Instructables

Bond Rawhide to Polycarbonate

Picture of Bond Rawhide to Polycarbonate
u will need:

1. Rawhide 
2. Polycarbonate
3. Water  based polyurethane varnish - like TDS Hauthane HD-2209
4. press or clamps 
5. Heavy grit sand paper  60-80 grit
6. MDF


I MADE IT AT TECHSHOP!

 
Remove these adsRemove these ads by Signing Up

Step 1: Build a press or get some clamps

Picture of Build a press or get some clamps
7728143620_7a53b442f3_z.jpg
7728160648_be9737b28d_z.jpg
7729991244_4d3c8bf766_z.jpg
7730024966_cb3c00f3b8_z.jpg
Water based varnish works well to bond rawhide to polycarbonate. most epoxy is too brittle- and contact cement is too weak- and will both fail a heat/freeze test.

because the water based varnish proved to be the best glue for this application a manual press or clamping pressure had to be used instead of vacume bagging because the rawhide and varnish need to be exposed to air to dry.  MDF is the perfect material to protect the rawhide and disperse clamping pressure because it can let air pass.

picture shows a large press constructed of Unistrut from Lord and Sons in San Jose 

Step 2: Prepare the substrates for bonding

Picture of prepare the substrates for bonding
7728415956_047951dc9e_z.jpg
7728414152_bd82816aaa_z.jpg
sand the rawhide and polycarbonate with the rough grit sand paper.

in the photo's I used a DA sander with 60 grit sand paper.

Th polycarbonate was clear before sanding, sand it until frosted to remove the hard top layer.

clean off the dust.

Step 3: Glue and Press

Picture of Glue and Press
7729999960_2d954647dd_z.jpg
7730002494_d7a18b7bbd_z.jpg
7729995786_c2c50d15b6_z.jpg
use a lot of glue, clamping pressure has to squeeze glue out of the sides during clamping  to ensure no air bubbles. Rawhide is stubborn a lot of pressure is needed to force it flat.

clamp in the center first then work your way out to push air out.



Step 4: Admire your results

Picture of Admire your results
8038288062_de65d4ecd5_z.jpg
8038287204_b4d44de104_z.jpg
8038282365_6c242fb8cb_z.jpg
pull the rawhide, polycarbonate  and MDF sandwich out of the jig/clamp.  the MDF will be stuck to the edges so pull it off it is weaker than the glue in shear strength.


!
Looks cool, but why glue leather to polycarbonate?
alvaro.us (author)  tjolley20006 months ago
its rawhide-(un-processed leather), rawhide is translucent, polycarbonate is clear, and heat insulative, rawhide is sensitive to heat, both rawhide and polycarbonate will be ontop of L.E.D. array - and polycarbonate is electrically non-conductive -ish.. the purpose was combination aesthetic and problem solve--
Interesting process, but what is the purpose or application?
alvaro.us (author)  shobawillyshobawilly6 months ago
it is an artistic application, see " http://www.instructables.com/id/LED-Light-box/ " for the end result -

-
alvaro.us (author) 1 year ago
the freeze/heat test was to test the integrity of the bond as it went through varying climates during shipping and storage. Rawhide responds to humidity and temperature changes by shrinking and expanding with a surprising amount of force. it would pull itself off of an epoxy bond to polycarbonate within 30 min of direct sunlight exposure, or 10 min in a 180F deg oven. 3M has a heat resistant flexible epoxy but it is around $1K a gallon, a gallon of varnish is 20$. The application required glass like clarity and temperature resistance, see my instructable "L.E.D. light box" to see what the rawhide/polycarbonate composite was used for.
jmray1 year ago
You mentioned freeze/thaw test...I'm curious about how this was used. Thanks
Pro

Get More Out of Instructables

Already have an Account?

close

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!