Nawkaw Corporation					March 1, 1991
2283 Argentia Road
Unit 23
Mississauga Road
L5N 5Z2

ACCELERATED WEATHERING TEST RESULTS
TEST CONDUCTED BY:  FRED PUGSLEY - B.Sc, M.Sc

Samples of wire cut bricks were prepared by Nawkaw in a size suitable
for fitting into the racks of the QUV.

Five duplicated 'tiles' were prepared with the Nawkaw colour treatment
by Nawkaws' Operations Manager.  One pair of tiles was not treated (to
act as controls).  The other four pairs were treated according to 
Nawkaws' normal operation where a white, yellow, red, and blue treatment
would be required.  The blue tiles were of a 'slate' colour indicating
that black as well as blue was included.

In this way the three primary colours plus black and white were tested.
A parallel set of duplicated tiles was prepared using opaque colours
on the cut side of the tiles since they were smoother.

The 10 tiles were divided into two sets.  One set was kept separate to
act as controls while the second set was tested in a QUV accelerated 
weatherometer with UVB-313 bulbs.  This provided a 16 hour UV plus 8
hour condensation cycle.  The tiles were tested with a Macbeth
colorimeter.  The readings were recorded as the difference in colour
readings between the control tile and the 'under-test' tile of the same
colour.

Similarly the other opaque coloured tiles were divided into control
and test groups and tested simultaneously in the same way as the
normally prepared tiles.

Using the ratio of hours in the QUV to the years exposure in Florida,
the test was designed for 25 years Florida exposure.

CONCLUSIONS

The Nawkaw colour treatment changes the appearance of the masonry
but leaves the pores open so that 'breathing' is maintained.  After
the 25 year test there was no perceptible difference in the colours
versus their controls when viewed at 25 feet.

The opaque tiles were originally designed with the pores closed due
to the thickness of the treated film.  This part of the experiment
was designed to show early failure due to peeling.  It was very
surprising that the quality of the treatment was so good that there
was not only no peeling but there was also no perceptible difference
in the colours versus their controls at 25 feet in the case of the
opaque tiles.



Fred Pugsley - B.Sc, M.Sc
Research Chemist