Tar oils, also known as coal tar pitch or simply coal tar, are complex mixtures of hydrocarbons derived from the distillation of coal. They are dark, viscous liquids that contain a variety of chemical compounds, including polycyclic aromatic hydrocarbons (PAHs), which are known for their potential carcinogenic properties. Tar oils have been historically used in the production of roofing materials, road construction, and as a component in various industrial applications. However, due to health and environmental concerns, their use has been significantly reduced in many countries. Despite this, they still find applications in certain specialized areas, such as in the production of chemicals and as a sealant for metal surfaces.
The CAS Registry Mumber 8002-29-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 8,0,0 and 2 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 8002-29: (6*8)+(5*0)+(4*0)+(3*2)+(2*2)+(1*9)=67 67 % 10 = 7 So 8002-29-7 is a valid CAS Registry Number.