S. Boehm, S. Frank
Management Approval (Name, Title, Date):
B. Mills (Lab Officer)
Thin Section Lab
This user guide will help thin section technicians bond the flattened billets to frosted slides. For more information refer to the Logitech Thin Rock Section Production manual, available in the Thin Section Lab both on a Logitech thumb drive in the bookcase and computer under the "Manual" folder on the desktop.
a. It is best to have them all the same thickness for the billet group that are being bonded.
b. Take note of how thick the slides are and write it on the sample tray. The samples will need to be 30 microns on top of the slide thickness.
3. Place the slides on the heat pad as well.
Make sure no wood particles fall into the resin; pick them out if they do.
The resin should stay good for about 45 minutes. If it starts to get too thick, place on the hot plate for a few seconds and it will become thin again for a very short time.
a. If the first stroke is discolored it means the resin is soaking in the vesicles. This is one way to tell if surface impregnation is needed.
4. Spread the resin around so it covers the whole sample.
5. Let it sit for a minute or two and watch if any bubbles form. If there are bubbles get them out with the metal point tool (Fig. 3).
6. Close the valve on the upper right side of the Logitech VS2 (Fig. 5) and make sure the valve on the impregnation stand is open (parallel with the vacuum hose) (Fig. 4).
7. Let the vacuum run for about one minute. Watch the billet while it is running.
8. Open the vacuum valve slowly. The bubbles should dissipate.
9. Repeat steps 6, 7 and 8.
10. Repeat step 6 and only let it run for about 30 seconds, and then shut the valve on the impregnation stand (perpendicular with the vacuum hose). Then open the vacuum valve. After the vacuum is fully released open the valve on the impregnation stand quickly.
11. Repeat step 10 until there are only a few bubbles left.
12. Remove billet from the impregnation stand and turn off the vacuum pump.
13. After the billet is surface impregnated it can be immediately bonded to a frosted slide.
3. Fill in the space between the two lines with resin. Put more resin on the right side.
4. Place the slide with resin side down onto the sample from left to right (Fig. 7). Lay down very slowly to prevent making bubbles.
5. Press on the middle of the slide moving any bubbles out to the sides (Fig. 8).
a. If there are lots of bubbles take off the slide. Wipe off the resin and clean the sample off with isopropyl alcohol then start over again.
6. Put the sample on the hot plate under the jig with the slide up and place a Teflon puck on top.
Lower the rod very gently down (Fig. 9).
a. Squeeze the spring and remove the Teflon puck to begin lowering.
7. Let the resin cure for about one hour.
a. Poke the resin with the metal point tool to make sure it is no longer sticky.
8. Write down the thickness of the frosted slide on the sample tray.
9. When cured remove sample and replace Teflon pucks.
6. Hook up the vacuum hose to the impregnation stand (Fig. 4).
7. Place the mold with the billet under the bell jar (Fig. 11).
8. Check the vacuum oil level. Refill if it starts to run low.
9. Turn on vacuum pump by turning on the power strip connected to the wall (Fig. 4).
10. Close the valve on the upper right side of the Logitech VS2 (Fig. 5) and make sure the valve on the impregnation stand is open (parallel with the vacuum hose) (Fig. 11).
11. Let the vacuum run for about one minute. Watch the billet while it is running.
12. Open the vacuum valve slowly. The bubbles should dissipate.
13. Repeat steps 9, 10 and 11. There should be fewer bubbles.
14. Repeat step 9 and only let it run for about 30 seconds, and then shut the valve on the impregnation stand (perpendicular with the vacuum hose). Then open the vacuum valve. After the vacuum is fully released open the valve on the impregnation stand quickly. This will force the resin into the billet.
15. Repeat step 13 until there are only a few bubbles left.
16. Remove the mold from the impregnation stand and turn off the vacuum pump.
17. Place the mold on the hot plate on top of a Teflon puck.
18. Let it cure until it is hard all the way through-it may take the whole day.
19. Peel away the mold and make sure to label the sample.
20. Remove any excess resin with the rock saw or the band sander.
21. When flattening the impregnated billet it is best to do it by hand. Make sure that all the resin is removed from the bottom so the billet is showing.
22. Treat the impregnated billet as a hard rock when bonding it to a slide.
Original document created Emily Fisher