EVA

EVA is Widely Used For:

  • Soft inner liners for rigid socket frames
  • Inner boots for pediatric AFOs
  • Orthotics for hand and wrist
    Upper and lower extremity prostheses

Performance Characteristics:

  • Excellent moldability
  • Lightweight
  • Impact resistant

Common Brands:

  • OP-TEK® Flex
  • Orfitrans™ Excel
  • Proflex

EVA

Soft, flexible plastic with low-temperature toughness and stress-crack resistance

Flexible EVA (ethylene vinyl acetate) is the copolymer of ethylene and vinyl acetate. It’s an extremely elastic material that can be processed like other thermoplastics. The material has low-temperature toughness, stress-crack and UV radiation resistance. In the Orthotics and Prosthetic market, fabricators know this material as either: OP-TEK® Flex, Proflex, or Orfitrans™ Excel. (Note: Each brand may exhibit slight variations of grades and flexibility.)

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STANDARD SIZES
OP-TEK® Flex Dimensions:
12 in x 12 in – 48 in x 96 in
Thickness:
0.062 in – 0.625 in
OP-TEK® Flex
Comfort
Dimensions:
16 in x 16 in – 48 in x 96 in
Thickness:
0.187 in – 0.500 in
OP-TEK® Flex BiLam Dimensions:
12 in x 12 in – 48 in x 96 in
Thickness:
0.500 in
Orfitrans Excel Dimensions:
12 in x 12 in – 48 in x 48 in
Thickness:
10 mm – 15 mm
Proflex Dimensions:
12 in x 12 in – 48 in x 96 in
Thickness:
0.187 in – 0.500 in
Proflex with
Silicone
Dimensions:
12 in x 12 in – 48 in x 96 in
Thickness:
0.125 in – 0.625 in
OPTIONS AVAILABLE
COLOR Sheet:
Black, Natural, White
Texture, Surface, Pattern Smooth
GRADES Orthotic Grade

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

 

FLEXIBLE (EVA) MATERIAL OPTIONS - OP-TEK® Flex, Proflex, Orfitrans™ Excel

OP-TEK® Flex– is a soft, flexible EVA copolymer that provides for outstanding patient comfort when used as a liner for rigid socket frames. OP-TEK® Flex is specially formulated to maintain more consistent walls during forming compared with many other flexible plastics.

OP-TEK® Flex Comfort– is a soft, flexible EVA copolymer with a proprietary additive that gives the material a softer feel. This enhanced surface provides superior patient comfort when used as a liner for rigid socket frames. The additive greatly reduces friction when patients don and doff prosthetic devices. Unlike EVAs with silicone, OP-TEK® Flex Comfort exhibits excellent seaming characteristics during drape forming and more consistent walls during blister/bubble forming compared with many other EVA copolymer materials.

OP-TEK® Flex BiLam– provides added comfort and improves aesthetics for patients wearing carbon socket frames. The inner layer contains a hypoallergenic, FDA compliant additive that reduces friction, and the outer layer helps hide trim lines and window cut-outs of carbon socket frames.

Proflex– is a soft, flexible EVA copolymer that provides a superior level of patient comfort when used as a liner for rigid socket frames. 

Orfitrans™ Excel– is available in semi-transparent and black. The material pulls very easily and offers outstanding comfort for the patient.

Proflex with Silicone (Proflex-S)– is a soft, flexible EVA copolymer with a silicone lubricant. Like Proflex it provides a superior level of patient comfort when used as a liner for rigid socket frames. The silicone reduces friction when patients don and doff prosthetic devices.

Tech Tip– Be aware that certain solvents can cause cracks to propagate with EVA materials.

 

Typical Properties of EVA Copolymer Sheet
PHYSICAL PROPERTIES UNITS ASTM TEST EVA SHEET
Density g/cm3 D1505 0.952
Tensile strength @ yield psi D638 3580
Elongation @ break % D638 770
Flexural modulus psi D790 2470
Impact brittleness temp °F D746 <-121
DTUL A Scale D648 79A
Vicat softening point °F D1525 111

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

Need more information about this material? Use our interactive plastic properties table