On 7/9/20 11:13 AM, Gedas wrote:
Pardon the OT post but we have so many knowledgeable folks here I was
hoping I could get a quick answer.
This is antenna & RF related so maybe not super far off OT hi-hi.
I have a 1/16" thick 3"x3" sheet of Teflon that I need to "glue" to the
front of a uW horn antenna to keep water, dirt, bugs, etc out of it. Can
anyone tell me what type of adhesive is known to adhere to Teflon and is
not too difficult to acquire? TU
Teflon (and UHMW PE) don't "bond" with adhesives. Non-stick is
non-stick, after all.
There are surface preparations using either a series of acid treatments
or small sparks that create tiny holes at angles, and then you can put
epoxy adhesive can flow into the hole, harden, and "hold it" more by
mechanical interference than "sticking"
Here's a summary of surface prep for various plastics
Polar Thermoplastics (Nylon, ABS, Polycarbonate, Acrylate)
Degrease with trichloroethylene
Abrade
Degrease
Polyethylene, Polypropylene
Degrease with trichloroethylene
Oxidize by immersing in a solution:
7 parts sodium dichromate
10 parts water
150 parts concentrated sulfuric acid
for 10-15 minutes
Rinse with hot distilled water
Dry and coat with adhesive immediately
Thermoset plastics (Epoxies, Polyurethane, Polyester, Melamine, Phenolic)
Degrease with acetone, MEK, or trichloroethylene
Mechanically abrade (sandblast)
Degrease
Chromic Acid (for PE and PP) is evil stuff. Not as bad as HF, but be
careful.
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
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