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Methyl Bromide - Voluntary Label Changes 4/92

METHYL BROMIDE STRUCTURAL FUMIGATION LABEL CHANGES NOTED

     Methyl bromide registrants last week voluntarily agreed to label changes
for products used in structural fumigation, following determinations by EPA
and the Department of Pesticide Regulation, California EPA (Cal-EPA), that
there were health risks, acute and chronic, from reentering structures after
fumigation.  The voluntary label changes delay reentry and require aeration.

     The interim voluntary label changes agreed to by Great Lakes Chemical
Corp., Ethyl Corp. and Ameribrom, Inc., are:

          -- After fumigation occurs and the tarp is removed,
             all doors and windows must be opened and all plates
             from light switches and electrical outlets must be
             removed.  The structure may not be certified for
             reoccupancy until one of the following criteria is met:

             1.  For natural ventilation.  A.  Minimum of seven
                 days.  B.  Minimum of two samples, measurement
                 less than 3 p.p.m. C. Repeat measurements after
                 24 hours if test fails.

             2.  Structures without attics.  A.  Aeration fan in
                 living area with 10,000 CFM capacity for 72 hours.
                 B.  Minimum of two samples, measurement less than
                 3 p.p.m.  C.  Repeat measurements after 12 hours
                 if test fails.

             3.  Structures with attics.  A.  Aeration fan in attic
                 with 10,000 CFM capacity for 72 hours.  B.  Minimum
                 two samples, measurement less than 3 p.p.m.
                 C.  Repeat measurements after 12 hours if test fails.

             4.  A.  Aeration fan in basement with 10,000 CFM capacity
                 for 72 hours.  B.  Minimum two samples, measurement
                 less than 3 p.p.m.  C.  Repeat measurements after 12
                 hours if test fails.'

     DowElanco's Vikane, sulfuryl fluoride, is a methyl bromide alternative.
Vikane label changes were filed with EPA in 1991 by DowElanco but the changes
were not acted on, an agency official said last week.

     In an April 3 press release, EPA said it was 'approving some label
changes proposed by the registrant of sulfuryl fluoride which will increase
requirements for post-treatment clearance activities and reduce potential
exposure levels before residents reenter treated dwellings.'

     --April 8, 1992 PESTICIDE & TOXIC CHEMICAL NEWS