Beryllium and OSHA by Daniel O. Chute, CIH, CSP, President, Atrium ... 3X lighter than aluminum. â ¢ 6X stiffer than steel. â ¢ Conducts heat well. â ¢ Dimensionally stable. â ¢ Transparent to X-Rays. â ¢ Reflects neutrons. â ¢ High melting point. Significant Code