ASTM F2808-17 + Redline

1.1 The Behind-the-Knee (BTK) method, using the popliteal fossa of human volunteers as a test site, simultaneously evaluates the inherent chemical irritation, and the potential for mechanical irritation of substrates and products that are designed to come into repeated or extended close contact with the skin (see validation references 1-7).2 This is a bilateral test comparing a test material to a reference material with a known safety profile.