The effect of incubation period and the presence of organic membrane
on eggshell activity toward elastomers (NBR, NR and SBR) has been investigated.
After hatching eggshell (AHES) showed enhanced mechanical properties when
compared to before hatching eggshell (BHES) and calcium carbonate. Compounds
containing BHES powder also showed good mechanical properties. Both types of
eggshells reduced optimum curing time of the compounds. This trend was more
considerable in NBR compound. The improvement of mechanical properties of the
compounds attributed to elemental composition and higher specific area of AHES.
The results of this study showed both before hatching and after hatching eggshell
can be used in elastomeric compound as a bio-filler.