Coal tar-based sealant refers to a type of sealant commonly used to coat and protect asphalt surfaces, such as driveways, parking lots, and roads. It is derived from coal tar, which is a thick, black, and sticky liquid produced during the process of turning coal into coke or coal gas.

Key characteristics of coal tar-based sealants include:

1. Waterproofing: Coal tar-based sealants are excellent waterproofing agents. They form a protective layer over the asphalt surface, preventing water from seeping into the pavement, which helps to extend the life of the asphalt.

2. UV Protection: These sealants offer good resistance to ultraviolet (UV) radiation, which is crucial in protecting the underlying asphalt from sun damage and oxidation.

3. Durability: When properly applied, coal tar-based sealants can provide a durable surface that can withstand the stresses of vehicle traffic and harsh weather conditions.

4. Enhanced Appearance: The sealant gives the asphalt a dark, rich, and glossy appearance, enhancing the overall aesthetic appeal of the pavement.

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However, it's important to note that coal tar-based sealants have raised environmental and health concerns. They contain polycyclic aromatic hydrocarbons (PAHs), which are toxic substances known to have harmful effects on aquatic life and humans. Runoff from seal-coated surfaces can contaminate water bodies and contribute to environmental pollution. Consequently, several states and municipalities have restricted or banned the use of coal tar-based sealants in an effort to protect the environment and public health.

As an alternative, many asphalt sealant manufacturers have shifted to asphalt-based sealants or other eco-friendly options that do not contain coal tar or harmful PAHs. If you are considering using a sealant for your asphalt surface, it is essential to check the local regulations and opt for environmentally friendly products that comply with current standards.