Product Overview

Boli Technology's graphite crucibles are high-performance melting vessels engineered for the rigorous demands of precious metal processing and industrial smelting. Manufactured from high-purity graphite materials with densities reaching up to 1.90 g/cm³, our crucibles are designed to deliver exceptional thermal performance, longevity, and reliability in both laboratory and production environments.

These crucibles are ideal for melting a wide range of metals, including gold, silver, platinum, copper, aluminum, and various alloys. Available in capacities from 1kg to 8kg and beyond, with custom sizing options.

Technical Specifications

Key Features & Benefits

• Superior Thermal Shock Resistance: Our crucibles are formulated to withstand rapid and extreme temperature changes without cracking, ensuring a long and reliable service life.

• Excellent Thermal & Electrical Conductivity: The high thermal conductivity of graphite ensures rapid and uniform heating, which significantly shortens melting times and improves energy efficiency.

• High-Temperature Stability: Engineered to maintain structural integrity and resist oxidation even at continuous operating temperatures up to 1800°C.

• Chemical Inertness & Corrosion Resistance: Graphite is highly resistant to chemical attack from acids, alkalis, and molten metals, preventing contamination and ensuring the purity of your melt.

• High Purity & Low Ash Content: Our high-purity graphite (ash content ≤0.1%) minimizes the risk of introducing impurities into your precious metals, making it ideal for critical applications.

• Long Service Life: The combination of high density, strength, and thermal properties results in a crucible that delivers a high number of melts, reducing your overall operating costs.

Applications

• Precious metal melting, smelting, and refining (gold, silver, platinum)

• Jewelry manufacturing and casting

• Laboratory analysis and cupellation

• Metallurgical and foundry operations

• Melting of non-ferrous metals like copper and aluminum

Alumina Crucibles

Product Overview

For applications demanding the highest levels of chemical purity and resistance, Boli Technology offers premium alumina (Al₂O₃) crucibles. Manufactured from 99.7% to 99.8% pure aluminum oxide, these crucibles provide an inert, contamination-free environment for the most sensitive high-temperature processes.

Technical Specifications

Key Features & Benefits

• Ultra-High Purity: The 99.7%+ alumina composition ensures no unwanted reactions or contamination, making it the preferred choice for analytical chemistry and high-purity metal processing-.

• Exceptional Chemical Stability: Alumina crucibles are virtually inert and offer outstanding resistance to chemical attack from a wide range of fluxes, slags, and molten metals.

• Excellent High-Temperature Strength: Maintains its mechanical strength and shape at extreme temperatures up to 1750°C, ensuring dimensional stability during demanding processes.

• Thermal Shock Resistance: Designed to endure rapid temperature changes, though controlled heating and cooling are recommended to maximize lifespan.

Applications

• High-temperature analytical chemistry and assaying

• Firing and sintering of advanced ceramics

• Melting and processing of refractory and precious metals (e.g., platinum, rhodium)

• Quality control and R&D laboratories

• Glass melting and other high-purity industrial processes

Operating & Maintenance Tips

To maximize the performance and service life of your Boli Technology crucibles, please observe the following guidelines:

• Storage: Store crucibles in a dry environment to prevent moisture absorption, which can lead to cracking upon heating.

• Pre-heating: Before first use or after being in a humid environment, slowly pre-heat the crucible to 500°C in a drying oven or near the furnace to remove any moisture.

• Loading: Do not overfill the crucible. Always respect the recommended capacity to allow for thermal expansion of the metal and prevent damage.

• Placement: Center the crucible in the furnace and ensure it sits flat on the furnace floor. Avoid direct flame impingement on the crucible body.

• Handling: Always use crucible tongs that match the shape of the crucible to avoid point-loading and stress fractures.

• Maintenance: Regularly clean the crucible gently to remove slag and buildup. Rotating the crucible periodically can help extend its service life.