National Standard Medium-Temperature Coal Tar Pitch

National Standard Medium-Temperature Coal Pitch No. 1

Softening point: 80-95°C

Ash content: ≤0.3%

Toluene insoluble: 20-30%

Quinoline insoluble: 5-12%

Coking value: ≥48%

Fixed carbon: ≥38%

Moisture: ≤3%

Product form: Granular, lump

National Standard Medium-Temperature Coal Pitch No. 2

Softening point: 85-93°C

Ash content: ≤0.3%

Toluene insoluble: 20-30%

Quinoline insoluble: 15-25%

Coking value: ≥48%

Fixed carbon: ≥38%

Volatile matter: 50-65%

Moisture: ≤3%

Product form: Granular, lump

I. Characteristics of Medium-Temperature Pitch

Medium-temperature pitch is a specially processed asphalt material that exhibits good adhesion and flexibility at medium temperatures, maintaining excellent workability at lower temperatures. Compared to high-temperature pitch, medium-temperature pitch has lower viscosity, making it easier to mix and stir, while its flexibility allows it to adapt to significant temperature variations.

II. Applications of Medium-Temperature Pitch

Due to its unique properties, medium-temperature pitch is widely used in construction, road engineering, waterproofing, and other fields. It can be applied to waterproofing layers for roofs and walls, effectively preventing water penetration. In road engineering, medium-temperature pitch serves as a tack coat oil, enhancing the bond between pavement layers and improving durability and stability.

III. Differences Between Medium-Temperature Pitch and Other Asphalt Materials

Medium-temperature pitch differs significantly from high-temperature and low-temperature pitches. High-temperature pitch has higher viscosity and poorer flexibility, making it prone to hardening and difficult to work with in high-temperature environments. Low-temperature pitch, on the other hand, becomes brittle at low temperatures and cannot withstand significant temperature changes, limiting its applicability. Medium-temperature pitch combines the advantages of both, maintaining good workability at lower temperatures while offering excellent durability and aging resistance, making it suitable for various environmental conditions.

IV. Construction Precautions for Medium-Temperature Pitch

During construction, the following points should be noted: First, ensure the quality of the medium-temperature pitch, as selecting high-quality materials is essential for construction quality. Second, control the construction temperature carefully, as the adhesion and flexibility of medium-temperature pitch are temperature-dependent, so an appropriate working temperature must be chosen. Third, strictly regulate the mixing time and temperature to ensure the uniformity and stability of the medium-temperature pitch mixture. Finally, perform proper post-construction maintenance to prevent moisture and impurities from infiltrating, thereby extending the service life of the medium-temperature pitch.