REFLECTOR:Epoxy Tests

[Scott Derrick]

I found this on the cozy mailing list. Very interesting...


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From: Chris van Hoof <cvh@iafrica.com>
Organization: C van Hoof - Architect
Subject: COZY: EPOXY almost final results

Hi to all,

So, the epoxy specimen went to the lab.... then they told me that the
samples were manufactured with the UNI in the wrong direction.

That was disappointing....so we made another batch, all under normal
conditions, these were acceptable for testing and the results are as
follows:-

INTERLAMINAR SHEAR STRENGHTS, Mpa

Specimen Epoxy  Epoxy  Epoxy  Epoxy  Epoxy  Epoxy  Epoxy  Epoxy  Epoxy
          #2     #3     #4     #6     #7     #8     #9     #10    #11
1        41.8   25.0   23.7   26.9   29.5   18.0   39.1   40.3   25.4
2        42.0   25.6   23.9   27.2   30.3   19.5   39.8   40.3   28.5
3        42.2   26.5   24.0   27.9   31.2   22.6   40.7   41.7   28.7
4        42.3   26.6   24.3   28.4   32.0   23.1   41.2   42.1   29.1
5        42.6   27.0   24.8   28.8   32.0   24.4   41.7   42.7   29.5
6        42.9   27.3   24.9   28.8   32.2   25.7   41.8   43.5   29.5
7        43.0   27.8   25.9   29.5   33.0   --.-   --.-   44.2   30.7
8        44.2   --.-   --.-   29.8   33.1   --.-   --.-   --.-   32.5

Mean     42.6   26.5   24.5   28.4   31.7   22.2   40.7   42.1   29.2
Std. Dev 0.761  0.969  0.764  1.03   1.26   2.93   1.08   1.49   2.02
Coeff Var0.018  0.037  0.031  0.036  0.040  0.132  0.027  0.035  0.069

(Not enough Epoxy was available to do #1 & #5 this time around, hope
this does not cause anyone a problem. If it is really needed I'll try to
obtain more, but won't do so unless specifically requested by a Cozy
builder.)

To recall the types:-

1 JEFCO           Resin 1307      Hardner 3102    Mix 100:25
2 PROSET          Resin 125       Hardner 226     Mix 100:30
3 EPOLAM 2020     system                          Mix 100:34
4 EPO 685         system                          Mix 100:38
5 REA HP          system                          Mix 100:38
6 EPOLAM 2022     system                          Mix 100:40
7 EPOLITE 2427    system                          Mix 100:44
8 EPOLITE 2410    Resin 2410      Hardner 2184    Mix 100:44
9 SP Epoxy        system                          Mix 100:25
10Shell		info to follow in summary
11Vinylester	info to follow in summary

Note the strenght of type 8, which is very low and used by Cozy builders,
please do your own tests here, to verify....

More will follow as and when it becomes available.

All the above obtained thru' the kind help and assistance from the CSIR
and in particular Dr Jim Huston and Mr Chris Adrian.

Hope this helps someone.

Chris #219

And then of course:  the disclaimer part ... Although I publish
everything I learn to all of you in order to share my .02, it will
allways be only my opinion only and the path I'm following does not have
to be followed by any of you. All the above is to enrich each of us with
the info I found, and you will use/abuse this at your own risk.