We've traditionally said 5% is a de minimis hazardous concentration. Does anybody know what this might be - a concentration of HF below which it becomes relatively "non-hazardous"? Gordon Miller Lawrence Livermore National Laboratory P.O. Box 808 (L-379) Livermore, California 94550 (925) 423-8036 Fax (925) 422-5176 miller22**At_Symbol_Here**llnl.gov
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