Calgon Carbon Corp., of Pittsburgh, has developed WaveZorb, a new easy-to-use carbon cloth product that blocks up to 99 percent of the microwaves via cellular phones that contact the WaveZorb. Transmission and reception of cellular or cordless phone signals are unaffected, so performance isn’t diminished. It’s estimated that over 100 million Americans use cellular phones. This is the first direct consumer product commercialized by Calgon Carbon.