Palram PALSU - Manual (Page 6)

6
Impact Strength
PALSUN sheets are manufactured from polycarbonate, the
most versatile, toughest transparent thermoplastic. PALSUN
has 200 times the impact strength of glass, offering excellent
protection against riots and public disturbances, breaking &
entering or acts of vandalism.
PALSUN can endure attacks by rocks, clubs, hammers and
thrown objects, and still to retain its original shape, maintain
its integrity with minimal indentations to its surface.
The amount of damage depends on the object mass and
energy, and sheet’s thickness. PALSUN sheets will retain these
energy-absorbing properties over a wide temperature range
(50° to + 100° C).
Typical impact failure energy of PALSUN® sheets*
Thickness
mm
Energy at Failure
E
50
(Jouls)
Type of Failure
2 110 100% ductile
3 150 100% ductile
4 190 100% ductile
5 290 100% ductile
6 400 100% ductile
8 - 18 N.B.** N.B.**
* According to ISO 6603/1 1985(E): Determination of multi-axial impact behavior
of rigid plastics.
Legend
1. Leveled floor
2. Stablized base
3. Supporting guidrails
4. Lifting mechanism
5. Disengagement mechanism
6. Guidance bar
7. Changeable weight
8. 20 mm diameter head falling dart
9. Tested specimen
10. Calibration bar
11. Changeable drop height
Falling Dart Method
A uniform energy increment is employed during testing. Energy is decreased or increased by uniform increment after testing
each specimen, depending upon the result (failed / not failed) observed for the former tested sample. A 20 mm diameter dart,
weighing 8 kg, with a rounded tip, is raised to a certain height and released to fall on a suitably sized sample.
Principles: Impact strength is determined by the known weight and height. Adjustment is done by altering height while using a
constant mass.
E50: 50% of Impact Failure Energy. The energy that will cause 50% of the tested samples to fail.
N.B.**: No Break. The energy required to break the sample is greater than what the test instrument can deliver.
Falling Dart Impact Testing Device (Schematic Figure)