Marcelinus Rangga

As a QC & R&D Supervisor at PT Rimba Partikel Indonesia, a manufacturer of particle board products, I lead quality control operations and product development initiatives to ensure compliance with internal standards and international regulations. I design and execute material and chemical trials to evaluate new raw materials, resin systems, and process modifications aimed at improving board performance, cost efficiency, and sustainability. My role includes analyzing physical and mechanical properties, optimizing production parameters, and driving product innovation aligned with market demands. In addition, I oversee labeling verification to ensure full compliance with company specifications and certification requirements such as Japanese Industrial Standards (JIS) and California Air Resources Board (CARB), ensuring that all products meet regulatory, safety, and export standards.

As a Physical Chemistry Laboratory Assistant specializing in computational chemistry, I mentored approximately 40 undergraduate students in applying quantum chemical calculations using ORCA. I guided them through constructing input files, selecting appropriate DFT and ab initio methods, performing geometry optimizations, and analyzing molecular interaction and binding energies. In addition, I trained students to extract vibrational frequency data and generate simulated FTIR spectra, helping them connect computational outputs with molecular structure and spectroscopic interpretation. Beyond technical instruction, I supported troubleshooting convergence errors, strengthened their analytical thinking, and fostered a deeper conceptual understanding of theoretical chemistry through hands-on computational practice.

During my internship at Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri (BBSPJPPI), I was responsible for conducting laboratory analyses of industrial waste samples to determine heavy metal content such as boron, arsenic, and mercury. I performed method verification for mercury detection using Cold Vapor Atomic Absorption Spectroscopy (CV-AAS) to ensure the accuracy and reliability of analytical results. This experience allowed me to strengthen my understanding of Good Laboratory Practice (GLP), data interpretation, and instrument calibration. Working alongside experienced analysts and environmental chemists, I developed strong analytical thinking, attention to detail, and a commitment to maintaining high-quality standards in every testing process.

I hold a Bachelor’s degree in Chemistry with a specialization in Physical Chemistry Laboratory, focusing on the fundamental principles of physical chemistry and their applications in research. Throughout my studies, I gained hands-on experience in operating physical chemistry instruments, conducting experimental data analysis, and applying computational chemistry methods to model molecular phenomena. My skills include utilizing computational chemistry software for simulations and property calculations, allowing me to integrate both experimental and theoretical approaches in solving chemical problems.