EI 02G001
CEMP-E
01 July 1997
Table 3-3. Summary of cushion material characteristics.
Name of
Description
Advantages
Disadvantages
Material
Wire Rope
Wire rope coiled into flat
Inexpensive; material
Material hardens rapidly into steel
Biscuits
biscuits, then placed into
plentiful on job site.
mass; extensive hammer and pile
cushion receptacle.
damage possible.
Force Ten
Wires braided into steel
Long life
Material hardness rapidly into steel
cloth plates.
mass; extensive hammer and pile
damage possible.
Micarta and
Phenolic plates alternated
Long life; versatile, can be
Material too hard to be used with
Aluminum;
with aluminum plates.
used with many hammers.
some hammers.
Conbest
Aluminum plates used for
heat dissipation, frequently
omitted with diesel hammers.
Hamortex
Aluminum foil bonded with
Excellent range of
Inconsistent life; varies widely from job
various plastic and paper
elasticity moduli. Can be
to job.
materials and spirally wound
used as concrete pile
into disks.
cushion as well as
hammer cushion.
MC-904/Blue
Type of nylon, cast into discs.
Excellent range of
Material breaks up and melts easily
Nylon
Sometimes alternated with
elasticity moduli.
under hard conditions; best suited for
aluminum for heat
diesel hammers.
Plywood
Plywood sheets stacked and
Inexpensive and soft.
Poor coefficient of restitution; absorbs
mounted onto concrete pile;
much impact energy.
used almost exclusively as a
pile cushion.
End grain
Wood cut to use in cushion
Good range of modulus of
Low coefficient of restitution;
hardwood (oak,
receptacle as single block or
elasticity.
sometimes expensive and hard to find;
hickory,
into blocks which are then fit
burns during use.
bongossi, etc.)
into receptacle.
3-26
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