Overview
Medium-temperature pitch is a byproduct of coal tar or petroleum distillation, processed at intermediate temperatures (typically 250-350°C). It serves as a crucial industrial material with both solid and liquid forms available. The Chinese standard (GB/T) specifies quality parameters including softening point, ash content, and toluene insolubles. In industrial contexts, medium-temperature pitch is valued for its balanced properties between softness and thermal stability. It's distinct from high-temperature pitch (harder) and low-temperature pitch (more viscous), making it suitable for applications requiring moderate heat resistance and workability.
Physical and Chemical Properties
Medium-temperature pitch exhibits thermoplastic behavior, softening when heated and hardening upon cooling. Its viscosity varies significantly with temperature, requiring careful handling during application. Typical samples show a carbon content of 90-95% and contain complex polycyclic aromatic hydrocarbons (PAHs). Key measurable properties include the softening point (Ring & Ball method, usually 70-90°C for standard grades) and quinoline insolubles (QI) content. The material is chemically stable at room temperature but may oxidize when exposed to air at elevated temperatures, affecting performance in long-term applications.
Main Applications
The primary use of medium-temperature pitch is in aluminum smelting, where it binds petroleum coke to form carbon anodes. Its adhesive properties and high carbon yield make it indispensable for this energy-intensive process. Approximately 60% of global production serves the metallurgical industry. Secondary applications include roofing and waterproofing membranes, where its water resistance is leveraged. In refractory production, it acts as a binder for magnesia and alumina bricks. Emerging uses include carbon fiber production and specialty graphite manufacturing, though these require higher purity grades.
Safety and Storage
As a combustible material, medium-temperature pitch requires storage away from open flames and heat sources. Solid form should be stacked with adequate ventilation to prevent fume accumulation. Liquid pitch tanks need temperature control systems to maintain optimal viscosity for pumping. Personal protective equipment (PPE) including heat-resistant gloves and eye protection is mandatory during handling. The material may release hazardous PAHs when heated above 200°C, necessitating local exhaust ventilation in processing areas. Spills should be contained with inert absorbents rather than water, which can cause splattering of hot material.
B2B Procurement Guide
Industrial buyers should specify technical parameters including softening point (typically 75-95°C for standard grades), ash content (<0.5% for electrode-grade), and beta resin content (indicator of binding properties). Bulk shipments usually occur in molten form via heated tankers or solid form in 25kg bags. Quality verification should include third-party testing for key parameters, especially when used in electrode manufacturing. Long-term contracts with price adjustment clauses are common due to volatility in petroleum feedstock costs. Consider supplier capability to provide consistent quality across batches, as variations can impact downstream production processes.
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