Squeegee materials are typically made of polyurethane, which is highly resistant to harsh chemicals found in screen printing ink. After flooding the ink over the screen image, the squeegee presses the ink through the image and onto the product by applying pressure to the squeegee. Squeegee material comes in different hardness levels, also known as durometer ratings. In the screen printing industry, durometers range from 60 to 90 with 90 being the hardest. The most commonly used squeegee for graphic printing material is 70 durometer.