlaid wrap to avoid cracking from UV ...then the overlay wrap needs to be
> UV resist) or "sealing in mayonnaise jars", etc, etc.
> Descriptive info from Dan Barnes (automotive engr): "Heat-shrink tubing.. is
> limited to the sizes on hand, and can adjust to a limited range of diameters.
> Plus, it takes heat to install, which is not always desirable. Self-fusing
> tape achieves the ideal at which self-adhesive electrical tape aims.
> With AMP Fusion self-fusing tape, there is no separate adhesive, so there can
> be no shmoo (edit: mess). The tape bonds to itself. My understanding is,
> polymer bonds are broken when the material is stretched. When it is wrapped
> around itself, it is just as easy to reform those bonds with the material in
> the adjacent layer of tape as within the original layer. Thus, the wrapping
> becomes a single, homogeneous mass. The result is almost like dipping the
> connection in plastic, but the process is dry, free of mess, and happens at
> room temperature. Removing it, if necessary, is just like removing any other
> insulation, since it sticks only to itself. (edit: Use a straight safety
> razor blade, or Exacto knife to cut a line down one side and peel off)." end
> Contrary to some of the descrip's that suppliers indicate, this tape is more
> than "moisture proof". AMP has assured me that it is "waterproof" (to no
> specified immersion depth) and my marine electrical customers use it in
> bilges, etc., therein water (two overcoats vs. one, for low voltage DC
> applications, but , for liability reasons, WARNING: I must say that a user
> must obtain from AMP a written spec before submersion for any application and
> this spec from AMP does not exist at present..... bear with me
> gentlemen......, if I characterize its waterproof aspect by the marine guys'
> immersed use, then some CB'r (ham wannabe of course) monitoring TT will seal
> his barrel joint from his RG58 to RG217 with this tape, then lay the cable
> through his father's tropical fish pond, turn on the high amp alternators and
> 10 kW RF, causing a fish fry as well as executing the neighbors in their
> swimming pools). HI
> Easy to use: you just peel off the backing, stretch it and apply....it is
> NOT sticky or messy! Simple instructions come with it from us. You can
> find this fusion tape, and 3M33+ (flame/U.V. resistant electrical tape) on
> our web site at http://www.davisrf.com/coaxseal.php
> Hope this is of some help!
> 73, Steve Davis, K1PEK DAVIS RF Co.
> ~ Davis RF Co., Div. of Orion Wire Co.,Inc.
> Distribution to numerous industries, Andrew
> Heliax; Times Microwave LMR; RFS Celwave and others.
> Cable design engineering. RF Peripherals.
> Tel: 1-800-328-4773 (1-800-DAVIS RF) Tech'l: 1-978-369-
> 1738, Fax: 1-978-369-3484
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