Don Teach advises the use of pillow ticking for replacement of hinge
material.  I have used this material for many years.  Don's response
was to a specific application given in response to a question posted
on MMD.  I would like to comment on general applications.

Apart from exceptions, such as Simplex pneumatics, there are two types
of key pneumatics.  The first are those which have a notch at the hinge
end of the wood.  This notch serves the purpose of allowing the
pneumatic cloth to fold in along the side at the hinged end.  In this
case, such as in Ampico A pneumatics, a hinge may be made out of thin
material such as pneumatic cloth.

The second type of key pneumatics do not have a notch at the hinged end
and so some allowance must be made to for the pneumatic cloth to fold
in at the hinged end.  In this case a thick cloth is chosen to create
a "gap" between the two pneumatic boards at the hinged end so that the
cloth may fold in on the sides near the hinge.

Some restorers may wish to find exact replacement cloth for the hinge
material.  I believe that many manufactures purchased remnants for
their hinges.  Although I do not have proof positive from factory
records, I have seen many hinges made from white cloth with thin blue
stripes.  No doubt this material was left over from the process of the
manufacturing of mattresses.

When I replace hinges I think about the purpose the hinge serves and
I replace the hinge with appropriate material.  I use ticking for
pneumatics with no reliefs, and pneumatic cloth or cotton sheet cloth
for those with relieved leaves.  Pneumatic cloth hinges are neat to
work with because the applied glue does not seep through the cloth.

Paul Manganaro