Physical Properties

Density (lbs./ft3).............................................................................................15-20lbs
Compression Set %
Room Temperature (Dry, 73°F) .............................................................................<2
Elevated Temperature (Dry, 158°F) .....................................................................<10
After Hydrolysis (autoclaved at 250°F) ...................................................................<5
Compression Force Deflection
25% Deflection, PSI .................................................................................................7
50% Deflection, PSI ...............................................................................................13
Tensile Strength
PSI Min ............................................................................................................78-94
Elongation
% Min .......................................................................................................100 - 119%

Corrosion Resistance

Excellent (AMS 3568)

Test Methods

• ASTM D 1667 (25% compressionfor 22 hrs. @ 73°F, 24 hrs. recovery)
  
• ASTM D 3574 (50% compression for 22 hrs. @ 158°F, 1/2 hr. recovery)
  
• ASTM D 3574 (after 5 hrs. of autoclaving @ 250°F, 1/2 hr. recovery)
  
• .025+” thick specimens tested on an Instron @ 0.2 in./minute strain rate
  
• ASTM die No. 1564 run @ 20”/min
  

NOTE: The above data represent nominal values and may vary with thickness.

The performance data contained herein are based on standard laboratory tests. Since the test conditions cannot always duplicate actual end use, Langer, Inc. makes no warranties with regard to such data, and assumes no responsibility for performance characteristics resulting from conditions which differ from those used in laboratory tests.

The user should make his own tests to determine the suitability of this product for his intended use.

Durometer
13-21 Shore “O” 9-14 Shore “A”

Bonding

All common orthotic materials can be bonded to PPT. When using Polyolefin plastics, surface roughing of the plastic, a common practice, is recommended. As always, read and understand the label directions of the cement you use, with special attention to drying time.

If you are using non-abraded PPT, it may be helpful to rough the surface slightly with sandpaper before applying the adhesive.

PPT is easily cut with scissors to produce a finished look. Thicker material, 1/4” or more, can also be rough cut on a band saw.

Chemical Resistance

PPT is unaffected by mild inorganic acids and bases. It shows modest swelling with oils, greases, and other linear hydrocarbons. In most cases, physical properties recover to a great extent as the solvents evaporate.