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Depending on your particular needs, CALIBRE*
polycarbonate resins are available with UV stabilizers.
In fact, CALIBRE resins are excellent materials
for molded parts requiring a high degree of resistance to
UV light from either indoor or outdoor sources. CALIBRE
resins without UV stabilizers pass the accelerated indoor
colorfast tests described by ASTM D 4459, which simulate
a three- to five-year exposure in an indoor office environment.
In CALIBRE resins tested under these conditions,
the change in color as measured by Delta E is typically
less than 2 units.
For parts exposed to outdoor environments,
CALIBRE polycarbonate resins are available
with enhanced weathering resistance. These resins are
designated by a 2 or 3 in the last digit of the product
identification code (i.e., 302 15 MFR or 703 15 MFR).
Our UV-stabilized formulations can greatly extend retention
of the key physical properties of CALIBRE
resins. The data in the following table show the performance of CALIBRE
300 6 MFR resins (with and without UV stabilizers), exposed
in Arizona at a 45¡Æ angle facing south. This two-year
exposure normally correlates with approximately five years
of typical service. Similar data were obtained in Florida
exposures. The data in the chart indicate the superior
exterior performance of CALIBRE polycarbonate
resins with UV stabilizers.
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| Arizona Outdoor Exposure, CALIBRE 300 Series
Resins |
CALIBRE
Resin |
Time |
Izod
Impact,
ft-lb/in |
%T |
%
Haze |
YI
Increase |
300 6 MFR
without
UV
stabilizer |
0
6 months
1 year
2 years |
17.6
17.9
1.2
0.6 |
89.4
85.8
84.7
82.3 |
1.7
8.2
12.7
19.8 |
0
+12.3
+15.7
+20.0 |
300 6 MFR
with
UV
stabilizer |
0
6 months
1 year
2 years |
18.2
17.9
17.7
18.5 |
89.6
88.4
88.5
87.3 |
1.6
6.8
9.0
14.8 |
0
+2.3
+3.3
+6.1 |
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"*" Trademark of the Dow Chemical Company, licensed for use by LG DOW
Polycarbonate LTD.
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