Fourth
Lab Task
Testing
of adhesives on rocks and SiO2 surfaces.
We have identified two epoxies that stick to rocks when applied
underwater. They are "Smart GlueR" and Ace hardware store
#10232 water-proof epoxy putty. In addition, Dr. Tivey has
suggested that we try hydraulic cement. We will use "Sta-Dri"
hydraulic cement. There are two goals: to find an adhesive
that can be used as a marker and to find an adhesive that
can bond a metal marker to a rock. Deep seafloor volcanic
rock has a smooth and glassy surface. We will test some ordinary
glass (SiO2) as a substitute. In the next lab, actual volcanic
rocks, gathered on Alvin missions, will be tested. Dr. Tivey
will supply them from the WHOI collection. Send a collection
party outside to collect two buckets of sea water. Inspect
the life-testing sample cage and make a note of the water
temperature. Test rock and glass (both smooth side and etched
side) with Smart Glue, Ace epoxy, and cement. Test for marking.
Try mixing some glitter powder into the Smart Glue to see
if it can be used as a marker. Test for bonding to a piece
of plastic and to a piece of metal. Make careful notes in
your note book about what worked and what didn't work. Fill
in the spreadsheet below. You can write "yes" or "no" to indicate
outcomes. You may also make up your own code, if you prefer.
| marking |
|
rock |
smooth
glass |
etched
glass |
comments |
| |
Smart
Glue |
|
|
|
|
| |
Ace
epoxy |
|
|
|
|
| |
hyd.
cement |
|
|
|
|
| mark+pigment |
|
|
|
|
|
| |
Smart
Glue |
|
|
|
|
| |
Ace
epoxy |
|
|
|
|
| |
hydr.
cement |
|
|
|
|
| bond
to plastic |
|
|
|
|
|
| |
Smart
Glue |
|
|
|
|
| |
Ace
epoxy |
|
|
|
|
| |
hydr.
cement |
|
|
|
|
| bond
to metal |
|
|
|
|
|
| |
Smart
Glue |
|
|
|
|
| |
Ace
expoxy |
|
|
|
|
| |
hydr.
cement |
|
|
|
|
|
