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 The
part pictured is a medium frequency
vibratory feeder trough made of SS304. It is used to
convey nails into a packaging line. This and other vibratory
feeders in the packaging line generated enough noise
to cause complaints from a shipping department, which
was 75 feet away. The ringing was so bad that it made
it difficult to talk on the phone or hear the overhead
paging system, which has plenty of volume on its own.
Two coats of Acoustical Solutions’ Sound Damping
Compound VBD-10
were applied with an aspirating type of compressed air
supply. A quart of water was added to each 5-gallon
pail to thin it for air application. The first coat
dried enough in 4 hours to allow us to apply the second
coat (even in summer humidity). The next day, production
was run on the line with a substantial reduction in
noise...most evident by elimination of the high frequency
ringing of the metal trays. Other non-moving metal parts
were sprayed as well, in effect damping
sound, which reached these surfaces. 
Concerned with the fire-retardency of the product, we
tried to ignite it on a piece of 1/16" steel after
it was dry. It was very resistant to supporting flame,
and even when the steel was very hot, and the burner
flame removed, the surface rendered only a small amount
of smoke and for a very short period of time and was
not particularly objectionable.
We were very happy with the results of the product
and will be applying more to various surfaces during
our plant shutdown this summer.
Jim Loveland, Plant Manager
Maze Nails
Peru, Illinois
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