LAKASABrowsing by Author "Lacuata, Shaira Jane F."

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Development of oyster (Ostreidae) shells as chalk
(Don Mariano Marcos Memorial State University – Mid La Union Campus, 2023-05) Lacuata, Shaira Jane F.; Gatchallan, Sherilly G.; Peralta, Hanna Sophia C.; Rimpillo, Ronalyn R.; Gacayan, Daniel B.; Bayani, Keneth G.; Javonitalla, Josephine G.; Hufana, Zhelyn A.; Quinitip, Tiffany Ruth R.
Oyster shell is a type of sea shell that has naturally occurring component of calcium carbonate, that is primarily used in making chalk. This study aimed to: standardize the formulation and process, determine the junctional attributes, microstructural qualities, and production cost of developed oyster shell chalk. The research design used were: Researchers used experimental method for the standardized formulation of oyster shells as chalk, in which researchers performed six different trials, and a descriptive study design is used for functional attributes of the oyster shell chalk for median computation. Treatment 2 has the highest median while Treatment 1 has the lowest median. The oyster shell chalk has a mean breaking strength of 10.3 N (load of 1.05 kg) and standard deviation of 2.84 N (load of 0.290 kg), ranges 11 mm in diameter and 84.1 mm long. The total production cost is comparable with the leading brands.