From this, it sure looks like Plexus is the best structural option; 5200 would be next, but it’s not compatible with acrylic. I’m surprised that LifeSeal shows such good characteristics. VHB tape, 4200 and Sika are all in about the same range. Looking at a cut sheet for Dow 795 (which you didn’t include here, but has been used with VHB tape), it’s not really providing much in the way of strength, with a >21 days cure tension adhesion strength of 45psi.
I thought the Dow 795 had greater structural characteristics than the cut sheet shows: http://www.dowcorning.com/DataFiles/090276fe801a7bbe.pdf — Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > On Oct 21, 2015, at 3:40 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > I did a bit of quick research on adhesives. My quick look and the > terminology may lead to inaccuracies. I am not a materials engineer. For > instance, shear strength numbers were either listed as shear strength or lap > shear strength, then there is dynamic vs static whatever. Please take the > info with a LARGE grain of salt. > > I listed the references so you can look them up yourself. > > This may interest some. > > Material > > Static or Lap Shear strength, psi > > Tensile strength, psi > > Reference > > > > > > Plexus MA530 > > 1600-2200 > > 3000-3500 > > http://www.rshughes.com/p/Plexus-MA530-Black-Methacrylate-Adhesive-50-Gal-Drum-Shear-Strength-1600-To-2200-Psi-Tensile-Strength-3000-To-3500-Psi/plexus_it206/ > > <http://www.rshughes.com/p/Plexus-MA530-Black-Methacrylate-Adhesive-50-Gal-Drum-Shear-Strength-1600-To-2200-Psi-Tensile-Strength-3000-To-3500-Psi/plexus_it206/> > Sika > > n/a > > 160 > > https://www.google.com/search?q=sika+295uv+shear+strength&ie=utf-8&oe=utf-8 > <https://www.google.com/search?q=sika+295uv+shear+strength&ie=utf-8&oe=utf-8> > 3M 5200 > > 360 (fiberglass) > > 630-705 > > http://multimedia.3m.com/mws/media/158782O/adhesive-sealant-5200-tech-data.pdf > > <http://multimedia.3m.com/mws/media/158782O/adhesive-sealant-5200-tech-data.pdf> > 3M 4200 > > 20-165 > > 180 > > http://multimedia.3m.com/mws/media/891179O/3m-marine-fast-cure-general-purpose-adhesive-sealant-4200fc.pdf > > <http://multimedia.3m.com/mws/media/891179O/3m-marine-fast-cure-general-purpose-adhesive-sealant-4200fc.pdf> > LifeSeal > > 240 > > 290 > > http://www.boatlife.com/content/NEED%20LifeSealR%20POLYURETHANE-SILICONE%20SEALANT.pdf > > <http://www.boatlife.com/content/NEED%20LifeSealR%20POLYURETHANE-SILICONE%20SEALANT.pdf> > 3M VHB tape 59XX > > 1000 > > 90-100 > > https://multimedia.3m.com/mws/media/67100O/3mtm-vhb-tapes.pdf > <https://multimedia.3m.com/mws/media/67100O/3mtm-vhb-tapes.pdf> > Dennis C.
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