Fig. 4. Variation of Melt Flow Index with Respect to Percentage of Foam in LLDPE
3.2 Impact Strength
Impact tests were performed at room temperature on rotomolded parts in order to evaluate their ability to
absorb energy. Impact specimens are prepared as per the ASTM D256. The specimen dimension being 63 x 3 x 12.7
mm for impact.Impact tests were performed in typical Izod impact testing machine. A pendulum of maximum
energy capacity of 4 J was used to evaluate the energy absorption ability of the material. To account for process
variability during experimentation, three replications were taken for each experimental run. Thus three samples of
impact specimens were cut and subjected to testing.
The results of impact testing are as shown in Fig 5. These results reveal that impact strength gradually increase as