The limiting oxygen index
(LOI) technique can provide a quantitative measurement on the flammability of polymers.
Melt flow rate, g/10 min 20 25 Tensile strength, MPa Yield 61.3 57.9 Break 55.2 45.5 Tensile modulus, GPa 2.4 2.4 Elongation [at] break, % 95 20 Flexural strength, MPa 95.8 91.7 Flexural modulus, GPa 2.3 2.8 Notched Izod impact strength, J/m 636 530 Deflection temperature, [degrees] C[at]1.82MPa 123 90 Vicat softening point, [degrees] C 151 116 UL-94 classification 1.6 mm V-0 V-0 3.2 mm V-0/5V V-0/5V Limiting oxygen index
, % 38 28
Moreover, the synergistic flame retardant effects between AFP and LDH in EVA/ LDH/APP composites were studied using limiting oxygen index
In general, both the limiting oxygen index
and UL 94 performance of filled and unfilled polyolefins seems to improve with SFR-100 resin due to the silicone's char-formation characteristics.
Limiting oxygen index
(LOI) was measured according lo ASTM D 2863.
Furthermore, the compounds with such mixed filler systems exhibit greater ignition resistance in the UL-94 horizontal burn tests and higher limiting oxygen index
In this work, the effects of [TiO.sub.2] and LDH on the flame retardant and thermal properties of the EVA/LDH/[TiO.sub.2] composites have been studied using limiting oxygen index
(LOI), UL-94 tests, cone calorimeter (CCT), and thermal analysis (TGA).
Since the horizontal flammability test was not sufficient to show the flame retardancy of composites, the limiting oxygen index
(LOI) test for the samples was also involved.
Test specimens for limiting oxygen index
(LOI) measurements (130 X 6.5 X 3.25 m[m.sup.3]) and vertical burning tests (130 X 13 X 3.25 m[m.sup.3]) were shaped by compression molding to final dimensions in accord with the relevant standards, i.e..