Frequently Asked Questions Is the Philips Avent Comfort breast pump BPA free? All Philips Avent products are 100% BPA-free. And some parts are made of silicone. Find out what materials were used for your Philips Avent breast pump. Polypropylene and silicone The cover of the Philips Avent breast pump is made from polypropylene (PP), and the massage cushion, white valve and diaphragm consist of silicone Manual breast pump For the manual breast pump, the handle and stem are also made of polypropylene. Electric breast pump For the electric breast pump, the pump body is made of polypropylene and the tube and cap are made of silicone.