Soldering temperature torch or a furnace to melt the filler metal. Different equipment is usually required since a soldering iron cannot achieve high enough temperatures for hard soldering or brazing. Brazing filler metal is stronger than silver solder, which is stronger than lead-based soft solder. Brazing solders are formulated primarily for strength, silver solder is used by jewelers to protect the precious metal and by machinists and refrigeration technicians for its tensile strength but lower melting temperature than brazing, and the primary benefit of soft solder is the low temperature used (to prevent heat damage to electronic components and insulation). Since
C-rich stability element been mapped to a pyrimidine-rich segment of its 3' UTR. This region confers stability by directing the assembly of a specific alpha ribonucleoprotein complex at this site. Subsequently Holcik and Liebhaber identified three other highly stable eukaryotic mRNAs that assemble the alpha globin protein complex at homologous pyrimidine-rich regions within their 3'UTRs (rabbit lipoxygenase, rat tyrosine hydroxylase, and human alpha(I)-collagen). There is some debate as to the number and identity of trans-acting factors recruited to the C-rich element. However the alpha globin poly(C)-binding protein (alphaCP) is agreed to be the core constituent of what is known as the alpha complex.