Isostatic Press Assemblies and Rubber Products
Polyurethane Bags with T-Plugs showing durometers; 65 (Blue) 50 (Yellow) 30 (Red)

Polyurethane Isostatic Molds


Trexler Rubber specializes in the design and production of custom bag sizes and shapes.
We also offer an extensive inventory of standard sized cylindrical bags from 19" to 36" tall, with 3/8" walls and inside diameters from 1/2" to 18", and in 30, 50, 65, and 85 Durometer.

Standard polyurethane bag sizes


Polyurethane Isostatic Molding Diagram







Solid Polyurethane Plug

3" standard height. The plug diameter matches to the mold's inside diameter for a tight seal. A de-airing tube (above) and/or an alignment hole (below) are available.

Solid polyurethane plug options
















Pressing Mandrel

A steel mandrel is optional, with centering pins available.



Polyurethane Bag

19" or 36" standard interior heights. 2" standard base thickness. 3/8" standard wall thickness.

Standard sizes

Custom sizes and options


Alignment Hole

Used to center the pressing mandrel. This feature is optional at no cost; please provide specifications. 1" standard diameter. 3/4" standard depth. Other sizes are available.



Polyurethane Bag with Outside Neck and Steel Container with Flange

Polyurethane Bag with outside neck
and Steel Container w/flange

Polyurethane Bag Assembly, Bag, Closure with Tube, Container, and  Seal Ring with Bottom

Polyurethane Bag Assembly, Bag, Closure with
Tube, Container, and Seal Ring with Bottom

Polyurethane Parts Showing Coloration of Our Durometers

Polyurethane Parts Showing Coloration
of Our Durometers

Polyurethane Bag Assembly: Container, Bag, Powder Fill Funnel, and Urethane Donut Closure with Groove and Tube

Polyurethane Bag Assembly: Container, Bag,
Powder Fill Funnel, and Urethane Donut
Closure with Groove and Tube

Polyurethane Dry Press Sleeves

Polyurethane Dry Press Sleeves