Pyrolytic Graphite—tubes for AAS and crucibles for decomposing

Beijing Great Wall International can produce all kinds of graphite tubes for use in all major Atomic Adsorption Spectroscopy (AAS) instruments. Also, they can produce furnace tubes to specification from customers' drawings or samples. Graphite tubes coated with pyrolytic graphite and totally made from pyrolytic graphite are available.

Pyrolytic graphite crucibles are made directly from pyrolytic hydro-carbon compounds at high temperature and low pressure under an inert atmosphere. They have the characteristics of high purity, a smooth surface, a compact structure, and limited permeability. They are also easy to clean and show a high resistance to both strong acids (HCl, HNO₃, HF, H₂SO₄) and bases (NaOH, KOH) except for perchloric acid (HClO₄) and sodium peroxide (Na₂O₂). Samples in crucibles are not contaminated when melted.

Pyrolytic graphite crucibles are used to decompose different ores and other materials with acids or alkalis. They are particularly suitable for the decomposition and purification of high purity materials or reagents. They can be used to substitute for crucibles made of platinum, gold, silver, nickel, quartz, corundum, or Teflon. They are available in 10, 20, 30, 40, 50 and 100 milliliter models.

The pyrolytic graphite tube for AAS won the National Scientific and Technologic Advance Award. The pyrolytic graphite crucibles won the National Scientific and Technological Advance Prize and the Brussels Eureka silver medal.