Tygon S3 E-3603 is now phthalate-free. The bio-based Tygon S3 line combines the high performance standards customers demand with an eco-friendly tubing design. Crystal clear and flexible, long-lasting and crack-resistant, the new Tygon S3 E-3603 non-Dehp tubing delivers the same superior performance you have come to expect, but now in a formulation that contains a non-DEHP plasticizer