OP-TEK® Flex BiLam

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 OP-TEK Flex BiLam Inner Linertoughness, 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.)

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.


Typical Properties of EVA Copolymer 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