BSG nanostructure has appeared after mechanical cleavage of pyrolytic graphite. Mechanical valves are made from synthetic materials, such as titanium or pyrolytic carbon. MSRE's piping, core vat and structural components were made from Hastelloy-N, moderated by pyrolytic graphite. The residual lignin components currently serve for hydrolytic or pyrolytic conversion or just burning only. There are two primary methods in use&colon; pyrolytic chemical vapor deposition and magnetron sputtering. The absorption at surface has two possible ways, photolytic and pyrolytic. Box-shaped graphene (BSG) nanostructure appeared after mechanical cleavage of pyrolytic graphite has been reported recently. The mechanical valves are made from metal and pyrolytic carbon, and can last a lifetime. Pyrolytic graphite and pyrolytic carbon are often confused but are very different materials. Because of this, pyrolytic carbon exhibits several unusual anisotropic properties. Pyrolytic carbon coatings are used in many applications, including artificial heart valves. Smoke contains several carcinogenic pyrolytic products that bind to DNA and cause genetic mutations. Thermal pyrolytic conversion is used to produce charcoal, biogas and bio-oil. The pyrolytic graphite core, grade CGB, also served as the moderator. This method uses highly ordered pyrolytic graphite (HOPG) as the starting material.