Polypropylene (Polypro) Sheet for O&P is Widely Used For:

  • Body jackets
  • Upper & lower extremity orthoses
  • AFOs
  • Rigid, outer prosthetic sockets

Performance Characteristics:

  • Rigid
  • Excellent formability
  • Stress & crack resistance
  • Excellent durability

Common Brands:

  • Orthoform®
  • Polystone®
  • ProComp®


Low cost, chemical resistant plastic with excellent aesthetic qualities

Polypropylene is a low cost, chemical resistant plastic with excellent aesthetic qualities. It is easy to weld using thermoplastic welding equipment and is often fabricated into water and chemical tanks.

Polypropylene used in the manufacturing of upper and lower extremity orthoses and prosthetics offers the O&P fabricator a material that is easy to drape, blister form and seam. Polypropylene is easy to decorate with transfer patterns for O&P applications. FDA compliant polypropylene grades are available.

Polypropylene is available in homopolymer, carbon reinforced homopolymer, and copolymer grades. 

Shop for Polypropylene


48 in x 96 in
0.062 in – 4 in
O&P SHEET Dimensions:
12 in x 12 in – 48 in x 96 in
0.030 in – 0.750 in
PROCOMP® Dimensions:
16 in x 16 in – 48 in x 96 in
0.125 in – 0.500 in
INDUSTRIAL ROD Outside Diameter:
0.250 in – 14 in
COLOR Industrial Sheet:
Natural, Black, White

O&P Sheet:
Natural, Black, White, Brown, Flesh, Blue, Pink, Purple, Red, Silver, Neon Green, Neon Pink, Royal Blue

ProComp™: Natural
GRADES FDA Compliant, Heat Stabilized, Medical, Carbon Reinforced

Length, width, thickness, and diameter tolerances vary by size, by manufacturer, brand, and grade. Custom sizes and colors available upon request.

Polypropylene Properties and Material Options

Homopolymer Polypropylene (Polypro)– Homopolymer polypropylene is stronger and stiffer than copolymer. It is a very durable, rigid plastic available in natural (a translucent white) and a variety of colors. Easily formed, polypropylene is widely used for body jackets, upper and lower extremity orthoses (especially AFO’s), and rigid outer prosthetic sockets.

Copolymer Polypropylene (Copoly PP)– Copolymer polypropylene is a bit softer, but it is tougher and more durable than homopolymer polypropylene. Copolymer polypropylene tends to have better stress crack resistance and low temperature toughness than homopolymer polypropylene. Used in many of the same applications as homopolymer polypropylene, but where slightly more flexibility is needed.

ProComp® (Carbon reinforced polypropylene)– is a patented high-pressure laminated prepreg composite that is available in stable sheet form. The proprietary composite manufacturing process infuses high strength carbon fibers into the structure of the hybrid laminate. The patient is thus protected from dermal contact with the carbon fibers as the surfaces of the laminate are void of carbon fibers. The high-pressure laminated prepreg composite is comprised of layers of a thermoplastic resin and carbon fiber, and is compatible with post-delivery adjustments to the clinical device without a decrease in structural integrity of the composite.

The advanced proprietary high-pressure lamination process allows the ultra-light carbon composite to be compatible with standard vacuum drape and bubble forming techniques commonly used for the custom fabrication of lower limb orthoses and prosthetic sockets.

ProComp® offers financial and clinical, and fabrication advantages to Orthotic and Prosthetic practices.

Tech Tip For O&P Fabricators– Homopolymer recommended oven temperatures are 325°F to 350°F.
Copolymer recommended oven temperatures are 300°F to 350°F.


Typical Properties OF Polypropylene
Tensile strength psi D638 5,400 3,800
Flexural modulus psi D790 225,000 215,000
Izod impact (notched) ft-lbs/in of notch D256 1.2 12.5
Heat deflection temperature
@ 264 psi
°F D648 210 190
Maximum continuous service
temperature in air
°F   - -
Water absorption
(immersion 24 hours)
% D570 slight slight
Coefficient of linear thermal
in/in/°Fx10-5 D696 - -

Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.

Explore the physical, mechanical, thermal, electrical, and optical properties of polypropylene.

Sort, compare, and find the plastic material suited for your application using our interactive properties table.

ProComp® composite thermoplastic resin-fiber materials are sold under license from, and are a product of, Rhode 401, LLC.