21. Understanding such properties is essential to making quality zirconium hydride. 22. Only a few percent of hydrogen can dissolve in zirconium . 23. Zirconium silicates have also been studied for potential use in medical applications.24. Some parts of nozzles are covered by zirconium dioxide for thermal protection. 25. Tellurium is released with the progress of zirconium telluride decomposition. 26. These include hafnium diboride, zirconium diboride, and some similar materials. 27. Zirconium free from hafnium is required for nuclear reactor construction.28. Typical materials that are welded include titanium, beryllium, and zirconium . 29. What were such men doing selling zirconium to Iraq? 30. The company also pleaded guilty to illegal exports of weapons-grade zirconium .